阅读说明：本技术 一种用于加速器束流线调试束流的束流准直方法 (Beam collimation method for debugging beam of accelerator beam line ) 是由 尹蒙 魏素敏 安世忠 张天爵 于 2019-11-09 设计创作，主要内容包括：本发明公开了一种用于加速器束流线调试束流的束流准直方法，该束流线将束流从加速器引出、经过束流线传输将束流输送到各个应用终端；该方法包括以下步骤：将束流线的上一个偏转磁铁的真空室出口真空管道对准束流线下一个偏转磁铁的真空室入口真空管道；对上一个偏转磁铁加电、对下一个偏转磁铁不加电；用下一个不加电束流真空管道的束流准直测量上一个加电束流管道的束流准直，从而测量束流的偏移情况；根据束流偏移情况，进行加速器束流线偏转磁铁线圈通电电流大小的调整。本发明将束流不加电时的轨迹特性结合束流加电时束流轨迹特性，将两种特性组合一起，组合以后各技术特征在功能上彼此支持，并取得了加电时测量束流准直的新的技术效果。(The invention discloses a beam collimation method for debugging beams by a beam line of an accelerator, wherein the beam line leads the beams out of the accelerator and transmits the beams to each application terminal through beam line transmission; the method comprises the following steps: aligning the vacuum chamber outlet vacuum pipe of the previous deflection magnet of the beam streamline to the vacuum chamber inlet vacuum pipe of the next deflection magnet of the beam streamline; energizing the previous deflection magnet and not energizing the next deflection magnet; measuring the beam collimation of the previous charged beam pipeline by using the beam collimation of the next non-charged beam vacuum pipeline so as to measure the beam offset condition; and adjusting the magnitude of the electrifying current of the accelerator beam line deflection magnet coil according to the beam offset condition. The invention combines the track characteristic of the beam when the beam is not electrified with the track characteristic of the beam when the beam is electrified, combines the two characteristics together, functionally supports the technical characteristics after combination, and obtains the new technical effect of measuring beam collimation when the beam is electrified.)

1. A beam collimation method for debugging beams of an accelerator beam line, wherein the beam line leads the beams out of the accelerator and transmits the beams to each application terminal through beam line transmission; more than 2 accelerator beam line deflection magnet assemblies which are continuously arranged at each turning position on a beam line are arranged, and the more than 2 accelerator beam line deflection magnet assemblies apply a turning force to the beam flowing through the turning positions to deflect beam tracks; the accelerator beam line deflection magnet assembly comprises a beam line magnet of a sector, magnetic shielding plates, a vacuum chamber inlet vacuum pipeline, a vacuum chamber outlet vacuum pipeline, a vacuum chamber collimation vacuum pipeline and an adjustable support, wherein the magnetic shielding plates correspond to two straight side surfaces of a beam line magnet beam inlet and a beam line magnet beam outlet of the sector; the method is characterized by comprising the following steps:

aligning a vacuum chamber outlet vacuum pipeline of a previous deflection magnet of a beam streamline to a vacuum chamber inlet vacuum pipeline of a next deflection magnet of the beam streamline;

step two, electrifying the previous deflection magnet and not electrifying the next deflection magnet;

measuring the beam collimation of the previous electrified beam pipeline by using the beam collimation of the next unpowered beam vacuum pipeline, thereby measuring the beam offset condition;

and step four, adjusting the size of the energizing current of the accelerator beam line deflection magnet coil according to the beam offset condition.

2. The beam collimation method for the debugging beam of the beam line of the accelerator as recited in claim 1, characterized in that: the specific process of the third step is as follows:

⑴ installing a fluorescent screen on the end face of the next beam vacuum tube without power;

the unpowered beam current vacuum pipeline is a vacuum chamber collimation vacuum pipeline;

⑵ the collimation reference of phosphor screen is the center line of vacuum chamber collimation vacuum pipe;

⑶ the direction of the beam from the previous electrified deflection magnet to the next unpowered deflection magnet is a straight line direction, and the beam flows from the vacuum pipeline at the outlet of the previous electrified vacuum chamber to the collimated vacuum pipeline of the next unpowered vacuum chamber and hits the fluorescent screen of the collimated vacuum pipeline of the next vacuum chamber;

⑷ the beam offset on the screen of the vacuum chamber collimated vacuum tube is measured and used as the beam offset of the exit vacuum tube of the last energized beam vacuum chamber.

3. The beam collimation method for the debugging beam of the accelerator beam line as recited in claim 1, characterized in that: the specific process of the step four is as follows:

⑴ if the actual movement direction of the beam deviates from the theoretical movement direction of the beam when the coil is not electrified, the current applied to the coil is reduced, that is, the magnetic field generated by the accelerator beam line deflection magnet is reduced;

⑵ when the actual movement direction of the beam deviates to the left side along the beam direction relative to the theoretical movement direction of the beam when the coil is not electrified, the current electrified by the coil is increased, that is, the magnetic field generated by the accelerator beam line deflection magnet is increased.

4. The beam collimation method for the debugging beam of the accelerator beam line as recited in claim 1, characterized in that: and the vacuum chamber outlet vacuum pipeline of the previous deflection magnet in the step one is butted with the vacuum chamber inlet vacuum pipeline of the next deflection magnet through flanges.

Technical Field

The invention belongs to the technical field of accelerators, and particularly relates to a beam collimation method for adjusting beams of an accelerator beam line.

Background

The accelerator is a special electric, magnetic and high vacuum device which can make charged particles reach high energy by being controlled by magnetic field force and accelerated by electric field force in a high vacuum field, is modern equipment for artificially providing various high-energy particle beams or radiant rays, and is an important instrument in high-energy physics.

As shown in fig. 1, a beam line 3 is an important component of an accelerator 1, and a beam led out from the accelerator is transmitted to each experimental terminal through the beam line 3.

The deflection magnet 2 is an important element on a beam line, and in the acceleration process, the deflection magnet 2 gives a bending force to the particles when controlling the particle orbit, so that the particles move along a given central orbit; at the same time, a focusing force is given to the particles to prevent them from deviating from the central track, and they return to the central track without being lost.

Disclosure of Invention

The invention provides a beam collimation method for debugging beams of an accelerator beam line, aiming at solving the problem of inconvenient beam position calibration during power-on and filling up the domestic blank.

A beam collimation method for debugging beams of an accelerator beam line, wherein the beam line leads the beams out of the accelerator and transmits the beams to each application terminal through beam line transmission; more than 2 accelerator beam line deflection magnet assemblies which are continuously arranged at each turning position on a beam line are arranged, and the more than 2 accelerator beam line deflection magnet assemblies apply a turning force to the beam flowing through the turning positions to deflect beam tracks; the accelerator beam line deflection magnet assembly comprises a beam line magnet of a sector, magnetic shielding plates, a vacuum chamber inlet vacuum pipeline, a vacuum chamber outlet vacuum pipeline, a vacuum chamber collimation vacuum pipeline and an adjustable support, wherein the magnetic shielding plates correspond to two straight side surfaces of a beam line magnet beam inlet and a beam line magnet beam outlet of the sector; the method is characterized by comprising the following steps:

aligning a vacuum chamber outlet vacuum pipeline of a previous deflection magnet of a beam streamline to a vacuum chamber inlet vacuum pipeline of a next deflection magnet of the beam streamline;

step two, electrifying the previous deflection magnet and not electrifying the next deflection magnet;

measuring the beam collimation of the previous electrified beam pipeline by using the beam collimation of the next unpowered beam vacuum pipeline, thereby measuring the beam offset condition;

and step four, adjusting the size of the energizing current of the accelerator beam line deflection magnet coil according to the beam offset condition.

The specific process of the third step is as follows:

⑴ installing a fluorescent screen on the end face of the next beam vacuum tube without power;

the unpowered beam current vacuum pipeline is a vacuum chamber collimation vacuum pipeline;

⑵ the collimation reference of phosphor screen is the center line of vacuum chamber collimation vacuum pipe;

⑶ the direction of the beam from the previous electrified deflection magnet to the next unpowered deflection magnet is a straight line direction, and the beam flows from the vacuum pipeline at the outlet of the previous electrified vacuum chamber to the collimated vacuum pipeline of the next unpowered vacuum chamber and hits the fluorescent screen of the collimated vacuum pipeline of the next vacuum chamber;

⑷ the beam offset on the screen of the vacuum chamber collimated vacuum tube is measured and used as the beam offset of the exit vacuum tube of the last energized beam vacuum chamber.

The specific process of the step four is as follows:

⑴ if the actual movement direction of the beam deviates from the theoretical movement direction of the beam when the coil is not electrified, the current applied to the coil is reduced, that is, the magnetic field generated by the accelerator beam line deflection magnet is reduced;

⑵ when the actual movement direction of the beam deviates to the left side along the beam direction relative to the theoretical movement direction of the beam when the coil is not electrified, the current electrified by the coil is increased, that is, the magnetic field generated by the accelerator beam line deflection magnet is increased.

And the vacuum chamber outlet vacuum pipeline of the previous deflection magnet in the step one is butted with the vacuum chamber inlet vacuum pipeline of the next deflection magnet through flanges.

Advantageous effects of the invention

The invention combines the track characteristic of the beam when the beam is not electrified with the track characteristic of the beam when the beam is electrified, combines the two characteristics together, and measures the beam collimation of the last electrified beam pipeline by using the beam collimation of the next unpowered beam vacuum pipeline, thereby measuring the beam offset condition; the combined technical effect is superior to the sum of the effects of each technical characteristic, and has outstanding substantive features and remarkable progress.

Drawings

FIG. 1 is a schematic view of a beam line of an accelerator according to the present embodiment;

FIG. 2a is a first perspective view of the deflection magnet of the present embodiment;

FIG. 2b is a second perspective view of the deflection magnet of the present embodiment;

FIG. 2c is a sectional plan view of the deflection magnet of the present embodiment;

FIG. 3 is a schematic diagram of a beam collimation method based on two deflection magnets according to this embodiment;

in the figure: 1-an accelerator; 2: an accelerator beam line deflection magnet assembly; 3: a beam line; 2-1: a magnetic pole; 2-2: a hoisting ring; 2-3: target, 2-4: connecting piece, 2-5: yoke, 2-6: a coil, 2-7-1-vacuum chamber outlet vacuum pipe, 2-7-2-vacuum chamber collimation vacuum pipe, 2-7-3-vacuum chamber inlet vacuum pipe, 2-8: adjustable support, 2-8-1: x-direction adjusting device, 2-8-2: y-direction adjusting device, 2-8-3: and in the Z-direction adjusting device, the beam theoretical movement direction is in the 3-coil energized state, and the beam theoretical movement direction is in the 4-coil non-energized state.

Detailed Description

The design principle of the invention is as follows:

1. the difference between the collimated object when installed powered down and when the beam is modulated powered up. The collimation object during power-off installation is a deflection magnet on a beam streamline, and the collimation object during power-on beam adjustment is a beam current in the deflection magnet;

2. the difference between the alignment reference when the installation is powered down and the alignment reference when the beam is modulated on. The collimation reference system is a world coordinate system during power-off installation, cross marks on organic glass at the end faces of the collimation pipelines and cross marks on the wall targets are overlapped, and collimation is finished after the two cross marks are overlapped. When the beam is adjusted by electrifying, the collimation reference system is that the center line of the collimation pipeline, the center of the fluorescent screen arranged on the end surface of the collimation pipeline and the center of the collimation pipeline coincide.

3. The difference between the number of deflection magnets required for collimation measurement when power is off and the number of deflection magnets required for collimation measurement when power is on for beam adjustment: the former only needs one deflection magnet, the latter needs two deflection magnets at the same time, and the former of the two deflection magnets must be measured under the power-on condition, and the latter must be measured under the power-off condition.

4. The invention skillfully uses the structure that the existing deflection magnet is provided with an inlet pipeline (a vacuum chamber inlet vacuum pipeline) and two outlet pipelines (a vacuum chamber outlet vacuum pipeline and a vacuum chamber collimation vacuum pipeline), the two outlet pipelines of one deflection magnet are respectively used on the two deflection magnets under the condition of not changing the structure, and the two deflection magnets are powered on or not powered on, wherein, the vacuum chamber outlet vacuum pipeline is used for a beam current channel when the power is on, the vacuum chamber collimation vacuum pipeline is used for a beam current channel when the power is off, and the vacuum chamber outlet vacuum pipeline of one deflection magnet and the vacuum chamber inlet vacuum pipeline of the next deflection magnet are connected through a flange, so that after the last powered beam current flows out of the vacuum chamber outlet vacuum pipeline, the beam current turns to the next vacuum chamber collimation vacuum pipeline without the powered deflection magnet, therefore, beam collimation of the previous electrified beam pipeline is measured by using beam collimation of the next unpowered beam vacuum pipeline.

Based on the principle of the invention, the invention designs a beam collimation method for debugging beams of an accelerator beam line.

A beam collimation method for debugging beams of an accelerator beam line is disclosed, as shown in figure 1, the beam line leads the beams out of an accelerator 1 and transmits the beams to each application terminal through a beam line 3; more than 2 accelerator beam line deflection magnet assemblies 2 which are continuously arranged are arranged at each turning position on a beam line, and the more than 2 accelerator beam line deflection magnet assemblies apply a turning force to the beams passing through the turning positions to deflect beam tracks; the accelerator beam line deflection magnet assembly comprises a beam line magnet 2-0 of a sector, magnetic shielding plates 2-9 corresponding to two straight side surfaces of a beam line magnet beam inlet and a beam line magnet beam outlet of the sector, a vacuum chamber inlet vacuum pipeline 2-7-1 arranged on the same side of the beam line inlet magnetic shielding plate, a vacuum chamber outlet vacuum pipeline 2-7-3 and a vacuum chamber collimation vacuum pipeline 2-7-2 arranged on the same side of the beam line outlet magnetic shielding plate, and an adjustable support 2-8 arranged at the bottom of the beam line magnet assembly of the sector; the method is characterized by comprising the following steps:

as shown in figure 3 of the drawings,

aligning a vacuum chamber outlet vacuum pipeline of a previous deflection magnet of a beam streamline to a vacuum chamber inlet vacuum pipeline of a next deflection magnet of the beam streamline;

step two, electrifying the previous deflection magnet and not electrifying the next deflection magnet;

measuring the beam collimation of the previous electrified beam pipeline by using the beam collimation of the next unpowered beam vacuum pipeline, thereby measuring the beam offset condition;

and step four, adjusting the size of the energizing current of the accelerator beam line deflection magnet coil according to the beam offset condition.

The specific process of the third step is as follows:

⑴ installing fluorescent screen 2-8 on the end face of the next beam vacuum tube;

the unpowered beam current vacuum pipeline is a vacuum chamber collimation vacuum pipeline;

⑵ the collimation reference of phosphor screen is the center line of vacuum chamber collimation vacuum pipe;

⑶ the direction of the beam from the previous electrified deflection magnet to the next unpowered deflection magnet is a straight line direction, and the beam flows from the vacuum pipeline at the outlet of the previous electrified vacuum chamber to the collimated vacuum pipeline of the next unpowered vacuum chamber and hits the fluorescent screen of the collimated vacuum pipeline of the next vacuum chamber;

⑷ the beam offset on the screen of the vacuum chamber collimated vacuum tube is measured and used as the beam offset of the exit vacuum tube of the last energized beam vacuum chamber.

The specific process of the step four is as follows:

⑴ if the actual movement direction of the beam deviates from the theoretical movement direction of the beam when the coil is not electrified, the current applied to the coil is reduced, that is, the magnetic field generated by the accelerator beam line deflection magnet is reduced;

⑵ when the actual movement direction of the beam deviates to the left side along the beam direction relative to the theoretical movement direction of the beam when the coil is not electrified, the current electrified by the coil is increased, that is, the magnetic field generated by the accelerator beam line deflection magnet is increased.

And the vacuum chamber outlet vacuum pipeline of the previous deflection magnet in the step one is butted with the vacuum chamber inlet vacuum pipeline of the next deflection magnet through flanges.