Development of imaging counters using an lens scintillator array

(1)利用光学模拟程序设计了透镜闪烁体阵列的基本形状。结果的形状是基于一个直径为10 mm的圆柱体，并有一个“颈部”来准直其中的光路。圆柱体的一侧被研磨成凸透镜，这样我们就可以在外部获得有效的平行光通量。(2)我们制作了两种类型的透镜闪烁体，其颈部直径分别为2mm和3mm。我们发现，2mm的具有更好的光的聚焦在实验中与照射紫外光。(3)我们在KEKB加速器的碰撞点附近寻找了一个我们设置探测器进行操作测试的地点。我们找到两个候选的地方，我们有一个光子通量和电子通量，分别。两者都是由电子位置碰撞的辐射巴巴过程发射的。(4)我们用BGO晶体制作了透镜闪烁体。我们可以生产一个颈部直径为3毫米的这种类型，尽管预期的晶体易碎。(5)我们将透镜聚光器、反射镜和平板型光电倍增管设置在可用于光束测试的暗箱中，并使用紫外光测量发射光的空间分布。(6)A将装有5个透镜闪烁体阵列计数器的透镜闪烁体阵列计数器测试模块置于KEKB加速器的碰撞区。根据加速器的操作，我们观察到计数器上辐射的空间分布图案的变化。

(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.