COOL2013 - Table of Session: THAM2HA (Beam Dynamics & New Ideas)

Paper

Title

Page

Beam Accumulation and Bunching with Cooling

170

T. Katayama, M. Steck
GSI, Darmstadt, Germany
T. Kikuchi
Nagaoka University of Technology, Nagaoka, Niigata, Japan
I.N. Meshkov
JINR, Dubna, Moscow Region, Russia
H. Stockhorst
FZJ, Jülich, Germany

The accumulation of anti-proton beam in the storage ring was performed at CERN and FNAL with use of a stochastic stacking system. In the original version of the FAIR such a concept was envisaged at the accumulator ring named RESR. However in the modularized start version of FAIR, the RESR was postponed and the new concept of anti-proton accumulation in the High Energy Storage Ring (HESR) was strongly demanded. The barrier bucket system with stochastic cooling was found with simulation work to have enough capabilities to accumulate the pre-cooled 3 GeV anti-proton beam in the HESR. The Proof Of Principle (POP) experiment was performed at the GSI storage ring ESR with the use of Ar and Xe ion beam employing both stochastic and electron cooling. The experimental results were well in agreement with the prediction of the simulation study. The concept of BB accumulation could be applied to the planned Collider of the NICA project at JINR. In the present paper the concept of BB accumulation and the short bunch formation including the space charge effects are presented as well as the analysis of POP experiment.

Slides THAM2HA01 [8.446 MB]

THAM2HA02

Advances in Coherent Electron Cooling

175

V. Litvinenko
BNL, Upton, Long Island, New York, USA

This talk will be focused on advances and challenges in cooling of high-energy hadron – and potentially heavy lepton-beams. Such techniques are required to improve quality of hadron beams and for increasing the luminosity in hadron and electron-hadron colliders. The focus of the talk will be on the Coherent Electron Cooling technique, which combines aspects of both stochastic and electron cooling. Coherent Electron Cooling shares with the first the need for a broad bandwidth and with the second an electrostatic-form of interaction between the hadrons and the electrons. I will discuss the physics principles of the Coherent Electron Cooling and progress made in its theory in last five years. I will also discuss its advantages and limitations.

THAM2HA03

Noise Suppression in Relativistic Electron Beams

184

G.V. Stupakov
SLAC, Menlo Park, California, USA
A. Sessler, M.S. Zolotorev
LBNL, Berkeley, California, USA

Funding: Work supported by the U.S. Department of Energy under contracts No. DE-AC02-76SF00515 and DE-AC02-05CH11231.
Understanding and controlling the noise effects in relativistic beams is becoming increasingly important with new applications for ultra-bright particle sources such as x-ray free electron lasers (FELs). In free electron lasers, shot noise provides the startup radiation for Self-Amplified Spontaneous Emission (SASE), but also drives hazardous instabilities that might impede coherent processes. Several approaches to the noise suppression at sub-micron wavelengths have been studied in recent years both theoretically and experimentally. In this paper we review the proposed approaches to noise suppression and compare their suppressing capabilities at short wavelengths. We then develop a general approach for study of noise suppressors that use an interaction region in combination with a dispersion section. We apply this method for the case when undulators are used in the interaction region, and show its promise for short-wavelengths FEL.

Slides THAM2HA03 [2.539 MB]

Paper	Title	Page
THAM2HA01	Beam Accumulation and Bunching with Cooling	170
	T. Katayama, M. Steck GSI, Darmstadt, Germany T. Kikuchi Nagaoka University of Technology, Nagaoka, Niigata, Japan I.N. Meshkov JINR, Dubna, Moscow Region, Russia H. Stockhorst FZJ, Jülich, Germany
	The accumulation of anti-proton beam in the storage ring was performed at CERN and FNAL with use of a stochastic stacking system. In the original version of the FAIR such a concept was envisaged at the accumulator ring named RESR. However in the modularized start version of FAIR, the RESR was postponed and the new concept of anti-proton accumulation in the High Energy Storage Ring (HESR) was strongly demanded. The barrier bucket system with stochastic cooling was found with simulation work to have enough capabilities to accumulate the pre-cooled 3 GeV anti-proton beam in the HESR. The Proof Of Principle (POP) experiment was performed at the GSI storage ring ESR with the use of Ar and Xe ion beam employing both stochastic and electron cooling. The experimental results were well in agreement with the prediction of the simulation study. The concept of BB accumulation could be applied to the planned Collider of the NICA project at JINR. In the present paper the concept of BB accumulation and the short bunch formation including the space charge effects are presented as well as the analysis of POP experiment.
	Slides THAM2HA01 [8.446 MB]

THAM2HA02	Advances in Coherent Electron Cooling	175
	V. Litvinenko BNL, Upton, Long Island, New York, USA
	This talk will be focused on advances and challenges in cooling of high-energy hadron – and potentially heavy lepton-beams. Such techniques are required to improve quality of hadron beams and for increasing the luminosity in hadron and electron-hadron colliders. The focus of the talk will be on the Coherent Electron Cooling technique, which combines aspects of both stochastic and electron cooling. Coherent Electron Cooling shares with the first the need for a broad bandwidth and with the second an electrostatic-form of interaction between the hadrons and the electrons. I will discuss the physics principles of the Coherent Electron Cooling and progress made in its theory in last five years. I will also discuss its advantages and limitations.

THAM2HA03	Noise Suppression in Relativistic Electron Beams	184
	G.V. Stupakov SLAC, Menlo Park, California, USA A. Sessler, M.S. Zolotorev LBNL, Berkeley, California, USA
	Funding: Work supported by the U.S. Department of Energy under contracts No. DE-AC02-76SF00515 and DE-AC02-05CH11231. Understanding and controlling the noise effects in relativistic beams is becoming increasingly important with new applications for ultra-bright particle sources such as x-ray free electron lasers (FELs). In free electron lasers, shot noise provides the startup radiation for Self-Amplified Spontaneous Emission (SASE), but also drives hazardous instabilities that might impede coherent processes. Several approaches to the noise suppression at sub-micron wavelengths have been studied in recent years both theoretically and experimentally. In this paper we review the proposed approaches to noise suppression and compare their suppressing capabilities at short wavelengths. We then develop a general approach for study of noise suppressors that use an interaction region in combination with a dispersion section. We apply this method for the case when undulators are used in the interaction region, and show its promise for short-wavelengths FEL.
	Slides THAM2HA03 [2.539 MB]