BEAM-LINE DIAGNOSTICS AT THE FRONT END TEST STAND (FETS), RUTHERFORD APPLETON LABORATORY, OXFORDSHIRE, UK
BEAM-LINE DIAGNOSTICS AT THE FRONT END TEST STAND (FETS), RUTHERFORD APPLETON LABORATORY, OXFORDSHIRE, UK
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英国牛津郡卢瑟福阿普尔顿实验室前端测试台 (FETS) 的束线诊断
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Letchford
中科院分区：
文献类型：
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作者：
G. Boorman;S. Gibson;S. Lawrie;A. Letchford
场效应管的H离子源和束线需要连续监测束流和束位置。电流互感器Transformer环形线圈将测量射束电流，射束位置监测器（BPM）将确定射束位置。离子源以50 Hz的速率提供脉冲，电流高达60 mA，每个脉冲长2 ms，并且由射频四极（QF）加速结构施加324 MHz的微聚束结构。将在快速示波器上采集环形线圈输出。正在考虑两种BPM设计（短路带状线或按钮型），但两种类型的处理类似，并且已经设计，并进行了模拟测量。每个BPM使用四个拾波器，频率为324 MHz，使用RF电子设备将其混合到10.125 MHz的中频。然后，在40.500 MHz下对所得信号进行数字化，并在FPGA中进行处理，以产生每个BPM位置处的光束位置和相位，精度优于100 μm和0.05 rad。在每个脉冲时，将通过EPICS服务器提供来自环形线圈和BPM的测量结果。
The H ion source and beam-line at FETS will require the beam current and beam position to be continually monitored. Current transformer toroids will measure the beam current and beam position monitors (BPMs) will determine the beam position. The ion source delivers pulses at a rate of 50 Hz with a current up to 60 mA, each pulse is 2 ms long, and a 324 MHz micro-bunch structure imposed by the radio frequency quadrupole (RFQ) accelerating structure. The toroid outputs will be acquired on a fast oscilloscope. Two BPM designs are under consideration (shorted strip-line or button type) but the processing for both types is similar and has been designed, with simulated measurements made. Each BPM uses four pickups, at a frequency of 324 MHz, which are mixed using RF electronics to an intermediate frequency of 10.125 MHz. The resulting signals are then digitized at 40.500 MHz and processed in an FPGA to produce the position and phase of the beam at each BPM location, with a precision of better than 100 μm and 0.05 rad. The measurements from the toroids and BPMs will be available via EPICS servers at every pulse.