COOL2015 - List of Keywords (pick-up)

Paper	Title	Other Keywords	Page
MOYAUD02	Stochastic Cooling of Heavy Ions in the HESR	ion, heavy-ion, impedance, target	15
	R. Stassen, B. Breitkreutz, G. Schug, H. Stockhorst FZJ, Jülich, Germany
	Due to the modularized start version (MSV) of the FAIR project with the postponed NESR, the HESR (High Energy Storage Ring) became very attractive for experiments with heavy ions. Although the HESR is optimized for the storage of antiprotons it is also well suited for heavy-ion beams with slightly changes in the optics. Within the MSV only stochastic cooling and no e-cooling will be available, but even the main 2-4 GHz stochastic cooling system will be capable to fulfill the beam requirements for heavy ions. Most critical parts of the active elements are the high power amplifiers. The stochastic cooling amplifiers for the HESR will be based on new GaN devices. Nonlinearities of these devices necessitate a dedicated analysis for use in stochastic cooling systems.
	Slides MOYAUD02 [5.720 MB]
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MOYAUD03	Stochastic Cooling System for HESR - Theoretical and Simulation Studies	kicker, ion, antiproton, target	20
	H. Stockhorst, B. Lorentz, R. Maier, D. Prasuhn, R. Stassen FZJ, Jülich, Germany T. Katayama Nihon University, Narashino, Chiba, Japan
	The High-Energy Storage Ring (HESR) is part of the upcoming International Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt. The HESR dedicates to the field of high-energy antiproton physics to explore the research areas of charmonium spectroscopy, hadronic structure, and quark-gluon dynamics with high-quality beams over a broad momentum range from 1.5 to 15 GeV/c. The facility provides the combination of powerful phase-space cooled antiproton beams and internal Pellet or gas jet targets to achieve the requirements of the experiment PANDA in terms of beam quality and luminosity. Recently, the feasibility of the HESR has been investigated for the application of cooled heavy ion beams with the special emphasis on the experimental program of the SPARC collaboration at FAIR. In this contribution an outline of the Fokker-Planck approach and particle tracking for momentum cooling assisted by a barrier bucket cavity with an internal target is given. A comparison of the filter and filter-less TOF cooling techniques including beam feedback is presented. Simulation and experimental studies at COSY to verify the predictions of the cooling theory complete the contribution.
	Slides MOYAUD03 [4.508 MB]
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MOYAUD04	Stochastic Cooling Developments for the Collector Ring at FAIR	antiproton, kicker, ion, cryogenics	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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MOPF09	Signals from a Beam Performing Betatron Oscillations Using an Electrostatic Electrode Model with Rectangular Boundaries	betatron, storage-ring, vacuum, kicker	51
	F. Nolden GSI, Darmstadt, Germany J.X. Wu IMP/CAS, Lanzhou, People's Republic of China
	We present a novel electrostatic electrode model with rectangular boundaries. The fields are calculated using a conformal mapping. These fields are used to calculate the signal due to a relativistic beam. The response at harmonics of the revolution frequency and at the corresponding horizontal and vertical sidebands is given. The underlying nonlinear formalism is due to Bisognano and Leeman. The electrode geometry of the new stochastic cooling system at the CSRe ring at the IMP in Lanzhou is taken to derive the responses in the sum mode, the horizontal difference mode, and the vertical difference mode.
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TUPF07	Progress of the RF-System Developments for Stochastic Cooling at the FAIR Collector Ring	kicker, insertion, embedded, controls	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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WEWAUD03	Optical Stochastic Cooling at IOTA ring	optics, emittance, kicker, betatron	123
	V.A. Lebedev, A.L. Romanov Fermilab, Batavia, Illinois, USA
	The optical stochastic cooling (OSC) represents a promising novel technology capable to achieve fast cooling rates required to support high luminosity of future hadron colliders. The OSC is based on the same principles as the normal microwave stochastic cooling but uses much smaller wave length resulting in a possibility of cooling of very dense bunches. In this paper we consider basic principles of the OSC operation and main limitations on its practical implementation. Conclusions will be illustrated by Fermilab proposal of the OSC test in the IOTA ring. Work supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
	Slides WEWAUD03 [1.018 MB]
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WEWAUD04	Single-pass-amplifier for Optical Stochastic Cooling Proof-of-Principle Experiment at IOTA	undulator, laser, radiation, kicker	128
	M.B. Andorf, P. Piot Northern Illinois University, DeKalb, Illinois, USA V.A. Lebedev, P. Piot, J. Ruan Fermilab, Batavia, Illinois, USA
	Funding: This work is supported by the US DOE contracts No. DE-SC0013761 with Northern Illinois University and No. DE-AC02-07CH11359 with the Fermi Research Alliance, LLC which operates Fermilab. Test design of a single-pass mid-infrared Cr:ZnSe optical amplifier for an optical stochastic cooling (OSC) proof-ofprinciple experiment foreseen at the Integrable Optics Test Accelerator (IOTA) ring part of Fermilab Accelerator Science & Technology (FAST) facility. We especially present an estimate of the gain and evaluate effects of thermal lensing. A conceptual design of the amplifier and associated optics is provided.
	Slides WEWAUD04 [1.155 MB]
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FRWAUD01	Stochastic Cooling Experiments at Nuclotron and Application to NICA Collider	collider, kicker, experiment, software	165
	N. Shurkhno, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia T. Katayama GSI, Darmstadt, Germany R. Stassen FZJ, Jülich, Germany
	Stochastic cooling is obligatory for the NICA accelerator facility that is presently under development at JINR, Russia. Cooling will work with the high-intensity bunched beams in the 3-4.5 GeV energy range; all three dimensions will be treated simultaneously. The preparatory experimental work on stochastic cooling is carried out at accelerator Nuclotron (JINR) since 2010. During this work hardware solutions and automation techniques for system adjustment have been worked out and tested. Based on the gained experience the overall design of the NICA stochastic cooling system was also developed. The report describes the results of cooling experiments at Nuclotron, the developed adjustment automation techniques and presents the design of the NICA stochastic cooling system.
	Slides FRWAUD01 [2.401 MB]
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FRWAUD02	Fokker-Planck Approach to the Description of Transverse Stochastic Cooling	emittance, kicker, betatron, network	170
	F. Nolden GSI, Darmstadt, Germany
	A Fokker-Planck model of transverse stochastic cooling (without feedback through the beam) is presented, which relies on moderately simplified assumptions about the underlying cooling system. The equilibrium emittance distribution turns out to be always exponential. Furthermore, if the initial distribution is already exponential, then the solution of the fully time-dependent Fokker-Planck equation remains exponential. The average emittance decays with a rate towards equilibrium, which is completely consistent with the classical van der Meer rate, including undesired mixing, desired mixing and thermal noise.
	Slides FRWAUD02 [1.088 MB]
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FRWAUD03	Design of the Palmer Pickup for Stochastic Pre-Cooling of Hot Rare Isotopes at the CR	impedance, simulation, kicker, coupling	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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FRYAUD01	Commissioning of the Rare-RI Ring at RIKEN RI Beam Factory	kicker, injection, dipole, detector	182
	Y. Yamaguchi, Y. Abe RIKEN, Saitama, Japan F. Suzaki, M. Wakasugi RIKEN Nishina Center, Wako, Japan
	The Rare-RI Ring (R3) is an isochronous storage ring to measure masses of short-lived rare nuclei by using a TOF method. The expected precision of the measured mass will be of the order of ppm. A commissioning run using a 78Kr beam was performed in June 2015 and basic performances of R3 were verified. We succeeded in injecting a particle, which was randomly produced from a DC beam from cyclotrons, into the R3 individually* with a fast kicker system**, and in extracting the particle from the R3 1 ms after the injection. We measured TOF of the 78Kr particles between the entrance and the exit of the R3 to check the isochronism. Through the first-order adjustment with trim-coils imbedded on the dipole magnets of the R3, the isochronism on the 10-ppm order was achieved for the momentum spread of ±0.2 %. Higher-order adjustment employed in future will lead us to the isochronism on the order of ppm. In addition, we confirmed that a resonance-type Schottky pick-up successfully acquired the revolution frequency information of one particle in a storage mode. In this conference, the technical aspects of the R3 and prospects from the results of the beam commissioning will be discussed. A. Ozawa, et al., Prog. Theor. Exp. Phys. 2012, 03C009 I. Meshkov, et. al., Proceedings of EPAC 2004, Lucerne, Switzerland. * Y. Yamaguchi, et al., Proceedings of STORI'14, in press
	Slides FRYAUD01 [16.252 MB]
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Paper

Title

Other Keywords

Page

MOYAUD02

Stochastic Cooling of Heavy Ions in the HESR

ion, heavy-ion, impedance, target

15

R. Stassen, B. Breitkreutz, G. Schug, H. Stockhorst
FZJ, Jülich, Germany

Due to the modularized start version (MSV) of the FAIR project with the postponed NESR, the HESR (High Energy Storage Ring) became very attractive for experiments with heavy ions. Although the HESR is optimized for the storage of antiprotons it is also well suited for heavy-ion beams with slightly changes in the optics. Within the MSV only stochastic cooling and no e-cooling will be available, but even the main 2-4 GHz stochastic cooling system will be capable to fulfill the beam requirements for heavy ions. Most critical parts of the active elements are the high power amplifiers. The stochastic cooling amplifiers for the HESR will be based on new GaN devices. Nonlinearities of these devices necessitate a dedicated analysis for use in stochastic cooling systems.

Slides MOYAUD02 [5.720 MB]

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MOYAUD03

Stochastic Cooling System for HESR - Theoretical and Simulation Studies

kicker, ion, antiproton, target

20

H. Stockhorst, B. Lorentz, R. Maier, D. Prasuhn, R. Stassen
FZJ, Jülich, Germany
T. Katayama
Nihon University, Narashino, Chiba, Japan

The High-Energy Storage Ring (HESR) is part of the upcoming International Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt. The HESR dedicates to the field of high-energy antiproton physics to explore the research areas of charmonium spectroscopy, hadronic structure, and quark-gluon dynamics with high-quality beams over a broad momentum range from 1.5 to 15 GeV/c. The facility provides the combination of powerful phase-space cooled antiproton beams and internal Pellet or gas jet targets to achieve the requirements of the experiment PANDA in terms of beam quality and luminosity. Recently, the feasibility of the HESR has been investigated for the application of cooled heavy ion beams with the special emphasis on the experimental program of the SPARC collaboration at FAIR. In this contribution an outline of the Fokker-Planck approach and particle tracking for momentum cooling assisted by a barrier bucket cavity with an internal target is given. A comparison of the filter and filter-less TOF cooling techniques including beam feedback is presented. Simulation and experimental studies at COSY to verify the predictions of the cooling theory complete the contribution.

Slides MOYAUD03 [4.508 MB]

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MOYAUD04

Stochastic Cooling Developments for the Collector Ring at FAIR

antiproton, kicker, ion, cryogenics

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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MOPF09

Signals from a Beam Performing Betatron Oscillations Using an Electrostatic Electrode Model with Rectangular Boundaries

betatron, storage-ring, vacuum, kicker

51

F. Nolden
GSI, Darmstadt, Germany
J.X. Wu
IMP/CAS, Lanzhou, People's Republic of China

We present a novel electrostatic electrode model with rectangular boundaries. The fields are calculated using a conformal mapping. These fields are used to calculate the signal due to a relativistic beam. The response at harmonics of the revolution frequency and at the corresponding horizontal and vertical sidebands is given. The underlying nonlinear formalism is due to Bisognano and Leeman. The electrode geometry of the new stochastic cooling system at the CSRe ring at the IMP in Lanzhou is taken to derive the responses in the sum mode, the horizontal difference mode, and the vertical difference mode.

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TUPF07

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

kicker, insertion, embedded, controls

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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WEWAUD03

Optical Stochastic Cooling at IOTA ring

optics, emittance, kicker, betatron

123

V.A. Lebedev, A.L. Romanov
Fermilab, Batavia, Illinois, USA

The optical stochastic cooling (OSC) represents a promising novel technology capable to achieve fast cooling rates required to support high luminosity of future hadron colliders. The OSC is based on the same principles as the normal microwave stochastic cooling but uses much smaller wave length resulting in a possibility of cooling of very dense bunches. In this paper we consider basic principles of the OSC operation and main limitations on its practical implementation. Conclusions will be illustrated by Fermilab proposal of the OSC test in the IOTA ring.
Work supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.

Slides WEWAUD03 [1.018 MB]

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WEWAUD04

Single-pass-amplifier for Optical Stochastic Cooling Proof-of-Principle Experiment at IOTA

undulator, laser, radiation, kicker

128

M.B. Andorf, P. Piot
Northern Illinois University, DeKalb, Illinois, USA
V.A. Lebedev, P. Piot, J. Ruan
Fermilab, Batavia, Illinois, USA

Funding: This work is supported by the US DOE contracts No. DE-SC0013761 with Northern Illinois University and No. DE-AC02-07CH11359 with the Fermi Research Alliance, LLC which operates Fermilab.
Test design of a single-pass mid-infrared Cr:ZnSe optical amplifier for an optical stochastic cooling (OSC) proof-ofprinciple experiment foreseen at the Integrable Optics Test Accelerator (IOTA) ring part of Fermilab Accelerator Science & Technology (FAST) facility. We especially present an estimate of the gain and evaluate effects of thermal lensing. A conceptual design of the amplifier and associated optics is provided.

Slides WEWAUD04 [1.155 MB]

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FRWAUD01

Stochastic Cooling Experiments at Nuclotron and Application to NICA Collider

collider, kicker, experiment, software

165

N. Shurkhno, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
T. Katayama
GSI, Darmstadt, Germany
R. Stassen
FZJ, Jülich, Germany

Stochastic cooling is obligatory for the NICA accelerator facility that is presently under development at JINR, Russia. Cooling will work with the high-intensity bunched beams in the 3-4.5 GeV energy range; all three dimensions will be treated simultaneously. The preparatory experimental work on stochastic cooling is carried out at accelerator Nuclotron (JINR) since 2010. During this work hardware solutions and automation techniques for system adjustment have been worked out and tested. Based on the gained experience the overall design of the NICA stochastic cooling system was also developed. The report describes the results of cooling experiments at Nuclotron, the developed adjustment automation techniques and presents the design of the NICA stochastic cooling system.

Slides FRWAUD01 [2.401 MB]

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FRWAUD02

Fokker-Planck Approach to the Description of Transverse Stochastic Cooling

emittance, kicker, betatron, network

170

F. Nolden
GSI, Darmstadt, Germany

A Fokker-Planck model of transverse stochastic cooling (without feedback through the beam) is presented, which relies on moderately simplified assumptions about the underlying cooling system. The equilibrium emittance distribution turns out to be always exponential. Furthermore, if the initial distribution is already exponential, then the solution of the fully time-dependent Fokker-Planck equation remains exponential. The average emittance decays with a rate towards equilibrium, which is completely consistent with the classical van der Meer rate, including undesired mixing, desired mixing and thermal noise.

Slides FRWAUD02 [1.088 MB]

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FRWAUD03

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

impedance, simulation, kicker, coupling

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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FRYAUD01

Commissioning of the Rare-RI Ring at RIKEN RI Beam Factory

kicker, injection, dipole, detector

182

Y. Yamaguchi, Y. Abe
RIKEN, Saitama, Japan
F. Suzaki, M. Wakasugi
RIKEN Nishina Center, Wako, Japan

The Rare-RI Ring (R3) is an isochronous storage ring to measure masses of short-lived rare nuclei by using a TOF method*. The expected precision of the measured mass will be of the order of ppm. A commissioning run using a 78Kr beam was performed in June 2015 and basic performances of R3 were verified. We succeeded in injecting a particle, which was randomly produced from a DC beam from cyclotrons, into the R3 individually** with a fast kicker system***, and in extracting the particle from the R3 1 ms after the injection. We measured TOF of the 78Kr particles between the entrance and the exit of the R3 to check the isochronism. Through the first-order adjustment with trim-coils imbedded on the dipole magnets of the R3, the isochronism on the 10-ppm order was achieved for the momentum spread of ±0.2 %. Higher-order adjustment employed in future will lead us to the isochronism on the order of ppm. In addition, we confirmed that a resonance-type Schottky pick-up successfully acquired the revolution frequency information of one particle in a storage mode. In this conference, the technical aspects of the R3 and prospects from the results of the beam commissioning will be discussed.
* A. Ozawa, et al., Prog. Theor. Exp. Phys. 2012, 03C009
** I. Meshkov, et. al., Proceedings of EPAC 2004, Lucerne, Switzerland.
*** Y. Yamaguchi, et al., Proceedings of STORI'14, in press

Slides FRYAUD01 [16.252 MB]

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