1. 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 理研

2. Contents
・ Introduction of detectors developed at JAEA hadron physics group
-- SSD Detector
-- GEM-TPC Detector
・ About test experiment of TPC detector 理研

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

4. 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 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 @ 1.8 GeV/c
＞8E+06
K-/(p-+m GeV/c
3.5
X/Y(rms) FF (mm)
19.8/3.2
Double stage E.S. Separators
Beam analyzer
(dp/p~10-4)
Design of K1.8 beam line 理研

5. 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 理研

6. 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)
ch of pre-amp and shaper 理研

7. 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 理研

8. 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 理研

9. TPC-GEM prototype @ JAEA理研

10. TPC at K1.8 for MHz 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) 理研

11. 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 理研

12. 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 理研

13. Readout Pad The frontend is FADC (40MHz) Readout pad (rectangle shape)理研

14. Test experiment at LNS　
beam time : 2011/01/24~28 理研

15. 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
-- …. 理研

16. Online Histogram example
Noise from Gating grid
signal
Data analysis and performance check is ongoing !! 理研

17. 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. 理研