A novel current mode operating beam counter based on not preamplified HPDs
A novel current mode operating beam counter based on not preamplified HPDs
复制标题
一种基于非预放大 HPD 的新型电流模式操作光束计数器
DOI：
10.1016/s0168-9002(01)02033-2
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发表时间：
2002
影响因子：
1.4
通讯作者：
M. Marchesotti
中科院分区：
文献类型：
--
作者：
M. Fujiwara;M. Marchesotti
描述了一种新的系统，用于监测长度为≃250 ns的̄1.2×107反质子(p≃S)聚束的强度和稳定性，并测量其在Penning陷阱中的捕获效率。该系统从衰减器中部分光束的湮灭中寄生地检测到介子。六个塑料闪烁体已经从一侧耦合到六个没有前置放大器并以电流模式工作的接近聚焦的HPD。该装置工作在雅典娜磁铁的杂散磁场中，效率不损失；增益范围从零到几千变化，精度优于0.1%，动态范围大于8个数量级。线性度和稳定性已被测量到100nC的电荷响应，对应于束流完全倾倒。光束计数器已经用两种不同且独立的方式进行了校准，得到了一致的结果。
A novel system to monitor the intensity and the stability of a bunched beam of ≃1.2×107antiprotons ( p ̄ s ) with a length of ≃250 ns (FWHM) and to measure its trapping efficiency in a Penning trap is described. This system operates parasitically detecting the pions from the annihilation of part of the beam in a degrader. Six plastic scintillators have been coupled from one side to six proximity focused HPDs without preamplifiers and operating in current mode. This device works in the stray field of the ATHENA magnet with no loss of efficiency; the gain can be varied from zero to a few thousands with a precision better than 0.1% and the dynamic range is larger than 8 orders of magnitude. Linearity and stability have been measured up to charge responses of 100 nC , corresponding to the beam completely dumped. The beam counter has been calibrated in two different and independent ways giving consistent results.