TopMetal and Its Applications China-Japan Mini Workshop on SOIPIX TopMetal and Its Applications Xiangming Sun Central China Normal University
outline TopMetal sensor readout electronics beam monitor high precision TPC
TopMetal sensor top metal via metal
TopMetal design 简化 TopMetal pixel structure 4 4
TopMetal wafer wafer microscope(pitch 80um) 5 chip after bonding
TopMetal charge collection TopMetal in TPC-like structure Detector Material GEM TopMetal E not necessary, if signal is big enough 6
readout electronics adaptor wafer ADC driver board bonding board Daq
application in beam monitor
beam monitor in air integration time:1ms beam current:1pA E field beam direction Topmetal chip integration time:1ms beam current:1pA resolution:<1um(in theory,1pA current) 30um(single particle)
test with beam Pinhole -HV Vacuum Window Sensor 13.5MeV proton beam from the 88-inch Cyclotron, 20E6 p/s/mm2 10
test with beam position resolution:10um-30um (mainly systematic error) For both 1mm hole, stage moved by 2mm position resolution:10um-30um (mainly systematic error) beam current:20fA
beam monitor for hadron therapy anode board TopMetal chip readout board volume:20cm X 12cm X 2cm active range:5cm X 5 cm no material; no radiation damage
next generationTopMetal chip TopMetal-I and TopMetal-II-,ENC 207e(TopMetal-I)to 13.9e (TopMetal-II-)。
compton camera 14 SMILE, ETCC, arXiv:1312.0438
solar neutrino LXe solar neutrino E<0.42MeV is hard to measure (Broxino)。 to constrain theory TopMetal芯片 PMT S. Turck-Chi` eze et al., Rept. on Prog. in Phys. (2010) arXiv: 1009.0852v1[astro- ph.SR] 4 Sep 2010.
double beta decay double beta decay has geometric feather measure track to surpress noise
double beta decay 30cm track 0.5cm pixel TM1 noise 1.6K ENC no amplification; 30cm track 0.5cm pixel TM1 noise 1.6K ENC TM2-noise 0.2K ENC
challenge make a 2D plane low noise; goal to 10 ENC
summary develop TopMetal chip of low noise beam test at LBL developing prototype for hadron therapy next generation for low noise
谢谢 Thanks
高精度TPC:模式触发 阳极板 电子 正离子 阴极板 电子首先到达阳极板,在低分辨率的TPC读出板上读出感应信号 在阳极板有信号区域对应的阴极板上,等待离子漂移到达
高精度探测原理 对于低能的带点粒子,只有初始部分的径迹带有方向信息。 作为次级粒子的带电粒子和入射粒子的方向存在关联 从带点粒子的径迹中提取方向信息。 提高空间分辨能力 反应点 次级带电粒子 Double beta decay
高精度TPC:离子漂移 TPC的空间分辨能力由漂移中的扩散决定。 扩散越小,能分辨的的径迹就越小。 离子漂移时和周围环境温度接近,扩散较小。 Gas mix CS2 15cm drift Pressure (torr) E(KV/m) Transverse diffusion(mm r.m.s.) Ar 40 47 0.12 35.3 0.21 23.5 0.38 Xe 0.13 16.5 0.33 TPC的空间分辨能力由漂移中的扩散决定。 扩散越小,能分辨的的径迹就越小。 离子漂移时和周围环境温度接近,扩散较小。 扩散半径100um-400um(漂移距离15cm) 离子漂移速度约100m/s,约电子漂移速度约10000m/s 离子漂移时间长 http://ac.els-cdn.com/S0168900299009559/1-s2.0-S0168900299009559-main.pdf?_tid=09da50ee-4ef8-11e4-b447-00000aacb361&acdnat=1412778975_84120b13e1209b0e7c4e0ba08bf3f60e
需要高空间分辨TPC的物理问题 低能太阳中微子 暗物质测量 活靶 double beta decay