COOL2015 - List of Authors (Aulenbacher, K.)

Paper

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The Green Energy Turbine as Turbo Generator for Powering the HV-Solenoids at a Relativistic Electron Cooler

29

A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach
HIM, Mainz, Germany
V.V. Parkhomchuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia

One challenge in the development of a relativistic electron cooler is the powering of components, e.g. HV-solenoids, which sit on different potentials within a high voltage vessel and need a floating power supply. Within a design study, BINP SB RAS Novosibirsk has proposed two possibilities to build a power supply in a modular way. The first proposal is to use two cascade transformers per module. One cascade transformer powers 22 small HV-solenoids; the second one should generate the acceleration/deceleration voltage. The cascade transformers are fed by a turbo generator, which is powered by a gas under high pressure which is generated outside of the vessel. The second possibility is to use two big HV-solenoids per module. In this proposal, the HV-solenoids are powered directly by a turbo generator. For both concepts, a suitable turbo generator is essential. A potential candidate for the turbo generator could be the Green Energy Turbine (GET) from the company DEPRAG, which works with dry air and delivers a power of 5 kW. At the Helmholtz-Institut Mainz two GETS are tested. After an introduction, we present our experience with the GET and give an overview of the further road map.

Poster MOPF02 [3.424 MB]

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MOPF08

Secondary Electron Measurements at the HIM Electron Cooler Test Set-Up

48

M.W. Bruker, K. Aulenbacher, J. Dietrich, A. Hofmann, T. Weilbach
HIM, Mainz, Germany

The planned advances in electron cooling technology aimed at improving the operation of future hadron storage rings include an increase in electron beam current and acceleration voltage. A test set-up has been built at Helmholtz-Insitut Mainz (HIM) to optimize the recuperation efficiency of such high-current beams in energy recovery operation, requiring a thorough understanding of their interaction with external electric and magnetic fields, such as those found in a Wien velocity filter. Beam diagnostics are carried out using a BPM and current-sensing scraper electrodes. At present, the set-up can be successfully operated at U=17 kV, I=600 mA, showing a relative secondary electron current of about 2·10^-4. We present the current state of the project and its objectives for the foreseeable future.

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THWCR01

Exploring New Techniques for Operation and Diagnostics of Relativistic Electron Coolers

K. Aulenbacher
HIM, Mainz, Germany

The Helmholtzinstitut Mainz (HIM) performs test experiments related to a possible improvement of high energy electron coolers. Results and activities concerning non-invasive beam diagnostics and beam control under large operational currents will be presented. Further, progress of our project to use turbogenerators as a means for potential free power generation in high energy electron coolers is presented.

Slides THWCR01 [16.529 MB]

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THWCR02

The SNS Laser Stripping Injection Experiment and its Implications on Beam Accumulation

140

S.M. Cousineau, T.V. Gorlov, Y. Liu, A.A. Menshov, M.A. Plum, A. Rakhman
ORNL, Oak Ridge, Tennessee, USA
K. Aulenbacher
IKP, Mainz, Germany

The laser assisted H⁻ charge exchange concept is under development at the Spallation Neutron Source (SNS) as on option for replacing traditional carbon-based foil technology in future accelerators. A laser based stripping system has the potential to alleviate limiting issues with foil technology, paving the way for accumulation of much higher density proton beams. This paper discusses the advantages and limitations of a laser-based stripping system compared with traditional foil-based charge exchange systems for various beam accumulation scenarios, scaling from SNS experience with high power beam injection and calculations of laser stripping parameters. In addition, preparations for an experimental demonstration of laser assisted stripping for microsecond long 1 GeV, H⁻ beams are described.

Slides THWCR02 [34.408 MB]

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Paper	Title	Page
MOPF02	The Green Energy Turbine as Turbo Generator for Powering the HV-Solenoids at a Relativistic Electron Cooler	29
	A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, T. Weilbach HIM, Mainz, Germany V.V. Parkhomchuk, V.B. Reva BINP SB RAS, Novosibirsk, Russia
	One challenge in the development of a relativistic electron cooler is the powering of components, e.g. HV-solenoids, which sit on different potentials within a high voltage vessel and need a floating power supply. Within a design study, BINP SB RAS Novosibirsk has proposed two possibilities to build a power supply in a modular way. The first proposal is to use two cascade transformers per module. One cascade transformer powers 22 small HV-solenoids; the second one should generate the acceleration/deceleration voltage. The cascade transformers are fed by a turbo generator, which is powered by a gas under high pressure which is generated outside of the vessel. The second possibility is to use two big HV-solenoids per module. In this proposal, the HV-solenoids are powered directly by a turbo generator. For both concepts, a suitable turbo generator is essential. A potential candidate for the turbo generator could be the Green Energy Turbine (GET) from the company DEPRAG, which works with dry air and delivers a power of 5 kW. At the Helmholtz-Institut Mainz two GETS are tested. After an introduction, we present our experience with the GET and give an overview of the further road map.
	Poster MOPF02 [3.424 MB]
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MOPF08	Secondary Electron Measurements at the HIM Electron Cooler Test Set-Up	48
	M.W. Bruker, K. Aulenbacher, J. Dietrich, A. Hofmann, T. Weilbach HIM, Mainz, Germany
	The planned advances in electron cooling technology aimed at improving the operation of future hadron storage rings include an increase in electron beam current and acceleration voltage. A test set-up has been built at Helmholtz-Insitut Mainz (HIM) to optimize the recuperation efficiency of such high-current beams in energy recovery operation, requiring a thorough understanding of their interaction with external electric and magnetic fields, such as those found in a Wien velocity filter. Beam diagnostics are carried out using a BPM and current-sensing scraper electrodes. At present, the set-up can be successfully operated at U=17 kV, I=600 mA, showing a relative secondary electron current of about 2·10^-4. We present the current state of the project and its objectives for the foreseeable future.
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THWCR01	Exploring New Techniques for Operation and Diagnostics of Relativistic Electron Coolers
	K. Aulenbacher HIM, Mainz, Germany
	The Helmholtzinstitut Mainz (HIM) performs test experiments related to a possible improvement of high energy electron coolers. Results and activities concerning non-invasive beam diagnostics and beam control under large operational currents will be presented. Further, progress of our project to use turbogenerators as a means for potential free power generation in high energy electron coolers is presented.
	Slides THWCR01 [16.529 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THWCR02	The SNS Laser Stripping Injection Experiment and its Implications on Beam Accumulation	140
	S.M. Cousineau, T.V. Gorlov, Y. Liu, A.A. Menshov, M.A. Plum, A. Rakhman ORNL, Oak Ridge, Tennessee, USA K. Aulenbacher IKP, Mainz, Germany
	The laser assisted H⁻ charge exchange concept is under development at the Spallation Neutron Source (SNS) as on option for replacing traditional carbon-based foil technology in future accelerators. A laser based stripping system has the potential to alleviate limiting issues with foil technology, paving the way for accumulation of much higher density proton beams. This paper discusses the advantages and limitations of a laser-based stripping system compared with traditional foil-based charge exchange systems for various beam accumulation scenarios, scaling from SNS experience with high power beam injection and calculations of laser stripping parameters. In addition, preparations for an experimental demonstration of laser assisted stripping for microsecond long 1 GeV, H⁻ beams are described.
	Slides THWCR02 [34.408 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)