Study of Undoped CsI or BaF_2 Calorimeter with wavelength shifter readout

具有波长移位读出功能的未掺杂CsI或BaF_2量热计的研究

• 批准号: 05640364
• 负责人: KUNO Yoshitaka
• 金额: $ 1.28万
• 依托单位: National Laboratory for High Energy Physics
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640364/
• 关键词: Wavelength shifter; Undoped CsI; Undoped BaF_2; Plastic scintillator; Average 20% readout efficiency; 2-m attenuation length; Pulse shape analysis of scintillating lights; Active wavelength shifter; 波長シフタ-; 変換効率; 減衰長; プラスチック・シンチレーター; シリコン・ラバー

For the application of undoped CsI,we have tested 6 different kinds of wavelength-shifting materials to measure the readout efficiency and the attenuation length of lights. They are (a) Bicron BC408, (b) Bicron BC499-54, (c) Bicron BC499-55, (d) Bicron BC499-56, (e) Kurrary PMMA (acryl), and (f) Kurrary's SCSN81. We obtained an average 20% readout efficiency (for a short sample) and about 2-m attenuation length.In particular we are interested in 100% active calorimeter, in which we have to separate the lights from the shifter's light and (wavelength-shifted) CsI lights. We have tried pulse-shape analysis and/or shifters with less plastic-scintillating flour. As a result, we found that the shifter with less fours (such as the sample (c)) we might be able to separate them.For the application of undoped BaF_2, which attracts attention owing to its fast timing characteristic, the development of wavelength shifters is not easy because of its 220-nm UV lights. Finally we have obtained a sample of shifter from Bicron and we are going to test it.

对于未掺杂CsI的应用，我们测试了6种不同的移波材料，测量了读出效率和光的衰减长度。它们是(a) Bicron BC408, (b) Bicron BC499-54, (c) Bicron BC499-55, (d) Bicron BC499-56, (e) Kurrary PMMA（丙烯酸），(f) Kurrary’s SCSN81。我们获得了平均20%的读出效率（对于一个短样本）和大约2米的衰减长度。我们特别对100%有源量热计感兴趣，在这种量热计中，我们必须将光与移位器的光和（波长移位的）CsI光分开。我们已经尝试了脉冲形状分析和/或移位与较少的塑料闪烁面粉。因此，我们发现，移位器与较少的四个（如样品(c)），我们可能能够分离它们。未掺杂的BaF_2因其快时序特性而备受关注，但由于其具有220 nm紫外光，因此波长移频器的开发并不容易。最后我们从Bicron获得了一个shifter的样品，我们将对它进行测试。