Beam halo monitor using diamond detectors for XFEL/SPRING-8
Beam halo monitor using diamond detectors for XFEL/SPRING-8
复制标题
使用适用于 XFEL/SPRING-8 的金刚石探测器的光束晕监测器
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Y. Asano
中科院分区：
文献类型：
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作者：
H. Aoyagi;T. Bizen;K. Fukami;N. Nariyama;T. Itoga;T. Tanaka;H. Kitamura;Y. Asano
我们一直在开发一种电子束晕监测器，作为保护波荡器永磁体免受辐射损伤的联锁装置。用8 GeV电子束的晕环部分辐照永磁体，磁场起伏永久退化，激光振荡减弱。因此，在机器操作期间需要联锁装置。工作在光导模式的金刚石探测器是电子束传感器的良好候选者。该监视器的优秀特点是脉冲模式操作，以有效地抑制背景噪声。在SPring-8助推同步加速器束流收集器上进行了用金刚石探测头的束晕监测器的束流测试。最小注入电子数约为10 ~ 3 /脉冲，脉冲宽度为0.33nsec，无杂波。信号噪声电平为0.5mV rms。还检查了输出信号在注入光束上的线性度。描述了用金刚石探测器作束晕监测器的可行性。
We have been developing an electron beam halo monitor as an interlock device for protection of undulator permanent magnets against radiation damage. When permanent magnets are irradiated with a halo part of 8GeV electron beam, magnetic fields undulators are degraded permanently and laser oscillation is weakened. Therefore, the interlock device is required during machine operation. Diamond detector, which operates in photoconductive mode, is good candidate for electron beam sensor. The excellent feature of this monitor is pulse mode operation to suppress the background noise efficiently. The beam test of the beam halo monitor using the diamond detector heads has been carried out at the beam dump of the SPring-8 booster synchrotron. Minimum number of injected electron was about 10 3 /pulse, and we observed the pulse length of 0.33nsec FWHM without a preamplifier. The signal noise level is 0.5mV rms. The linearity of output signal on injected beam was also checked. The feasibility of the beam halo monitor equipped with the diamond detectors is described.