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Development of imaging counters using an lens scintillator array

使用透镜闪烁体阵列的成像计数器的开发

基本信息

批准号：
15540296
负责人：
UEHARA Sadaharu
金额：
$ 1.22万
依托单位：
High Energy Accelerator Research Organization (2004)The High Energy Accelerator Research Organization (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

(1) We have designed the basic shape of a scintillator for the lens scintillator array, using an optics simulation program. The shape in result is based on a cylindrical of 10mm in diameter and has a "neck" to collimate the light path in it. One side of the cylinder is ground as a convex lens, so that we get an effectively parallel light flux, outside.(2) We produced two types of the lens scintillator whose neck diameters are 2mm and 3mm, respectively. We find that that of 2mm has much better focusing of light in an experiment with irradiating an ultraviolet light.(3) We searched for a site where we set the detector for an operation test in the vicinity of the collision point of the KEKB accelerator. We find two candidate places, where we have a photon flux and an electron flux, respectively. The both are emitted by a radiative Bhabha process from electron-position collisions.(4) We produced lens scintillator using BGO crystal. We could produce one with the neck diameter 3mm of this type, in spite of an expected fragility of the crystal.(5) We have set the lens scintillators, a mirror, and a flat-panel-type photomultiplier in a dark box which can be used for a beam test, and have measured the spatial distribution of the emitted light using an ultraviolet light.(6)A test module of the lens scintillator array counter, in which five lens scintillators were set, was placed in the collision region of the KEKB accelerator. We observed a change of spatial distribution pattern of radiation on the counter, according to operation of the accelerator.

(1)利用光学仿真程序设计了透镜闪烁体阵列闪烁体的基本形状。最终的形状是基于直径10毫米的圆柱体，并有一个“颈部”来校准其中的光路。圆柱体的一面被磨成凸透镜，这样我们就能在外面得到有效的平行光通量。(2)我们制作了颈直径分别为2mm和3mm的两种透镜闪烁体。在紫外光照射实验中，我们发现2mm的光圈具有更好的聚焦效果。(3)我们在KEKB加速器碰撞点附近寻找放置探测器进行运行试验的地点。我们找到了两个候选位置，分别有光子通量和电子通量。两者都是由电子位置碰撞的辐射巴巴过程发射的。(4)利用BGO晶体制备透镜闪烁体。我们可以生产一个颈直径为3毫米的这种类型，尽管预期晶体的脆弱性。(5)将透镜闪烁体、镜面和平板型光电倍增管置于可用于光束测试的暗箱中，并利用紫外光测量了发射光的空间分布。(6)在KEKB加速器碰撞区域放置透镜闪烁体阵列计数器测试模块，其中设置5个透镜闪烁体。我们观察到，随着加速器的运行，计数器上的辐射空间分布格局发生了变化。