【摘要】 本文介绍了与BNI制造的快速阀配套使用的快速阀传感器的设计、制造及使用情况。在模拟真空事故的条件下,测试了传感器的主要性能及响应时间。更多还原

【Abstract】 A fast valve sensor, which matches with BNL-designed fast valve, has been designednd constructed to protect the vacuum of BEPC（Beijing Electron-Positron Collider） electron astorage ring against sudden vacuum failure during synchrotron radiation experiments.The fast valve sensor consists of a vacuum pressure detector and a controller, A twoliter/see ion pump is utilized as the vacuum pressure detector because its electrodes are robust enough to withstand poor vacuum. The current drawn by this detector is proportional to pressures throughout the range between 10^-3 and 10^-6 Torr. The detectors may be placed close to the sites of poteutial break in the beam line vacuum envelope, for example, adjacent to the Be windows and the mirror boxes. A high DC voltage of 3kV in thee on troller is applied bv a sensing resistor Rs across the detector electrodes to obtain a voltage signal corresponding to the ion current. The voltage signal is compared with a preset（?）able level, which corresopnds to an over-pressure trip point at the comparator. The presettable level si adjustable between 1×10^-3 and 5×10^-6 Torr by a potentiometer. Finally, the output of the comparator is fed to the control circuit of the fast valve. If a high pressure is detected, the output of the comparator is sent to the fast valve control circuit, causing the fast valve to be automatically closed. At this time, the controller aiso automatically turns off its high DC voltage power supply. The response time of the controller is 2.38 ms.更多还原