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STAR TPC and FTEC Upgrade for Spectrometer Enhancement

Detailed upgrade overview for STAR TPC and FTEC systems, including specifications, luminosity development, and RHIC projections.

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STAR TPC and FTEC Upgrade for Spectrometer Enhancement

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  1. DAQ and TPC-FEE upgrade Full Barrel Time-of-Flight system Forward Meson Spectrometer Magnet Barrel EMC End Cap EMC Beam-Beam Counters Forward po Det. TPC ZDC VPD’s (TOF Start) Photon Mult. Det. FTPC’s Integrated Tracking Upgrade Forward silicon tracker HFT pixel detector Barrel silicon tracker STAR TPC Review 6-Oct. 2006 R. Majka http://hepwww.physics.yale.edu/star/tpc-study/Luminosity.pdf

  2. Voltage : - 28 kV at the central membrane 135 V/cm over 210 cm drift path 420 CM Secondary e- Drift in Parallel E and B Fields

  3. STAR TPC: 4.2m long, 4m diameter, solenoidal B field (0.5T) (full azimuthal coverage, -1<h<1) Gas, 1atm P10. Central Cathode, drift electrons to wire chambers on end caps. 12 sectors on each end cap with inner and outer sub sectors Pad readout. Electron drift time for full 2m = 40us Ion drift time for full 2m = 0.8 sec.

  4. x x x

  5. STAR TPC Sector Parameters Inner Sector Outer Sector Pad Length 11.5 mm 19.5 mm Pad Width 2.85 mm 6.2 mm Anode Wire-Pad spacing 2 mm 4 mm Mean Npri 33 79 Wire Voltage 1170 V 1390 V Wire Gain 3770 1230 Pad:Wire Coupling 30% 34% Min. Ion Signal 23,000 e 21,000 e Number of Pads 1750 3942

  6. Projected RHIC Luminosity Development Au-Au Fiscal year 2001A 2002A 2004A 2007E 2008E RHIC II No of bunches … 55 55 45 111 111 112 Ions/bunch, initial 109 0.3 0.6 1.1 1.1 1.1 1. Av. Current/ring mA 16 33 45 117 121 b* m 2 1.0 1.0 0.9 0.9 .5 Peak luminosity 1026 cm-2s-1 0.3 5 15 36 40 90 Av. store luminosity 1026 cm-2s-1 0.2 1.5 5.0 8 8 70 Information from: RHIC II/eRHIC White Paper (NSAC Submission) http://www.bnl.gov/henp/docs/NSAC_RHICII-eRHIC_2-15-03.pdf RHIC Mid-Term Plan http://www.bnl.gov/npp/docs/RHICplanning/RHIC_Mid-termplan_print.pdf RHIC Collider Projections (FY2007 – FY2008) http://www.agsrhichome.bnl.gov/RHIC/Runs/RhicProjections.pdf

  7. p-p Fiscal year 2003A 2004A 2005A 2006E 2007E 2008E RHIC II No of bunches … 55 56 106 111 111 111 112 Ions/bunch, initial 1011 0.7 0.7 0.9 1.4 1.8 2.0 2.0 Av. current/ring mA 48 52 119 187 243 280 b* m 1 1 1 1 1 0.9 0.5 Peak lum. 1030 cm-2s-1 6 6 10 30 60 220* 750* Ave. store lum. 1030 cm-2s-1 3 4 6 20 40 150* 500* AGS pol. at extr. % 45 50 55 65 70 75 RHIC store pol., av. % 35 46 47 65 65 70 * With 250 GeV beams

  8. RHIC Machine Development

  9. L~1.34 x 1028 cm-2 sec-1 Run 5 CuCu produced more track loading in TPC than Run 4 AuAu Cu-Cu Collisions RHIC run 5

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