1 LAST RESULTS OF THE BERKELEY-SACLAY-ORSAY TPC COSMIC-RAY TESTS P. Colas , C. Coquelet, E.Delagnes, A.Giganon, Y.Giomataris , J.-P. Robert, DAPNIA-CEA Saclay F. Bieser, M.Ronan LBNL Berkeley R. Cizeron, G. Guilhem, V.Lepeltier LAL Orsay K. Sachs, Carleton University Ottawa, Ph. Rosier, J. Pouthas, T.Zerguerras , IPN Orsay Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
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L A ST RESULTS OF THE BERKELEY-SACLAY-ORSAY TPC COSMIC-RAY TESTS
L A ST RESULTS OF THE BERKELEY-SACLAY-ORSAY TPC COSMIC-RAY TESTS. P. Colas , C. Coquelet, E.Delagnes, A.Giganon, Y.Giomataris , J.-P. Robert, DAPNIA-CEA Saclay F. Bieser, M.Ronan LBNL Berkeley R. Cizeron, G. Guilhem, V.Lepeltier L AL Orsay K. Sachs, Carleton University Ottawa, - PowerPoint PPT Presentation
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LAST RESULTS OF THE BERKELEY-SACLAY-ORSAY TPC COSMIC-RAY TESTS
P. Colas, C. Coquelet, E.Delagnes, A.Giganon, Y.Giomataris, J.-P. Robert, DAPNIA-CEA Saclay F. Bieser, M.Ronan LBNL Berkeley
R. Cizeron, G. Guilhem, V.Lepeltier LAL Orsay
K. Sachs, Carleton University Ottawa,
Ph. Rosier, J. Pouthas, T.Zerguerras, IPN Orsay
Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
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chamber diameter 50 cm length 50 cm
Berkeley Saclay Orsay
mesh
50 m pitch50 m gap
readout anode pad plane
1024 pads2x10 mm2pads
CHAMBER DESIGN AND PAD LAYOUT
1x10 mm2pads
Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
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new data acquisition in April-May 2004:
superconducting magnet runs at 0.1, 0.3, 0.5, 0.7, 1, 1.5 & 2 Tesla
trigger: 2-3 fold scintillator10 – 50 % efficiency (lower at high fields)
gases: Ar + CF4 / CH4/ iso-C4H10 10% 3% 5%
data acquisition: X20
2004 COSMIC RAY RUN
online event display
Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
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GOOD NEWS
0
100
200
300
400
500
600
0 0,5 1 1,5 2
Ar CF4Ar IsoAr CH4
Magnetic field (T)
Ave
rage
am
plitu
de su
m
after investigation…
it was due to an error in the analysis !!!no effect of B on the amplitude!
wrong!!!
Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
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dE/dX vs particle momentum10 cm Ar-
5%isobutane
momentum distribution
Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
relativistic rise clearly visible
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effect of the transverse diffusion
z= 45cmz= 39cmz= 33cm
z= 25cmz= 18cmz= 12cm
P10 gas@ 0.5T
Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
Vincent Lepeltier ILCD Collaboration meeting January 14th 2005
the Berkeley-Orsay-Saclay Micromegas TPC has been working well and has taken good data last Springanalysis will be finalized soon (spatial resolution) plans for the future: 1/ charge spreading with a resistive foil on Micromegas: resolution tests very soon with the IPN-Orsay point-like e- source tests are planed with the Carleton TPC next spring in the Saclay 2T magnet 2/ hadron beam tests at KEK with the MPI TPC equipped with a Micromegas @1.2T next Spring (or Autumn?) 3/ new cosmic-ray measurements with the large B-O-S TPC at 2T? 4/development and test of «bulk» Micromegas (with woven mesh) at Saclay.