Development of 100 MHz trackers 木内隆太A、足立智B、今井憲一C、小沢 恭一郎D、佐甲博之C、 佐藤進C、杉村仁志B、谷田聖A、長谷川E、Joo　ChangwooA　 A) ソウル大学 B) 京大 C) JAEA,　先端基礎研究センター D) 東大 E) JAEA, J-PARCセンター 2011/03/01 @ 理研

Contents ・ Introduction of detectors developed at JAEA hadron physics group -- SSD Detector -- GEM-TPC Detector ・ About test experiment of TPC detector 2011/03/01 @ 理研

J-PARC & Hadron hall SKS magnet K1.8 beamline F.F. K1.8area Q D

K1.8 beamline Double stage E.S. Separators Beam analyzer (dp/p~10-4) Primary proton beam (protons/spill) 30 GeV-9mA 2.0E+14 Length (m) 45.853 Acceptance (msr.%) 1.4 K-(p) intensity (ppp) @1.8 GeV/c 1.4E+06 @1.5 GeV/c 0.54E+06 @1.1 GeV/c 0.08E+06 Electrostatic separators 750kV/10cm, 6m×2 Single rate @ MS2 @ 1.8 GeV/c ＞8E+06 K-/(p-+m- ) @ FF @ 1.8 GeV/c 3.5 X/Y(rms) size @ FF (mm) 19.8/3.2 Double stage E.S. Separators Beam analyzer (dp/p~10-4) Design of K1.8 beam line 2011/03/01 @ 理研

High rate detectors @ J-PARC Hadron hall K1.8 beamline can supply ~1MHz Kaons at F.F. Pions rate will be more than 10MHz The acceptable rate of current detectors ~ 1MHz ( for kaon experiments it is enough and they are first priority, of course) JAEA hadron physics group focus on development of high rate detectors 2011/03/01 @ 理研

SSD Tracker ・(Single Side) Silicon Strip Detector ・Sensor -- ATLAS sensor -- 768ch , 80μm pitch -- effective area 6cm -- radiation tolerance >3*1014 -- (typical operation voltage) ~ +70V ・Readout chip -- APV25-s1 chip (developed by CMS) -- 128 ch of pre-amp and shaper 2011/03/01 @ 理研

Readout ・ 128 ch multiplexed signals are transferred by 30 m category 7 LAN cable ・ Readout by FADC (10bit, 40MHz sampling) ・ Data size 64kB/event for 4 SSD -- zero suppression by FPGA is now test stage 2011/03/01 @ 理研

Basic feature we confirmed Efficiency V.S. Rate Time Resoluton These SSDs are already used at J-PARC, LNS, RCNP From Asano-san’s thesis 2011/03/01 @ 理研

TPC-GEM prototype @ JAEA 2011/03/01 @ 理研

TPC at K1.8 for 10-100MHz beam 4p acceptance spectrometer for charged particles. Target is inside TPC for L, S, X (K0) at high beam rate. Surrounded by EM calorimeter (future) 2011/03/01 @ 理研

Structure of GEM-TPC prototype ・ 40 layers for electrical field ・ (typical) ~ 150V/cm ・ Gating grid Gating Grid 40cm ・ Gas P10 (we did not test with CF4 yet) ・ Readout pad size 2mm,3mm,4mm,(6mm) ・ Test wo B-field GEM & Readout pad 2011/03/01 @ 理研

GEM ・ 10cm x 10cm x t50 μm ・ 3 layer amplification (Gain 103 ~ 104) Ref. ・ 10cm x 10cm x t50 μm ・ 3 layer amplification (Gain 103 ~ 104) “Development of a Time Projection Chamber Using Gas Electron Multipliers (GEM-TPC)” Oda et.al 2011/03/01 @ 理研

Readout Pad The frontend is FADC (40MHz) Readout pad (rectangle shape) 2011/03/01 @ 理研

Test experiment at LNS　 beam time : 2011/01/24~28 2011/03/01 @ 理研

Setup ・ Up to ~3x107 Hz beam ・ Gas : P10 only ・ TriggerMPPC1 & 2 SSD (X,Y) SSD (X,Y) TPC MPPC1 MPPC2 beam SSD hit profile (MPPC1) ・ Up to ~3x107 Hz beam ・ Gas : P10 only ・ TriggerMPPC1 & 2 -- TPC height (drift velocity) -- Pad size dependence -- GEM H.V. scan -- Beam rate dependency -- …. 2011/03/01 @ 理研

Online Histogram example Noise from Gating grid signal Data analysis and performance check is ongoing !! 2011/03/01 @ 理研

Summary We are now developing high rate detectors for J-PARC hadron experiments. SSD detector itself is almost ready and now trying of data suppression part. We made the prototype GEM-TPC detector and have done test experiment. Performance check is now ongoing. 2011/03/01 @ 理研