COOL2021 - List of Authors (Böhm, R.M.)

Paper	Title	Page
S301	Stochastic Cooling System for the Collector Ring at FAIR
	C. Dimopoulou, A. Bardonner, R.M. Böhm, O.E. Gorda, R. Hettrich, C. Peschke, S. Wunderlich, C. Zhang GSI, Darmstadt, Germany B. Breitkreutz, N. Shurkhno, R. Stassen FZJ, Jülich, Germany
	An overview on the demanding stochastic cooling system of the Collector Ring at FAIR is given. 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 isotope beams. Progress in designing, manufacturing, testing and integrating the hardware is discussed. The performance of the stochastic cooling processes is predicted by dedicated simulations (rate equations for transverse cooling, Fokker Planck approach for longitudinal cooling).
	Slides S301 [12.697 MB]
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P2003	Control Features of the Plunging Pick-Up Electrodes With Real Time Digital Data Processing	92
	R. Hettrich, R.M. Böhm, C. Dimopoulou, C. Peschke GSI, Darmstadt, Germany
	The Pick-Up electrodes of the CR Stochastic cooling system can be positioned very precisely and fast. In the normal operating state, a function without jerk provides the set values for an underlying position control loop. Moving the electrodes however with the drives within a narrow tank can be very challenging. For installation and service, we need a manual control facility, which allows to steer the mobile drive rods slowly to the electrodes. Hence eight hand wheels, one at each drive, will make manual positioning of each. A bus-shaped network from several wheel-controllers to a central computer was implemented. A smooth and data saving transmission can be achieved by applying approved techniques from real time data processing. The equipment of analogue drive systems with digital regulation and controls allows to change the proportion between drive distance and angle of rotation of a hand wheel only by means of software.
	Poster P2003 [1.835 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P2003
About •	paper received ※ 22 October 2021 paper accepted ※ 22 November 2021 issue date ※ 10 November 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

S301

Stochastic Cooling System for the Collector Ring at FAIR

C. Dimopoulou, A. Bardonner, R.M. Böhm, O.E. Gorda, R. Hettrich, C. Peschke, S. Wunderlich, C. Zhang
GSI, Darmstadt, Germany
B. Breitkreutz, N. Shurkhno, R. Stassen
FZJ, Jülich, Germany

An overview on the demanding stochastic cooling system of the Collector Ring at FAIR is given. 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 isotope beams. Progress in designing, manufacturing, testing and integrating the hardware is discussed. The performance of the stochastic cooling processes is predicted by dedicated simulations (rate equations for transverse cooling, Fokker Planck approach for longitudinal cooling).

Slides S301 [12.697 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

P2003

Control Features of the Plunging Pick-Up Electrodes With Real Time Digital Data Processing

92

R. Hettrich, R.M. Böhm, C. Dimopoulou, C. Peschke
GSI, Darmstadt, Germany

The Pick-Up electrodes of the CR Stochastic cooling system can be positioned very precisely and fast. In the normal operating state, a function without jerk provides the set values for an underlying position control loop. Moving the electrodes however with the drives within a narrow tank can be very challenging. For installation and service, we need a manual control facility, which allows to steer the mobile drive rods slowly to the electrodes. Hence eight hand wheels, one at each drive, will make manual positioning of each. A bus-shaped network from several wheel-controllers to a central computer was implemented. A smooth and data saving transmission can be achieved by applying approved techniques from real time data processing. The equipment of analogue drive systems with digital regulation and controls allows to change the proportion between drive distance and angle of rotation of a hand wheel only by means of software.

Poster P2003 [1.835 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P2003

About •

paper received ※ 22 October 2021 paper accepted ※ 22 November 2021 issue date ※ 10 November 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)