CN208113046U - A kind of ion source apparatus - Google Patents
A kind of ion source apparatus Download PDFInfo
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- CN208113046U CN208113046U CN201820728190.2U CN201820728190U CN208113046U CN 208113046 U CN208113046 U CN 208113046U CN 201820728190 U CN201820728190 U CN 201820728190U CN 208113046 U CN208113046 U CN 208113046U
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- ion source
- cathode
- collimator
- anode canister
- anode
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Abstract
The utility model discloses a kind of ion source apparatus, the ion source uses the heavy platform pore structure of anode canister, cooperate this interstitial structure in conjunction with the collimator and cathode of sunk type or jet tube, the distance between cathode and collimating aperture can be effectively increased, increase collimator face to the surface area of cathode portion, the effective volume for condensing cathodic metal steam in collimator is promoted, the influence come due to cathodic metal vapour condensation zone is weakened；The discharging structure of anode and cathode composition effectively improves the production efficiency of negative hydrogen ion, while decreasing the evaporation rate of cathode material；Under the premise of not changing anode canister length, collimator is mounted on inside anode canister, air pressure in ion source can be made to be maintained at a higher value, to reduce the air demand of outer bound pair ion source, effectively reduce transport losses of the line in accelerator, the discharge stability and discharge life of ion source are effectively improved, the working life of ion source apparatus is effectively promoted with this.
Description
Technical field
The utility model relates to a kind of cyclotron apparatus fields, and in particular to a kind of ion source apparatus.
Background technique
In modern medicine, positron emission computerized tomography (Positron Emission Tomography,
PET) technology is used to be accurately positioned the position of tumour.In PET technology, patient is injected can spontaneous generation positron decay
Radioactive isotope synthetic drug, these drugs are usually that can quickly participate in substance (such as 18F- fluoro-of metabolic process
1,5-anhydroglucitol, FDG), since the metabolic rate of lesions position is very high, so FDG will be enriched at these positions, and FDG has
There is positron decay characteristic, annihilation reaction, transmitting will occur with the intracorporal electronics of body for the positive electron that they emit after decaying
The photon that two energy are 0.511MeV out, can be accurate by the reduction of image after these photons are captured by imaging system
Tumorigenic position all in body is navigated to, it is human health that this diagnostic mode, which improves the cure rate of cancer,
Gospel.
The radioactive isotope used needed for PET is produced by medical cyclotron, built in this ion source
In accelerator center, belong to the gas discharge device of electromagnetic field containment.When work, it is passed through hydrogen to ion source discharge is intracavitary,
Apply a high-intensity magnetic field in the axial direction of anode canister, then in cathode, to electric field is applied between cathode and anode, at this moment hydrogen can be sent out
Raw electric discharge, can form positive hydrogen ion and negative hydrogen ion, and accelerator is drawn the negative hydrogen ion generated in ion source using electric field
It enters in accelerating cavity, ion, which is accelerated to practice shooting after certain energy by the effect of electromagnetic field, in accelerating cavity generates radiation
Property isotope.The ion source is utilized for cyclotron and provides negative hydrogen ion line, has compact-sized, simple, at low cost
The features such as honest and clean, but be to ensure that and be supplied to the enough lines of accelerator, it is necessary to when promoting operating power or the work of ion source
Between, this will affect the working life of ion source；The existing technology than more typical promotion ion source life is by changing sun
The size of seam, open-ended bias are drawn to promote the ability that ion source generates line in pole cylinder side, promote ion source with this
Service life in accelerator；However there are following defects for the ion source apparatus：First, ion source is interior highdensity in high power
Discharge condition, cathode are locally vaporized since the bombardment of a large amount of cations is up to the temperature close to fusing point, these cathodes
Evaporant will be in colder ion source shell and anode, collimator surface condensation, by working for a long time, metallic vapour
It is constantly accumulated in electrode surface, constantly reduces the gap between cathode and anode, finally make to occur between ion source anode and cathode short
Road makes ion source life terminate；Second, cathodic sputtering object can peel off, and make ion source that short circuit occur, ion source is caused to work
It is unstable；Third, existing ion source apparatus can promote ion source life to a certain extent, but the production of isotope is imitated
Rate is still too low, also increases the manpower and time cost of medical cyclotron maintenance；Therefore existing ion source apparatus is logical
Overregulate anode canister side draw seam size, change the means of open-ended bias promoted the mode of ion source life there are still
Larger limitation.
Utility model content
For technical problem of the existing technology, the utility model provides a kind of ion source to solve the above problems and sets
Standby, the utility model effectively improves the lasting work of ion source by the way of changing ion source yin-yang interpolar discharging structure
Make the time, also improve the line fan-out capability of ion source, to a greater extent, effectively improves the working life of ion source.
The utility model is achieved through the following technical solutions：
A kind of ion source apparatus, including anode canister, cathode and collimator, which is characterized in that the anode canister is in one
Empty cylinder, the side of the anode canister is provided with an Ion Extraction slit；Heavy platform is symmetrically arranged at the anode canister both ends
Hole, and sunk type or jet tube collimator, one end that the collimator connects with the sink hole are installed in the sink hole
It is provided with a collimating aperture concentric with the collimator, the aperture D of the collimating aperture1Less than the internal diameter of the anode canister；Institute
The assembly both ends for stating anode canister and collimator composition are symmetrically installed cathode, the cathode taps of the cathode be circle and with institute
It is concentric to state collimating aperture.
The ion source apparatus is consistent with the conventional discharge principle of Penning ion source, and axial magnetic field, which is exactly utilized, to be made to put
Electronics in electric space suffers restraints radially occurs circumnutation, reduces electronics escape in the radial direction, cathode and anode
Between electric field so that electronics is suffered restraints in the axial direction, make electronics in cathode and to roundtrip occurs between cathode.Work as electronics
It is emitted into from cathode surface to after region of discharge, good electromagnetic field environment keeps electronics past in the space that anode and cathode forms
Complex oscillation efficiently ionizes the hydrogen in space.The negative hydrogen ion formed is ionized to be added outside in extraction slit location
The effect of electric field in anode canister from being brought out into being accelerated in accelerating cavity.
In order to enable ion source is easier to the starting the arc, can discharge under lower power, and promote the electric discharge of ion source
The fit structure of stability and discharge life, collimation device and cathode advanced optimizes, it is preferred that the cathode taps and institute
State the nearest distance H of anode canister1For 0.5~2mm, the depth of the collimator is H3, the cathode taps and the collimating aperture away from
From (H1+H3) it is 1~4.5mm.
Preferably, the cathode taps (H at a distance from the collimating aperture1+H3) it is 2.5~3.5mm.
In order to reduce the peeling risk of metal sputtering object in anode canister and collimator, and the service life of ion source is effectively promoted,
The fit structure of cathode header structure and cathode, collimator, anode canister is advanced optimized, it is preferred that the collimating aperture
Aperture D1It is less than the internal diameter D of the collimator for 3~6mm, the diameter d of the cathode taps2, greater than the aperture D of the collimating aperture1。
Preferably, the aperture D of the diameter d Yu the collimating aperture of the cathode taps1Difference is more than or equal to 0.5mm.
Preferably, the internal diameter D of the collimator2It is more than or equal to H with the diameter d difference of the cathode taps1。
The utility model has the following advantages and benefits：
1, the utility model uses the heavy platform structure of anode canister, cooperates in conjunction with the collimator and cathode of sunk type or jet tube
This interstitial structure can effectively increase the distance between cathode and collimating aperture, increase collimator face to the surface of cathode portion
Product is promoted the effective volume for condensing cathodic metal steam in collimator, weakens the influence come due to cathodic metal vapour condensation zone；
Under the premise of not changing anode canister length, collimator is mounted on inside anode canister, air pressure in ion source can be made to be maintained at
One higher value effectively reduces transport losses of the line in accelerator, has to reduce the air demand of outer bound pair ion source
Effect improves the discharge stability and discharge life of ion source, and the working life of ion source apparatus is effectively promoted with this.
2, the fit structure of the utility model sunk type or jet tube collimator and cathode makes ion source be easier to the starting the arc, can
It discharges under lower power, improves the yield of line, can effectively promote discharge stability and the electric discharge longevity of ion source
Life.
3, the utility model uses lesser cathode construction, and cathode taps are less than collimator internal diameter, is slightly larger than collimating aperture aperture,
So that cathodic sputtering object is limited in collimator, effectively contain cathodic sputtering object and high evaporation temperature metal in cathode and sun
Accumulation between the cylinder of pole, and anode canister and collimator are reduced in H1The peeling of position metal sputtering object leads to the risk of short circuit；
Compared to more traditional big cathode construction, the evaporation rate of cathode material can be reduced using this small-sized cathode construction of the application,
Anticathode ablation of discharging is reduced, the service life of ion source electric discharge is extended.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment.In the accompanying drawings：
Fig. 1 is the ion source apparatus structural schematic diagram of the utility model.
Fig. 2 is the ion source apparatus structure sectional view of the utility model.
Fig. 3 is the sunk type collimator structure cross-sectional view of the utility model.
Fig. 4 is the jet tube collimator structure cross-sectional view of the utility model.
Fig. 5 is the anode canister structure sectional view of the utility model.
Fig. 6 is the cathode construction schematic diagram of the utility model.
Label and corresponding parts title in attached drawing：
1- anode canister, 1.1- sink hole, 1.2- draw slit, 2- cathode, 2.1- cathode taps, 3- collimator, 3.1- collimation
Hole.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below with reference to embodiment and attached drawing,
The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this
Utility model is not intended to limit the scope of the present invention.
Embodiment
As shown in Figs. 1-5, ion source apparatus described in the utility model includes：Anode canister (1), cathode (2), collimator
(3)。
Anode canister (1) is a hollow cylinder, and the side of anode canister (1) is provided with an Ion Extraction slit along axial direction
(1.2), it is symmetrically arranged with sink hole (1.1) at anode canister (1) both ends, the center of the sink hole (1.1) is in the anode canister
(1) in the plane that central axis and the axis of symmetry for drawing slit (1.2) is constituted；In sink hole install sunk type or
Person's jet tube collimator (3) is provided with one in one end that collimator (3) connects with the sink hole (1.1) and collimator (3) is same
The collimating aperture (3.1) of the heart, collimating aperture (3.1) bore are less than anode canister (1) internal diameter, in anode canister (1) and collimator (3) composition
Assembly both ends are symmetrically installed cathode (2), and cathode taps (2.1) are round and concentric with collimating aperture (3.1).It is described in the utility model
Discharging structure further include by the shape and structure of the discharge gas space of electrodes surrounding.
The ion source is consistent with the conventional discharge principle of Penning ion source, and axial magnetic field, which is exactly utilized, keeps electric discharge empty
Interior electronics suffers restraints radially occurs circumnutation, reduces electronics escape in the radial direction, cathode (2) and anode
(1) electric field between makes electronics suffer restraints in the axial direction, make electronics cathode (2) and to occurring between cathode (2) back and forth it is anti-
It penetrates.When electronics is emitted into from cathode surface to after region of discharge, good electromagnetic field environment forms electronics in anode and cathode
Space in reciprocating vibration, efficiently the hydrogen in space is ionized.It ionizes the negative hydrogen ion formed and is drawing slit
(1.2) position is by the effect of extra electric field from being brought out in anode canister (1) into being accelerated in accelerating cavity.
In the present embodiment, cathode taps and the nearest distance H of anode canister1It should control in 0.5mm~2mm, the hole of collimating aperture
Diameter D1In 3mm~6mm, cathode taps need and collimator inner hole is concentric installs, and the diameter d of cathode taps is larger than D1(and d-D1≥
0.05mm), collimator internal diameter D2It needs (D bigger than d2≥d+H1), the depth of collimator is H3, (H1+H3) depth need to control
It is optimal with 2.5mm~3.5mm in 1mm~4.5mm.
The discharging gap structure that the present embodiment is formed by the heavy platform pore structure, collimator and cathode of anode canister, increases yin
Pole reduces the size of cathode taps at a distance from collimating aperture, increases collimator face to cold on the surface area and collimator of cathode portion
The effective volume of solidifying cathodic metal steam；This method effectively improves the discharge stability and discharge life of ion source.
Above-described specific embodiment, to the purpose of this utility model, technical scheme and beneficial effects carried out into
One step is described in detail, it should be understood that being not used to limit the foregoing is merely specific embodiment of the present utility model
Determine the protection scope of the utility model, within the spirit and principle of the utility model, any modification for being made equally is replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (6)
1. a kind of ion source apparatus, including anode canister (1), cathode (2) and collimator (3), which is characterized in that the anode canister
It (1) is a hollow cylinder, the side of the anode canister (1) is provided with an Ion Extraction slit (1.2)；In the anode canister
(1) both ends are symmetrically arranged with sink hole (1.1), and sunk type or jet tube collimator are installed on the sink hole (1.1)
(3), one end that the collimator (3) connects with the sink hole (1.1) is provided with a collimation concentric with the collimator (3)
Hole (3.1), the aperture D of the collimating aperture (3.1)1Less than the internal diameter of the anode canister (1)；The anode canister (1) with it is described
The assembly both ends of collimator (3) composition are symmetrically installed cathode (2), the cathode taps (2.1) of the cathode (2) be circle and with institute
It is concentric to state collimating aperture (3.1).
2. a kind of ion source apparatus according to claim 1, which is characterized in that the cathode taps (2.1) and the anode
The nearest distance H of cylinder (1)1For 0.5~2mm, the depth of the collimator (3) is H3, the cathode taps (2.1) and the collimation
Distance (the H in hole (3.1)1+H3) it is 1~4.5mm.
3. a kind of ion source apparatus according to claim 2, which is characterized in that the cathode taps (2.1) and the collimation
Distance (the H in hole (3.1)1+H3) it is 2.5~3.5mm.
4. a kind of ion source apparatus according to claim 1, which is characterized in that the aperture D of the collimating aperture (3.1)1It is 3
~6mm, the diameter d of the cathode taps (2.1) are less than the internal diameter D of the collimator (3)2, it is greater than the hole of the collimating aperture (3.1)
Diameter D1。
5. a kind of ion source apparatus according to claim 1, which is characterized in that the diameter d of the cathode taps (2.1) and institute
State the aperture D of collimating aperture (3.1)1Difference is more than or equal to 0.5mm.
6. a kind of ion source apparatus according to claim 1, which is characterized in that the internal diameter D of the collimator (3)2With it is described
The diameter d difference of cathode taps (2.1) is more than or equal to H1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820728190.2U CN208113046U (en) | 2018-05-16 | 2018-05-16 | A kind of ion source apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820728190.2U CN208113046U (en) | 2018-05-16 | 2018-05-16 | A kind of ion source apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN208113046U true CN208113046U (en) | 2018-11-16 |
Family
ID=64113783
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| CN201820728190.2U Active CN208113046U (en) | 2018-05-16 | 2018-05-16 | A kind of ion source apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108419356A (en) * | 2018-05-16 | 2018-08-17 | 中国工程物理研究院流体物理研究所 | Method and ion source apparatus for promoting the cyclotron internal ion-source service life |
-
2018
- 2018-05-16 CN CN201820728190.2U patent/CN208113046U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108419356A (en) * | 2018-05-16 | 2018-08-17 | 中国工程物理研究院流体物理研究所 | Method and ion source apparatus for promoting the cyclotron internal ion-source service life |
| CN108419356B (en) * | 2018-05-16 | 2023-09-22 | 中国工程物理研究院流体物理研究所 | Method for improving service life of ion source in cyclotron and ion source equipment |
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