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The HADES RICH High Acceptance Di-Electron Spectrometer

The HADES Spectrometer Special requirements RICH setup Mirror Window Photon detector Preliminary results from 12 C- 12 C [1.0 AGeV] Outlook. The HADES RICH High Acceptance Di-Electron Spectrometer. For the HADES Collaboration. Motivation.

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The HADES RICH High Acceptance Di-Electron Spectrometer

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  1. The HADES Spectrometer Special requirements RICH setup Mirror Window Photon detector Preliminary results from 12C-12C [1.0 AGeV] Outlook The HADES RICH High Acceptance Di-Electron Spectrometer For the HADES Collaboration R. Gernhäuser (TU-München)

  2. Motivation • Properties of hadrons in strong int. matter: M, G vsr, mB, T, V Vector meson , ,  spectral functions measurements • Hadron’s structure: VDM, Form factors, vector meson-nucleon inter. Dalitz and two-body decays, pN, N reactions SIS / GSI : heavy ion, proton,pion beams 0 r 3 r00  T  80 MeV HADES: systematic dilepton spectroscopy • meson prod. in pA / pA : r = r0 , T = 0 MeV • meson prod. in pp / pp : r = 0 , T = 0 MeV • meson prod. in AA : r = 1-3r0 , T = 80MeV R. Gernhäuser (TU-München)

  3. High Acceptance Di-Electron Spectrometer Magnet SC. toroid ( 6 coils) • 2p in f18o < J < 85o Lepton Identification RICH C4F10 + gas Phot. Det. CsI - cathode META TOF scintillator wall + Pre-Shower detector p/ identification META and tracking Tracking p – measurement, vertex reconstruction MDCDrift chambers dx ~ 80 mm (s) R. Gernhäuser (TU-München)

  4. Design Constraints beam intensity 108/s central collisions 105/s ch. particles < 200/evt lepton pairs 103/s fast high granularity hadron blind CsI based MWPC with gas radiator experimenthall N0 ~ 100 Trigger device R. Gernhäuser (TU-München)

  5. Fast Photon Detector • 6 sector shaped MWPCs with 2.4 mm gap • 5*104 < gain < 1*105 @ 2450V • signal coupling on several pads • solid CsI photon converter on special substrate material (RSG) R. Gernhäuser (TU-München)

  6. ring radius [pads] polar angle [°] Photon Detector Shape A trigger device for b ~ 1 particles constant ring radius • 4712 pads/sector, individually shaped 4.5 mm < y < 7 mm, x = 6.6mm • GASSIPLEX based FE-electronics • 10ms conversion time R. Gernhäuser (TU-München)

  7. Mirror Ø 150 cm, R = 871 mm, d = 2 mm Poly – Carbon • rad. length X0 = 28cm • 18 panels polished Float Glass • rad. length X0 = 14cm • 6 panels, molded J. Friese (Saturday afternoon) R. Gernhäuser (TU-München)

  8. CaF2 - Window Crystal window Ø = 140cm 64 CaF2 hexagonal crystals Ø = 20cm, d = 5mm Dp < 5mbar R. Gernhäuser (TU-München)

  9. The Eye of HADES Commissioning in 2001 Full HADES Setup (! outer tracking) 108 events C – C 1-2 AGeV 400mm Carbon fiber radiator shell R. Gernhäuser (TU-München)

  10. Typical Pattern Data Nov. 2001, C - C @ E = 1 AGeV R. Gernhäuser (TU-München)

  11. RICH online Lepton ID • Ring recognition algorithm (fixed radius) • Ring radius (+) inner and outer veto regions (-) • Threshold on positive and negative quality parameters J. Lehnert (Sunday morning) Reference of qualitative and quantitative detector response needed R. Gernhäuser (TU-München)

  12. Calibration Measurement(OEM online efficiency measurement) calibrated light source! Photons produced by 600 AMeV 12C beam particles passing two different solid radiators R. Gernhäuser (TU-München)

  13. OEM results Radial distribution of photonsrepresents spectral sensitivity of the detector single 12C hit 200 nm 200 nm 145 nm 163 nm N0 > 90 beam pipe shadow L. Fabbietti (Sunday morning) R. Gernhäuser (TU-München)

  14. g g e+ e+ p0 e- Conversion e- Dalitz Dominant Dilepton Sources 7 M events C+C @1.0 AGeV opening angle [°] cut on opening angle combinatory pairs negligible R. Gernhäuser (TU-München)

  15. Efficiency of Ring recognition polar angle [°] momentum [MeV/c] The Ring Properties Rings from single leptons e+e- pair with 1 track/ring Th. Eberl (Sunday afternoon) R. Gernhäuser (TU-München)

  16. Lepton ID with TOF and RICH Data: Nov01C-C 2.0 AGeV preliminary q*momentum p q*momentum TOF[ns] R. Gernhäuser (TU-München)

  17. Lepton ID online -offline preliminary • Full HADES simulation and data analysis • RQMD ev.generator Ne/N+ Correlation of rings found by hardware or software image processing A. Toia (Sunday morning) R. Gernhäuser (TU-München) q* momentum [e*MeV/c]

  18. Outlook • HADES comes into operation (e/p/p sep., LVL2 trig., tracking) • 3 MDC layer will be completed this summer (p3% for /) Phase I (2002 – 2003) : (acc. proposals S200 ,S262) • Continuum below M inv < 600 MeV/c2 ; 0 Dalitz in C+C (more statistics) • High statistics e+,e- production in HI reactions C+ C @ 1 – 2 AGeV (compare to DLS) • e+e- production in p- p p- p @ 0.8 – 1.3 GeV/c (below and above threshold for r/w) • e+e- pair acceptances pp  pph pp e+e- R. Gernhäuser (TU-München)

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