COOL2017 - List of Keywords (pick-up)

Paper	Title	Other Keywords	Page
TUP16	Latest News from Stochastic Cooling Developments for the Collector Ring at FAIR	ion, damping, controls, vacuum	64
	R. Hettrich, A. Bardonner, R.M. Böhm, C. Dimopoulou, C. Peschke, A. Stuhl, S. Wunderlich GSI, Darmstadt, Germany F. Caspers ESI, Archamps, France F. Caspers CERN, Geneva, Switzerland
	The CR stochastic cooling system aims at fast 3D cooling of antiprotons, rare isotopes and stable ions. Because of the large apertures and the high gain needed to cool the hot secondary beams, damping within the 1-2 GHz band of the unwanted microwave modes propagating through the vacuum chambers is essential. It will be realised with UHV- compatible, resistively coated ceramic tubes and ferrites. The greatest challenge is increasing the signal to noise ratio for antiproton cooling by means of cryogenic movable (plunging) pickup electrodes, which follow the shrinking beam during cooling and then withdraw fast before the new injection. Linear motor drive units plunge synchroneously the pickup electrodes on both sides of the ion beam (horizontal/vertical). Their technical (mechanical, electrical, controls) concept and specification is summarized. Their performance has been demonstrated in successive measurements inside testing chambers at GSI. Recent simulations of the critical antiproton cooling with the designed system are shown. Longitudinal cooling and its simultaneous transverse cooling are studied with the Fokker-Planck code and with an analytical model, respectively.
	Poster TUP16 [4.474 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP16
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THA11	The HESR Stochastic Cooling System, Design, Construction and Test Experiments in COSY	ion, kicker, experiment, simulation	89
	R. Stassen, B. Breitkreutz, N. Shurkhno, H. Stockhorst FZJ, Jülich, Germany L. Thorndahl CERN, Geneva, Switzerland
	The construction phase of the stochastic cooling tanks for the HESR has started. Meanwhile two pickups (PU) and one kicker (KI) are fabricated. One PU and one KI are installed into the COSY ring for testing the new stochastic cooling system with real beam at various momenta. Small test-structures were already successfully operated at the Nuclotron in Dubna for longitudinal filter cooling but not for transverse cooling and as small PU in COSY. During the last COSY beam-time in 2017 additional transverse and ToF cooling were achieved. The first two series high power amplifiers were used for cooling and to test the temperature behavior of the combiner-boards at the KI. The system layout includes all components as planned for the HESR like low noise amplifier, switchable delay-lines and optical notch-filter. The HESR needs fast transmission-lines between PU and KI. Beside air-filled coax-lines, optical hollow fiber-lines are very attractive. First results with such a fiber used for the transverse signal path will be presented.
	Slides THA11 [11.863 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-THA11
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUP16

Latest News from Stochastic Cooling Developments for the Collector Ring at FAIR

ion, damping, controls, vacuum

64

R. Hettrich, A. Bardonner, R.M. Böhm, C. Dimopoulou, C. Peschke, A. Stuhl, S. Wunderlich
GSI, Darmstadt, Germany
F. Caspers
ESI, Archamps, France
F. Caspers
CERN, Geneva, Switzerland

The CR stochastic cooling system aims at fast 3D cooling of antiprotons, rare isotopes and stable ions. Because of the large apertures and the high gain needed to cool the hot secondary beams, damping within the 1-2 GHz band of the unwanted microwave modes propagating through the vacuum chambers is essential. It will be realised with UHV- compatible, resistively coated ceramic tubes and ferrites. The greatest challenge is increasing the signal to noise ratio for antiproton cooling by means of cryogenic movable (plunging) pickup electrodes, which follow the shrinking beam during cooling and then withdraw fast before the new injection. Linear motor drive units plunge synchroneously the pickup electrodes on both sides of the ion beam (horizontal/vertical). Their technical (mechanical, electrical, controls) concept and specification is summarized. Their performance has been demonstrated in successive measurements inside testing chambers at GSI. Recent simulations of the critical antiproton cooling with the designed system are shown. Longitudinal cooling and its simultaneous transverse cooling are studied with the Fokker-Planck code and with an analytical model, respectively.

Poster TUP16 [4.474 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP16

Export •

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

THA11

The HESR Stochastic Cooling System, Design, Construction and Test Experiments in COSY

ion, kicker, experiment, simulation

89

R. Stassen, B. Breitkreutz, N. Shurkhno, H. Stockhorst
FZJ, Jülich, Germany
L. Thorndahl
CERN, Geneva, Switzerland

The construction phase of the stochastic cooling tanks for the HESR has started. Meanwhile two pickups (PU) and one kicker (KI) are fabricated. One PU and one KI are installed into the COSY ring for testing the new stochastic cooling system with real beam at various momenta. Small test-structures were already successfully operated at the Nuclotron in Dubna for longitudinal filter cooling but not for transverse cooling and as small PU in COSY. During the last COSY beam-time in 2017 additional transverse and ToF cooling were achieved. The first two series high power amplifiers were used for cooling and to test the temperature behavior of the combiner-boards at the KI. The system layout includes all components as planned for the HESR like low noise amplifier, switchable delay-lines and optical notch-filter. The HESR needs fast transmission-lines between PU and KI. Beside air-filled coax-lines, optical hollow fiber-lines are very attractive. First results with such a fiber used for the transverse signal path will be presented.

Slides THA11 [11.863 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-THA11

Export •

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