APT直线加速器尾流场效应分析
Wake Field Effect Analysis in APT Linac
摘要：
1.7 GeV 100 mA连续波质子直线加速器目前正在为加速器生产氚（APT）项目设计。APT直线加速器包括正常传导（低于211 MeV）和超导（SC）部分。高电流导致对允许的束流损耗（<1 nA/m）的严格限制，这需要仔细分析所有可能的损耗源。虽然尾场效应通常被认为是可以忽略不计的质子直线加速器，我们研究这些影响的APT排除潜在的问题，在这样一个高电流。损耗因子和谐振频谱的各种不连续性的真空室的调查，无论是分析和使用2-D和3-D的模拟代码与一个单一的束，以及与许多束。我们的主要结论是，唯一值得注意的影响是HOM加热的5细胞SC腔。然而，它具有可接受的水平，此外，将由HOM耦合器处理。
英文摘要：
The 1.7-GeV 100-mA CW proton linac is now under design for the Accelerator Production of Tritium (APT) Project. The APT linac comprises both the normal conducting (below 211 MeV) and superconducting (SC) sections. The high current leads to stringent restrictions on allowable beam losses (<1 nA/m), that requires analyzing carefully all possible loss sources. While wake-field effects are usually considered negligible in proton linacs, we study these effects for the APT to exclude potential problems at such a high current. Loss factors and resonance frequency spectra of various discontinuities of the vacuum chamber are investigated, both analytically and using 2-D and 3-D simulation codes with a single bunch as well as with many bunches. Our main conclusion is that the only noticeable effect is the HOM heating of the 5-cell SC cavities. It, however, has an acceptable level and, in addition, will be taken care of by HOM couplers.
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