Fast response silicon pixel detector using SOI. 2016/08/10 Manabu Togawa

Transcription

1 Fast response silicon pixel detector using SOI 2016/08/10 Manabu Togawa 1

2 100 ps High intensity fixed target NA62200 ps J-PARC MEG TOF-PET TOF-PET 400 ps α

3 K + -> π + νν : NA62 expriment At CERN SPS Goal : ~100 events over 2 years data taking

4 Detector - Signal : K + + π + + missing mass 750 MHz primary Hadron beam at 75GeV/c 7-10 MHz of Muon Rate in the Detectors CEDAR GTK Target 50 MHz K + rate 750 MHz rate Decay Region 65m K + decays/ year in fiducial region Straw Tracker RICH T < 100 ps T < 150 ps T < 100 ps LKr MUV

5 GIGA-tracker Giga%tracker+for+NA62+about+in+use Hybrid+pixel+ σt+=+200+ps+ 200+um+thick+ Table 1 Detector performance requirements. Material budget per station 0.5 % X 0 Overall efficiency per station > 99 % Dynamic range fc; e - Pixel size 300 µm x 300 µm Time resolution < 200 ps rms. Bump-bonding GTK chip

6 MEG : µ -> e γ Lepton Flavor Violation Standard model New physics Highly suppressed. BR ~ Large BR via SUSY

7 Experimental history of muon LFV!! µ -> e γ MEG experiment 5.7 x MEG2 will reach 5x10-14 ( ) µ -> 3 e at PSI µn -> en COMET, DeeMe in JP Mu2e in US

8 MEG 52.8 MeV( M μ /2) 52.8 MeV( M μ /2) Two$body(decay(! Clear-signature-! Easy--to-gain-acceptance-(solid-angle-&- momentum)- Neutral(particle((γ)(! Difficult-in-high-precision-&-high- efficiency-detection-! No-(or-very-little)-info-of-direction-! Not-able-to-test-vertex-matching-- or Physics(BG( Time-coincident- But-highly-suppressedat-signal-region-byenergies-&-angle- Accidental(BG( Time,-direction-&- energies-are-random- But-dangerous-athigh-intensity- Dominant(in(MEG

9 MEG experiment

10 Photon measurement using silicon detector arxiv& &&&snowmass&2013&report A&0.56%mm% Pb&(0.1&X0)& conversion& layer.& Si&strip&for& detector Tracking of γ -> e+e- Previous MEGA used this type detector :)! Good energy resolution Determination of the direction of photon :( Low conversion efficiency

11 75%cm! In#1.5#T#uniform#B/field#! 10#super#layers# first%layer%from%r=26%cm% at%5%cm%radial%distance! A#super#layer#consists#of# two%100%um%pb%converters% two%si%pixel%layers%put%both%outside%the% conversion%double%layer%! Target# 100%um%plastic%sheet% slant%angle%of%10 %to%spread%vertex% distribution% " ~15%#conversion#eff.# assuming%50%%rec.%eff.%7 8%%eff.% # Need#active#area#of#160#m 2# CMS%level!%%% Increase%BMfield,%increase%subMlayers% JPS2014Autumn Yusuke UCHIYAMA/ The University of Tokyo 19

12 Comparison w/ current detector Conversion method 1. Liquid(xenon(γ(detector( High%eff.%γ%detection%(ε%>%50%)% Total%absorption%w/o%any%dead%material,%with%good% uniformity%and%high%light%yield%(σ E %~%1%)% High%time%resolution%(σ t %~%60%ps)% Difficult%operation,%need%massive%cryostat% Weak%to%pileup%due%to%single%volume% No%power%of%direction%reconstruction% 2. Gradient(B5field(for(efficient(e + (measurement( 3. Relatively(small(solid(angle((geometrical( acceptance)(~(10% ~5% efficiency 15% conversion efficiency w/ active area of 160 m % efficiency assuming 50% reconstruction efficiency. High energy resolution. 0.4% for 52.8 MeV, 3 times better than MEG2. Timing resolution requires ~50 ps High vertex resolution ~50 mrad.

13 To achieve Covering large area : 160 m 2 Compensation for low conversion efficiency. Thickness : < 100 µm Good energy resolution needs low material. 50µm High time resolution : O(100 ps) Needs high resolution TDC.! Position resolution may be assuming 8 µm. ILC SOI50 µm 2 (This configuration is used in snowmass 2013 report) 10 µm CCD or 50 µm pixel w/ ADC (depends on # hits in pixels for 1 track).

14 澁谷 陽電子放射断層撮影 (PET) 装置とその検出器 入門講座 TOF-PET d d 2 図 7 結晶対による同時計数の位置分解能 る同時計数率が最大になるのは結晶の中心軸上に点線源 が来たときで 点線源が結晶の縁の延長線上まで移動す 図 6 TOF 情報の有無によるノイズの違い 23) 400 ps TOF (MC) 範囲の直径を D x TOF による LOR 方向の空間分解能を ると感度はゼロになる したがって 応答関数は図中の 三角形となり この結晶対に固有の空間分解能 (FWHM) は二等分線上で d/2 である 14

15 [cm 2 /(V*s)] µe = 1350 [cm 2 /(V*s)] µh = 480 [V/m] E = V/d = 8e V, 50 µm [m/s] : v = µ E! te = d / ve = 50e-6 / 1350e-4 / 8e+6 = 4.6 e-11 -> 46 ps th = d / vh = 50e-6 / 480e-4 / 8e+6 = 1.3 e-10 -> 130 ps!

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17 Detector - Signal : K + + π + + missing mass - 45 SM events / year w/ background less than MHz primary Hadron beam at 75GeV/c 7-10 MHz of Muon Rate in the Detectors CEDAR GTK Target 50 MHz K + rate 750 MHz rate Decay Region 65m K + decays/ year in fiducial region Straw Tracker RICH T < 100 ps T < 150 ps T < 100 ps LKr MUV

18 S. Antusch et al, JHEP 0611:090(2006) SUSY-Seesaw SUSY-Seesaw MEGA in 1999