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A FOrward CALorimeter for the PHENIX experiment

A FOrward CALorimeter for the PHENIX experiment. Y. Kwon Yonsei Univ. Korean FOCAL group Chonbuk National Univ., Ewha Woman’s Univ. , Korea Univ., Myungji Univ., Yonsei Univ. Optimized for Rare probes e, , , high p T hadrons. PHENIX. Collision location.

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A FOrward CALorimeter for the PHENIX experiment

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  1. A FOrwardCALorimeter for the PHENIX experiment Y. Kwon Yonsei Univ. Korean FOCAL group Chonbuk National Univ., Ewha Woman’s Univ. , Korea Univ., Myungji Univ., Yonsei Univ.

  2. Optimized for Rare probes e, , , high pT hadrons PHENIX Collision location

  3. FoCAL & PHENIX PHENIX : Focus on rare processes limited rate limited acceptance • Luminousity •  Upgrade? FoCAL : Forward upgrade, A high density, high granularity Si-W tracking calorimeter.

  4. Acceptance • 2p coverage in azimuth and 0.9 < h < 3.0 Technically, EMCal Focus on Ability to distinguish between photons and π0’s up to 60 GeV Ability to identify EM/hadronic activity

  5. When e/ enters material…

  6. Detector Design Scheme Pad layer uses 4 mm W and 535 m silicon sensors. High resolution xy silicon strip layers for γ/π0 discrimination Spatial restrictions  Compact detector, ~ 20 cm depth with high granularity  Small Moli’ere radius ~ 14 mm.  Si-W supertowers stacked in brick-like manner.

  7. Detector Resolutions Resolution

  8. 0 reconstruction

  9. Beam test 2007 • ADC mean value shows linear dependence on incident electron energy high density, high granularity Close to simulation result 100 GeV e width 5%

  10. A native picture • FOCal would allow us to study the medium via long range correlations. • FOCAL will extend h reach, Dh ~ 5.

  11. Under study Parameterized background by studying average energy deposited in the detector (E) and its fluctuations (RMS).

  12. NSAC milestones • Use FoCAL to look at spin orbit correlations and the transverse force on quarks. • Measure forward photon η > 2 and jet using VTX -1 < η < 0 • Determination of the process dependence of the Sivers effect in γ+jet events • Measure last leading twist distribution of the nucleon: transversity (unknown for x>0.3)

  13. Another motivation

  14. D-Ram? CPU? Si-detector?

  15. ETRI

  16. Really competitive? • Cost • (103)$/cm2 is typically quoted price. • 5$/cm2 or so for ETRI processing… probably lower side. Cost includes • yields and fabrication capability ( good infra-structure ). • PHENIX FOCAL plans to purchase from Korea if … (already helped R&D by about 30k$ ). • Future • Cost for nanoFAB will be even lower… It will remain to be so for a while.

  17. Silicon pad sensor - Basically PN junction diode inreverse bias mode. N-type substrate and p-type pattern for high energy application => electrons are carriers 16 square(1.5cm×1.5cm) pads in one micro-module ground Yonsei Nuclear Physics Lab.

  18. Production results 4 sample micro-module production has completed. Mechanical and electrical issues have been checked Yonsei Nuclear Physics Lab.

  19. Preamp Card

  20. Preamp Card Output signal Injected signal

  21. Summary • Explored FOCAL acceptance ~ 0.9 <η <3.0 • FOCAL will trigger, detect, and identify e, , and 0. •  energy resolution ~ 5% at p = 25 GeV/c or pT ~ 10 GeV/c . • Technically, W/Si calorimeter • High density, high granularity. • Replacing existing auxiliary absorbers in the muon spectrometers. • Test beam scheduled at CERN and assisted by ALICE. • Evaluation by full simulation in progress. • Koreangroups are marching aggressively. • Sensor production & test • Readout ( preamps ) • We plan on having FOCAL fully installed and operational by 2012.

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