impedance

Paper	Title	Other Keywords	Page
THAP13	Recent Developments for the HESR Stochastic Cooling System	pick-up, coupling, simulation, kicker	191
	R. Stassen, P. B. Brittner, R. Greven, H. Singer, H. Stockhorst FZJ, Jülich L. Thorndahl CERN, Geneva
	Two cooling systems will be installed in the High-Energy Storage Ring (HESR) of the future international Facility for Antiproton and Ion Research (FAIR) at the GSI in Darmstadt: an electron cooler (1.5-8 GeV/c) and a stochastic cooling system from 3.8 GeV/c up to the highest momentum of the HESR (15 GeV/c). Both cooler are mandatory for the operation of the HESR with the PANDA pellet target. The relative low aperture (89mm) of the HESR suggests fixed structures without a plunging system. An octagonal layout was chosen to increase the sensitivity of the electrodes. Two different types of electrodes were built and tested. We will report on the comparison of printed λ/4 loops and new broadband slot couplers.
THAP14	Pick-Up Electrode System for the CR Stochastic Cooling System	pick-up, simulation, cryogenics, dipole	194
	C. Peschke, F. Nolden GSI, Darmstadt
	The collector ring (CR) of the FAIR project will include a fast stochastic cooling system for exotic nuclei with a β of 0.83 and antiprotons with a β of 0.97. To reach a good signal to noise ratio of the pick-up even with a low number of particles, a cryogenic movable pick-up electrode system based on slotlines is under development. The sensitivity and noise properties of an electrode array has been calculated using field-simulation and equivalent circuits. For three-dimensional field measurements, an E-near-field probe moved by a computer controlled mapper has been used.
	Poster