pick-up

Paper	Title	Other Keywords	Page
MOIO05	Status of the 2 MeV Electron Cooler for COSY/HESR	electron, vacuum, gun, proton	15
	J. Dietrich, V. Kamerdzhiev FZJ, Jülich M. I. Bryzgunov, A. D. Goncharov, V. M. Panasyuk, V. V. Parkhomchuk, V. B. Reva, D. N. Skorobogatov BINP SB RAS, Novosibirsk
	The 2 MeV electron cooling system for COSY-Juelich was proposed to further boost the luminosity even in presence of strong heating effects of high-density internal targets. The project is funded since mid 2009. The design and construction of the cooler is accomplished in cooperation with the Budker Institute of Nuclear Physics in Novosibirsk, Russia. The 2 MeV cooler is also well suited in the start up phase of the High Energy Storage Ring (HESR) at FAIR in Darmstadt. It can be used for beam cooling at injection energy and is intended to test new features of the high energy electron cooler for HESR. The infrastructure necessary for the operation of the cooler in the COSY ring (radiation shielding, cabling, water cooling etc.) is established. The electron beam commissioning at BINP Novosibirsk is scheduled to start at May of 2011. First results are reported. Final commissioning at COSY-Juelich is planned for the end of 2011.
	Slides
THIOA02	The First Commission Results of the High Voltage Magnetized Cooler for COSY	electron, gun, ion, power-supply	37
	V. B. Reva, N. Alinovsky, A. M. Batrakov, T. V. Bedareva, E. A. Bekhtenev, O. V. Belikov, V. N. Bocharov, V. V. Borodich, M. I. Bryzgunov, A. V. Bubley, V. A. Chekavinskiy, V. G. Cheskidov, B. A. Dovzhenko, A. Erokhin, G. A. Fatkin, M. G. Fedotov, A. D. Goncharov, K. Gorchakov, V. K. Gosteev, I. A. Gusev, A. V. Ivanov, G. V. Karpov, Y. I. Koisin, M. N. Kondaurov, A. Kryuchkov, A. D. Lisitsyn, I. A. Lopatkin, V. R. Mamkin, A. S. Medvedko, V. M. Panasyuk, V. V. Parkhomchuk, I. V. Poletaev, V. A. Polukhin, A. Yu. Protopopov, D. N. Pureskin, A. A. Putmakov, E. P. Semenov, D. V. Senkov, D. N. Skorobogatov, N. P. Zapiatkin BINP SB RAS, Novosibirsk
	The electron cooler of a 2 MeV for COSY storage ring FZJ is assembling in BINP. The cooler is designed on the classic scheme of low energy coolers like cooler CSRm, CSRe, LEIR that was produced in BINP before. The electron beam is transported inside the longitudinal magnetic field along whole trajectory from an electron gun to a collector. This optic scheme is stimulated by the wide range of the working energies 0.1(0.025)- 2 MeV. The electrostatic accelerator consists of 34 individual unify section. Each section contains two HV power supply (plus/minus 30 kV) and power supply of the magnetic coils. The electrical power to each section is provided by the cascade transformer. The cascade transformer is the set of the transformer connected in series with isolating winding. This paper describes the status of the electron cooling assembling.
	Slides
TUIOB02	Simulations of Stochastic Cooling of Antiprotons in the Collector Ring CR	kicker, antiproton, betatron, emittance	58
	C. Dimopoulou, A. Dolinskii, T. Katayama, F. Nolden, C. Peschke, M. Steck GSI, Darmstadt D. Möhl, L. Thorndahl CERN, Geneva
	The Collector Ring at FAIR will be equipped with pertinent stochastic cooling systems in order to achieve fast cooling of the hot secondary beams, antiprotons and rare isotopes, thus profiting from the repetition rate of the SIS100 synchrotron. Detailed simulations of the system performance are needed for optimization as well as input for the users of the CR pre-coooled beams, e.g. HESR. We presently focus on the antiproton cooling in the band 1-2 GHz. After a short overview, results from Fokker-Planck simulations with the CERN code of the momentum cooling of antiprotons will be presented. The performance of the betatron cooling of antiprotons, which has to proceed simultaneously with the momentum cooling, was calculated separately by means of an analytical model. First results and their implications will be discussed, including an outlook to future simulation work.
	Slides
TUCOB01	Stochastic Cooling Project at the Experimental Storage Ring, CSRe at IMP	kicker, simulation, vacuum, impedance	64
	J. X. Wu, J. W. Xia, Y. Zhang IMP, Lanzhou F. Caspers CERN, Geneva T. Katayama, F. Nolden GSI, Darmstadt
	Stochastic cooling at the experimental Cooler Storage Ring, CSRe at the Institute of Modern Physics (IMP) in China, will be used mainly for the experiments with radioactive fragment beams. Those RI beams arrive from the fragment separator with the emittance of 20-50 mm. mrad and the momentum spread Dp/p of ± 0.5~1.0 %. The equipped electron cooler is not able to cool down this hot beam within enough short period. Stochastic cooling is effective for these RI beams to reduce the emittance to less than 5 mm.mrad and Dp/p of 5·10-4 within 2-20 sec. After the stochastic pre-cooling, the electron cooling will further cool down the emittance and Dp/p within several seconds. The paper gives the design of the stochastic cooling system and the simulation results. The new developed forward traveling wave structure is presented as well as the measured results of test model.
	Slides
TUPS10	Magnetic System of Electron Cooler for COSY	electron, dipole, simulation, power-supply	114
	V. M. Panasyuk, M. I. Bryzgunov, A. V. Bubley, V. K. Gosteev, V. V. Parkhomchuk, V. B. Reva BINP SB RAS, Novosibirsk
	Cooler magnetic system for COSY is described. Electron beam energy range is wide (24 keV- 2 MeV), typical bending radiuses of electrons are near 1 m, typical magnetic fields are 0.5 – 2 kG. Under such conditions transport channels with longitudinal magnet field for motion of electrons from high voltage terminal of cascade transformer into cooling section and their return for recuperation are discussed. Results of Hall device measurements are compared with suitable computations. Also some steps were taken for improve of the magnetic field line straightness in the cooling section.
TUPS15	The Stochastic Cooling System of HESR	controls, impedance, accumulation, kicker	129
	R. Stassen, H. Stockhorst FZJ, Jülich T. Katayama GSI, Darmstadt L. Thorndahl CERN, Geneva
	The HESR is the high energy storage ring (1.5-15 GeV/c) for antiprotons at the FAIR facility (Facility for Antiprotons and Ion Research) in Darmstadt (GSI). Stochastic cooling in the HESR is necessary not only during the experiments to fulfill the beam requirements, but also during the accumulation due to the postponed RESR. Extensive simulations and prototype measurements have been carried out to optimize the HESR stochastic cooling system with the new slot-ring couplers. The system design is now in the final construction phase for the mechanical tank layout and all active RF-components. First results of the optical notch-filter with automated frequency control and the 4-6 GHz slot-ring couplers will be presented.
TUPS16	An Improved Forward Travelling Wave Structure Design for Stochastic Cooling at Experimental Cooler Storage Ring (CSRe) at the Institute of Modern Physics (IMP) in China	impedance, kicker, simulation, storage-ring	132
	Y. Zhang, J. X. Wu IMP, Lanzhou F. Caspers, L. Thorndahl CERN, Geneva T. Katayama, F. Nolden GSI, Darmstadt
	An improved forward travelling wave (TW) structure as the pick-up/kicker is designed for the stochastic cooling to match the field wave’s (phase) velocity to that of the beam. The theoretical analysis is performed together with the simulations of the propagation characteristics. Using CST Microwave Studio (CST MWS), the simulated results, including phase velocity, characteristics impedance, and distributions of the longitudinal fields, are implemented and compared with the experimented results. The improved forward TW structure can be satisfied the requirements of stochastic cooling project at CSRe, which the phase velocity is closed to 0.70 (matching the desired beam energy of 400 MeV/u) and the characteristics impedance is 17 ohm.