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Tracking Issues in the Central Region

Tracking Issues in the Central Region. Craig Woody BNL. DC Upgrade Meeting August 11, 2002. General Comments. PHENIX would benefit greatly by implementing a tracking system inside the central magnet: Improved momentum resolution Reduced background from decays and conversions

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Tracking Issues in the Central Region

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  1. Tracking Issues in the Central Region Craig Woody BNL DC Upgrade Meeting August 11, 2002

  2. General Comments • PHENIX would benefit greatly by implementing a tracking system inside the central magnet: • Improved momentum resolution • Reduced background from decays and conversions • Improved vertex tracking capabilities when used in • conjunction with the VTX • Improved pattern recognition when used in conjunction with • the HBD • We would also benefit greatly by expanding our tracking coverage beyond the present PHENIX acceptance in both h and f. This is particularly important if we want to study jets and do g-jet correlations. • The problem is with implementing a tracking system that will cover h ~ 1 due to the limited space for all detectors in the central region. C.Woody, DC Upgrades Meeting, 8/11/04

  3. Central Region h=0.35 h=0.70 h=0.88 Planar GEM Tracking chambers h=1.17 h = 2.6 Provides tracking coverage over -2.6 < h < 2.6 Space for the TPC is being squeezed by the need to bring out services for the VTX and the need for space for the readout electronics 10-15 cm C.Woody, DC Upgrades Meeting, 8/11/04

  4. Nose Cone Calorimeter NCC ~ 1 m dia Area ~ 0.8 m2 2 detectors x 2 sides  GEM area = 4 x 0.8m2 =3.2 m2 Two barrel detectors would add ~ 10m2 Total GEM area for HBD ~ 1 m2 Tracking in front of the NCC would provide clean separation of charged and neutral showers Would also provide tracking in a region of rapidity not presently covered in PHENIX E.Kistenev Missing rapidity coverage C.Woody, DC Upgrades Meeting, 8/11/04

  5. COMPASS GEM Detectors COMPASS tracking system includes a set of 20 triple GEM detectors (31x31 cm2) each Position resolution comparable to Si detectors s ~ 46 mm Problems with occupancy for PHENIX ? We may want to use a “Micropad” readout similar to what is being proposed for the Forward Silicon 2D readout using Microstrips C.Woody, DC Upgrades Meeting, 8/11/04

  6. STAR/MIT GEM Development • STAR is planning to implement a large (~ 10m2) GEM tracking system in their forward direction. • There is a world-wide problem in obtaining GEM foils from CERN due to their limited production capacity (large demand from LHC-B may limit world supply for the foreseeable future) • We (PHENIX/BNL) have been collaborating with CERN, MIT and Yale on developing a new commercial source of GEM detectors (Tech Etch in Plymouth, MA) • MIT has also been developing a GEM readout system based on the COMPASS readout chip. C.Woody, DC Upgrades Meeting, 8/11/04

  7. Comparison of CERN, 3M and Tech Etch Foils • Measurements • taken w/ Fe-55 • source • Field config. • DG: 0.4kV/cm • TG 1: 2.5kV/cm • TG 2: 3.0kV/cm • IG: 3.5kV/cm B.Azmoun C.Woody, DC Upgrades Meeting, 8/11/04

  8. Gain Stability of GEM Foils B.Azmoun Gain instability appears to be a charging effect in the foils due to materials or process used by different manufacturers C.Woody, DC Upgrades Meeting, 8/11/04

  9. Comparison of Tech Etch and CERN Foils C.Woody, DC Upgrades Meeting, 8/11/04

  10. APV25 Readout Chip Developed for CMS Silicon strip detector Used by COMPASS for reading out GEMs Bernd Surrow / MIT C.Woody, DC Upgrades Meeting, 8/11/04

  11. Future Steps ? • STAR is planning to install a set of three small (10x10 cm2) triple GEM tracking detectors in their forward region possibly as early as Run 5 with a complete readout system based on the APV25 chip (future plans are for a large, 10 m2 system) • Is a system like this of interest to PHENIX ? • Can we provide enough space in the central region to implement a large acceptance tracking system (either with a TPC or with a system of planar GEM tracking detectors) along with all of the other detectors (and their services) that are planned to go into this region ? • If we’re interested in this, we need to start doing some serious simulation work on how such a tracking system would perform. C.Woody, DC Upgrades Meeting, 8/11/04

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