A novel comparison of Møller and Compton electron-beam polarimeters
A novel comparison of Møller and Compton electron-beam polarimeters
复制标题
穆勒和康普顿电子束旋光计的新颖比较
DOI：
10.1016/j.physletb.2017.01.026
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发表时间：
2016
影响因子：
4.4
通讯作者：
S. Zhamkotchyan
中科院分区：
文献类型：
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作者：
J. Magee;A. Narayan;D. Jones;R. Beminiwattha;J. Cornejo;M. Dalton;W. Deconinck;D. Dutta;D. Gaskell;J. Martin;K. Paschke;V. Tvaskis;A. Asaturyan;J. Benesch;G. Cates;B. Cavness;L. Dillon;G. Hays;J. Hoskins;E. Ihloff;R. Jones;P. King;S. Kowalski;L. Kurchaninov;L. Lee;A. McCreary;M. Mcdonald;A. Micherdzińska;A. Mkrtchyan;H. Mkrtchyan;V. Nelyubin;S. Page;W. Ramsay;P. Solvignon;D. Storey;W. Tobias;E. Urban;C. Vidal;B. Waidyawansa;P. Wang;S. Zhamkotchyan
我们已经进行了一个新的比较基于穆勒和康普顿散射的电子束偏振计。在Jefferson实验室的Hall-C实验中，在低束流（< 5 μ A）下进行了一系列电子束极化测量。这些低电流测量值与康普顿旋光计的常规高电流（180 μ A）操作相对应。所有的测量结果被发现是一致的实验不确定度为1%或更少，表明电子极化并不显着依赖于束流。这一结果使人们对在低束流条件下进行的穆勒测量应用于在高束流条件下进行的物理实验的普遍做法有了信心。基于独立物理过程的两种偏振测量技术之间的一致性为未来需要低于1%精度的偏振测量精度的不对称测量设定了重要基准。
We have performed a novel comparison between electron-beam polarimeters based on Møller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents (< 5 μ A) during the Q weak experiment in Hall-C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 μ A) operation of the Compton polarimeter. All measurements were found to be consistent within experimental uncertainties of 1% or less, demonstrating that electron polarization does not depend significantly on the beam current. This result lends confidence to the common practice of applying Møller measurements made at low beam currents to physics experiments performed at higher beam currents. The agreement between two polarimetry techniques based on independent physical processes sets an important benchmark for future precision asymmetry measurements that require sub-1% precision in polarimetry.