DIPAC2011 - List of Keywords (solenoid)

Paper	Title	Other Keywords	Page
MOPD04	RHIC Electron Lens Test Bench Diagnostics	electron, ion, diagnostics, gun	38
	D.M. Gassner, E.N. Beebe, W. Fischer, X. Gu, K. Hamdi, J. Hock, C. Liu, T.A. Miller, A.I. Pikin, P. Thieberger BNL, Upton, Long Island, New York, USA
	An Electron Lens system will be installed in RHIC to increase luminosity by counteracting the head-on beam-beam interaction. The proton beam collisions at the two experimental locations will introduce a tune spread due to a difference of tune shifts between small and large amplitude particles. A low energy electron beam will be used to improve luminosity and lifetime of the colliding beams by reducing the betatron tune shift and spread. In preparation for the Electron Lens installation next year, a test bench facility will be used to gain experience with all sub-systems. This paper will discuss the diagnostics related to measuring the electron beam parameters.

MOPD42	μ-loss Detector for IFMIF-EVEDA	neutron, linac, cryomodule, focusing	146
	J. Marroncle, P. Abbon, J. Egberts CEA/DSM/IRFU, France M. Pomorski CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
	For the IFMIF-EVEDA project, a prototype accelerator is being built in Europe and installed at Rokkasho (Japan). It is designed to accelerate 125 mA CW Deuteron to 9 MeV. The very high space charge and high power (1.125 MW) of the beam make this accelerator very challenging. For hands-on maintenance requirements, losses must be well less than 1W/m, i.e. 10^-6 of the beam. That is why, in the 5-9 MeV superconducting Linac, beam dynamics physicists search to tune the beam by minimizing the very external part of the halo. The need is thus to be able to measure very tiny beam losses, called μ-losses, at all the focusing magnets. Only neutrons and γ exit from the beam pipe due to the low deuteron beam energy. Thus such beam loss detectors have to be sensitive to neutrons, but rather insensitive for X-rays and γ to decrease their contributions coming from super-conducting cavity emission. They must be radiation hardness qualified, and capable to work at cryogenic temperature. Single CVD diamonds (4×4×0.5 mm³) are studied for these purposes and first results seem to fulfill the requirements up to now.

MOPD52	First Results from Beam Measurements at the 3 MeV Test Stand for CERN Linac4	emittance, linac, rfq, proton	167
	B. Cheymol, J.-B. Lallement, A.E. Lokhovitskiy, O. Midttun, U. Raich, F. Roncarolo, R. Scrivens, E. Zorin CERN, Geneva, Switzerland B. Cheymol Université Blaise Pascal, Clermont-Ferrand, France
	The H⁻ source and the low energy beam line will determine to a large extend the performance of Linac-4, the new machine foreseen as injector into the PS Booster. For this reason a test stand will be set up consisting of the source, Low Energy Beam Transport (LEBT), RFQ and chopper line. Up to now only the source and LEBT are installed. First measurements have been performed using a Faraday Cup to measure the total source intensity, a slit-&-grid emittance meter for transverse emittance measurements and a spectrometer for energy spread measurements. This paper discusses the results from measurements on H⁻ beams at 35kV extraction voltage as well as protons at 45 kV, showing the emittance dependence on source RF power as well as the influence of a solenoid in splitting the beam into its various constituents: protons, H0, H²⁺ and H³⁺. Energy spread measurements are also presented.

WEOC03	Dark Current Monitor for the European XFEL	simulation, controls, impedance, FEL	572
	D. Lipka, W. Kleen, J. Lund-Nielsen, D. Nölle, S. Vilcins, V. Vogel DESY, Hamburg, Germany
	Dark current is produced due from field emission in the accelerator. This generates a radiation background in the tunnel which damages the electronics and activates components. To decrease the dark current different methods like kickers and collimators are used. To control the dark current level and measure and optimize the efficiency of dark current reduction dark current monitors are required. To measure the dark current a cavity was designed and built with the operation frequency of the accelerator. Here the small charge of the dark current present in every RF bucket induces and superimposes a field up to a measurable level. The cavity is proven at the PITZ facility. In addition to dark current levels down to 50 nA, the monitor allows for charge measurements resolution below pC, better than the Faraday cup. In addition the ratio of amplitudes from higher order monopole modes is a function of the bunch length. Measurements show the same trend of bunch length compared with a destructive streak camera method with comparable resolution. Therefore this monitor is able to measure bunch charge, dark current and bunch length in a non-destructive manner.
	Slides WEOC03 [0.935 MB]

Paper

Title

Other Keywords

Page

MOPD04

RHIC Electron Lens Test Bench Diagnostics

electron, ion, diagnostics, gun

38

D.M. Gassner, E.N. Beebe, W. Fischer, X. Gu, K. Hamdi, J. Hock, C. Liu, T.A. Miller, A.I. Pikin, P. Thieberger
BNL, Upton, Long Island, New York, USA

An Electron Lens system will be installed in RHIC to increase luminosity by counteracting the head-on beam-beam interaction. The proton beam collisions at the two experimental locations will introduce a tune spread due to a difference of tune shifts between small and large amplitude particles. A low energy electron beam will be used to improve luminosity and lifetime of the colliding beams by reducing the betatron tune shift and spread. In preparation for the Electron Lens installation next year, a test bench facility will be used to gain experience with all sub-systems. This paper will discuss the diagnostics related to measuring the electron beam parameters.

MOPD42

μ-loss Detector for IFMIF-EVEDA

neutron, linac, cryomodule, focusing

146

J. Marroncle, P. Abbon, J. Egberts
CEA/DSM/IRFU, France
M. Pomorski
CEA/DRT/LIST, Gif-sur-Yvette Cedex, France

For the IFMIF-EVEDA project, a prototype accelerator is being built in Europe and installed at Rokkasho (Japan). It is designed to accelerate 125 mA CW Deuteron to 9 MeV. The very high space charge and high power (1.125 MW) of the beam make this accelerator very challenging. For hands-on maintenance requirements, losses must be well less than 1W/m, i.e. 10^-6 of the beam. That is why, in the 5-9 MeV superconducting Linac, beam dynamics physicists search to tune the beam by minimizing the very external part of the halo. The need is thus to be able to measure very tiny beam losses, called μ-losses, at all the focusing magnets. Only neutrons and γ exit from the beam pipe due to the low deuteron beam energy. Thus such beam loss detectors have to be sensitive to neutrons, but rather insensitive for X-rays and γ to decrease their contributions coming from super-conducting cavity emission. They must be radiation hardness qualified, and capable to work at cryogenic temperature. Single CVD diamonds (4×4×0.5 mm³) are studied for these purposes and first results seem to fulfill the requirements up to now.

MOPD52

First Results from Beam Measurements at the 3 MeV Test Stand for CERN Linac4

emittance, linac, rfq, proton

167

B. Cheymol, J.-B. Lallement, A.E. Lokhovitskiy, O. Midttun, U. Raich, F. Roncarolo, R. Scrivens, E. Zorin
CERN, Geneva, Switzerland
B. Cheymol
Université Blaise Pascal, Clermont-Ferrand, France

The H⁻ source and the low energy beam line will determine to a large extend the performance of Linac-4, the new machine foreseen as injector into the PS Booster. For this reason a test stand will be set up consisting of the source, Low Energy Beam Transport (LEBT), RFQ and chopper line. Up to now only the source and LEBT are installed. First measurements have been performed using a Faraday Cup to measure the total source intensity, a slit-&-grid emittance meter for transverse emittance measurements and a spectrometer for energy spread measurements. This paper discusses the results from measurements on H⁻ beams at 35kV extraction voltage as well as protons at 45 kV, showing the emittance dependence on source RF power as well as the influence of a solenoid in splitting the beam into its various constituents: protons, H0, H²⁺ and H³⁺. Energy spread measurements are also presented.

WEOC03

Dark Current Monitor for the European XFEL

simulation, controls, impedance, FEL

572

D. Lipka, W. Kleen, J. Lund-Nielsen, D. Nölle, S. Vilcins, V. Vogel
DESY, Hamburg, Germany

Dark current is produced due from field emission in the accelerator. This generates a radiation background in the tunnel which damages the electronics and activates components. To decrease the dark current different methods like kickers and collimators are used. To control the dark current level and measure and optimize the efficiency of dark current reduction dark current monitors are required. To measure the dark current a cavity was designed and built with the operation frequency of the accelerator. Here the small charge of the dark current present in every RF bucket induces and superimposes a field up to a measurable level. The cavity is proven at the PITZ facility. In addition to dark current levels down to 50 nA, the monitor allows for charge measurements resolution below pC, better than the Faraday cup. In addition the ratio of amplitudes from higher order monopole modes is a function of the bunch length. Measurements show the same trend of bunch length compared with a destructive streak camera method with comparable resolution. Therefore this monitor is able to measure bunch charge, dark current and bunch length in a non-destructive manner.

Slides WEOC03 [0.935 MB]