COOL2013 - List of Authors (Petri, P.)

Paper

Title

Page

Progress of the Stochastic Cooling System of the Collector Ring

40

C. Dimopoulou, D. Barker, R.M. Böhm, A. Dolinskyy, B. J. Franzke, R. Hettrich, W. Maier, R. Menges, F. Nolden, C. Peschke, P. Petri, M. Steck
GSI, Darmstadt, Germany
L. Thorndahl
CERN, Geneva, Switzerland

An overview of the recent achievements and ongoing developments for the stochastic cooling system of the Collector Ring is given. In focus are the hardware developments as well as the progress in predicting the system performance. The system operates in the frequency band 1-2 GHz, it has to provide fast 3D cooling of antiproton, rare isotope and stable heavy ion beams. The main challenges are (i) the cooling of antiprotons by means of cryogenic movable pick-up electrodes and (ii) the fast two-stage cooling (pre-cooling by the Palmer method, followed by the notch filter method) of the hot rare isotopes. Recently, a novel code for simulating the cooling process in the time domain has been developed at CERN. First results for the momentum cooling for heavy ions in the CR will be shown in comparison with results obtained in the frequency domain with the Fokker-Planck equation.

Slides TUAM1HA01 [4.320 MB]

WEPPO19

The Novel Optical Notch Filter for Stochastic Cooling at the ESR

142

W. Maier, C. Dimopoulou, R. Hettrich, F. Nolden, C. Peschke, P. Petri, M. Steck
GSI, Darmstadt, Germany

In the frame of the development for the FAIR facility at GSI, notch filter cooling is essential for the stochastic cooling system of the CR (Collector Ring). A prototype notch filter based on optical components has been developed and built. The focus was to achieve sufficient notch depth and low dispersion of the filter transfer function. The compact optical notch filter was integrated into the ESR stochastic cooling system. Momentum cooling of heavy ion beams was successfully demonstrated. The layout of the notch filter as well as experimental results are presented

WEPPO20

RF-System for Stochastic Cooling in the FAIR Collector Ring

146

C. Peschke, R.M. Böhm, C. Dimopoulou, F. Nolden, P. Petri
GSI, Darmstadt, Germany

The collector ring (CR) of the FAIR project is designed for fast stochastic cooling of rare isotope and antiproton beams injected at different velocities. A flexible rf signal processing scheme for the stochastic cooling system will be presented. It includes cooling with time of flight (TOF), notch filter and Palmer methods. A Palmer pick-up with Faltin electrodes is foreseen for pre-cooling of hot rare isotope beams. For TOF and notch filter methods, a horizontal and a vertical pick-up tank with movable cryogenic slotline electrodes for ions with two different velocities is under development. The layout of this slotline pick-up tank will also be presented.

Poster WEPPO20 [2.410 MB]

Paper	Title	Page
TUAM1HA01	Progress of the Stochastic Cooling System of the Collector Ring	40
	C. Dimopoulou, D. Barker, R.M. Böhm, A. Dolinskyy, B. J. Franzke, R. Hettrich, W. Maier, R. Menges, F. Nolden, C. Peschke, P. Petri, M. Steck GSI, Darmstadt, Germany L. Thorndahl CERN, Geneva, Switzerland
	An overview of the recent achievements and ongoing developments for the stochastic cooling system of the Collector Ring is given. In focus are the hardware developments as well as the progress in predicting the system performance. The system operates in the frequency band 1-2 GHz, it has to provide fast 3D cooling of antiproton, rare isotope and stable heavy ion beams. The main challenges are (i) the cooling of antiprotons by means of cryogenic movable pick-up electrodes and (ii) the fast two-stage cooling (pre-cooling by the Palmer method, followed by the notch filter method) of the hot rare isotopes. Recently, a novel code for simulating the cooling process in the time domain has been developed at CERN. First results for the momentum cooling for heavy ions in the CR will be shown in comparison with results obtained in the frequency domain with the Fokker-Planck equation.
	Slides TUAM1HA01 [4.320 MB]

WEPPO19	The Novel Optical Notch Filter for Stochastic Cooling at the ESR	142
	W. Maier, C. Dimopoulou, R. Hettrich, F. Nolden, C. Peschke, P. Petri, M. Steck GSI, Darmstadt, Germany
	In the frame of the development for the FAIR facility at GSI, notch filter cooling is essential for the stochastic cooling system of the CR (Collector Ring). A prototype notch filter based on optical components has been developed and built. The focus was to achieve sufficient notch depth and low dispersion of the filter transfer function. The compact optical notch filter was integrated into the ESR stochastic cooling system. Momentum cooling of heavy ion beams was successfully demonstrated. The layout of the notch filter as well as experimental results are presented

WEPPO20	RF-System for Stochastic Cooling in the FAIR Collector Ring	146
	C. Peschke, R.M. Böhm, C. Dimopoulou, F. Nolden, P. Petri GSI, Darmstadt, Germany
	The collector ring (CR) of the FAIR project is designed for fast stochastic cooling of rare isotope and antiproton beams injected at different velocities. A flexible rf signal processing scheme for the stochastic cooling system will be presented. It includes cooling with time of flight (TOF), notch filter and Palmer methods. A Palmer pick-up with Faltin electrodes is foreseen for pre-cooling of hot rare isotope beams. For TOF and notch filter methods, a horizontal and a vertical pick-up tank with movable cryogenic slotline electrodes for ions with two different velocities is under development. The layout of this slotline pick-up tank will also be presented.
	Poster WEPPO20 [2.410 MB]