Dietrich, J.

Paper	Title	Page
MOIO04	Beam Cooling at HESR in the FAIR Project
	D. Prasuhn, J. Dietrich, A. Lehrach, B. Lorentz, R. Maier, R. Stassen, H. Stockhorst FZJ, Jülich
	The High Energy Storage Ring (HESR) at the FAIR accelerator facility in Darmstadt will accumulate and accelerate anti-protons in the energy range between 1.5 GeV/c and 15 GeV/c. The design is optimized to fulfill the requirements of the internal experiment PANDA. For accumulation and to fulfill the demanding requirements of the experiment concerning momentum spread, and for the required long beam lifetime both electron and stochastic cooling are necessary. Simulation results and prototype measurements of the stochastic cooling equipment and simulations of the high energy electron cooling concept will be presented.
	Slides
MOIO05	Status of the 2 MeV Electron Cooler for COSY/HESR	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
TUPS03	Closed Orbit Correction in 2 MeV Electron Cooler Section at COSY-Juelich	92
	L. J. Mao, J. Dietrich, V. Kamerdzhiev, B. Lorentz, H.-J. Stein FZJ, Jülich
	A 2 MeV magnetized electron cooling system will be installed in COSY to boost the luminosity for future high density internal target experiments. For an effective electron cooling, the proton beam and electron beam have to overlap coaxially, it lead to the necessity of a good orbit correction in cooler section. Since the toroid magnets, the proton beam orbit distortion is anti-symmetric in horizontal plane. With steerers at each side of cooler, the proton beam can be made coaxial in the cooler and the deflection can be compensated. The distortion caused by bending coils in toroid is symmetric in vertical plane. A four-bump method is suggested for correction. Using the magnetic field data measured in BINP, we calculated the orbit distortion of proton beam at injection energy, and investigated the scheme of closed orbit correction. The simulation of orbit distortion and result of the correction are presented in this paper.
TUPS05	Simulation of High-Energy Electron Cooling at COSY with BETACOOL Program	95
	L. J. Mao, J. Dietrich FZJ, Jülich
	A 2 MeV electron cooling device will be installed at COSY in order to boost the luminosity of pellet target experiments. The magnetized electron cooling technique is used to compensate the energy loss and emittance growth for future COSY pellet target experiments. In this article, a numerical simulation of cooling process is performed with BETACOOL code. The cooling time is calculated for variant cooler setting parameters. The intrabeam scattering (IBS) and target effect are essential for prediction of equilibrium beam parameters. The influence of the pellet target on the beam parameters is demonstrated.
TUPS12	Optical Electron Beam Diagnostics for Relativistic Electron Cooling Devices	121
	T. Weilbach HIM, Mainz K. Aulenbacher IKP, Mainz J. Dietrich FZJ, Jülich
	For the cooling of proton and Ion beams a well established overlap between cooling beam and circulating beam is needed. The new relativistic electron cooling devices have special demands on the diagnostics which can be used to characterize the cooling beam. Due to high voltage breakdowns they only allow a very small beam loss so non-invasive beam diagnostic methods are necessary. A system based on beam induced uorescence (BIF) was installed at the 100 keV polarized test setup at the Mainzer Mikrotron (MAMI). First results of the measured photon yield as a function of beam current and residual gas pressure will be presented. In addition a Thomson scattering experiment is planned at the same test setup. This method enables the measurement of other observables of the cooling beam like the electron beam energy or the electron temperature. The design of the experiment as well as the challenges will be discussed.