HB2016 - List of Keywords (beam-losses)

Paper	Title	Other Keywords	Page
MOPL015	Effect of Beam Losses on Wire Scanner Scintillator Readout, Hypothesis and Preliminary Results	detector, simulation, linac, quadrupole	216
	B. Cheymol ESS, Lund, Sweden
	In hadron accelerators, the characterization of the beam transverse halo can lead to a better understanding of the beam dynamics and ultimately to a reduction of the beam losses. Unfortunately the effect of losses on beam instrumentation implies a reduction of the instrument sensitivity due to the background noise. In this paper, we will discuss the effect of losses on the wire scanner scintillator foreseen for the ESS linac, in particular the different hypothesis for the input will be described and preliminary results will be presented.
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THAM3Y01	R&D on Micro-Loss Monitors for High Intensity Linacs like LIPAc	linac, neutron, SRF, cavity	538
	J. Marroncle, P. Abbon, A. Marchix CEA/IRFU, Gif-sur-Yvette, France M. Pomorski CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
	Before approaching the micro-loss monitor concept, we propose to present the high intensity Linac for which the R&D program was done, LIPAc (Linear IFIMIF Prototype Accelerator). This later is the feasibility accelerator demonstrator for the International Fusion Materials Irradiation Facility (IFMIF). IFMIF aims at providing a very intense neutron source (10¹⁸ neutron/m2/s) to test materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). LIPAc (1.125 MW deuteron beam) is in installation progress at Rokkasho (Japan). Then, we will focus on the feasibility study of the beam optimization inside the SRF Linac part. Commissioning of such high beam intensity has to be done with a different approach based on detection of micro-losses, CVD diamonds, set inside the cryomodule linac.
	Slides THAM3Y01 [2.261 MB]
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THAM4Y01	New Arrangement of Collimators of J-PARC Main Ring	collimation, proton, radiation, operation	543
	M.J. Shirakata, S. Igarashi, K. Ishii, Y. Sato, J. Takano KEK, Ibaraki, Japan
	The beam collimation system of J-PARC main ring has been prepared in order to localize the beam loss into the specified area, especially during the injection period. At the first time, it was constructed as a scraper-catcher system in horizontal and vertical planes which consisted of one halo-scraper and two scattered protons catchers, whose the maximum beam loss capacity was designed to be 450W in the beam injection straight of the ring. In 2012, the scraper was replaced by two collimators with a movable L-type jaw for both planes. Two catchers remained at the same places, and they were used as collimators. This large change of design concept of main ring collimation system was required in order to increase the beam loss capacity more than 3kW. The system worked well but unexpected loss spots still remained in the following arc and straight sections. The four-axis collimator was developed with movable jaw in horizontal, vertical and skew configurations which has high cleaning efficiency. We have four four-axis collimators, two non-skew collimators, and one original catcher. The most effective arrangement of collimators was investigated in this report.
	Slides THAM4Y01 [2.426 MB]
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Paper

Title

Other Keywords

Page

MOPL015

Effect of Beam Losses on Wire Scanner Scintillator Readout, Hypothesis and Preliminary Results

detector, simulation, linac, quadrupole

216

B. Cheymol
ESS, Lund, Sweden

In hadron accelerators, the characterization of the beam transverse halo can lead to a better understanding of the beam dynamics and ultimately to a reduction of the beam losses. Unfortunately the effect of losses on beam instrumentation implies a reduction of the instrument sensitivity due to the background noise. In this paper, we will discuss the effect of losses on the wire scanner scintillator foreseen for the ESS linac, in particular the different hypothesis for the input will be described and preliminary results will be presented.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THAM3Y01

R&D on Micro-Loss Monitors for High Intensity Linacs like LIPAc

linac, neutron, SRF, cavity

538

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

Before approaching the micro-loss monitor concept, we propose to present the high intensity Linac for which the R&D program was done, LIPAc (Linear IFIMIF Prototype Accelerator). This later is the feasibility accelerator demonstrator for the International Fusion Materials Irradiation Facility (IFMIF). IFMIF aims at providing a very intense neutron source (10¹⁸ neutron/m2/s) to test materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). LIPAc (1.125 MW deuteron beam) is in installation progress at Rokkasho (Japan). Then, we will focus on the feasibility study of the beam optimization inside the SRF Linac part. Commissioning of such high beam intensity has to be done with a different approach based on detection of micro-losses, CVD diamonds, set inside the cryomodule linac.

Slides THAM3Y01 [2.261 MB]

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THAM4Y01

New Arrangement of Collimators of J-PARC Main Ring

collimation, proton, radiation, operation

543

M.J. Shirakata, S. Igarashi, K. Ishii, Y. Sato, J. Takano
KEK, Ibaraki, Japan

The beam collimation system of J-PARC main ring has been prepared in order to localize the beam loss into the specified area, especially during the injection period. At the first time, it was constructed as a scraper-catcher system in horizontal and vertical planes which consisted of one halo-scraper and two scattered protons catchers, whose the maximum beam loss capacity was designed to be 450W in the beam injection straight of the ring. In 2012, the scraper was replaced by two collimators with a movable L-type jaw for both planes. Two catchers remained at the same places, and they were used as collimators. This large change of design concept of main ring collimation system was required in order to increase the beam loss capacity more than 3kW. The system worked well but unexpected loss spots still remained in the following arc and straight sections. The four-axis collimator was developed with movable jaw in horizontal, vertical and skew configurations which has high cleaning efficiency. We have four four-axis collimators, two non-skew collimators, and one original catcher. The most effective arrangement of collimators was investigated in this report.

Slides THAM4Y01 [2.426 MB]

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)