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PHOBOS Steve Steadman, (MIT)

PHOBOS Steve Steadman, (MIT). 15th Winter Workshop on Nuclear Dynamics Park City, Utah January 10-15, 1999. Argonne National Laboratory B. Back, A. Wuosmaa Brookhaven National Laboratory M. Baker, D. Barton, A. Carroll, S. Gushue, G. Heintzelman, L. Remsberg, A. Sukhanov

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PHOBOS Steve Steadman, (MIT)

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  1. PHOBOSSteve Steadman, (MIT) 15th Winter Workshop on Nuclear Dynamics Park City, Utah January 10-15, 1999

  2. Argonne National Laboratory B. Back, A. Wuosmaa Brookhaven National Laboratory M. Baker, D. Barton, A. Carroll, S. Gushue, G. Heintzelman, L. Remsberg, A. Sukhanov Case-Western Reserve C. Taylor Goethe University, Frankfurt G. Roland Institute of Nuclear Physics, Krakow A. Budzanowski, K. Galuszka, R. Holynski, J. Kotula, M. Lemler, J. Michalowski, A. Olszewski, M. Stodulski, A. Trzupek, B. Wosiek, K. Wozniak Jagellonian University, Krakow A. Bialas, W. Czyz, K. Zalewski Massachusetts Institute of Technology W. Busza, P. Decowski, K. Gulbrandsen, P. Kulinich, G. van Nieuwenhuizen, H. Pernegger, M. Plesko, L. Rosenberg, P. Sarin, G. Stephans, C. Vale, R. Verdier, B. Wadsworth, B. Wyslouch Max Planck Institut, München R. Ganz National Central University, Taiwan Y.-H. Chang, A. Chen, W. Lin University of Illinois at Chicago R. Betts, C. Halliwell, B. Holzman, J. Katzy, W. Kucewicz, R. Nouicer, D. McLeod, M. Reuter University of Maryland A. Mignerey, E. Garcia-Solis, P. Stanskas University of Rochester A. Hayes, E. Johnson, S. Manly, R. Pak, F. Wolfs PHOBOS Collaboration

  3. PHOBOS features • Almost 4š coverage for charged particle multiplicity on event-by-event basis • Si spectrometer allows coverage to low pt at mid-rapidity • “High” data rate: ~200 events/sec • Almost all one technology: Si pads

  4. PHOBOS detector

  5. Magnet • Fabricated by Danfysik, Denmark • Tested at AGS • Now installed in RHIC tunnel

  6. Module gluing station • Detector assembly rigs handcrafted by Krakow engineers • Detector modules now in production • About 1/3 of one spectrometer arm complete (MIT) • About 1/2 of octagon assembly complete (UIC,ANL) • All modules to be complete by June 30

  7. Data acquisition Mercury Computer System Digital Signal Processor Multiplexer/Zero-suppression system

  8. Time-of-flight modules • NSF has funded construction of two panels at University of Rochester • Krakow machined light guides and designed and machined support structure Module consists of 4 scintillators and 2 R5900 Hammamatsu PMT’s

  9. Si spectrometer modules • Eight different types, with 5 different sensor types • 131 sensors in 27 modules (1 arm) plus spares • One arm finished by Fall 1999 due to funding limit

  10. Si detector module assembly • Hybrids designed at MIT and fabricated and assembled commercially • Module assembly at MIT (Spectrometer) and UIC (Multiplicity)

  11. Multiplicity modules

  12. Si sensors • Designed at National Central University, Taiwan, and fabricated in ERSO foundry (Taiwan) under their supervision

  13. Trigger counters • Designed by Univ. of Maryland and fabricated by Bicron

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