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TopMetal and Its Applications
China-Japan Mini Workshop on SOIPIX TopMetal and Its Applications Xiangming Sun Central China Normal University
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outline TopMetal sensor readout electronics beam monitor
high precision TPC
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TopMetal sensor top metal via metal
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TopMetal design 简化 TopMetal pixel structure 4 4
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TopMetal wafer wafer microscope(pitch 80um) 5 chip after bonding
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TopMetal charge collection
TopMetal in TPC-like structure Detector Material GEM TopMetal E not necessary, if signal is big enough 6
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readout electronics adaptor wafer ADC driver board bonding board Daq
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application in beam monitor
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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)
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test with beam Pinhole -HV Vacuum Window Sensor
13.5MeV proton beam from the 88-inch Cyclotron, 20E6 p/s/mm2 10
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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
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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
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next generationTopMetal chip
TopMetal-I and TopMetal-II-,ENC 207e(TopMetal-I)to 13.9e (TopMetal-II-)。
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compton camera 14 SMILE, ETCC, arXiv:
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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: v1[astro- ph.SR] 4 Sep 2010.
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double beta decay double beta decay has geometric feather
measure track to surpress noise
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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
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challenge make a 2D plane low noise; goal to 10 ENC
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summary develop TopMetal chip of low noise beam test at LBL
developing prototype for hadron therapy next generation for low noise
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谢谢 Thanks
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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
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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
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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
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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
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