阅读说明：本技术 一种用于高能粒子加速器的束屏 (A kind of Shu Ping for high-energy particle accelerator ) 是由 范佳锟 王洁 王盛 许章炼 高勇 游志明 杨尚辉 张倩 于 2019-07-12 设计创作，主要内容包括：本发明公开了一种用于高能粒子加速器的束屏,束屏第一壁位于束屏第二壁的外侧,第一冷却剂通道及第二冷却剂通道均位于束屏第一壁与束屏第二壁之间,且第一冷却剂通道的外壁及第二冷却剂通道的外壁均与束屏第一壁的内壁及束屏第二壁的外壁相接触；束屏第一壁上沿轴向开设有第一通槽及第二通槽,其中,第一通槽正对第一冷却剂通道,且第一通槽通过第一冷却剂通道封闭,第二通槽对应第二冷却剂通道,且第二通槽通过第二冷却剂通道封闭,束屏第二壁上沿轴向开设有第三通槽及第四通槽,束屏第一壁的内壁上沿轴向设置有散热块,散热块上设置有第三冷却剂通道,该束屏能够有效的提高超级质子-质子对撞机中束流管道的散热性能。(The invention discloses a kind of Shu Ping for high-energy particle accelerator, the first wall of beam screen is located at the outside of the second wall of beam screen, first coolant channel and the second coolant channel are respectively positioned between the second wall of the first wall of beam screen and beam screen, and the outer wall of the outer wall of the first coolant channel and the second coolant channel is in contact with the outer wall of the second wall of inner wall and beam screen of beam the first wall of screen；The first through slot and the second through slot are provided in the axial direction on the first wall of beam screen, wherein, first the first coolant channel of through slot face, and first through slot pass through the first coolant channel close, second through slot corresponds to the second coolant channel, and second through slot pass through the second coolant channel close, third through slot and the 4th through slot are provided in the axial direction on the second wall of beam screen, it is axially disposed on the inner wall of the first wall of beam screen to have radiating block, third coolant channel is provided on radiating block, which can effectively improve the heat dissipation performance of beam current tube in super proton-proton collider.)

1. a kind of Shu Ping for high-energy particle accelerator, which is characterized in that including cold tube wall (4) and be located at cold tube wall (4) Interior the first wall of beam screen (1), the second wall of Shu Ping (5), the first coolant channel (21) and the second coolant channel (22)；

The first wall of beam screen (1) is located at the outside of the second wall of beam screen (5), the first coolant channel (21) and the second coolant channel (22) it is respectively positioned between the first wall of beam screen (1) and the second wall of beam screen (5), and the outer wall of the first coolant channel (21) and second cold But the outer wall of agent channel (22) is in contact with the outer wall of the inner wall of the first wall of beam screen (1) and the second wall of beam screen (5)；

The first through slot and the second through slot are provided in the axial direction on the first wall of beam screen (1), wherein first the first coolant of through slot face Channel (21), and the first through slot is closed by the first coolant channel (21), the second through slot is corresponding second coolant channel (22), And second through slot closed by the second coolant channel (22), third through slot and the are provided in the axial direction on the second wall of Shu Ping (5) Four through slots, axially disposed on the inner wall of the first wall of Shu Ping (1) to have radiating block (6), radiating block is provided with third coolant on (6) Channel (7) offers several gas vents (3) on the first wall of Shu Ping (1).

2. the Shu Ping according to claim 1 for high-energy particle accelerator, which is characterized in that the radiating block (6) Cross section is triangular structure.

3. the Shu Ping according to claim 1 for high-energy particle accelerator, which is characterized in that radiating block (6) and each row Stomata (3) is located at the two sides of the second wall of beam screen (5).

4. the Shu Ping according to claim 1 for high-energy particle accelerator, which is characterized in that radiating block (6) face institute State third through slot.

5. the Shu Ping according to claim 1 for high-energy particle accelerator, which is characterized in that on the outside of radiating block (6) with The distance between cold 4 center line of tube wall is 15.08mm.

6. the Shu Ping according to claim 1 for high-energy particle accelerator, which is characterized in that third coolant channel (7) internal diameter is 1.52mm.

Technical field

The present invention relates to a kind of Shu Ping, and in particular to a kind of Shu Ping for high-energy particle accelerator.

Background technique

Superconductor technology has become one of key technology of high-energy particle accelerator, and operation needs large-scale helium cryogenic refrigeration system System.High-intensitive particle beam can generate energy in vacuum chamber interior walls by different physical processes in the process of running in accelerator Deposition.In order to improve the heat-sinking capability in vacuum pipe, need to intercept and shift using the beam screen being located inside superconducting magnet These heat loads.Compared with the heat leak of cryostat, the heat load that line acts on vacuum-chamber wall can be bigger.Shu Ping The a part of (beam screen) as high-energy particle accelerator ultra-high vacuum system, main there are two critical functions.First is that logical It crosses the opening of Shu Ping and causes desorption yield to reduce synchrotron radiation light/ion/electronics of low temperature condensing gases molecule on beam current tube, To reduce pressure unstability.Second is that heat load caused by interception and transfer synchrotron radiation/image current/electron cloud etc., is The normal work of superconducting magnet provides good and stable operating temperature.Since the space in superconducting magnet is very narrow, The cooling of fasciculi exilis screen faces the underlying issue of cryogenic heat transfer and fluid flowing aspect.

1991, earliest beam screen design scheme was suggested in the design report of Large Hadron Collider, and proton beam exists In beam current tube during operation, due to factors such as synchrotron radiation effect, electron cloud effect and image currents, it can generate big The thermal force of amount.These thermal forces will increase the load of refrigeration system and vacuum system.1.9K at a temperature of remove 1W function Rate needs the nearly electric energy of 1kW.Therefore, it is necessary to shift heat load by beam screen, while reducing the load of refrigeration system.

By taking the super proton-proton collider that China proposes as an example, designed circumference 100km, the energy of colliding proton beam Amount is 37.5TeV^[1].Make proton beam stable operation in pipeline, the magnetic field strength needed is 12T.For super proton-matter For sub- collider, superconducting magnet needs work at very low temperature.Therefore, the heat load generated in pipeline need to use Shu Ping To absorb, and heat is shifted by cooling pipe, the heating conduction of this halved tie screen is a greatly challenge.

In Large Hadron Collider, when beam energy is 7TeV, the synchrotron radiation power that line generates is 0.17W/m^[2].And in super proton-proton collider, when beam energy is 37.5TeV, synchrotron radiation power is 16.49W/m.Greatly The Shu Ping of type hadronic wave-function cools down it using two narrow thin pipes.It will be apparent that if using Large Hadron Collider Beam screen design parameter, be the cooling requirements for not being able to satisfy super proton-proton collider.Therefore, it is necessary to design a kind of be applicable in In the novel Shu Ping of the following super proton-proton collider, for improving dissipating for beam current tube in super proton-proton collider Hot property, to ensure the stable operation of line.

Summary of the invention

It is an object of the invention to overcome the above-mentioned prior art, provide a kind of for high-energy particle accelerator Shu Ping, the beam screen can effectively improve the heat dissipation performance of beam current tube in super proton-proton collider.

In order to achieve the above objectives, the Shu Ping of the present invention for high-energy particle accelerator includes cold tube wall and is located at The first wall of beam screen, the second wall of Shu Ping, the first coolant channel, the second coolant channel in cold tube wall；

The first wall of beam screen is located at the outside of the second wall of beam screen, and the first coolant channel and the second coolant channel are respectively positioned on beam Shield between the second wall of the first wall and beam screen, and the outer wall of the outer wall of the first coolant channel and the second coolant channel is and Shu Ping The outer wall of the second wall of inner wall and beam screen of first wall is in contact；

The first through slot and the second through slot are provided in the axial direction on the first wall of beam screen, wherein the first through slot face first is cooling Agent channel, and the first through slot is closed by the first coolant channel, corresponding second coolant channel of the second through slot, and the second through slot It is closed by the second coolant channel, is provided in the axial direction with third through slot and the 4th through slot, the first wall of Shu Ping on the second wall of Shu Ping Inner wall on it is axially disposed have radiating block, third coolant channel is provided on radiating block, if offering on the first wall of Shu Ping Dry gas vent.

The cross section of the radiating block is triangular structure.

Radiating block and each gas vent are located at the two sides of the second wall of beam screen.

Third through slot described in radiating block face.

The distance between radiating block outside and cold tube wall center line are 15.08mm.

The internal diameter of third coolant channel is 1.52mm.

The invention has the following advantages:

Shu Ping of the present invention for high-energy particle accelerator is when specific operation, on the basis of original beam screen design On, radiating block is newly increased at synchrotron radiation thermal force, can preferably be spread in Shu Ping convenient for heat, while in radiating block In offer third coolant channel, cooled down in the local halved tie screen nearest apart from heat source, to improve super proton-proton The heat dissipation performance of beam current tube in collider.

Detailed description of the invention

Fig. 1 a is structural schematic diagram of the invention；

Fig. 1 b is left view of the invention；

Fig. 2 a is the structural schematic diagram of the prior art；

Fig. 2 b is the left view of the prior art；

Fig. 3 is the temperature profile of existing Shu Ping；

Fig. 4 a is temperature profile of the invention；

Fig. 4 b is local temperature distribution map of the invention；

Fig. 5 is dimensional drawing of the invention；

Fig. 6 is the distribution map of gas vent 3 in the present invention.

Wherein, 1 it is the first wall of beam screen, 21 be the first coolant channel, 22 be the second coolant channel, 3 is gas vent, 4 It is the second wall of beam screen for cold tube wall, 5,6 be radiating block, 7 is third coolant channel.

Specific embodiment

The invention will be described in further detail with reference to the accompanying drawing:

The heat load of Shu Ping includes: that heat load caused by synchrotron radiation, heat load caused by image current and electron cloud draw The heat load risen, for super proton-proton collider, heat load caused by synchrotron radiation, image current and electron cloud It calculates as follows:

1) heat load caused by synchrotron radiation

In super proton-proton collider, thermal force caused by synchrotron radiation is the main source of total thermal load, synchronous Radiation-induced thermal force are as follows:

Wherein, e is unit charge, ε₀For permittivity of vacuum, m₀For protonatomic mass, c is the light velocity, and E is beam energy, and ρ is Bending radius, I are beam current, and for super proton-proton collider, synchrotron radiation power is 16.49W/m.

2) heat load caused by image current

The inner wall of beam current tube allows for conduction image current, which directly depends on the resistance of vacuum-chamber wall material Rate, heat load caused by image current are as follows:

Wherein, R is the mean radius of machine,For Euler's gamma function, M is the number of beam group, and b is the half of Shu Ping Highly, N_bFor the proton number of each beam group the inside, Z₀For space impedance, σ_tFor Electron bunch length, in Large Hadron Collider, P₂ =48mW/m, since the beam parameters of super proton-proton collider are compared in not magnitude with Large Hadron Collider Difference, the image current power loss of the two are all mw grades.

3) heat load caused by electron cloud

Electron cloud is synchrotron radiation, line bombardment residual gas and ion bombardment vacuum-chamber wall respectively there are three source, The thermal force of electron cloud are as follows:

P₃=E_peY10¹⁷ (3)

Wherein, E_peLine photon flux for mean electron energy, Y=0.02, super proton-proton collider is about 4.2 ×10¹⁷photons m^-1s^-1, ignore secondary electron and photon reflection, when Y takes 0.02, the photoelectric yield of incident electron is 8.4 ×10¹⁵photons m^-1s^-1.Assuming that the electron cloud in vacuum pipe be it is equally distributed, when single Shu Tuanjing is out-of-date, single electricity The average energy that son obtains is about 500eV, and therefore, for super proton-proton collider, thermal force caused by electron cloud is about 0.59W/m。

In short, comprehensively consider heat load caused by these three factors, total heat load P_T=P₁+P₂+P₃=17.08W/m.

With reference to Fig. 1 a, Fig. 1 b, Fig. 5 and Fig. 6, the Shu Ping of the present invention for high-energy particle accelerator includes cold tube wall 4 and the first wall of beam screen 1 in cold tube wall 4, Shu Ping the second wall 5, the first coolant channel 21, the second coolant channel 22；The first wall of beam screen 1 is located at the outside of the second wall of beam screen 5, and the first coolant channel 21 and the second coolant channel 22 are respectively positioned on Between the first wall of beam screen 1 and the second wall of beam screen 5, and the outer wall of the outer wall of the first coolant channel 21 and the second coolant channel 22 It is in contact with the outer wall of the inner wall of the first wall of beam screen 1 and the second wall of beam screen 5；First is provided in the axial direction on the first wall of beam screen 1 Through slot and the second through slot, wherein first the first coolant channel of through slot face 21, and the first through slot passes through the first coolant channel 21 closings, corresponding second coolant channel 22 of the second through slot, and the second through slot is closed by the second coolant channel 22, Shu Ping It is provided in the axial direction with third through slot and the 4th through slot on two walls 5, it is axially disposed on the inner wall of the first wall of Shu Ping 1 to have radiating block 6, It is provided with third coolant channel 7 on radiating block 6, several gas vents 3 are offered on the first wall of Shu Ping 1.

The cross section of the radiating block 6 is triangular structure；Radiating block 6 and each gas vent 3 are located at the second wall of beam screen 5 Two sides；Third through slot described in 6 face of radiating block；The distance between 6 outside of radiating block and cold 4 center line of tube wall are 15.08mm； The internal diameter of third coolant channel 7 is 1.52mm.

Fig. 2 a and Fig. 2 b are the prior art, compared with prior art, the present invention being provided on the inner wall of the first wall of beam screen 1 Radiating block 6, wherein the center position of the radiating block 6 is axially disposed third coolant channel 7, to effectively enhance The heat-sinking capability of Shu Ping uses the beam screen maximum temperature of original design scheme for 8.3K when coolant hose channel temp is 4.2K, After applying the present invention, the maximum temperature of Shu Ping is 6.0K, and for Temperature Distribution as shown in Fig. 4 a and Fig. 4 b, heat distribution is more dispersed, By optimizing the structure of Shu Ping, being allowed to cool efficiency can be improved 27.7%.

The present invention newly increases radiating block 6 on the basis of original beam screen designs at synchrotron radiation thermal force, wherein should It is preferably spread in Shu Ping convenient for heat, while being opened at the center of radiating block 6 away from beam screen center 15.08mm in 6 outside of radiating block Equipped with third coolant channel 7, the diameter of third coolant channel 7 is 1.52mm, in the local halved tie screen nearest apart from heat source It is cooled down.