Determination of target thickness and luminosity from beam energy losses
Determination of target thickness and luminosity from beam energy losses
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DOI：
10.1103/physrevstab.11.052801
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发表时间：
2008-01
影响因子：
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通讯作者：
H. Stein;M. Hartmann;I. Keshelashvili;I. Keshelashvili;Y. Maeda;C. Wilkin;S. Dymov;A. Kacharava;A. Kacharava;A. Khoukaz;B. Lorentz;R. Maier;T. Mersmann;S. Mikirtychiants;S. Mikirtychiants;D. Prasuhn;R. Stassen;H. Stockhorst;H. Ströher;Yuri Valdau;Yuri Valdau;P. Wüstner
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文献类型：
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作者：
H. Stein;M. Hartmann;I. Keshelashvili;I. Keshelashvili;Y. Maeda;C. Wilkin;S. Dymov;A. Kacharava;A. Kacharava;A. Khoukaz;B. Lorentz;R. Maier;T. Mersmann;S. Mikirtychiants;S. Mikirtychiants;D. Prasuhn;R. Stassen;H. Stockhorst;H. Ströher;Yuri Valdau;Yuri Valdau;P. Wüstner
存储环的旋转离子束反复通过薄靶，由于靶中的能量损失，引起旋转频率的漂移。由于频移与束-靶重叠成正比，它的测量提供了在实验中确定靶厚度和相应光度的可能性。在COSY-J-UICH加速器上，用能量为2.65GeV的内部质子束，用Anke能谱仪和氢团簇喷射靶研究了这种效应。仔细研究了可能的误差来源，特别是由环中残留气体的影响引起的误差，结果精度优于5%。用这种方法测定的光度，结合Anke前向探测器的测量，被用来确定质子-质子弹性散射的截面。将结果与已发表的数据以及相移解的预测进行了比较。讨论了能量损耗法的实用性和局限性。
The repeated passage of a coasting ion beam of a storage ring through a thin target induces a shift in the revolution frequency due to the energy loss in the target. Since the frequency shift is proportional to the beam-target overlap, its measurement offers the possibility of determining the target thickness and hence the corresponding luminosity in an experiment. This effect has been investigated with an internal proton beam of energy 2.65 GeV at the COSY-J\"ulich accelerator using the ANKE spectrometer and a hydrogen cluster-jet target. Possible sources of error, especially those arising from the influence of residual gas in the ring, were carefully studied, resulting in an accuracy of better than 5%. The luminosity determined in this way was used, in conjunction with measurements in the ANKE forward detector, to determine the cross section for elastic proton-proton scattering. The result is compared to published data as well as to the predictions of a phase shift solution. The practicability and the limitations of the energy-loss method are discussed.