Background Studies Takashi Maruyama SLAC ALCPG 2004 Winter Workshop January 8, 2004.

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Presentation transcript:

Background Studies Takashi Maruyama SLAC ALCPG 2004 Winter Workshop January 8, 2004

OUTLINE Pair background –Pair background in forward detector –High energy electron detection –Radiation environment Other backgrounds –Beam-gas scattering (Keller) –   hadrons (Barklow) Background in Central Tracker Summary

e+ e- Pairs from e+ e- Collisions Energy (GeV) = 4.1 GeV With Current NLC IP Beam Parameters: # e+ or e- = 49,000/bunch = 4.1 GeV E_total = 199,000 GeV

SiD Forward Masking, Calorimetry & Tracking Tesla

Pair Distribution Z = -315 cmZ = +315 cm Y (cm) X (cm) 20 mr crossing angle Head-on 5 Tesla e+ e- 8 cm ≈ 25 mrad

Pair Energy vs. Beampipe Radius Crossing angle case: IN Beampipe radius = 1 cm

LCD SiD Detector in GEANT 3 5 Tesla Field Map (not constant field) z x e+

High Energy Electron Detection Veto for  *  * is essential for SUSY searches (Colorado). Pair background is confined within 8 cm of the beamline at 5 Tesla. Veto capability to 25 mrad is relatively easy. Big question is whether we can detect high energy electrons inside the pair background DESY-Zeuthen group studied for TESLA, Drugakov (Amsterdam), Lohmann (Montpellier). High energy electrons can be detected inside the pair background, thus extending the veto capability to ~6 mrad. This is a first attempt at detecting high energy electrons for NLC. Lohmann

High Energy Electron Detection in LUMON Beampipe radius: IN 1 cm, OUT 2 cm Detector: 50 layers of 0.2 cm W cm Si Zeuthen R-  segmentation OUTIN Generate 200 bunches of pair backgrounds. Pick 10 BX randomly and calculate average BG in each cell, background Pick one BX background and generate one high energy electron. E BG + E electron - background, in each cell Apply electron finder. 11 cm LUMON

Pair Energy/bunch and RMS

High Energy Electron Detection 250 GeV e- BG Si Layers Pair Background 250 GeV Electron E bg + E electron - Deposited Energy (arb. Units)

Electron Detection Efficiency X (cm) Y (cm) GeV

Background Pileup What happens if we do not have single bunch time resolution? The detection efficiency does not degrade quickly, but the fake rake shoots up. Fake rate: 1 bx 3.2%

Energy Flow and Radiation DOSE Rate Study radiation environment for beam line elements. Identify hot spots. IR Quads are 5.7 cm radius BNL SC magnet.

Pair Energy Flow (e+e-, 20mrad X, SC Magnets) QDF1-A Detail Energy/bunch

Max. DOSE Rate in QDF1 QDF1 examined in 7.5° , 2 cm z cells; maximum dose plotted Max. DOSE rate ~100 MRad/year Solenoid field sweeps e+e- pairs UP and DOWN.

Max. DOSE Rate in LUMON and LOW-Z LUMON LOW-Z Max. DOSE rate ~70 Mrad/yearMax. DOSE rate ~30 Mrad/year

Other Backgrounds Particles reaching IP from beam-gas scattering (Keller) Bremsstrahlung#/train 1 nT Vacuum Electron Photon Coulomb Scattering Electron  *  *  Hadrons (Barklow) 56 events/train

Energy Flow from  hadrons and beam-gas  hadrons beam-gas Energy/train

Background in Central Tracker ~8600 e+/e- / train  hadrons 56 events / train

Charged Particle Occupancy in Si Tracker Occupancy = #hits/train / # channels Si strip width = 50 µm

Summary High energy electron can be identified in the pair background if single bunch time resolution is achieved, extending the veto capability to ~7 mrad. If multi-bunches are integrated, the fake rate becomes intolerable in ~3 bunches. Radiation level is 70 Mrad/year; Radiation hard detector must be developed. Energy flow analysis has not found any problems so far. > 0.1% occupancies in the central tracker from pairs and  *  * events.