Due to the heat generation of the turbomolecular pump is very low, it won't lead to an obvious increase of the cooling water's temperature. So the step that connects the cooling water of  turbomolecular pump with the cryogenic pump's in series is feasible. 

    There are several accidents that the vacuum was suddenly lost with the sustainment of both cryogenic pump and ionization pump. The gas pressure unexpectedly increased from 7E-5Pa to 1E-1Pa. The ionization pump then was self-protected. The cryogenic pump didn't stopp working but the surface was covered by frost.

    Now it is supposed that since the operation...

Without the capacitance guage indication of the pressure, the silane's glow discharge plating continues for about 30 minutes. During the process, the leakage of the pipeline for entering gas led to a small-scale fire. The fire was controlled by the solid carbon dioxide extinguisher. After the silicification, the microwave preionization ohmically heated discharge continues but no better results were...

From this process, something new has been discovered. First of all, the H-alpha ray peak may indicate the collision between plasma and the wall. Secondly, a wider current platform has been gained by adjusting the discharge voltage of the vertical field’s two group of capacitors.

 

It has been discovered that vertical field contributes much to the plasma current. As a result, it is urgent to control the vertical field. A non-faradic resistance folded from a stainless steel piece which has a length of 90mm, a width of 100mm and a thickness of 0.6mm has been connected in as the sampling current for the vertical field control circuit. By calculating, the value of the resistance...

The system began to fail to operate from a moment in this afternoon. When the cryogenic pump was turned off at about 5 o’clock this afternoon, it is found out that the temperature of the water is so high that even can burn our hands. Only the blower was working to lower the temperature at that moment.

 

When the probes were connected with the vacuum vessel, the pressure of the vacuum stayed at a value of 2E-3Pa. Even if the valve was shut down, the pressure still fell at a very low speed, which resulted in the continuous operating of the turbomolecular pump. However, it was discovered that the show value of the barometer declined from 8~9E-5Pa to 5E-5Pa. Meanwhile the current of the ionization pump...

The false behavior of the power supply of the electrodes seemed due to a possible reason that the momentary charge led to the output error of the voltage comparator 339. When the big contactors were replaced by the purified power supply, the false behavior was removed. But actually this is not the ultimate method to solve the problem. At that moment, the signal of the plasma current was credible....

Although there is no evidence to prove the existing of leakage, the pressure maintained the value of 1.4E-3Pa, which was considered at the value of 9E-5Pa before installation. It seemed that enamel-insulated wire and Teflon became the source of gas.

Use the simplest single-chip circuit to get the ideal result as soon as possible.

 In the condition of the radiator working normally, the compressor of the cooling water system no longer starts up when the circular water system is unloaded, which is much better when compared with the former condition that even if the circular water system is unloaded, the duty cycle of the compressor in water system can be up to 50%. (Obviously, the increase of equilibrium temperature is also...

 It was found out that the pressure of the cryogenic pump was 0.4Pa, the one of the vacuum was 3.6Pa. The surface of the cryogenic pump was covered with frost and the pump was still operating. By judging from the voice and the pressure, the compressor and expander were working normally. The temperature of the cold head was still 423K. The ionization pump has been protected. The circular water...

From the mass spectrum analysis, it was found out that basis of the vacuum is water. Cover a quilt with the surface of the tokamak when drying the vacuum.

 A refrigerator is used to cool the turbomolecular pump. The circular water system, which originally did this job, now is operating on cooling the compressor. Till now it is working normally. The temperature of the cryogenic pump has declined to 12~13K.

   The compressor of the cryogenic pump now is cooled by an integration system of copper tube heat interchanger and a diving pump originally used in a fish tank. When the circular water in the cryogenic pump has the temperature of 22 centigrade degree, the counterpart of the exit of the compressor is balanced at 42.5 degree.
   After 2 hours' cooling, the temperature of the...