无机材料学报 ›› 2013, Vol. 28 ›› Issue (4): 347-357.DOI: 10.3724/SP.J.1077.2013.12480 CSTR: 32189.14.SP.J.1077.2013.12480
• • 下一篇
肖学峰1,2,3, 徐家跃3, 向卫东1
收稿日期:2012-08-03
修回日期:2012-09-14
出版日期:2013-04-10
网络出版日期:2013-03-20
作者简介:肖学峰(1977–), 男, 博士研究生. E-mail: xxf666666@163.com
基金资助:XIAO Xue-Feng1,2,3, XU Jia-Yue3, XIANG Wei-Dong1
Received:2012-08-03
Revised:2012-09-14
Published:2013-04-10
Online:2013-03-20
About author:XIAO Xue-Feng. E-mail: xxf666666@163.com
Supported by:摘要:
双读出量能器是一种全新设计的高能粒子探测装置, 它能同时测量到Cherenkov光和闪烁光, 因而能更全面地获得高能粒子的信息。目前, 双读出量能器主要有三种设计方式: (1)采用石英纤维产生Cherenkov光, 塑料闪烁纤维生成闪烁光; (2)分别以未掺杂的晶体纤维作为Cherenkov辐射体、Ce掺杂的同种晶体纤维作为闪烁体; (3)采用同种闪烁晶体有效分离Cherenkov光和闪烁光。第三种设计可以消除取样涨落、提高量能器的分辨率, 因而备受关注。本文基于第三种设计方式探讨了钨酸铅(PbWO4)、锗酸铋(Bi4Ge3O12)、硅酸铋(Bi4Si3O12)和镥铝石榴石(Lu3Al5O12)四种。闪烁晶体在双读出量能器方面的研究进展和可能的应用。Pr掺杂PWO晶体以及硅酸铋晶体都有可能用于双读出量能器, 而后者由于吸收边比锗酸铋更短, 更易于分离Cherenkov光和闪烁光, 在双读出量能器应用方面显示出明显的优势。稀土离子掺杂有望进一步提高硅酸铋晶体的性能, 开发出更适合双读出应用的闪烁材料。
中图分类号:
肖学峰, 徐家跃, 向卫东. 双读出量能器用闪烁晶体研究进展[J]. 无机材料学报, 2013, 28(4): 347-357.
XIAO Xue-Feng, XU Jia-Yue, XIANG Wei-Dong. Progress on Scintillation Crystals for Dual-readout Calorimeter[J]. Journal of Inorganic Materials, 2013, 28(4): 347-357.
图2 双读出量能器实验探测装置[25]
Fig. 2 Experimental setup of the tests performed on single crystals. The angle θ is negative when the crystal is oriented as drawn here[25]
| Property | PWO | BGO | BSO |
|---|---|---|---|
| Density/(g·cm-3) | 8.28 | 7.13 | 6.80 |
| Radiation length/mm | 9.2 | 11.2 | 11.5 |
| Radiation hardness/rad | 105-106 | 104-105 | 105-106 |
| Decay constant/ns | 2.2(50%),9.9(34%), 39 (16%)-10 | 5.2(2%), 45(9%), 279 (89%)-300 | 2.4(6%), 26(12%), 99 (82%)-100 |
| Peak emission/nm | 430 | 480 | 480 |
| Peak excitation/nm | 325 | 295 | 285 |
| Refractive index, n | 2.20 | 2.15 | 2.06 |
| Light yield, LY(relative) | 5 | 100 | 20 |
| Melting point/℃ | 1123 | 1050 | 1030 |
| Hardness | 3 | 5 | 5 |
| Cleavage | (101) | none | none |
| Hygroscopicity | no | no | no |
| Temperature coefficient/(%·℃-1) | -1.9 | -1.6 | -2.0 |
| Energy loss/MeV | 13.0 | 24.1 | 22.9 |
| Moliere radius/cm | 2.0 | 2.3 | - |
| Energy resolution(662 keV,%) | 15(1GeV) | 16 | 22 |
Table 1 Some relevant properties of PWO, BGO and BSO crystals [13,25,41-43]
| Property | PWO | BGO | BSO |
|---|---|---|---|
| Density/(g·cm-3) | 8.28 | 7.13 | 6.80 |
| Radiation length/mm | 9.2 | 11.2 | 11.5 |
| Radiation hardness/rad | 105-106 | 104-105 | 105-106 |
| Decay constant/ns | 2.2(50%),9.9(34%), 39 (16%)-10 | 5.2(2%), 45(9%), 279 (89%)-300 | 2.4(6%), 26(12%), 99 (82%)-100 |
| Peak emission/nm | 430 | 480 | 480 |
| Peak excitation/nm | 325 | 295 | 285 |
| Refractive index, n | 2.20 | 2.15 | 2.06 |
| Light yield, LY(relative) | 5 | 100 | 20 |
| Melting point/℃ | 1123 | 1050 | 1030 |
| Hardness | 3 | 5 | 5 |
| Cleavage | (101) | none | none |
| Hygroscopicity | no | no | no |
| Temperature coefficient/(%·℃-1) | -1.9 | -1.6 | -2.0 |
| Energy loss/MeV | 13.0 | 24.1 | 22.9 |
| Moliere radius/cm | 2.0 | 2.3 | - |
| Energy resolution(662 keV,%) | 15(1GeV) | 16 | 22 |
图3 电子簇(50 GeV)通过钼掺杂钨酸铅晶体产生信号的平均时间结构, 5% Mo(a)和1% Mo(b)[4]
Fig. 3 Average time structure of the signals from a PbWO4 crystal doped with 5% Mo(a) and 1% Mo(b), generated by 50 GeV electrons[4]
图4 不同浓度钼掺杂钨酸铅晶体的平均时间信号[44]
Fig. 4 Average time structure of the signals from the light traversing a U330 filter for PbWO4 crystals with different levels of Mo doping[44]
图5 BGO晶体的Cherenkov光和闪烁光时间结构信号强度[12]
Fig. 5 The time structure of a typical shower signal measured in the BGO em calorimeter equipped with a UV filter. The UV BGO signals were used to measure the relative contributions of scintillation light (gate 2) and Cherenkov light (gate 1)[12]
图7 BSO和 BGO晶体(180 GeV)的时间结构信号对比[25]
Fig. 7 Average time structure of the signals from light generated by 180 GeV pions traversing the BSO and BGO crystals at θ=30°, and transmitted by the U330 filter[25]
图8 BSO和BGO晶体的发射谱吸收谱的对比[25]
Fig. 8 Emission and absorption spectra (left-hand scale) of the BSO and BGO crystals, and the transmission curve of the U330 and UG11 filters (right-hand scale)[25]
| Crystal | Dopants | Attenuation constants | Attenuation of Cherenkov light | Intensity of Cherenkov light /mV | Separation the scintillation and Cherenkov light |
|---|---|---|---|---|---|
| PWO | Un-doped | 9.7 ns | — | — | No separation |
| 1%Mo | 26.3 ns | Reducing with Mo concentration decreasing | 115 | Good separation | |
| 5%Mo | 26.3 ns | 86 | |||
| 0.5%Pr | 4.9 μs | Reducing with Pr concentration increasing | — | No separation | |
| 1.5%Pr | 3.1 μs | ||||
| BGO | Un-doped | 300 ns | Same | 68 | Good separation |
| BSO | Un-doped | 100 ns | 105 | Good separation |
Table 2 Properties of dual-read for PWO(50 GeV), BGO and BSO (180 GeV) crystals
| Crystal | Dopants | Attenuation constants | Attenuation of Cherenkov light | Intensity of Cherenkov light /mV | Separation the scintillation and Cherenkov light |
|---|---|---|---|---|---|
| PWO | Un-doped | 9.7 ns | — | — | No separation |
| 1%Mo | 26.3 ns | Reducing with Mo concentration decreasing | 115 | Good separation | |
| 5%Mo | 26.3 ns | 86 | |||
| 0.5%Pr | 4.9 μs | Reducing with Pr concentration increasing | — | No separation | |
| 1.5%Pr | 3.1 μs | ||||
| BGO | Un-doped | 300 ns | Same | 68 | Good separation |
| BSO | Un-doped | 100 ns | 105 | Good separation |
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