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FMD: Forward multiplicity detectors

FMD: Forward multiplicity detectors. LHCC referees meeting, CERN, 22 November 2004 Børge Svane Nielsen Niels Bohr Institute. Material in front of FMD: ITS services Material in FMD, in front of e.g. PMD Radiation tolerance of detector and electronics

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FMD: Forward multiplicity detectors

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  1. FMD: Forward multiplicity detectors LHCC referees meeting, CERN, 22 November 2004 Børge Svane Nielsen Niels Bohr Institute Material in front of FMD: ITS services Material in FMD, in front of e.g. PMD Radiation tolerance of detector and electronics Recent progress on sensors and electronics Temperature environment of FMD Børge Svane Nielsen, NBI

  2. FMD2+3 layout PMD acceptance limit Børge Svane Nielsen, NBI

  3. FMD material count Si sensor Hybrid Al honeycomb support plate Total thickness of one Si ring: 0.7  10-2X0 2.4  10-2I Børge Svane Nielsen, NBI

  4. FMD in AliRoot Børge Svane Nielsen, NBI

  5. AliRoot material simulations Radiation length maps Børge Svane Nielsen, NBI

  6. AliRoot material simulations Interaction length map Radiation length map ... consistent with background conditions used in TDR Børge Svane Nielsen, NBI

  7. VA1 radiation hardness Radiation tests of VA1 by Belle collaboration: Yokoyama et al, IEEE Trans Nucl Sci 48 (2001) 440 Børge Svane Nielsen, NBI

  8. RCU location DAQ RCU Patch panel ~ 3 m FMDD “TPC” Front-end bus and Control bus Børge Svane Nielsen, NBI

  9. Error estimates per run SEU in RCU High Energetic Hadron Flux (@ TPCin): 250 – 550 hadrons / sec • cm2 Error rate per run (4 hours) per device FEC 3•10-4 RCU 1.5•10-2 DCS 3•10-2 L.Musa: 1–5•10-3 @ FMD Børge Svane Nielsen, NBI

  10. Measurements of VA1-ALICE Linearity better than 2.5% in required dynamic range (70 fC). Possible to measure to at least 100 fC. Noise measurement, 128 channels Setup not well shielded. Average noise level around 175e-. Børge Svane Nielsen, NBI

  11. Hybrid and sensor layout Hamamatsu IDEAS Børge Svane Nielsen, NBI

  12. Electronics integration test in progress Digitized ALTRO output of 128 pulsed VA1 channels Si-strip detector + VA1 read-out VA1 read-out controller 128 VA1 channels into 1 ALTRO Analog signal receiver ALTRO test board BSN, 17/11/2004 First few VA1 channels. 8 digitizings per channel. Børge Svane Nielsen, NBI

  13. FMD heat dissipation Heat dissipated by FE electronics of one Si detector ring: VA1_ALICE preamp chip (128 channels): 125 mW (measured)  80 chips = 10 W / ring Read-out electronics and power distribution:  5 W / ring Total per ring:  15 W Total per FMD2/FMD3:  30 W Børge Svane Nielsen, NBI

  14. Thermal simulations A. Mueller: Børge Svane Nielsen, NBI

  15. Børge Svane Nielsen, NBI

  16. Signal/background in FMD FMD2 inner FMD3 inner FMD3 outer FMD1 Primaries Beam pipe ITS and services T0, V0, Absorber, frames Børge Svane Nielsen, NBI

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