HB2016 - Table of Session: THE3 (Working Group E

Paper	Title	Page
THAM1Y01	Beam Commissioning of C-ADS Linac Instrumentation	529
	Y.F. Sui, J.S. Cao, J. He, H.Z. Ma, L. Wang, S.J. Wei, Q. Ye, L. Yu, J.H. Yue, X.Y. Zhao, Y. Zhao IHEP, People's Republic of China
	Funding: Work supported by China ADS Project (XDA03020000) and the National Natural Science Foundation of China (NO. 11205172, NO. 11475204). The China Accelerator Driven Subcritical system (C-ADS) linac, which is composed of an ECR ion source, a low energy beam transport line (LEBT), a radio frequency quadrupole accelerator (RFQ), a medium energy beam transport line (MEBT) and cryomodules with SRF cavities to boost the energy up to 10 MeV. The injector linac will be equipped with beam diagnostics to measure the beam position, the transverse profile and emittance, the beam phase as well as beam current and beam losses. Though many are conventional design, They can provide efficient operation of drive linac. This paper gives an overview and detail in beam commissioning of C-ADS linac beam instrumentation.
	Slides THAM1Y01 [7.594 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM1Y01
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THAM2Y01	Measurements of Beam Pulse Induced Mechanical Strain Inside the SNS* Target Module	532
	W. Blokland, Y. Liu, B.W. Riemer, M. Wendel, D.E. Winder ORNL, Oak Ridge, Tennessee, USA M.J. Dayton ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: * ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. Because several of the SNS targets have had a shorter lifetime than desired, a new target has been instrumented with strain sensors to further our understanding of the proton beam’s mechanical impact. The high radiation and electrically noisy environment led us to pick multi-mode fiber optical strain sensors over other types of strain sensors. Special care was taken to minimize the impact of the sensors on the target’s lifetime. We also placed accelerometers outside the target to try correlating the outside measurements with the internal measurements. Remote manipulators performed the final part of the installation, as even residual radiation is too high for humans to come close to the target’s final location. The initial set of optical sensors on the first instrumented target lasted just long enough to give us measurements from different proton beam intensities. A second set of more rad-hard sensors, installed in the following target, lasted much longer, to give us considerably more data. We are developing our own rad-hard, single-mode fiber optic sensors. This paper describes the design, installation, data-acquisition system, the results of the strain sensors, and future plans.
	Slides THAM2Y01 [13.157 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM2Y01
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THAM3Y01	R&D on Micro-Loss Monitors for High Intensity Linacs like LIPAc	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]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM3Y01
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THAM4Y01	New Arrangement of Collimators of J-PARC Main Ring	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]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM4Y01
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Beam Commissioning of C-ADS Linac Instrumentation

529

Y.F. Sui, J.S. Cao, J. He, H.Z. Ma, L. Wang, S.J. Wei, Q. Ye, L. Yu, J.H. Yue, X.Y. Zhao, Y. Zhao
IHEP, People's Republic of China

Funding: Work supported by China ADS Project (XDA03020000) and the National Natural Science Foundation of China (NO. 11205172, NO. 11475204).
The China Accelerator Driven Subcritical system (C-ADS) linac, which is composed of an ECR ion source, a low energy beam transport line (LEBT), a radio frequency quadrupole accelerator (RFQ), a medium energy beam transport line (MEBT) and cryomodules with SRF cavities to boost the energy up to 10 MeV. The injector linac will be equipped with beam diagnostics to measure the beam position, the transverse profile and emittance, the beam phase as well as beam current and beam losses. Though many are conventional design, They can provide efficient operation of drive linac. This paper gives an overview and detail in beam commissioning of C-ADS linac beam instrumentation.

Slides THAM1Y01 [7.594 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM1Y01

Export •

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

THAM2Y01

Measurements of Beam Pulse Induced Mechanical Strain Inside the SNS* Target Module

532

W. Blokland, Y. Liu, B.W. Riemer, M. Wendel, D.E. Winder
ORNL, Oak Ridge, Tennessee, USA
M.J. Dayton
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: * ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
Because several of the SNS targets have had a shorter lifetime than desired, a new target has been instrumented with strain sensors to further our understanding of the proton beam’s mechanical impact. The high radiation and electrically noisy environment led us to pick multi-mode fiber optical strain sensors over other types of strain sensors. Special care was taken to minimize the impact of the sensors on the target’s lifetime. We also placed accelerometers outside the target to try correlating the outside measurements with the internal measurements. Remote manipulators performed the final part of the installation, as even residual radiation is too high for humans to come close to the target’s final location. The initial set of optical sensors on the first instrumented target lasted just long enough to give us measurements from different proton beam intensities. A second set of more rad-hard sensors, installed in the following target, lasted much longer, to give us considerably more data. We are developing our own rad-hard, single-mode fiber optic sensors. This paper describes the design, installation, data-acquisition system, the results of the strain sensors, and future plans.

Slides THAM2Y01 [13.157 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM2Y01

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

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]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM3Y01

Export •

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

THAM4Y01

New Arrangement of Collimators of J-PARC Main Ring

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]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-HB2016-THAM4Y01

Export •

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