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Medium and High Energy Photons for Nuclear Particle Physics Schin Daté Accelerator Division, SPring-8/JASRI Advanced Photons and Science Evolution 2010 June 14-18, 2010, Osaka Japan
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Previous talks which includes laser backscattering beamlines T. Shima: New Subaru Y. Ohashi: LEPS/LEPS2 W. Tornow: HI S W.C. Chang: LEPS M. Niiyama: LEPS/LEPS2
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My talk: I. High Energy Production in SPring-8 II. Intense 10 MeV Production in Light Sources Additional options to future backscattering beamlines
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Production of high energy gamma rays
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HELP production by X-ray re-injection
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multilayer mirror
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Choice of Undulator Portion of the fundamental= kG
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Yield of X-ray photons d ˙ N ph d /I e ( )
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Re-focussing Thin undulator approximation e-e- 275x2 m 6x2 m ~100 rad Can s be mm 2 ? In principle, yes. spherical mirror
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Bunch mode dominance... 100 rad 60 cm h ~ 275 m e-e- v ~ 6 m
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Yield of High Energy Gamma Notation:, Undulator (K=5~6, =1.1 m, 4 periods) : reinjection efficiency for Electron beam emittance + re-focussing Beam current: 100 mA/e =.,. 50%
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Summry of part I Provided an undulator with high reflectable (R > 0.5)spherical mirror for 100 eV photons with timing adjustment system (mirror position z = 24 +- 2 m, dz = 6mm) We may obtain in principle. The number may increase by an order of magnitude for the future refinement of the storage ring.
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Intense 10 MeV Production in Light Sources II
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Well known facts about Compton back scattering Controlled Polarization(3) ~ flat (1) Energy, Angle(2), = 0.5 b I = 100 mA l = 10 m for Yield(4)
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Progress in laser technology Heat load limit ~ 20 MW / mm 100 kW output is cleared in this way bundled fiber line of, say, cm is possible to make Fiber Laser Single mode CW output power (W) year 15 m core Yb fiber laser (IPG): 1030 ~ 1050 nmCW single mode 2 kW multimode 20 kW Polarization?
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Eg_max for CO2
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2. Production of Intense 10 MeV Rays (1)Enegy aperture Spring-8CLSDFELLMAX-IVNSLS-II 8 2.90.24-1.2 3 3 2436 285 64 96 1320 16 0.876 42 keV 0.712 0.816 4/3 2.74 17.1 1.7 4.04 154 45 19 @ 500 MeV 30 @ 1.2 GeV 91
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(2) Longitudinal beam quality = I = 100 mA Spring-8CLSDFELLMAX-IVNSLS-II 4.80.57 0.36 0.96 2.6 4.21.94.3 4 9.7 No serious effect on the longitudinal beam quality
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Summary of Part II There is no crucial problem to producee very intense (~ 10^11 /s) 10 MeV gamma rays in 3 GeV light sources including CLS, MAX IV and NSLS-II.. There are technologies available to realize the intense gamma production. Now is the adequate time to consider such a possibility seriously.
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Conclusion I. We may think seriously about quasi-monochromatic g beamline with Eg_max ~ Ee and Ng ~ 10^6 /s as an option to future beamlines in high energy synchrotron light sources. II. There is no crucial problem to producee very intense (~ 10^11 /s) 10 MeV gamma rays in new 3 GeV light sources.
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-------- Backup --------
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reinjection schemes
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Why Do We Want 10^11 /s Photons? = 10 g / cm^3 Because many interesting elementary interactions occur with ~ pb l = 1 cm = 1 pb for
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Old proposal
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Optical param bl33
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optical parameters
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beam divergence BCS ~ 64 rad beam divergence in LSS BL is dominated by Compton scattering. xx =3.4 10 -9 radm yy xx,=0.2 % () <= 33LEPLSS [ rad] 5823 [ rad] 1.81.2 [mm] 0.340.30 [ m] 12 Contributions are wighted for Gaussian laser beam. Values are valid for the laser waist radius > 0.5 mm.
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Angular Distribution
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Polarization
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Energy
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