Electron Cloud Buildup Characterization Using Shielded Pickup Measurements and Custom Modeling Code at CESRTA
Electron Cloud Buildup Characterization Using Shielded Pickup Measurements and Custom Modeling Code at CESRTA
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CESRTA 使用屏蔽拾音器测量和自定义建模代码来表征电子云堆积
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Sikora
中科院分区：
文献类型：
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作者：
J. Crittenden;J. Sikora
康奈尔电子储存环测试加速器的实验计划包括调查电子云的积累，在定制的真空室中应用各种缓解技术。其中有两个1.1米长的部分对称地位于东部和西部弧区。这些腔室配备有屏蔽直接光束感应信号的拾取检测器。他们探测到云电子通过腔室顶部直径18毫米的小孔迁移。数字化示波器用于记录信号，提供云发展的时间分辨信息。碳涂层，氮化钛涂层和未涂层的铝室进行了测试。电子和正电子束的2.1，4.0和5.3 GeV的各种聚束人口和间距的步骤4和14纳秒已被使用。在这里，我们报告的结果，从ECLOUD建模代码，突出这些测量的敏感性，确定云建设的物理现象，如光电子生产的方位角和能量分布，和二次产量参数，包括真正的二次，再扩散，和弹性屈服值。
The Cornell Electron Storage Ring Test Accelerator experimental program includes investigations into electron cloud buildup, applying various mitigation techniques in custom vacuum chambers. Among these are two 1.1-m-long sections located symmetrically in the east and west arc regions. These chambers are equipped with pickup detectors shielded against the direct beam-induced signal. They detect cloud electrons migrating through an 18-mm-diameter pattern of small holes in the top of the chamber. A digitizing oscilloscope is used to record the signals, providing time-resolved information on cloud development. Carbon-coated, TiN-coated and uncoated aluminum chambers have been tested. Electron and positron beams of 2.1, 4.0 and 5.3 GeV with a variety of bunch populations and spacings in steps of 4 and 14 ns have been used. Here we report on results from the ECLOUD modeling code which highlight the sensitivity of these measurements to the physical phenomena determining cloud buildup such as the photoelectron production azimuthal and energy distributions, and the secondary yield parameters including the true secondary, re-diffused, and elastic yield values.