COOL2013 - List of Authors (Weilbach, T.)

Paper

Title

Page

Electron Cooler R&D at Helmholtz-Institut Mainz

65

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

Funding: Helmholtz Gesllschaft deutscher Forschungszentren
The Accelerator group at Helmholtz Institut Mainz supports the construction of the HESR storage ring at FAIR. One of our main goals is to contribute to the development of a magnetized electron cooler for the energy range between 4 and 8 MeV, allowing to cool antiprotons up to maximum momentum available at HESR. Technical challenges include handling the beam current, extreme collector efficiency and non-invasive beam diagnostics. Furthermore, the powering of solenoids in the acceleration channel is still object to R&D. The status of the aforementioned topics is summarized and an outline of the plans for the future is given.

Slides TUAM2HA03 [2.218 MB]

WEPPO03

Operational Experience with the HESR Electron Cooler Test Set-up

100

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

The electron cooler test set-up built at Helmholtz-Institut Mainz as a feasibility study for the electron cooling device at the High Energy Storage Ring (HESR) at FAIR has been set in operation. One of the main goals of the test set-up is to evaluate the gun design proposed by TSL (Uppsala) with respect to vacuum handling, EM fields and the resulting beam parameters. Another purpose of the set-up is to achieve an energy recuperation efficiency of 1 - 10^-5. To measure this quantity, a Wien filter will be employed, which will also prove capable of mitigating collection losses. Recent developments and operational experiences with the test set-up will be presented.

Poster WEPPO03 [4.290 MB]

WEPPO05

Powering of the HV-Solenoids at the HESR Electron Cooler

107

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

The experiments at the planned 'High Energy Storage Ring' (HESR) require magnetised electron cooling. One of the challenges is the powering of the HV-solenoids, which are located on so-called separation boxes inside a high voltage vessel. Because the separation boxes sit on electrical potential, a floating power supply for the HV-solenoids is needed. A currently discussed concept is the use of turbo generators. The turbo generators, an assembly of a turbine and an electrical generator, will also be used as floating supply for a cascade generator generating the potential difference between the individual separation boxes. The turbine is powered by gas, e.g. dry air or -preferantially - sulphur hexafluoride, under high pressure, consequently driving the generator which delivers an electrical power of 5 kW. The high pressure gas could be generated outside the high voltage vessel and guided to the turbine afterwards. The presentation gives an overview of the turbo generator project: an introduction, a status report and a road map will be given.

Poster WEPPO05 [3.402 MB]

WEPPO10

Beam Profile Measurements for Magnetized High Energy Cooling Devices

116

T. Weilbach, K. Aulenbacher, M.W. Bruker
HIM, Mainz, Germany

Recent developments in the field of magnetized high energy electron coolers, have led to special demands on the beam diagnostics. Since commonly used diagnostic tools such as the recombination rate of electrons and protons to H⁰ are not useful for the antiproton beam of the HESR at FAIR new methods are needed. Hence for beam profile measurements a system based on beam induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components. Both methods are implemented in the beamline of a a 100 keV photo gun. Beam profile measurements with BIF as well as first results of the TLS will be presented.

Poster WEPPO10 [1.712 MB]

Paper	Title	Page
TUAM2HA03	Electron Cooler R&D at Helmholtz-Institut Mainz	65
	K. Aulenbacher, M.W. Bruker, J. Dietrich, S. Friederich, A. Hofmann, T. Weilbach HIM, Mainz, Germany
	Funding: Helmholtz Gesllschaft deutscher Forschungszentren The Accelerator group at Helmholtz Institut Mainz supports the construction of the HESR storage ring at FAIR. One of our main goals is to contribute to the development of a magnetized electron cooler for the energy range between 4 and 8 MeV, allowing to cool antiprotons up to maximum momentum available at HESR. Technical challenges include handling the beam current, extreme collector efficiency and non-invasive beam diagnostics. Furthermore, the powering of solenoids in the acceleration channel is still object to R&D. The status of the aforementioned topics is summarized and an outline of the plans for the future is given.
	Slides TUAM2HA03 [2.218 MB]

WEPPO03	Operational Experience with the HESR Electron Cooler Test Set-up	100
	M.W. Bruker, K. Aulenbacher, J. Dietrich, S. Friederich, A. Hofmann, T. Weilbach HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany
	The electron cooler test set-up built at Helmholtz-Institut Mainz as a feasibility study for the electron cooling device at the High Energy Storage Ring (HESR) at FAIR has been set in operation. One of the main goals of the test set-up is to evaluate the gun design proposed by TSL (Uppsala) with respect to vacuum handling, EM fields and the resulting beam parameters. Another purpose of the set-up is to achieve an energy recuperation efficiency of 1 - 10^-5. To measure this quantity, a Wien filter will be employed, which will also prove capable of mitigating collection losses. Recent developments and operational experiences with the test set-up will be presented.
	Poster WEPPO03 [4.290 MB]

WEPPO05	Powering of the HV-Solenoids at the HESR Electron Cooler	107
	A. Hofmann, K. Aulenbacher, M.W. Bruker, J. Dietrich, S. Friederich, T. Weilbach HIM, Mainz, Germany
	The experiments at the planned 'High Energy Storage Ring' (HESR) require magnetised electron cooling. One of the challenges is the powering of the HV-solenoids, which are located on so-called separation boxes inside a high voltage vessel. Because the separation boxes sit on electrical potential, a floating power supply for the HV-solenoids is needed. A currently discussed concept is the use of turbo generators. The turbo generators, an assembly of a turbine and an electrical generator, will also be used as floating supply for a cascade generator generating the potential difference between the individual separation boxes. The turbine is powered by gas, e.g. dry air or -preferantially - sulphur hexafluoride, under high pressure, consequently driving the generator which delivers an electrical power of 5 kW. The high pressure gas could be generated outside the high voltage vessel and guided to the turbine afterwards. The presentation gives an overview of the turbo generator project: an introduction, a status report and a road map will be given.
	Poster WEPPO05 [3.402 MB]

WEPPO10	Beam Profile Measurements for Magnetized High Energy Cooling Devices	116
	T. Weilbach, K. Aulenbacher, M.W. Bruker HIM, Mainz, Germany
	Recent developments in the field of magnetized high energy electron coolers, have led to special demands on the beam diagnostics. Since commonly used diagnostic tools such as the recombination rate of electrons and protons to H⁰ are not useful for the antiproton beam of the HESR at FAIR new methods are needed. Hence for beam profile measurements a system based on beam induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components. Both methods are implemented in the beamline of a a 100 keV photo gun. Beam profile measurements with BIF as well as first results of the TLS will be presented.
	Poster WEPPO10 [1.712 MB]