COOL2015 - List of Authors (Dimopoulou, C.)

Paper	Title	Page
MOYAUD04	Stochastic Cooling Developments for the Collector Ring at FAIR	25
	C. Dimopoulou, D. Barker, R.M. Böhm, R. Hettrich, W. Maier, C. Peschke, A. Stuhl, S. Wunderlich GSI, Darmstadt, Germany L. Thorndahl CERN, Geneva, Switzerland
	A Status report on the ongoing developments for the demanding stochastic cooling system of the Collector Ring 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, testing and integrating the hardware is discussed.
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TUPF07	Progress of the RF-System Developments for Stochastic Cooling at the FAIR Collector Ring	108
	S. Wunderlich, R.M. Böhm, C. Dimopoulou, W. Maier, R. Menges, C. Peschke GSI, Darmstadt, Germany
	An overview of the recent developments regarding the RF signal processing for the stochastic cooling system of the Collector Ring is given. In focus are the developments of generic RF components which can be used at different locations within the signal paths between the pick-up and kicker tanks in the frequency band 1-2 GHz. Two of these components are discussed in detail, a power meter with high dynamic range (+9 dBm to -68 dBm), low phase distortion (± 0.75deg(max)) and low attenuation (≤ 0.4dB) and a variable phase shifter with exceptionally flat amplitude (± 0.4dB(max)) and linear phase response (± 3.5deg(max)). Furthermore, we present the status and the newest enhancements of other components with stringent specifications, such as optical notch filters, pick-up module controllers, variable attenuators, beta-switch combiners and the power amplifiers at the kickers.
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WEXAUD04	Electron Cooling at GSI and FAIR – Status and Latest Activities	136
	J. Roßbach, C. Dimopoulou, M. Steck GSI, Darmstadt, Germany
	The status, function and operation parameters of the existing and future electron coolers at GSI and FAIR are presented. We report on the progress of the ongoing recommissioning of the former CRYRING storage ring with its electron cooler at GSI. First systematic results on the cooling of a 400 MeV proton beam during the last ESR beamtime are discussed. Motivated by the demands of the experiments on high stability, precise monitoring and even absolute determination of the velocity of the electrons i.e. the velocity of the electron- cooled ion beams, high precision measurements on the electron cooler voltage at the ESR were carried out towards the refurbishment of the main high-voltage supply of the cooler. Similar concepts are underway for the CRYRING cooler high-voltage system.
	Slides WEXAUD04 [23.579 MB]
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FRWAUD03	Design of the Palmer Pickup for Stochastic Pre-Cooling of Hot Rare Isotopes at the CR	175
	D. Barker, C. Dimopoulou, C. Peschke GSI, Darmstadt, Germany L. Thorndahl CERN, Geneva, Switzerland
	We report on the design of a Faltin type pickup for the stochastic pre-cooling of rare isotope beams at 740 MeV/u, using a bandwidth of 1-2 GHz, for the Collector Ring (CR) in the FAIR project at GSI. The design difficulties inherent in Faltin rails at these frequencies are described. Measurements of prototypes and HFSS simulations are compared, to check the simulations, and show good agreement. The pickup impedance and signal output phase with respect to ions traveling at 0.83c are simulated and presented for the final design both with and without the use of damping material, showing the need to damp unwanted modes present in the beam chamber.
	Slides FRWAUD03 [5.257 MB]
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Paper

Title

Page

Stochastic Cooling Developments for the Collector Ring at FAIR

25

C. Dimopoulou, D. Barker, R.M. Böhm, R. Hettrich, W. Maier, C. Peschke, A. Stuhl, S. Wunderlich
GSI, Darmstadt, Germany
L. Thorndahl
CERN, Geneva, Switzerland

A Status report on the ongoing developments for the demanding stochastic cooling system of the Collector Ring 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, testing and integrating the hardware is discussed.

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

TUPF07

Progress of the RF-System Developments for Stochastic Cooling at the FAIR Collector Ring

108

S. Wunderlich, R.M. Böhm, C. Dimopoulou, W. Maier, R. Menges, C. Peschke
GSI, Darmstadt, Germany

An overview of the recent developments regarding the RF signal processing for the stochastic cooling system of the Collector Ring is given. In focus are the developments of generic RF components which can be used at different locations within the signal paths between the pick-up and kicker tanks in the frequency band 1-2 GHz. Two of these components are discussed in detail, a power meter with high dynamic range (+9 dBm to -68 dBm), low phase distortion (± 0.75deg(max)) and low attenuation (≤ 0.4dB) and a variable phase shifter with exceptionally flat amplitude (± 0.4dB(max)) and linear phase response (± 3.5deg(max)). Furthermore, we present the status and the newest enhancements of other components with stringent specifications, such as optical notch filters, pick-up module controllers, variable attenuators, beta-switch combiners and the power amplifiers at the kickers.

Export •

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

WEXAUD04

Electron Cooling at GSI and FAIR – Status and Latest Activities

136

J. Roßbach, C. Dimopoulou, M. Steck
GSI, Darmstadt, Germany

The status, function and operation parameters of the existing and future electron coolers at GSI and FAIR are presented. We report on the progress of the ongoing recommissioning of the former CRYRING storage ring with its electron cooler at GSI. First systematic results on the cooling of a 400 MeV proton beam during the last ESR beamtime are discussed. Motivated by the demands of the experiments on high stability, precise monitoring and even absolute determination of the velocity of the electrons i.e. the velocity of the electron- cooled ion beams, high precision measurements on the electron cooler voltage at the ESR were carried out towards the refurbishment of the main high-voltage supply of the cooler. Similar concepts are underway for the CRYRING cooler high-voltage system.

Slides WEXAUD04 [23.579 MB]

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FRWAUD03

Design of the Palmer Pickup for Stochastic Pre-Cooling of Hot Rare Isotopes at the CR

175

D. Barker, C. Dimopoulou, C. Peschke
GSI, Darmstadt, Germany
L. Thorndahl
CERN, Geneva, Switzerland

We report on the design of a Faltin type pickup for the stochastic pre-cooling of rare isotope beams at 740 MeV/u, using a bandwidth of 1-2 GHz, for the Collector Ring (CR) in the FAIR project at GSI. The design difficulties inherent in Faltin rails at these frequencies are described. Measurements of prototypes and HFSS simulations are compared, to check the simulations, and show good agreement. The pickup impedance and signal output phase with respect to ions traveling at 0.83c are simulated and presented for the final design both with and without the use of damping material, showing the need to damp unwanted modes present in the beam chamber.

Slides FRWAUD03 [5.257 MB]

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