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L A ST RESULTS OF THE BERKELEY-SACLAY-ORSAY TPC COSMIC-RAY TESTS

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LAST RESULTSOF 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.RonanLBNL Berkeley

R. Cizeron, G. Guilhem, V.LepeltierLAL Orsay

K. Sachs, Carleton University Ottawa,

Ph. Rosier, J. Pouthas, T.Zerguerras, IPN Orsay

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

CHAMBER DESIGN AND PAD LAYOUT

Berkeley Saclay Orsay

chamber

diameter 50 cm

length 50 cm

readout anode pad plane

mesh

1024 pads

2x10 mm2pads

1x10 mm2pads

50 m pitch

50 m gap

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

new data acquisition in April-May 2004:

superconducting magnetruns at

0.1, 0.3, 0.5, 0.7, 1, 1.5 & 2 Tesla

trigger: 2-3 fold scintillator

10 – 50 % efficiency (lower at high fields)

gases: Ar + CF4 / CH4/ iso-C4H10

10% 3% 5%

data acquisition: X20

online event display

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

after investigation…

it was due to an error in the analysis !!!

no effect of B on the amplitude!

Average amplitude sum

wrong!!!

Magnetic field (T)

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

relativistic rise clearly visible

dE/dX vs particle momentum

10 cmAr-5%isobutane

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

effect of the transverse diffusion

σ2 (width) increasing with drift distance

z= 12cm

z= 18cm

z= 25cm

P10 [email protected] 0.5T

z= 33cm

z= 39cm

z= 45cm

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

B=0.3 T

0.5 T

0.7 T

1.0 T

track width vs drift distance

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

10-15% less measured diffusion than calculated by Magboltz

B measurement calculation

0.3T 224 µmxcm-1/2 308 µmxcm-1/2

0.5T 171 229

1T 105 140

Ar-3%CF4 @200V/cm

0.3T 184 202

1T 80 86

Ar-5%iso @221V/cm

0.1T 388 449

0.3T 308 355

0.5T 254 284

1T 177 193

1.5T 131 146

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

10-15% less measured diffusion than calculated by Magboltz

B measurement calculation

0.3T 224 µmxcm-1/2 308 µmxcm-1/2

0.5T 171 229

1T 105 140

Ar-3%CF4 @200V/cm

0.3T 184 202

1T 80 86

Ar-5%iso @221V/cm

0.1T 388 449

0.3T 308 355

0.5T 254 284

1T 177 193

1.5T 131 146

200μm @4T @1m!

potential transverse point resolution of 25μm at 1m

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

CONCLUSIONS

the Berkeley-Orsay-Saclay Micromegas TPC has been working well and has taken good data last Spring

analysis 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.

Vincent Lepeltier ILCD Collaboration meeting January 14th 2005

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