Development of shashlik electromagnetic calorimeter for the NICA/MPD
Development of shashlik electromagnetic calorimeter for the NICA/MPD
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DOI：
10.1088/1748-0221/14/06/t06005
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发表时间：
2019-06
影响因子：
1.3
通讯作者：
C. Shen;D. Xiao;Y. Wang;B. Wang;H. Miao;Y. Li;D. Han;I. Tyapkin;Z. Zou
中科院分区：
文献类型：
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作者：
C. Shen;D. Xiao;Y. Wang;B. Wang;H. Miao;Y. Li;D. Han;I. Tyapkin;Z. Zou
JINR NICA 重离子项目的主要目标是对最大重子密度能量区域内核物质的特性进行实验研究。多用途探测器（MPD）是NICA对撞机的探测器之一，它针对重离子碰撞中热致密物质的特性进行了优化，特别是寻找可能的解除限制和/或手性对称恢复相变、临界终点和混合夸克-强子相的表现。电磁热量计（ECal）是MPD的重要组成部分。 MPD-ECal 的特定目标是测量光子和电子的位置和能量。综合考虑高能量分辨率、高分割、到顶点足够大的距离、小莫里哀半径、高磁场和高时间分辨率等因素，选择了shashlik型电磁量热仪。因此该塔由220层铅板和闪烁体板组成，其厚度分别为0.3mm/1.5mm。塔室尺寸为 4×4 cm2。为了减少死区效应，所有塔都应从四个侧面以小角度切割，这将显着提高电子校准件的位置分辨率和性能均匀性。目前，通过蒙特卡罗模拟研究能量沉积、能量分辨率和位置重建。 shashlik Ecal原型机已经建成，宇宙测试结果显示光电子数（Npe）在522左右。通过与之前的ECal实验结果和模拟结果对比，间接认为原型机的能量分辨率达到了5%/√E（GeV）。提高光输出的关键技术正在研究中，并将用于新原型的开发。
The main goal of the NICA heavy-ion program at JINR is an experimental investigation into the properties of nuclear matter within the energy region of the maximum baryonic density. The Multi Purpose Detector (MPD) is one of the detectors at NICA collider, which is optimized for the study on properties of hot and dense matter in heavy-ion collisions and, in particular, the search for a manifestation of possible deconfinement and/or chiral symmetry restoration phase transitions, critical end-point and mixed quark-hadron phase. Electromagnetic calorimeter (ECal) is an important part of MPD . The particular goal of MPD-ECal is to measure position and energy of photons and electrons. Taking all factors (high energy resolution, high segmentation, large enough distance to the vertex, small Moliere radius, high magnetic field and high time resolution) into consideration, a shashlik-type electromagnetic calorimeter is selected. Therefore the tower consists of 220 layers of lead plates and scintillator plates whose thicknesses are namely 0.3mm/1.5mm. The tower cell is 4×4 cm2 in size. To reduce the dead zones effect, all towers should be cut from four sides at small angles, which will significantly improve the position resolution and the performance homogeneity of the ECal. Currently, energy deposition, energy resolution and position reconstruction are studied through Monte Carlo simulations. A prototype of shashlik Ecal has been built and the cosmic test results show that the number of photoelectrons (Npe) is around 522. By comparing with the previous ECal experimental results and simulation results, it is indirectly considered that the energy resolution of the prototype has reached 5%/√E (GeV) . Key technologies to increase light yield are being studied and will be used in the development of new prototypes.