CN109801831B - Thin GEM detector used as digital hadron energy meter and assembling method thereof - Google Patents
Thin GEM detector used as digital hadron energy meter and assembling method thereof Download PDFInfo
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- CN109801831B CN109801831B CN201910042895.8A CN201910042895A CN109801831B CN 109801831 B CN109801831 B CN 109801831B CN 201910042895 A CN201910042895 A CN 201910042895A CN 109801831 B CN109801831 B CN 109801831B
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Abstract
The utility model provides a thin GEM detector for being digital hadron energy meter includes: a support plate; the outer frame is fixed on the supporting plate, the reading plate is fixed on the outer frame, and the supporting plate, the outer frame and the reading plate form an airtight cavity; a drift region film laid on the support plate; the first GEM film and the second GEM film are arranged in the airtight cavity in a laminated mode; and the film stretching assembly is fixed in the airtight cavity, is connected with the peripheries of the first GEM film and the second GEM film, and stretches the first GEM film and the second GEM film along a direction parallel to the supporting plate.
Description
Technical Field
The disclosure relates to the field of digital hadron energy measuring devices, in particular to a thin GEM detector and an assembling method thereof.
Background
The collider experiment is the most effective means for exploring the micro world for a long time and is an extremely important way for developing particle physical research. Reviewing the history, the development and breakthrough of particle physics are closely related to the continuous progress and revolution of the collider experiment technology, and the particle physics standard model which is one of the most important achievements of the physics in the twentieth century is built on the basis of a large number of collider experiment results. The mission of particle physics in this new era is to find new physics beyond the standard model to answer and solve a series of basic questions that plague us, including: the nature and nature of the sigma particles, level differences and naturalness issues, mesoparticle mass and type, origin of positive and negative material asymmetries, nature of dark material and dark energy, how uniform the attractive forces and other interactions are, etc. As a strong driver for particle physics development, the collider experiment will continue to play an important role in particle physics exploration in a new era, and play a key role. The method is in compliance with the development trend of particle physics, the collider experiment shows a situation of deep propulsion in the directions of high energy and high brightness, and the aim is to directly discover a new physical phenomenon in a higher energy area or indirectly find a new physical sign through accurate measurement of electricity weakness, so that a new breakthrough of particle physics is realized.
As the collider is continuously pushed in the high energy and high brightness direction, the physical performance of the collider experiment is more and more strongly dependent on the performance of the detector, and the working environment of the detector is also more severe, which all pose serious challenges to the next generation of detector technology. Among the performance requirements for next generation detectors, one of the very challenging ones is the energy resolution of hadron injection. Under the influence of the huge fluctuation of the hadron cluster, the traditional energy measurer has no great improvement space on the jet energy resolution, and in order to obtain the approximate energy
The jet energy resolution of (2) is necessary to develop a new generation of energy meter technology, the concept of particle flow algorithm is introduced accordingly, and imaging type energy meters are also produced. A key factor affecting the performance of an imaging-type dosimeter is the confusion between the different particle energy deposits in the jet, which is largely determined by the granularity of the dosimeter, in contrast to which the intrinsic energy resolution of the dosimeter is not particularly important. Therefore, the imaging type energy meter must be of a sampling type, including an absorber and a sensitive detector, consisting of respective overlapping absorbing and sensitive layers.
It is worth pointing out that imaging-type energy meters with high granularity are not only needed to improve the jet energy resolution, but also to cope with the extreme experimental conditions on future high-energy colliders: on the colliders, the multiple number of the last-state reaction injection is very high, meanwhile, a plurality of injections are possibly pushed by the same source, the injections are close to each other or partially overlapped, and the effective reconstruction of the injection can be realized only by a high-granularity energy meter under the condition; different injections can be combined into an fat injection, which is also a signal characteristic of a plurality of new physics, and the internal structure of the fat injection can be identified by the high-granularity energy meter, so that the background is effectively reduced, and the sensitivity for detecting the new physical signal is obviously improved; the stacking effect on the hadron collider is a dominant factor influencing the injection measurement, and the stacking effect can be effectively reduced by using a high-granularity energy meter and combining a track detector, utilizing the shower characteristics, applying the isolation requirement and the like.
In summary, the imaging type energy meter is a novel energy meter with the concept of 'track detection', can track details of high-energy shower development, can remarkably improve the jetting measurement performance through a particle flow algorithm, meets high requirements of future collider experiments, has a great application prospect, and becomes an important development direction of the next-generation energy meter technology. The digital hadron energy meter is an important scheme of an imaging type hadron energy meter, has the characteristics of simplicity in reading, good uniformity and stability and the like, and has important significance for future development of particle physics experiments by developing a digital hadron energy meter technology. The core component of the digital hadron energy meter is a sensitive detector, and the thin GEM detector with the structure of 3mm-1mm-1mm is very suitable for being used as the sensitive detector of the digital hadron energy meter and can meet various requirements of the digital hadron energy meter. The invention provides a design, installation and manufacturing method of a thin GEM detector with a 3mm-1mm-1mm structure, which can be used as a digital energy measurer, and belongs to the key detector technology for the experimental development and storage of a next generation of colliders.
For a large-area GEM detector with a common structure of 3mm-2mm-2mm-2mm, a solid outer frame is usually fixed on a bottom support frame, then a drift electrode and three layers of GEM films which are fixed by inner backing strips are put into the frame, and then the films are tensioned by screws on the side faces, so that the purpose of tensioning is achieved. The method comprises the following three steps of 1) fixing three films in the vertical direction by using small padding strips. The middle part of the filler strip is provided with a forward protruding part for providing support for the sliding block. The slide block is fixed on the filler strip by using two stainless steel columns fixed on the stainless steel bottom plate, so that the slide block can only move in the horizontal direction. 2) A firm outer frame is fixed on the detector supporting plate, then a screw penetrating through the outer frame is connected with a sliding block in the middle of the filler strip, and the sliding block is tensioned outwards by rotating the screw. Because the screws attached to the slides are always perpendicular to the frame, only the GEM film and the inner backing strip are actually moved. 3) And installing a rubber O-shaped ring, a reading electrode and the like to finish the installation of the whole detector. Since the screws are always able to apply sufficient tension to the membrane, there is no need for a support frame support inside the membrane. In addition, the large-area GEM detector manufactured by the sliding type self-tensioning method can be repeatedly disassembled, and any part of the detector can be replaced.
The above described compaction method is well suited for use in fabricating large area thick GEM detectors of the "3 mm-2mm-2mm-2 mm" configuration. However, for a thin large-area GEM detector with a structure of 3mm-1mm-1mm, which is used as a digital hadron energy meter, since the whole thickness of the detector is reduced by 4mm, the processing difficulty is greatly increased due to the reduction of the size when the filler strip and the sliding block are processed, so that the yield is very low, and the manufacturing cost of manufacturing a meter-level thin large-area GEM detector becomes unbearable. And because the thickness of the outer frame becomes small, a screw cannot penetrate through the outer frame to be connected with the sliding block while the detector has good air tightness, so that the whole sliding type self-tensioning technical scheme is not applicable to a thin large-area GEM detector which is used as a digital type hadron energy meter and has a structure of 3mm-1mm-1mm, and a new scheme is required.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
Technical problem to be solved
To at least partially solve the above technical problem, the present disclosure provides a thin GEM detector and an assembling method thereof.
(II) technical scheme
The utility model provides a thin GEM detector for being digital hadron energy meter includes: a support plate; the outer frame is fixed on the supporting plate, the reading plate is fixed on the outer frame, and the supporting plate, the outer frame and the reading plate form an airtight cavity; a drift region film laid on the support plate; the first GEM film and the second GEM film are arranged in the airtight cavity in a laminated mode; and the film stretching assembly is fixed in the airtight cavity, is connected with the peripheries of the first GEM film and the second GEM film, and stretches the first GEM film and the second GEM film along a direction parallel to the supporting plate.
In some embodiments of the present disclosure, a set of first fixing holes, a plurality of sets of supporting holes and a plurality of sets of positioning holes are respectively formed around the supporting plate from outside to inside.
In some embodiments of the present disclosure, the outer frame is circumferentially provided with a set of second fixing holes, the second fixing holes are opposite to the first fixing holes, and screws are inserted into the first fixing holes and the second fixing holes to fix the outer frame on the support plate; the front side and the back side of the outer frame are provided with annular sealing grooves, and the annular sealing grooves are positioned on the inner side of the second fixing hole and are provided with rubber O-shaped rings; the outer frame is provided with a group of protruding structures along the circumferential direction, and the protruding structures are located on the inner side of the environment sealing groove and provided with first through holes for supporting the spring ejector pins; the outer frame is provided with two threaded counter bores, the threaded counter bores extend in the direction parallel to the supporting plate, the bottom of the threaded counter bores is provided with a second through hole, the second through hole is located between the annular sealing grooves on the front side and the back side of the outer frame, and the threaded counter bores are used for installing an air faucet.
In some embodiments of the present disclosure, the readout board 1 is mounted with an input connector for inputting an operating voltage.
In some embodiments of the present disclosure, the straining assemblies include a plurality of first straining assemblies and a plurality of second straining assemblies, the first straining assemblies being positioned to correspond to the operating voltage input regions of both the first GEM film and the second GEM film, the second straining assemblies being positioned to correspond to the non-operating voltage input regions of both the first GEM film and the second GEM film, the first straining assemblies including: a first drift region pad strip, a first transmission region pad strip and a guide region pad strip, the second film stretching assembly comprising: a second drift region pad strip, a second transfer region pad strip, and a guide region pad strip.
In some embodiments of the present disclosure, the first drift region pad strip is provided with a stepped hole along the length direction thereof for fixing a copper nut; a second through hole and a first notch are formed between every two adjacent stepped holes, a spring thimble penetrates through the second through hole, a square nut is placed in the first notch, and a positioning hole is formed in the first drift region filler strip and used for positioning the first drift region filler strip.
In some embodiments of the present disclosure, the first transmission region pad strip is provided with a third through hole along the length direction thereof for passing a screw; and a fourth through hole and a second notch are formed between every two adjacent third through holes, the fourth through hole is used for the spring thimble to pass through, a square nut is placed in the second notch, and the first transmission area filler strip is provided with a positioning hole for positioning the first transmission area filler strip.
In some embodiments of the present disclosure, the guiding region filler strip is provided with tapered holes along a length direction thereof for allowing a flat head screw to pass through and press the guiding region filler strip, a third notch is formed between two middle tapered holes, the third notch is used for placing a square nut 30, and the guiding region filler strip is provided with positioning holes for positioning the guiding region filler strip.
In some embodiments of the present disclosure, a stainless steel column is fixed in the support hole of the support plate; the first drift region pad strip, the second transmission region pad strip and the guide region pad strip are laminated together, the first drift region pad strip and the second transmission region pad strip clamp the periphery of a first GEM film, the second transmission region pad strip and the guide region pad strip clamp the periphery of a second GEM film, the spring ejector pin penetrates through the second through hole and the fourth through hole, the flat head screw penetrates through the tapered hole and the third through hole, the copper nut in the stepped hole screws the flat head screw, so that the first film tightening assembly clamps the first GEM film and the second GEM film, the first notch, the second notch and the third notch are opposite in position, the square nut is arranged in a space formed by the first notch, the second notch and the third notch, the film tightening screw sequentially penetrates through the sliding strip and the square nut, and the sliding strip is clamped outside the stainless steel column.
The present disclosure also provides a method for assembling a thin GEM detector used as a digital hadron energy meter, comprising: step 1: laying a drift region film on a support plate, and inserting a positioning needle into a positioning hole of the support plate; step 2: embedding copper nuts into the first drift region pad strip and the second drift region pad strip, positioning the positioning holes of the first drift region pad strip and the second drift region pad strip by using positioning pins, and enabling spring ejector pins to penetrate through the second through holes of the first drift region pad strip; and step 3: positioning a positioning hole of the first GEM film, positioning holes of a first transmission area filler strip and a second transmission area filler strip, positioning holes of the second GEM film and positioning holes of a guide area filler strip by using a positioning pin in sequence, wherein a spring thimble penetrates through a fourth through hole of the first transmission area filler strip, a square nut is placed into a space formed by a first notch, a second notch and a third notch, a flat head screw penetrates through a conical hole of the guide area filler strip, a third through hole of the first transmission area filler strip and is screwed with a copper nut, so that the first GEM film and the second GEM film are clamped by the first film tightening assembly, and the flat head screw penetrates through the conical hole of the guide area filler strip, the third through hole of the second transmission area filler strip and the copper nut, so that the first GEM film and the second GEM film are clamped by the second film tightening assembly; and 4, step 4: fixing a stainless steel column in a support hole of the support plate, sequentially penetrating a film tightening screw through a sliding strip and a square nut, clamping the sliding strip on the outer side of the stainless steel column, pulling out a positioning needle, and adjusting the film tightening screw to tighten the first GEM film and the second GEM film; and 5: rubber O-shaped rings are placed in the annular sealing grooves in the reverse side of the outer frame, the outer frame is placed on the supporting plate, the spring ejector pins are supported by the first through holes of the protruding structure of the outer frame, the rubber O-shaped rings are placed in the annular sealing grooves in the front side of the outer frame, then the reading plate is fixed on the outer frame, and finally the input connector is installed.
(III) advantageous effects
According to the technical scheme, the method has the following beneficial effects:
(1) the detector manufactured by the method completely inherits all advantages of the sliding type self-tensioning method, not only can the detectors with different sizes be designed according to application requirements, but also all parts of the detector can be detached and replaced, and the manufacturing and maintenance cost of the detector can be effectively reduced. Meanwhile, the GEM film can be uniformly stressed due to the movement of the sliding block, so that the performances of the detector have better uniformity in the whole effective area.
(2) The mounting complexity is effectively reduced, and meanwhile, the assembly precision of parts is also improved. The positioning holes in the supporting plate absorber are used for realizing accurate positioning in the manufacturing process of the detector, so that the difficulty in mounting a series of detectors caused by inaccurate positioning in the mounting process of the detector is avoided.
(3) The difficulty of processing parts is greatly reduced. For the manufacture of a thin large-area GEM detector with a structure of 3mm-1mm-1mm used as a digital hadron energy meter, the height of the inner space of the detector is only 5mm, if the detector part is processed according to the original sliding self-tensioning scheme, the high rejection rate can be caused, the precision of the processed part is greatly reduced, the cost of the detector is unacceptable, and the performance of the detector is greatly reduced. The invention provides a method for mounting and manufacturing a thin large-area GEM detector which is specially used as a digital type energy intensifier and has a structure of 3mm-1mm-1mm, and the problems are effectively avoided.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a thin GEM detector according to an embodiment of the present disclosure.
Fig. 2 (a) and (b) are schematic structural diagrams of a straight edge and a corner of the outer frame of the embodiment of the present disclosure, respectively.
Fig. 3 (a) and (b) are schematic front and back structures of a first drift region pad strip according to an embodiment of the disclosure.
Fig. 4 is a schematic structural diagram of a first transmission area filler strip according to an embodiment of the disclosure.
Fig. 5 (a) and (b) are schematic front and back structures of the guide area pad strip according to the embodiment of the disclosure.
Fig. 6 (a) and (b) are schematic structural diagrams of the first stretch film assembly of the embodiment of the present disclosure before and after assembly, respectively.
Fig. 7 (a) and (b) are respectively a partial and overall structural schematic diagram of the thin GEM detector according to the embodiment of the disclosure.
Fig. 8 is a flowchart of an assembly method of a thin GEM detector according to an embodiment of the disclosure.
[ notation ] to show
1-reading plate; 2-outer frame; 3-a support plate; 4-stretching the membrane assembly; 5-a drift region film; 6-first GEM film; 7-a second GEM film; 8-a first fixation hole; 9-a second fixing hole; 10-a first via; 11-an annular seal groove; 12-a threaded counter bore; 13-input connector; 14-first drift region pad bar; 15-a first transfer area filler strip; 16-a guide area backing strip; 17-a groove; 18-a second through-hole; 19-a first notch; 20-positioning holes; 21-a third via; 22-a fourth via; 23-a second notch; 24-a tapered hole; 25-a third notch; 26-copper nuts; 27-grub screws; 28-film stretching screws; 29-a slide bar; 30-square nut; 31-a protruding structure; 32-a stepped bore; 33-stainless steel column.
Detailed Description
The invention provides a large-area GEM detector manufacturing method which completely inherits all the advantages of a sliding type self-tensioning method and overcomes the problems of the sliding type self-tensioning method in manufacturing a thin GEM detector with a 3mm-1mm-1mm structure.
the key technology of the disclosure is that when a thin large-area GEM detector with a structure of 3mm-1mm-1mm used as a digital energy intensifier is manufactured, two GEM films are fixed by using an inner pad strip, and a sliding block capable of moving relative to a supporting column is used for applying tension to the inner pad strip, so that when the GEM films are subjected to tension, the externally applied tension can be uniformly transmitted to each position inside the films through the movement of the sliding block, thereby improving the uniformity of each performance of the detector.
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the embodiments and the drawings in the embodiments. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The disclosed embodiment provides a thin GEM detector, as shown in fig. 1, including: a support plate 3, a drift region membrane 5, a first GEM film 6, a second GEM film 7, a readout plate 1, a housing 2 and a film-stretching assembly 4.
The outer frame 2 is fixed on the support plate 3, the reading plate 1 is fixed on the outer frame 2, and the support plate 3, the outer frame 2 and the reading plate 1 form an airtight cavity. The drift region film 5 is laid on the support plate 3. A first GEM film 6 and a second GEM film 7 are arranged in layers within the airtight cavity. A film stretching assembly 4 is fixed in the airtight cavity, connecting the peripheries of the first GEM film 6 and the second GEM film 7, so as to stretch the first GEM film 6 and the second GEM film 7 in a direction parallel to the support plate 3. The individual components are described in detail below.
The support plate 3 acts as an absorber to provide support for the thin GEM detector and may be of stainless steel. A group of first fixing holes 8, a plurality of groups of supporting holes and a plurality of groups of positioning holes are formed in the periphery of the supporting plate 3 from outside to inside respectively, each group of supporting holes comprises two supporting holes, and each group of positioning holes comprises two positioning holes.
The outer frame 2 has a ring shape, and in one example, as shown in fig. 2 (a) and (b), the outer frame 2 is a rectangular frame, and a set of second fixing holes 9 are formed along the circumferential direction, the second fixing holes 9 are opposite to the first fixing holes 8, and the outer frame 2 is fixed to the support plate 3 by screws penetrating the first fixing holes 8 and the second fixing holes 9. The front and back of the outer frame 2 are provided with annular sealing grooves 11, and the annular sealing grooves 11 are positioned at the inner sides of the second fixing holes 9. Rubber O-shaped rings are placed in the annular sealing groove 11 and used for guaranteeing the contact position of the outer frame 2 and the supporting plate 3 and the air tightness of the contact position of the outer frame 2 and the supporting plate 3. The outer frame 2 further has a set of protruding structures 31 along the circumferential direction, the protruding structures 31 are located inside the environmental sealing groove, the protruding structures 31 are provided with first through holes 10 for supporting spring pins, and the spring pins transmit high voltage from the supporting plate 3 to the inside of the detector. The outer frame 2 is also provided with two threaded counterbores 12, the threaded counterbores 12 extending in a direction parallel to the support plate 3. The bottom of the threaded counter bore 12 is provided with a second through hole 18 with the diameter of 1mm, and the second through hole 18 is positioned between the annular sealing grooves 11 on the front surface and the back surface of the outer frame 2. The threaded counter bore 12 is used to mount an air tap which is used as an air inlet and an air outlet of the detector, respectively.
The reading plate 1 is fixed on the outer frame 2, and forms an airtight cavity together with the support plate 3 and the outer frame 2. The readout board 1 is also equipped with an input connector 13 for inputting an operating voltage.
The film stretching assembly 4 comprises a plurality of first film stretching assemblies and a plurality of second film stretching assemblies. The position of the first toggling assembly corresponds to the operating voltage input regions of both the first GEM film 6 and the second GEM film 7, and the position of the second toggling assembly corresponds to the non-operating voltage input regions of both the first GEM film 6 and the second GEM film 7.
The first film stretching assembly comprises: a first drift region pad strip 14, a first transfer region pad strip 15 and a guide region pad strip 16. As shown in fig. 3 (a), (b), the first drift region pad strip 14 is a long strip, and the side surface of the first drift region pad strip facing away from the first GEM film 6 and the second GEM film 7 is recessed inwards to form a groove 17. The first drift region pad strip 14 is provided with four stepped holes 32 along the length direction thereof for fixing the threaded copper nuts 26. Two second through holes 18 and a first notch 19 are formed between two adjacent stepped holes 32. The second through hole 18 is penetrated by a pogo pin for transmitting the operating voltage. The first notch 19 houses a square nut 30. Positioning holes 20 are formed in two sides of the groove 17 of the first drift region pad strip 14 and used for positioning the first drift region pad strip 14. The first drift region pad strips 14 are 3mm thick, as are the drift region air gaps.
As shown in fig. 4, the first transmission region filler strip 15 is a strip shape, and the side surface of the first transmission region filler strip facing away from the first GEM film 6 and the second GEM film 7 is recessed inwards to form a groove 17. The first transmission region filler strip 15 is provided with four third through holes 21 along the length direction thereof for passing screws for fixing the first transmission region filler strip 15. Two fourth through holes 22 and a second notch 23 are formed between two adjacent third through holes 21. The fourth through hole 22 is penetrated by a pogo pin for transmitting the operating voltage. The second notch 23 houses a square nut 30. Positioning holes 20 are formed in two sides of the groove 17 of the first transmission area filler strip 15 and used for positioning the first transmission area filler strip 15. The first transfer area furring strips 15 are 1mm thick, the same as the transfer area air gap.
As shown in fig. 5 (a), (b), the guide region filler strip 16 is in the shape of a long strip, and the side surface thereof facing away from the first GEM film 6 and the second GEM film 7 is recessed inward to form a groove 17. The guidance area filler strip 16 is provided with four 90 ° pyramidal holes 24 along its length for the flat head screws 27 to pass through and press against the guidance area filler strip 16. A third notch 25 is formed between the middle two tapered holes 24. The third notch 25 receives a square nut 30. Positioning holes 20 are formed in two sides of the groove 17 of the guide area filler strip 16 and used for positioning the guide area filler strip 16. The guide area shim bars 16 are 1mm thick, as are the guide area air gaps.
As shown in fig. 6 (a), (b), stainless steel columns 33 are fixed to each set of two support holes of the support plate 3. The first drift region furrows 14, the second transfer region furrows and the guide region furrows 16 are laminated together, the first drift region furrows 14 and the second transfer region furrows sandwich the periphery of the first GEM film 6, and the second transfer region furrows and the guide region furrows 16 sandwich the periphery of the second GEM film 7. The pogo pins pass through the second through holes 18 of the first drift region shim bars 14 and the fourth through holes 22 of the first transfer region shim bars 15. The grub screw 27 passes through the tapered hole 24 of the leading region filler strip 16, the third through hole 21 of the first transfer region filler strip 15. The copper nuts 26 in the stepped holes 32 of the first drift region pad strip 14 tighten the grub screws 27 so that the first film stretching assembly clamps the first GEM film 6 and the second GEM film 7. The first notch 19 of the first drift region pad strip 14, the second notch 23 of the second transfer region pad strip and the third notch 25 of the guide region pad strip 16 are located opposite. The square nut 30 is placed in a space formed by the first notch 19, the second notch 23, and the third notch 25. The film stretching screw 28 sequentially passes through the slide bar 29 and the square nut 30, and the slide bar 29 is clamped outside the two stainless steel columns 33.
The second film stretching assembly comprises: second drift region padding strips, second transfer region padding strips and guide region padding strips 16. Their structures are identical to the first drift region, first transfer region and guide region strips 14, 15 and 16, respectively, of the first film stretching assembly, with the only difference that the second drift region strip does not have the second through-hole 18 and the second transfer region strip does not have the fourth through-hole 22.
By adjusting the film stretching screws 28, the first plurality of film stretching assemblies and the second plurality of film stretching assemblies stretch the first GEM film 6 and the second GEM film 7 from all around in a direction parallel to the support plate 3.
Another embodiment of the present disclosure further provides an assembling method of a thin GEM detector, including:
step 1: the drift region film 5 is laid on the support plate 3, and a positioning pin is inserted into a positioning hole of the support plate 3.
Step 2: the copper nuts 26 are embedded in the first drift region pad strip 14 and the second drift region pad strip, the positioning holes 20 of the first drift region pad strip 14 and the second drift region pad strip are positioned by the positioning pins, and the spring ejector pins penetrate through the second through holes 18 of the first drift region pad strip 14.
And step 3: the positioning holes 20 of the first GEM film 6, the positioning holes 20 of the first transmission area backing strip 15 and the second transmission area backing strip, the positioning holes 20 of the second GEM film 7 and the positioning holes 20 of the guide area backing strip 16 are sequentially positioned by using positioning pins, a spring thimble penetrates through a fourth through hole 22 of the first transmission area backing strip 15, a square nut 30 is placed in a space formed by a first notch 19, a second notch 23 and a third notch 25, a flat head screw 27 penetrates through a tapered hole 24 of the guide area backing strip 16, a third through hole 21 of the first transmission area backing strip 15 and is screwed with a copper nut 26, so that the first GEM film 6 and the second GEM film 7 are clamped by the first stretching film assembly, and the flat head screw 27 penetrates through the tapered hole 24 of the guide area backing strip 16, the third through hole 21 of the second screwing transmission area backing strip and the copper nut 26, so that the first GEM film 6 and the second GEM film 7 are clamped by the second stretching film assembly.
And 4, step 4: and a stainless steel column 33 is fixed in a support hole of the support plate 3, the film tightening screw 28 sequentially penetrates through the sliding strip 29 and the square nut 30, the sliding strip 29 is clamped on the outer side of the stainless steel column 33, the positioning needle is pulled out, and the film tightening screw 28 is adjusted to tighten the first GEM film 6 and the second GEM film 7.
And 5: the rubber O-ring is placed in the annular sealing groove 11 on the reverse side of the outer frame 2, the outer frame 2 is placed on the support plate 3, the spring thimble is supported by the first through hole 10 of the outer frame protrusion structure 31, the rubber O-ring is placed in the annular sealing groove 11 on the front side of the outer frame 2, then the reading plate 1 is fixed on the outer frame 2, and finally the input connector 13 is installed, as shown in (a) and (b) of fig. 7.
The present disclosure is applicable to thin large area GEM detectors with a "3 mm-1mm-1 mm" structure for use as digital hadron energy devices. The detector manufactured by the method completely inherits all advantages of the sliding type self-tensioning method, not only can the detectors with different sizes be designed according to application requirements, but also all parts of the detector can be detached and replaced, and the manufacturing and maintenance cost of the detector can be effectively reduced. Meanwhile, the GEM film can be uniformly stressed due to the movement of the sliding block, so that the performances of the detector have better uniformity in the whole effective area. The mounting complexity is effectively reduced, and meanwhile, the assembly precision of parts is also improved. The positioning holes in the supporting plate absorber are used for realizing accurate positioning in the manufacturing process of the detector, so that the difficulty in mounting a series of detectors caused by inaccurate positioning in the mounting process of the detector is avoided. The difficulty of processing parts is greatly reduced. For the manufacture of a thin large-area GEM detector with a structure of 3mm-1mm-1mm used as a digital hadron energy meter, the height of the inner space of the detector is only 5mm, if the detector part is processed according to the original sliding self-tensioning scheme, the high rejection rate can be caused, the precision of the processed part is greatly reduced, the cost of the detector is unacceptable, and the performance of the detector is greatly reduced. The invention provides a method for mounting and manufacturing a thin large-area GEM detector which is specially used as a digital type energy intensifier and has a structure of 3mm-1mm-1mm, and the problems are effectively avoided.
The present disclosure has been described in detail so far with reference to the accompanying drawings. From the above description, those skilled in the art should clearly recognize the present disclosure.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. In addition, the above definitions of the various elements are not limited to the specific structures, shapes or modes mentioned in the embodiments, and those skilled in the art may easily modify or replace them, for example:
(1) directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the orientation of the drawings and are not intended to limit the scope of the present disclosure;
(2) the embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e. technical features in different embodiments may be freely combined to form further embodiments.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (6)
1. A thin GEM detector for use as a digital hadron, comprising:
a support plate;
an outer frame fixed on the supporting plate,
the reading plate is fixed on the outer frame, and the supporting plate, the outer frame and the reading plate form an airtight cavity;
a drift region film laid on the support plate;
the first GEM film and the second GEM film are arranged in the airtight cavity in a laminated mode;
the film stretching assembly is fixed in the airtight cavity, is connected with the peripheries of the first GEM film and the second GEM film, and stretches the first GEM film and the second GEM film in a direction parallel to the supporting plate;
a group of first fixing holes, a plurality of groups of supporting holes and a plurality of groups of positioning holes are respectively formed in the periphery of the supporting plate from outside to inside;
the outer frame is provided with a group of second fixing holes along the circumferential direction, the second fixing holes are opposite to the first fixing holes in position, and the outer frame is fixed on the support plate by penetrating screws into the first fixing holes and the second fixing holes;
the front side and the back side of the outer frame are provided with annular sealing grooves, and the annular sealing grooves are positioned on the inner side of the second fixing hole and are provided with rubber O-shaped rings;
the outer frame is provided with a group of protruding structures along the circumferential direction, and the protruding structures are located on the inner side of the annular sealing groove and provided with first through holes for supporting the spring ejector pins;
the outer frame is provided with two threaded counter bores, the threaded counter bores extend in a direction parallel to the support plate, the bottom of the threaded counter bores is provided with second through holes, the second through holes are located between the annular seal grooves on the front side and the back side of the outer frame, and the threaded counter bores are used for installing air nozzles;
the film stretching assembly comprises a plurality of first film stretching assemblies and a plurality of second film stretching assemblies, the position of the first film stretching assembly corresponds to the working voltage input areas of the first GEM film and the second GEM film, the position of the second film stretching assembly corresponds to the non-working voltage input areas of the first GEM film and the second GEM film, and the first film stretching assembly comprises: a first drift region pad strip, a first transmission region pad strip and a guide region pad strip, the second film stretching assembly comprising: a second drift region pad strip, a second transmission region pad strip and a guide region pad strip;
the first drift region pad strip is provided with stepped holes along the length direction, a second through hole and a first notch are formed between every two adjacent stepped holes, and the first drift region pad strip is provided with a positioning hole;
the first transmission area filler strip is provided with third through holes along the length direction, a fourth through hole and a second notch are formed between every two adjacent third through holes, and the first transmission area filler strip is provided with positioning holes;
the guide area pad strip of the first film stretching assembly and the guide area pad strip of the second film stretching assembly are both provided with tapered holes along the length direction, third notches are arranged between the two middle tapered holes, and positioning holes are arranged on the third notches;
stainless steel columns are fixed in the supporting holes of the supporting plates; the first drift region pad strip, the first transmission region pad strip and the guide region pad strip of the first film tightening assembly are laminated together, the first drift region pad strip and the first transmission region pad strip clamp the periphery of a first GEM film, the first transmission region pad strip and the guide region pad strip of the first film tightening assembly clamp the periphery of a second GEM film, a spring thimble penetrates through a second through hole and a fourth through hole, a flat head screw penetrates through a conical hole and a third through hole, a copper nut in the stepped hole is screwed with the flat head screw, the first film tightening assembly clamps the first GEM film and the second GEM film, the first notch, the second notch and the third notch are opposite in position, a square nut is arranged in a space formed by the first notch, the second notch and the third notch, the film tightening screw penetrates through a sliding strip and the square nut in sequence, and the sliding strip is clamped outside a stainless steel column;
the second drift region pad strip is not provided with a second through hole, and the rest structure is the same as that of the first drift region pad strip; the second transmission area filler strip is not provided with a fourth through hole, and the rest structure is the same as that of the first transmission area filler strip; the guide area mattress strip of the second film stretching assembly has the same structure as the guide area mattress strip of the first film stretching assembly.
2. The thin GEM detector for use as a digital hadron as claimed in claim 1 wherein the readout board is fitted with input connectors for inputting operating voltages.
3. The thin GEM detector as a digital hadron energy device of claim 1 wherein the stepped holes are used to secure copper nuts; the second through hole of the first drift region backing strip is used for a spring thimble to pass through, the square nut is placed in the first notch, and the positioning hole of the first drift region backing strip is used for positioning the first drift region backing strip.
4. The thin GEM detector as a digital hadron energy device of claim 1 wherein the third through hole is used for passing a screw; the fourth through hole is used for a spring thimble to pass through, the square nut is placed in the second notch, and the positioning hole of the first transmission area filler strip is used for positioning the first transmission area filler strip.
5. The thin GEM detector as a digital hadron energy meter as claimed in claim 1, wherein the tapered hole is used for allowing a flat head screw to pass through and press the guiding region pad strip, the third slot is used for placing a square nut, and the positioning hole of the guiding region pad strip is used for positioning the guiding region pad strip.
6. A method of assembling a thin GEM detector for use as a digital hadron as in claim 1 comprising:
step 1: laying a drift region film on a support plate, and inserting a positioning needle into a positioning hole of the support plate;
step 2: embedding copper nuts into the first drift region pad strip and the second drift region pad strip, positioning the positioning holes of the first drift region pad strip and the second drift region pad strip by using positioning pins, and enabling spring ejector pins to penetrate through the second through holes of the first drift region pad strip;
and step 3: positioning a positioning hole of the first GEM film, positioning holes of a first transmission area filler strip and a second transmission area filler strip, positioning holes of the second GEM film and positioning holes of a guide area filler strip by using a positioning pin in sequence, wherein a spring thimble penetrates through a fourth through hole of the first transmission area filler strip, a square nut is placed into a space formed by a first notch, a second notch and a third notch, a flat head screw penetrates through a conical hole of the guide area filler strip, a third through hole of the first transmission area filler strip and is screwed with a copper nut, so that the first GEM film and the second GEM film are clamped by the first film tightening assembly, and the flat head screw penetrates through the conical hole of the guide area filler strip, the third through hole of the second transmission area filler strip and the copper nut, so that the first GEM film and the second GEM film are clamped by the second film tightening assembly;
and 4, step 4: fixing a stainless steel column in a support hole of the support plate, sequentially penetrating a film tightening screw through a sliding strip and a square nut, clamping the sliding strip on the outer side of the stainless steel column, pulling out a positioning needle, and adjusting the film tightening screw to tighten the first GEM film and the second GEM film;
and 5: rubber O-shaped rings are placed in annular sealing grooves in the reverse side of the outer frame, the outer frame is placed on the supporting plate, the spring ejector pins are supported by the first through holes of the protruding structure of the outer frame, the rubber O-shaped rings are placed in annular sealing grooves in the front side of the outer frame, the reading plate is fixed on the outer frame, and finally the input connector is installed.
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