FMD Forward multiplicity detectors LHCC referees meeting CERN

FMD: Forward multiplicity detectors LHCC referees meeting, CERN, 22 November 2004 Børge Svane Nielsen Niels Bohr Institute 1. 2. 3. 4. 5. 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 LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 1

FMD 2+3 layout PMD acceptance limit LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 2

FMD material count Si sensor Hybrid Al honeycomb support plate Total thickness of one Si ring: 0. 7 10 -2 X 0 2. 4 10 -2 I Layer Material Thickness (cm) Density (g/cm 3) Interaction lengths Radiation lengths Silicon detector Si 0. 03 2. 33 0. 7 · 10 -3 0. 3 · 10 -2 Hybrid FR 4 0. 1 1. 7 1. 9 · 10 -3 0. 5 · 10 -2 Digitizer card FR 4 0. 1 1. 7 1. 9 · 10 -3 0. 5 · 10 -2 Support plate Aluminium 2 0. 05 2. 7 2. 5 · 10 -3 1. 1 · 10 -2 LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 3

FMD in Ali. Root LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 4

Ali. Root material simulations Radiation length maps LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 5

Ali. Root material simulations Interaction length map Radiation length map . . . consistent with background conditions used in TDR LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 6

VA 1 radiation hardness Radiation tests of VA 1 by Belle collaboration: Yokoyama et al, IEEE Trans Nucl Sci 48 (2001) 440 LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 7

RCU location DAQ RCU ~3 m Patch panel FMDD “TPC” Front-end bus and Control bus LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 8

Error estimates per run SEU in RCU High Energetic Hadron Flux (@ TPCin): L. Musa: 250 – 550 hadrons / sec • cm 2 Error rate per run (4 hours) per device FEC 3 • 10 -4 RCU 1. 5 • 10 -2 DCS 3 • 10 -2 LHCC meeting, CERN, 22 Nov 2004 1– 5 • 10 -3 @ FMD Børge Svane Nielsen, NBI 9

Measurements of VA 1 -ALICE Linearity better than 2. 5% in required dynamic range (70 f. C). Possible to measure to at least 100 f. C. Noise measurement, 128 channels Setup not well shielded. Average noise level around 175 e-. LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 10

Hybrid and sensor layout Hamamatsu IDEAS LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 11

Electronics integration test in progress Si-strip detector + VA 1 read-out controller Digitized ALTRO output of 128 pulsed VA 1 channels 128 VA 1 channels into 1 ALTRO Analog signal receiver ALTRO test board BSN, 17/11/2004 LHCC meeting, CERN, 22 Nov 2004 First few VA 1 channels. 8 digitizings per channel. Børge Svane Nielsen, NBI 12

FMD heat dissipation Heat dissipated by FE electronics of one Si detector ring: VA 1_ALICE preamp chip (128 channels): 125 m. W (measured) 80 chips = 10 W / ring Read-out electronics and power distribution: 5 W / ring Total per ring: 15 W Total per FMD 2/FMD 3: 30 W LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 13

Thermal simulations A. Mueller: LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 14

LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 15

Signal/background in FMD 2 inner FMD 3 outer FMD 1 Primaries Beam pipe ITS and services T 0, V 0, Absorber, frames LHCC meeting, CERN, 22 Nov 2004 Børge Svane Nielsen, NBI 16