T.Fujita, K.Umemori, K.Yoshida V.Ababiy, A.P.Potylitsin, I.E.Vnukov

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Presentation transcript:

T.Fujita, K.Umemori, K.Yoshida V.Ababiy, A.P.Potylitsin, I.E.Vnukov Positron-Production Experiment Using 8-GeV Channeling Electrons in a Crystal-Tungsten Target T.Suwada, S.Anami, A.Enomoto, K.Furukawa, K.Kakihara, T.Kamitani,Y.Ogawa, S.Ohsawa, T.Oogoe Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan H.Okuno Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan T.Fujita, K.Umemori, K.Yoshida Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-8526, Japan R.Hamatsu, K.Sasahara Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji-shi, Tokyo 192-0397, Japan V.Ababiy, A.P.Potylitsin, I.E.Vnukov Nuclear Physics Institute, Tomsk Polytechnic University, 634050, P.O.Box 25, Tomsk, Russia SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Motivation High-intensity positron sources are required for future linear colliders and B-factories. Conventional methods using amorphous heavy metals limit to increase the intensity of primary electron beams due to the heat load on the target. New method using the processes of coherent bremsstrahlung (CB) and channeling radiation (CR) is one of the bright schemes for high-intensity e+ sources. SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Motivation (cont.) Theoretically unified treatment taking into account both processes of CR and CB has not yet been established on the simulation. More experimental data are expected to clearly understand the elementary physical processes of the CR and CB, and they are also required to develop the design of a real-type positron source. SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Historical View of Our Experiment SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Channeling Radiation & Coherent Bremsstrahlung SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

New Positron Production Scheme SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Setup SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Linac Beam Line & Experimental Setup SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Condition Electron Beam: • Beam Energy = 8 GeV • Angular Spread ~72 mrad (Horizontal), ~15 mrad (Vertical) • Transverse Beam Size ~1 mm (FWHM) in diameter • Beam Charge = 0.2 nC/bunch • Bunch Length (Single Bunch) ~10 ps (FWHM) • Beam Repetition = 2Hz Angular Spread of the Electron Beam at the Positron Target • F ~ 0.1 mrad < Fc (due to multiple scattering by a vacuum window(100mm-thick SUS)) Critical Angle for the Channeling Condition at the Positron Target • Fc ~ 0.43 mrad @8GeV (Linhard Angle) SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Condition (cont.) Positron-Production Targets: • Crystal Tungsten Target : 2.2mm and 9mm thickness • Amorphous Tungsten Target : 2mm and 4mm thick (for the purpose of hybrid targets) • Amorphous Tungsten Target: 3-18mm (3mm step) thickness (for the e+ production yield calibration) Detected Momentum Range • Pe+ <30 MeV/c Positron Detectors •Lead-Glass Calorimeter and Acrylic Cherenkov Counter Beam Monitors •Wall-current monitor for the beam-charge measurement and screen monitor for the beam-profile measurement SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Results: Rocking Curves (Crystal Axis <111>) for 2 Experimental Results: Rocking Curves (Crystal Axis <111>) for 2.2mmt and 9mmt Wcs SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Results: Momentum dependence of the Positron-Yield Enhancement (=PYon-axis/ PYoff-axis) SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Results: Momentum dependence of the Positron-Yield Enhancement (=PYon-axis/ PYoff-axis) SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Results: Positron Yields vs. Target Thickness SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Results: Simulation check for amorphous W targets using the EGS4 code SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Experimental Results: Experiment vs. Simulation SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)

Conclusions º Positron production experiment has been successfully performed at the KEKB 8-GeV electron linac. º Enhancement (En) and momentum dependence of the e+ yield from 8-GeV channeling electrons • En=5.1 0.1 (2.2mmt Wc), 1.7 0.1 (9mmt Wc)@Pe+=20MeV/c • the enhancement decreases as the target thickness increases. • the positron yield of the 9mmt crystal W is slightly larger than that of a 15mmt amorphous W. • the result of the momentum dependence indicates that as the momentum becomes low, the enhancement is getting larger. º The present simulation results can not agree with the experiment. More sophisticated simulation code is under development. SAST01@Osaka University, Osaka, October 29-31, 2001 Tsuyoshi Suwada (tsuyoshi.suwada@kek.jp)