微波-电子康普顿背散射测量高能束流能量
High energy beam energy measurement with microwave-electron Compton backscattering
摘要：
为了保证希格斯玻色子质量的准确测量，环形正负电子对撞机（CEPC）电子束能量测量的不确定度必须小于10 $\mathrm{MeV}$。为了简化能量测量系统，提出了一种利用微波-电子康普顿散射γ射线能量分布的康普顿边拟合的新方法。用我们的方法，能量测量的不确定度为6 $\mathrm{MeV}$的电子能量的$120\mathrm{GeV}$在Higgs模式。在该系统中，伽马探测的能量分辨率需要达到$10^{-4}$。因此，只有高纯锗（HPGe）探测器才能满足这一要求。在正面碰撞模式下，初始光子应该是波长为3.04厘米的微波光子。具有选定的${TM_{010}}$模式的圆柱形谐振腔用于传输微波。在微波电子康普顿背散射后，散射光子和同步辐射背景透射屏蔽结构，然后被同步辐射应用的束线末端的HPGe探测器检测到。空腔侧壁中的孔半径约为$1.5\mathrm{mm}$，以允许电子束通过。计算机模拟技术（CST）软件的结果表明，孔半径对腔场的影响可以忽略不计。谐振频率的变化可以很容易地通过微调腔的尺寸来校正。
英文摘要：
The uncertainty of the energy measurement of the electron beam on circular electron positron collider (CEPC) must be smaller than 10$\mathrm{MeV}$ to make sure the accurate measurement of the mass of the Higgs boson. In order to simplify the energy measurement system, a new method is proposed by fitting the Compton edge of the energy distribution of the gamma ray from a microwave-electron Compton scattering. With our method, the uncertainty of the energy measurement is 6$\mathrm{MeV}$ for the electron energy of $120\mathrm{GeV}$ in the Higgs mode. In this system, the energy resolution of the gamma detection needs to reach $10^{-4}$. Therefore, only the high-purity germanium (HPGe) detector can meet the critical requirement. In a head-on collision mode, the initial photons should be microwave photons with the wavelength of 3.04 centimeters. A cylindrical resonant cavity with selected ${TM_{010}}$ mode is used to transmit microwaves. After the microwave-electron Compton backscattering, the scattered photons and the synchrotron-radiation background transmit a shielding structure and then are detected by a HPGe detector at the end of the beam line of the synchrotron-radiation applications. The hole radius in the side wall of the cavity is about $1.5\mathrm{mm}$ to allow the electron beam passing through. The results of the computer simulation technology (CST) software shows that the influence of the hole radius on the cavity field is negligible. The change of the resonance frequency can be easily corrected by fine-tuning the cavity size.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
