论文标题
低能RHIC电子冷却器增强器腔中串扰效应的校正
Correction of crosstalk effect in the low energy RHIC electron cooler booster cavity
论文作者
论文摘要
低能相对论重型离子对撞机（RHIC）电子冷却器（LEREC）旨在将1.6 MeV传递至2.6 MeV电子束，RMS DP/P小于5E-4。超导射频（SRF）增强腔是LEREC中的主要加速成分。它是一个0.4个细胞腔，在2 K下运行，最大能量增益为2.2 meV。它是从实验能量恢复的LINAC（ERL）光电模枪中修改的，因此具有基本功率耦合器（FPC），拾音器（PU）耦合器（现场探针）和HOM耦合器在腔的同一侧。 FPC和PU之间的直接电容耦合称为串扰效应，结合了微音失调，可以诱导超过LEREC总能量扩散需求的闭环电压波动。对该空腔中的串扰效应进行了建模，模拟和测量，并提出了校正方法并证明抑制电压波动，以便可以满足能量扩散需求。
The Low Energy Relativistic Heavy Ion Collider (RHIC) electron Cooler (LEReC) is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with rms dp/p less than 5e-4. The superconducting radiofrequency (SRF) Booster Cavity is the major accelerating component in LEReC. It is a 0.4 cell cavity operating at 2 K, providing a maximum energy gain of 2.2 MeV. It is modified from an experimental Energy Recovery Linac (ERL) photocathode gun, and thus has fundamental power couplers (FPCs), pickup (PU) couplers (field probes) and HOM coupler close to each other on the same side of the cavity. Direct capacitive coupling between the FPC and PU, called the crosstalk effect, combined with microphonic detuning, can induce closed loop voltage fluctuations that exceed the total energy spread requirement of LEReC. The crosstalk effect in this cavity is modelled, simulated, and measured, and A correction method is proposed and demonstrated to suppress the voltage fluctuation so that energy spread requirement can be met.
