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TRD R&D at GSI  Results from test beam 2004  Plans for test beam Feb. 06  Measurements with X-ray stand C. Garabatos, GSI.

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Presentation on theme: "TRD R&D at GSI  Results from test beam 2004  Plans for test beam Feb. 06  Measurements with X-ray stand C. Garabatos, GSI."— Presentation transcript:

1 TRD R&D at GSI  Results from test beam 2004  Plans for test beam Feb. 06  Measurements with X-ray stand C. Garabatos, GSI

2 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI2 TR + tracking  rejection ≤ 10 –2 position resolution ~300  m particle load: 10 5 Hz/cm 2 < 100 ns shaping time material budget reliability (stability, ageing,...)

3 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI3 Solutions under study Classical wire chambers GEMs Straw tubes Name: Transition Radiation Detector 6 mm 2-4 mm

4 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI4 Resolution vs. rate (July 04) (E. Jiménez) Slight degradation with rate Pad size not optimized

5 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI5 9 o incident angle

6 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI6 Pad response function  Next: go from 7.5 mm to 7.0 mm pad width

7 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI7 Next test beam Feb. 2006 Dedicated test beam line in cave C (HTD) Higher rates with N 2 source (factor ~5) Improved set-up –Trigger counters –Chamber pad planes –Readout electronics Dense program

8 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI8 Beam profile in HTD

9 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI9 Trigger scintillators for test beam 2004 4x4 cm 2 plastics 2006 4x 1x4 cm 2 plastics

10 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI10 Pad geometry for new prototypes 20042006 ALICE geometry: 7.5x70 mm 2 CBM geometry: 7x16 mm 2

11 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI11 Readout electronics (H. K. Soltveit) New 0.35  m CMOS 16 channel PASA Submission end of September Enough chips for all test detectors

12 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI12 Chip parameters (H.-K. S.) PerformanceSpecifiedSimulated (typical) Noise1000e for pad capacitance between 5- 10pF 350e@5pF 412e@10pF 660e@25pF Conversion gain12 mV/fC12.6 mV/fC FWHM70 ns Undershoot-1mV Baseline shift-3mV Pad capacitance5-10 pF-

13 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI13 Program High rate performance vs. –Detector flavour and geometry –Gas gain –Gas composition –Incident angle e/  separation vs. radiator type (low rates) –Foil radiator p/  separation at high rates

14 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI14 Measurements with X-ray tube (F. Uhlig, G. Hamar)

15 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI15 Measurements with X-rays Possibility to measure rate dependence on gas gain and gas composition Need careful calibration and extrapolation to charged particles Easy Same set-up will be used for ageing tests

16 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI16 Results with Argon Fit to Mathieson's formula ln(G/G 0 )/G = K R  The constant K characterises the chamber and the gas Next: Xenon

17 IWTRD Cheile Gradistei 24-28.09.05 C. Garabatos, GSI17 Conclusions and outlook We start to know what we need Tracking and TR-ID with MWPC seem feasible at CBM High rates and final performance will be an outcome of –specific, ongoing R&D –detailed, incipient simulations

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