Dynamic distortions in the HARP TPC: observations, measurements, modelling and corrections
Dynamic distortions in the HARP TPC: observations, measurements, modelling and corrections
复制标题
HARP TPC 中的动态失真：观察、测量、建模和校正
DOI：
10.1088/1748-0221/4/11/p11014
复制
发表时间：
2009
影响因子：
1.3
通讯作者：
I. Tsukerman
中科院分区：
文献类型：
--
作者：
A. Bagulya;A. Blondel;S. Borghi;G. Catanesi;P. Chimenti;U. Gastaldi;S. Giani;V. Grichine;V. Ivanchenko;D. Kolev;J. Panman;E. Radicioni;R. Tsenov;I. Tsukerman
HARP实验是为了研究1.5GeV/c-15GeV/c能量范围内质子-核碰撞中强子的产生而设计的。实验由两台光谱仪、一个前向偶极光谱仪和一个大角度螺线管光谱仪组成。在大角度光谱仪中，主要的跟踪和粒子识别是由圆柱形时间投影室(TPC)执行的，这一缺点在后面的分析中得到了解决。在这篇文章中，我们讨论了TPC中位置测量的时间相关(动态)失真的影响，这是由于加速器泄漏期间腔内离子电荷的积累造成的。通过模型和实验对这些现象进行了研究，并提出了一种修正方法。通过弹性散射反应中的反冲质子，通过实验测量了随时间变化的扭曲的影响，其中轨迹坐标是根据简单的运动学考虑而精确预测的。用现象学方法模拟了正离子云的动力学和场笼系统的静电学，提供了对特征的理解。利用弹性散射数据，开发了一种通用的校正程序，并将其应用于所有数据设置。在应用动态失真校正之后，校正后的数据具有与没有动态失真的数据相同的性能。我们描述了唯象模型、与测量结果的比较、失真校正方法以及用实验数据得到的结果。
The HARP experiment was designed to study hadron production in proton-nucleus collisions in the energy range of 1.5 GeV/c–15 GeV/c. The experiment was made of two spectrometers, a forward dipole spectrometer and a large-angle solenoid spectrometer. In the large-angle spectrometer the main tracking and particle identification is performed by a cylindrical Time Projection Chamber (TPC) which suffered a number of shortcomings later addressed in the analysis. In this paper we discuss the effects of time-dependent (dynamic) distortions of the position measurements in the TPC which are due to a build-up of ion charges in the chamber during the accelerator spill. These phenomena have been studied both by modelling and by experiment, and a correction procedure has been developed. The effects of the time-dependent distortions have been measured experimentally by means of recoil protons in elastic scattering reactions, where the track coordinates are precisely predictable from simple kinematical considerations. The dynamics of the positive ion cloud and of the electrostatics of the field-cage system have been modelled with a phenomenological approach providing an understanding of the features. Using the elastic scattering data a general correction procedure has been developed and applied to all data settings. After application of the corrections for dynamic distortions the corrected data have a performance equal to data where the dynamic distortions are absent. We describe the phenomenological model, the comparison with the measurements, the distortion correction method and the results obtained with experimental data.
入射π介子束在核目标上大角度产生带电π介子
影响因子：
3.1
作者：
Apollonio M
通讯作者：
Apollonio M