Identification of failure and vacuum destruction of an ion accelerator using a maintenance linear accelerator Wang Wei Chen Weiping (Fieldless Research Institute, Third Affiliated Hospital, Third Military Medical University) An electron gun, an accelerating tube, and a target are important components of an accelerator. They must work in a vacuum. The degree is in the environment of 10-7 tons or more, and the ion pump is used to maintain the high vacuum state in the gun, target and accelerating tube, so its operating state is closely related to the vacuum degree of the whole machine.

In this paper, the Accor Accelerator is used as an example to introduce the identification method of the failure of the linear accelerator ion pump and the vacuum damage. This accelerator has two ion pumps, an electron gun, and a target. Accelerator vacuum damage, in general, is manifested in the monitoring of ion pump information. The accelerator can determine the degree of vacuum by observing the item reading of the gun and target (in the maintenance mode, the computer gives a few hundred Item values). Under normal circumstances, its indication should be -6.0 or less, that is, -6.2, -63 (6.1 indicates that the degree of vacuum is approximately equal to 107 乇), and so on. When the indication is above -5.0, it means that the vacuum is not good, but sometimes it is a false phenomenon that the ion pump fails. So how do we identify them, I summed up the following experience in the actual handling of this failure: 1 to determine whether the vacuum is damaged with the gun, target ion pump to distinguish the value of the reading.

For example, if one end is below -6.0, and the other end is not normal, the value is very high, such as -3.5. This indicates that the illusion is very likely; if the reading at one end is slightly greater than -6.0, such as -5.9 or -5.8, and the other The reading at one end is slightly smaller than -5.0, such as -5.1 or so, indicating a high vacuum. That is, if a vacuum leaks, either at the gun end or at the target end (the accelerating pipe itself has very little leakage), the ion pump with no leaking end will be affected by the leaking end, and its reading will be slightly higher. If only one of the ion pumps fails and the vacuum does not leak, the normal ion pump will not be affected much.

The temperature method is used to judge: Under normal conditions, the temperature of the ion pump housing is basically the same as the room temperature. If the temperature of the ion pump housing is abnormally high, it indicates that the load is large and there is a leak. If the temperature is too high, turn off the ion pump immediately to prevent further damage to the ion pump and its power source.

Use the interchange method to judge: Reverse the high-voltage output cables of the two ion pump power supplies. If the vacuum indication on the monitor does not change after the alignment, there is no problem with the vacuum and it may monitor the circuit.

Use the partition method to judge: The high-voltage cable of the ion pump at the end of the monitor display is disconnected from the ion pump. At this time, the monitor indicates. If it is still abnormal, it means that vacuum damage is unlikely and it should be a false phenomenon.

2 False phenomenon There are often the following types of ion pump failures, and there is a very large current between the positive and negative electrodes. In this case, tapping the ion pump housing with a mallet, the indication of the vacuum on the monitor will fluctuate. If the temperature of the ion pump housing does not increase at this time, the high voltage cable is unplugged at the end of the ion pump. The indication should return to normal.

Ion pump high-voltage cable leakage or breakdown. Unplug the high-voltage cable vacuum indicator at the end of the ion pump power supply is normal, and re-inserted high-voltage cable at the end of the ion pump is still higher than the normal value, this situation can be used to determine the insulation resistance of the high-voltage cable megger.

Ion pump power is bad. The high-voltage cables of the two ion pump power supplies can be reversed, if there is no change in the vacuum indication on the monitor, indicating that the power supply has a problem.

Ion pump detection circuit problem. The voltmeter can be used to directly measure the vacuum detection circuit output. After the high-voltage cable is unplugged, the absolute value of its voltage should pass through the above method. It is believed that the fault can be identified and the problem can be solved quickly.

(Repaired) Phillips SL-18 Accelerator Coupler Fault Repair Li Zhongqiang Li Gang Wu Tongwen (Second Xiangya Hospital, Central South University, Changsha 410011) The Philips SL-18 Linear Accelerator is a new generation of digital high energy linear accelerator with two types of radiation. Beams: X-ray (6MV, 15MV), and E-line (4, 6, 8, 10, 12, 15 and 18 MeV). Because the machine performs target positioning and monitoring of X-rays and electronic line conversions through a linkage, an example of faults occurring during the conversion between the X-ray and the electronic line is described as follows: 1 Failure phenomenon The front desk is in the X-ray state after power-on. The information bar speed indicator can not be normally beamed, but can be normally beamed when converted to an electronic line.

Chk462 error message shows that the target has errors in the process of moving. There are three possibilities. First, the target position is already in place. It is a false error in the detection system. The second is that the detection system is normal and the target position is not in the X-ray state. In place. Third: The target is not in place, and the detection system also fails at the same time. T0igeUype400 and TargetChk462 monitor the position of the target. Targettype400 has a value of 6 in the electronic line state, a value of 3 in the X-ray state, and a value of 7 in the motion of the target. This value is expressed by two microswitches on the flight tube driver. The flight tube is in contact with a coupler and the TargeLChk462 parameter is determined by the readout of the potentiometer on the coupler. The setting value of Week Chk462 is 1786, and the float cannot exceed 30. It can be seen that this value has exceeded the allowable range.

2 troubleshooting First remove the head jacket to see the flight tube drive part, check the two micro-switches and found that one of the micro-switch response is not sensitive, so it will be replaced. After the boot, the fault still exists. The machine was further disassembled to see the flight tube section. At this time, it was found that the shaft of the flight tube and the contactor was tilted forward and downward.

The machine is used for punching connecting holes at both ends of the scaffold vertical pole, it can punch four holes at one time, and it can also ensure the accuracy of the hole position.

Description of Kwikstage scaffolding automatic Punching Machine

Pipe quantity: punch one pipe at one time

Guarantee time: 1 year

MOQ: 1 set

OEM service: offered

Payment: T/T. L/C

Delivery: Tianjin port

FAQ:

Q: Can you customize the machine according to our workpiece requirement?

A:Yes, we can design the machine after you give us the technical drawing.

Q: How about payment terms?

A: 30% TT as deposit, 70% TT paid before shipment or against B/L copy.

Q: Installation and commissioning?

A: We will send our engineer for installation and commissioning

Q: Do you have some videos to show how the machine works?

A: Yes, we can provide some videos for reference.

Kwikstage Scaffolding Automatic Punching Machine

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