用HJET偏振计测量EIC的${}^3\rm{He}$光束偏振的可能性
On the possibility of measuring the polarization of a ${}^3\rm{He}$ beam at EIC by the HJET polarimeter
摘要：
未来电子离子对撞机（EIC）对强子偏振测量的要求包括绝对氦离子（${}^3\text{He}$，$h$）束流偏振的测量，其系统不确定度优于$σ^\text{syst}_P/P\lesssim1\%$。在这里，我们考虑了一种可能性，利用极化原子氢气射流靶（HJET）的精确测量的偏振的$\sim$ 100 GeV/n的氦离子束。HJET用于确定相对论重离子对撞机上质子束的绝对极化，其精度约为$δ^\text{syst}P/P\sim0.5\%$。调整EIC氦离子束的HJET方法的潜在问题包括：（i）需要知道$p^\uparrow{h}$和$h^\uparrow{p}$分析功率$A_\text{N}^{ph}(t)/A_\text{N}^{hp}(t)$与高精度的比率，（ii）可能的束${}^3\text{He}$分裂，和（iii）在10 ns束间距束操作。初步分析结果表明，上述问题是可以克服的，用HJET测量氦离子束的绝对偏振可以达到要求的精度。
英文摘要：
The requirements for hadron polarimetry at the future Electron Ion Collider (EIC) include measurements of the absolute helion (${}^3\text{He}$, $h$) beam polarization with systematic uncertainties better than $σ^\text{syst}_P/P\lesssim1\%$. Here, we consider a possibility to utilize the Polarized Atomic Hydrogen Gas Jet Target (HJET) for precision measurement of polarization of the $\sim$100 GeV/n helion beam. HJET, which serves to determine absolute proton beam polarization at the Relativistic Heavy Ion Collider, provides the accuracy of about $δ^\text{syst}P/P\sim0.5\%$. Potential problems for adapting the HJET method for the EIC helion beam include (i) necessity to know the ratio of $p^\uparrow{h}$ and $h^\uparrow{p}$ analyzing powers $A_\text{N}^{ph}(t)/A_\text{N}^{hp}(t)$ with high precision, ({ii) possible beam ${}^3\text{He}$ breakup, and (iii) operation in a 10 ns bunch spacing beam. Preliminary results of an analysis discussed here indicate that the listed problems can be overcome and the helion beam absolute polarization can be measured by HJET with the required accuracy.
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