Survey of LEPS at TPC Wen-Chen Chang. Charge the flux, energies, and polarizations of the beams that can produce at TPS. Since it will not be tunable,

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Presentation transcript:

Survey of LEPS at TPC Wen-Chen Chang

Charge the flux, energies, and polarizations of the beams that can produce at TPS. Since it will not be tunable, how easy it will be for you change your laser system to get different beam energy? the cost for the detector, targets (including polarized ones), laser systems, and electronics, how can you compete with MAIMI II, Jlab, and SPring8 as JW asked? currently planned exps. on Roper resonance.

Photon Flux Laser and electron Laser & Waveleng th Output Power Repetition Rate Pulse length Electron Current & Energy Photon Flux & Emax SPring-8 Paladin 355 nm 8W80MHz5ps100mA 8 GeV 700 KHz 2.5 GeV TPS INDIGO-DUV 193 nm 2mW5KHz15ns300mA 3.3 GeV 0.7 KHz 0.8 GeV TPS AVAI 266 nm 3W100KHz25ns300mA 3.3 GeV 1.2 MHz 0.6 GeV

Cost Estimate Laser: $200K USD / per unit Target: un-polarized LH2/LD2 target $20K / Polarized HD target $1M Detector: crystal ball with 4  coverage, my guess is $300K – 500K Electronics: $500K In total: –Unpolarized: $1.2 M –Polarized: $2.2 M

LEPS2 Higher photon flux: 10MHz Detectors with large acceptance: move E949 detector system from BNL to Spring- 8 Higher photon energy: 3.5 GeV

MAMIC

Experimental set-up  Tagged photon beam Mainz: m   E   800 MeV ( Photon 10**8 Hz ) Bonn: 0.6 GeV  E   2.9 GeV  Circularly polarized photons Bremsstrahlung of linearly polarized electrons  Longitudinally polarized Protons/Deuterons Frozen spin butanol target (Bonn, Bochum, Nagoya)  Mainz: DAPHNE detector (Pavia, Saclay) + forward angle detectors (Pavia, Mainz, Tübingen, Gent)  Bonn: GDH Detector (Erlangen, Tübingen, Gent)  Large acceptance hadron detectors