CN206975229U - A kind of MCP neutron detectors based on polyethylene - Google Patents
A kind of MCP neutron detectors based on polyethylene Download PDFInfo
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- CN206975229U CN206975229U CN201720360343.8U CN201720360343U CN206975229U CN 206975229 U CN206975229 U CN 206975229U CN 201720360343 U CN201720360343 U CN 201720360343U CN 206975229 U CN206975229 U CN 206975229U
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- mcp
- neutron
- outer barrel
- neutron detectors
- secondary electron
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Abstract
It the utility model is related to a kind of neutron detector for being applied to measure neutron time spectrum in ultrafast pulse Neutron Radiation Field, more particularly to a kind of MCP neutron detectors based on polyethylene.The utility model is overcoming the defects of neutron detector time response is slow in the prior art.Include outer barrel based on the MCP neutron detectors of polyethylene, high-voltgae pothead, signal cable head, sealing is fixed on the entrance window in outer cylinder front end face, sealing is fixed on the exit window of outer barrel rear end face, and the conversion target being fixedly installed successively in the outer barrel interior edge incident neutron direction of propagation, secondary electron multiplier part and potsherd, conversion target is polythene strip, secondary electron multiplier part is some MCP pieces for stacking setting, secondary electron multiplier part both sides load the negative electrode and anode of high-voltgae pothead respectively, the signal acquisition terminal of signal cable head is arranged on the outside of the potsherd.
Description
Technical field
It the utility model is related to a kind of neutron detection for being applied to measure neutron time spectrum in ultrafast pulse Neutron Radiation Field
Device, more particularly to one kind utilize neutron to be incident on recoil proton caused by polyethylene reaction in MCP and produce secondary electron simultaneously again
Increase output pulsed current signal, so as to realize the detector to neutron measurement.
Background technology
The high-power electron beam of ps magnitudes, which is incident to thick metallic target, can produce pulse width in ns magnitudes even sub- ns magnitudes
Neutron, it has the features such as neutron intensity is low, and neutron energy has a very wide distribution.By inertial confinement fusion (ICF), can also produce
Ultrafast neutron of the pulse width in sub- ns magnitudes.To measure ultrafast pulse neutron, it is desirable to which neutron detector has the ultrafast time
Response and higher neutron response.
And the conventional detector for measuring pulsed neutron at present has thin plastic scintillator film detector, scintillating fiber detector and slit
Fission detector.
Thin plastic scintillator film detector and scintillating fiber detector are swashed using neutron caused recoil proton in scintillator
Hair scintillator luminous principle detects neutron, yet with the luminescence decay time of flicker film and scintillating fiber all ns with
On, used photomultiplier transit increases pipe time response also in ns magnitudes, which dictates that the time response of detector is in more than ns.It is narrow
Seam fission detector uses fission fragment caused by PIN detection neutron fission target fissions to realize the detection to neutron,
And PIN time response is generally in more than ten more than ns.
The content of the invention
The purpose of this utility model is：A kind of MCP (i.e. microchannel plate) neutron detector based on polyethylene is provided, to
Overcome the defects of neutron detector time response is slow in the prior art.
In order to solve the above technical problems, the technical solution adopted in the utility model is：
A kind of MCP neutron detectors based on polyethylene, it is characterized in that：Including outer barrel, high-voltgae pothead, signal
End, the entrance window in outer cylinder front end face is arranged on, is arranged on the exit window of outer barrel rear end face, and enter in the outer barrel interior edge
Conversion target, secondary electron multiplier part and potsherd that the sub- direction of propagation is fixedly installed successively are hit, the conversion target is poly- second
Alkene piece, the secondary electron multiplier part are some MCP pieces for stacking setting, and secondary electron multiplier part both sides load institute respectively
The negative electrode and anode of high-voltgae pothead are stated, the signal acquisition terminal of the signal cable head is arranged on the outside of the potsherd.
Further, the secondary electron multiplier part is a piece of or two panels or three MCP pieces.
Further, clamping plate and pole are additionally provided with the outer barrel, conversion target and the secondary electron multiplier part is consolidated
It is scheduled on the clamping plate, the clamping plate is fixed on exit window by the pole.
Further, the clamping plate is 40mm apart from exit window, and the clamping plate is made up of polytetrafluoroethylene (PTFE).
Further, the entrance window and exit window are circular flange structure, and center is internally recessed thin window.
Further, signal cable head and the high-voltgae pothead sealing is fixed on exit window, the number of signal cable head
Measure as 1, the quantity of high-voltgae pothead is 2.
Further, it is additionally provided with vacuum pumping opening on the outer barrel.
Further, the profile of the outer barrel is cylinder.
The utility model is relative to the beneficial effect of prior art：
1st, the utility model has ultrafast time response, about hundred ps.MCP pieces used by the utility model, its time
Response is less than 100ps, and run duration of the recoil proton in polythene strip is less than 30ps as caused by polythene strip, which dictates that
Neutron detector of the present utility model has ultrafast time response.
2nd, the utility model has higher fast neutron sensitivity.According to two panels MCP pieces, gain can be to 106, use
Polythene strip and elastic neutron scattering action section are larger, and caused recoil proton number is more, and single recoil proton is in MCP pieces
Caused secondary electron can be to 3~4 in duct, thus the utility model can realize higher fast neutron sensitivity, can reach
To 10-15C·cm2。
3rd, the utility model is easily installed, replaces polythene strip and MCP pieces.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment；
Fig. 2 is conversion target, close-up schematic view at secondary electron multiplier part and potsherd；
Fig. 3 is that different-energy neutron is calculated using monte carlo method simulation to act on the production of different-thickness polythene strip
Raw single recoil proton caused secondary electron yield graph of a relation on MCP piece inwalls；
Fig. 4 is that different-energy neutron is calculated using monte carlo method simulation to produce with the effect of different-thickness polythene strip
Raw outgoing proton yield graph of a relation；
Fig. 5 is that the different-energy neutron that unit strength is calculated using monte carlo method simulation acts on different-thickness
Polythene strip caused secondary electron yield graph of a relation on MCP piece inwalls；
Fig. 6 is to work as to use gain as 2.25 × 106Two panels MCP pieces when, the neutron response theoretical calculation of the present embodiment
Result schematic diagram；
Fig. 7 is that recoil proton is calculated using monte carlo method simulation in the mean time of flight of polythene strip to illustrate
Figure；
Wherein：1- outer barrels, 2- entrance windows, 3- exit windows, 4- poles, 5- clamping plates, 6- polythene strips, 7-MCP pieces, 8- signals
End, 9- high-voltgae potheads, 10- vacuum pumping openings, 11- copper sheets one, 12- copper rings, 13- potsherds, 14- copper sheets two, in 15-
Beamlet.
Embodiment
The utility model is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As Figure 1-Figure 2, embodiment provides a kind of MCP neutron detectors based on polyethylene, including outer barrel 1, sealing
The entrance window 2 of the front end face of outer barrel 1 is fixed on, sealing is fixed on the exit window 3 of the rear end face of outer barrel 1, the branch being fixed on exit window 3
Bar 4, the clamping plate 5 on pole 4, be fixed on polythene strip 6 on clamping plate 5, copper sheet 1, MCP pieces 7, copper ring 12,
Potsherd 13 and copper sheet 2 14, the signal cable first 8 and high-voltgae pothead 9 being fixed on exit window 3, are arranged on the side of outer barrel 1
Vacuum pumping opening 10, copper sheet 1 is connected with the copper conductor of the inner core of high-voltgae pothead 9, copper ring 12 and the shell of high-voltgae pothead 9
Copper conductor connection, copper sheet 2 14 is connected with the copper conductor of signal cable first 8；Outer barrel 1 is to use cylinder made of stainless steel,
External diameter Φ 120mm, internal diameter Φ 112mm, long 83mm；The entrance window 2 and exit window 3 of the front and back end of outer barrel 1 are circular flange structure, method
Blue diameter of phi 150mm, flange center are a thick 0.5mm, a diameter of 60mm thin window；Pole 4 is stainless steel, long 5cm, is counted
Measure as 3, two neighboring pole 4 is separated by 120 ° and is uniformly arranged on exit window 3；Clamping plate 5 is the poly- of diameter of phi 80mm, thick 5mm
Tetrafluoroethene plate, the centre of clamping plate 5 are the circular hole of diameter of phi 16mm or Φ a 21mm, and circular is provided with 6 a diameter of Φ 2mm
Circular hole and 3 Φ 0.5mm screw hole, clamping plate 5 be arranged on pole 4 on, clamping plate 5 be used for fix polythene strip 6, copper sheet one
11st, MCP pieces 7, copper ring 12, potsherd 13 and copper sheet 2 14；A diameter of the Φ 16mm or Φ 21mm of polythene strip 6, thickness according to
Neutron response is needed to determine；MCP pieces 7 be channel diameter be 6 μm, duct spacing is 8 μm, thick 0.38mm, angle of chamfer (MCP
The passage of piece 7 and the angle of MCP piece both ends of the surface vertical axis) it is 6 °, external diameter Φ 16mm or Φ 25mm two panels microchannel plate；Copper
A diameter of the Φ 16mm or Φ 25mm of piece 1 and copper sheet 2 14, thickness 1mm；The external diameter of copper ring 12 is Φ 16mm or Φ
25mm, internal diameter are Φ 12mm or Φ 21mm, thickness 1mm；Signal cable first 8 is used to lead detectable signal inside vacuum chamber
Go out on the signal-obtaining instrument to outside chamber；High-voltgae pothead 9 is used to lead high pressure from the high-voltage power supply outside vacuum chamber to proceed to
On the MCP pieces 7 of intracavitary；The internal diameter of vacuum pumping opening 10 is 16mm, and bleeding point centre distance exit window 3 is 40mm, for vacuum
Chamber interior vacuumizes；The resistance that resistance is 50M Ω, copper sheet 2 14 and letter are additionally provided between copper ring 12 and high-voltgae pothead 9
The resistance that resistance is 100k Ω is additionally provided between number end 8；Outer barrel 1 passes through cushion rubber or the edge of a knife and entrance window 2, exit window 3
It is sealed, it is ensured that detector vacuum chamber dynamic vacuum is less than 1 × 10-4Pa；The inner surface of outer barrel 1 will be processed by shot blasting to subtract
Few inner surface is deflated.
The operation principle of the neutron detector is：Neutron beam 15 and polythene strip 6 react caused by recoil proton enter
Penetrate to produce secondary electron in the duct of MCP pieces 7 and double and export pulsed current signal, so as to realize the measurement to neutron.
Fig. 3 is that different-energy neutron is calculated using monte carlo method simulation to act on the production of different-thickness polyethylene converter
Raw single recoil proton caused secondary electron yield on MCP piece inwalls.As can be known from Figure, energy be 0.2MeV~
The caused secondary electron yield on MCP piece inwalls of single recoil proton caused by 0.25MeV neutron is maximum, about 3~4.
Fig. 4 is that different-energy neutron is calculated using monte carlo method simulation to produce with the effect of different-thickness polyethylene
Outgoing proton yield.It can be seen that for polyethylene thick 0.1mm~1.5mm, when the energy of incident neutron is higher than certain value
When, the yield for being emitted proton changes less with neutron energy；For the polyethylene of more than 1.5mm thickness, the energy of incident neutron
Bigger, the yield for being emitted proton is more.
Fig. 5 is that the different-energy neutron that unit strength is calculated using monte carlo method simulation acts on different-thickness
Polyethylene converter caused secondary electron yield on MCP piece inwalls.It can be seen that when polyethylene converter thickness is less than 2.0mm,
The yield of secondary electron reaches maximum when neutron energy is certain value；When polyethylene converter thickness is more than 2.0mm, secondary electron
Yield increases with the increase of neutron energy.
Fig. 6 is the neutron response result of calculation of the detector, and this is to use gain as 2.25 × 106Two panels MCP pieces
Obtain.As can be known from Figure, when polyethylene converter thickness is less than 2.0mm, the neutron response of detector is certain in neutron energy
Reach maximum during one value；When polyethylene converter thickness is more than 2.0mm, the neutron response of detector with neutron energy increase
And increase.When polyethylene converter thickness is more than 1.0mm, detector to energy more than 1MeV neutron response be more than 1.0 ×
10-15C·cm2。
Fig. 7 is that mean time of flight of the recoil proton in polyethylene is calculated using monte carlo method simulation, from meter
Calculate result and understand that the mean time of flight of recoil proton is not more than 30ps.
Claims (8)
- A kind of 1. MCP neutron detectors based on polyethylene, it is characterised in that：Including outer barrel, high-voltgae pothead, signal cable Head, sealing are fixed on the entrance window in outer cylinder front end face, and sealing is fixed on the exit window of outer barrel rear end face, and in the outer barrel Conversion target, secondary electron multiplier part and the potsherd being fixedly installed successively along the incident neutron direction of propagation, the conversion target are Polythene strip, the secondary electron multiplier part are some MCP pieces for stacking setting, and secondary electron multiplier part both sides add respectively The negative electrode and anode of the high-voltgae pothead are carried, the signal acquisition terminal of the signal cable head is arranged on the outside of the potsherd.
- A kind of 2. MCP neutron detectors based on polyethylene according to claim 1, it is characterised in that：The secondary electricity Sub- multiplier device is a piece of or two panels or three MCP pieces.
- A kind of 3. MCP neutron detectors based on polyethylene according to claim 2, it is characterised in that：In the outer barrel Clamping plate and pole are additionally provided with, conversion target and the secondary electron multiplier part is fixed on the clamping plate, and the clamping plate passes through The pole is fixed on exit window.
- A kind of 4. MCP neutron detectors based on polyethylene according to claim 3, it is characterised in that：The clamping plate away from It is 40mm from exit window, the clamping plate is made up of polytetrafluoroethylene (PTFE).
- A kind of 5. MCP neutron detectors based on polyethylene according to claim 4, it is characterised in that：The entrance window It is circular flange structure with exit window, center is internally recessed thin window.
- A kind of 6. MCP neutron detectors based on polyethylene according to claim 5, it is characterised in that：The signal electricity Cable end and high-voltgae pothead sealing are fixed on exit window, and the quantity of signal cable head is 1, and the quantity of high-voltgae pothead is 2 It is individual.
- A kind of 7. MCP neutron detectors based on polyethylene according to claim 6, it is characterised in that：On the outer barrel It is additionally provided with vacuum pumping opening.
- A kind of 8. MCP neutron detectors based on polyethylene according to claim 7, it is characterised in that：The outer barrel Profile is cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720360343.8U CN206975229U (en) | 2017-04-07 | 2017-04-07 | A kind of MCP neutron detectors based on polyethylene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720360343.8U CN206975229U (en) | 2017-04-07 | 2017-04-07 | A kind of MCP neutron detectors based on polyethylene |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970412A (en) * | 2017-04-07 | 2017-07-21 | 西北核技术研究所 | A kind of MCP neutron detectors based on polyethylene |
| CN114924307A (en) * | 2022-04-29 | 2022-08-19 | 西北核技术研究所 | MCP neutron detection system and measurement method based on secondary electrons generated by charged particles |
-
2017
- 2017-04-07 CN CN201720360343.8U patent/CN206975229U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970412A (en) * | 2017-04-07 | 2017-07-21 | 西北核技术研究所 | A kind of MCP neutron detectors based on polyethylene |
| CN114924307A (en) * | 2022-04-29 | 2022-08-19 | 西北核技术研究所 | MCP neutron detection system and measurement method based on secondary electrons generated by charged particles |
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