DIPAC2011 - List of Keywords (focusing)

Paper	Title	Other Keywords	Page
MOPD12	Expressing Properties of BPM Measurement System in Terms of Error Emittance and Error Twiss Parameters	emittance, betatron, FEL, beam-transport	62
	V. Balandin, W. Decking, N. Golubeva DESY, Hamburg, Germany
	The determination of variations in the beam position and in the beam energy using BPM readings is one of the standard problems of accelerator physics. If the optical model of the beam line and BPM resolutions are known, the typical choice is to let jitter parameters be a solution of the weighted linear least squares problem. For transversely uncoupled motion this least squares problem can be solved analytically, but the direct usage of the obtained solution as a tool for designing a BPM measurement system is not straightforward. A better understanding of the nature of the problem is needed. In this paper we show that properties of the BPM measurement system can be described in terms of the usual accelerator physics concepts of emittance, energy spread, dispersions and betatron functions. In this way one can compare two BPM systems comparing their so-called error emittances and error energy spreads, or, for a given measurement system, one can achieve a balance between coordinate and momentum reconstruction errors by matching the error betatron functions in the point of interest to the desired values.

MOPD42	μ-loss Detector for IFMIF-EVEDA	neutron, linac, solenoid, cryomodule	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.

TUPD87	Fuzzy Logic Controls of a Particle Accelerator	controls, ion, fuzzy set, monitoring	509
	O.F. Toader NERS-UM, Ann Arbor, Michigan, USA
	The ion beams produced in a particle accelerator have to be characterized and monitored using parameters specific to the instruments involved and information from practical (hands-on) operation of those instruments and of the accelerator as a whole. The control is critical considering the multitude of equipment and tasks involved. It is a nonlinear, non-standard process difficult to model. This paper will presents the progress that is currently being made in the attempt to implement fuzzy logic theory in controlling parts of the 1.7 MV Tandem particle accelerator at the Michigan Ion Beam Laboratory.

Paper

Title

Other Keywords

Page

MOPD12

Expressing Properties of BPM Measurement System in Terms of Error Emittance and Error Twiss Parameters

emittance, betatron, FEL, beam-transport

62

V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany

The determination of variations in the beam position and in the beam energy using BPM readings is one of the standard problems of accelerator physics. If the optical model of the beam line and BPM resolutions are known, the typical choice is to let jitter parameters be a solution of the weighted linear least squares problem. For transversely uncoupled motion this least squares problem can be solved analytically, but the direct usage of the obtained solution as a tool for designing a BPM measurement system is not straightforward. A better understanding of the nature of the problem is needed. In this paper we show that properties of the BPM measurement system can be described in terms of the usual accelerator physics concepts of emittance, energy spread, dispersions and betatron functions. In this way one can compare two BPM systems comparing their so-called error emittances and error energy spreads, or, for a given measurement system, one can achieve a balance between coordinate and momentum reconstruction errors by matching the error betatron functions in the point of interest to the desired values.

MOPD42

μ-loss Detector for IFMIF-EVEDA

neutron, linac, solenoid, cryomodule

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.

TUPD87

Fuzzy Logic Controls of a Particle Accelerator

controls, ion, fuzzy set, monitoring

509

O.F. Toader
NERS-UM, Ann Arbor, Michigan, USA

The ion beams produced in a particle accelerator have to be characterized and monitored using parameters specific to the instruments involved and information from practical (hands-on) operation of those instruments and of the accelerator as a whole. The control is critical considering the multitude of equipment and tasks involved. It is a nonlinear, non-standard process difficult to model. This paper will presents the progress that is currently being made in the attempt to implement fuzzy logic theory in controlling parts of the 1.7 MV Tandem particle accelerator at the Michigan Ion Beam Laboratory.