1. in a high intensity beam
Micromegas TPC test
in a high intensity beam
D. Attié, P. Colas, M. Dixit, M. Riallot, W. Wang
I’m here to present a TPC review
LC-TPC Phone meeting 109
Astrophysics Detector Workshop – Nice – November 18th, 2008

2. RD51 Mini-week, CERN – WG7 – February 24, 2010
Data taking diagram
Goliath magnet
Vdrift =1 kV
CAEN 471A
(NIM)
SHV cables
Vmesh = 380 V
Beam trigger
T2K electronics
1728 channels
Back-end electronic
(ML405)
Optical
fibre
Lemo
LV-TTL
TCP/IP via ethenet LV
(+5 V) PC
T2K DAQ on Linux
T2K gas
(5L/h)
500 Go
Standard PC
Power supply
HDD
Hall
Control room
Micromegas TB2010
RD51 Mini-week, CERN – WG7 – February 24, 2010

3. Detector description 1/2
1726 pads Micromegas resistive Kapton bulk
17 cm
23 cm
24 rows x 72 columns; <pad size> ~ 3.2x7 mm2
Micromegas TB2010
RD51 Mini-week, CERN – WG7 – February 24, 2010

4. Detector description 2/2
Total weight: ~20 kg
Radiation length: 40% (2×1.8 cm of aluminium)
B field
Top
27 cm
40 cm
Bottom
35cm
11 cm
Micromegas TB2010
RD51 Mini-week, CERN – WG7 – February 24, 2010

5. Beam test at CERN (RD51, H4 beam)
Data were taken with muons mostly at 1 kHz and with hadrons at intensities up to 180 kHz (over a 5 cm x 1cm region) and 150 GeV energy.
The drift length was 28.8 mm and the field 240 V/cm
The gas was T2K
The mesh voltage was 380 V, which corresponds to a gas gain of 2500
The detector peformed perfectly normally, as usual
We also tested a new, faster and multimodule DAQ. We obtained read-out rates of 40 Hz.
Micromegas TB2010
RD51 Mini-week, CERN – WG7 – February 24, 2010

6. Pad signals at 180 kHz hadrons
WG7
RD51 Mini Week – CERN – September 24, 2009

7. Beam profile (run 565, 14 kHz pions)
WG7
RD51 Mini Week – CERN – September 24, 2009

8. RD51 Mini Week – CERN – September 24, 2009
WG7
RD51 Mini Week – CERN – September 24, 2009