HB2018 - List of Keywords (septum)

Paper	Title	Other Keywords	Page
WEP2PO017	Study on the Leakage Fields of the Septum and Lambertson Magnets during the Beam Commissioning	injection, MMI, neutron, extraction	303
	M.Y. Huang, S. Wang, S.Y. Xu IHEP, Beijing, People's Republic of China
	For China Spallation Neutron Source (CSNS), the septum magnets are the key part of the injection system and the lambertson magnet is the key part of the extraction system. If the leakage fields of the septum and lambertson magnets are large enough, the circular beam orbit of Rapid Cycling Synchrotron (RCS) would be affected. In this paper, during the beam commissioning, the leakage fields of the septum and lambertson magnets will be studied and their effects on the circular beam orbit will be given and discussed.
	Poster WEP2PO017 [0.852 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THA1WD03	Status and Beam Power Ramp-Up Plans of the Slow Extraction Operation at J-Parc Main Ring	extraction, operation, proton, quadrupole	347
	M. Tomizawa, Y. Arakaki, T. Kimura, S. Murasugi, R. Muto, K. Okamura, Y. Shirakabe, E. Yanaoka KEK, Ibaraki, Japan
	A 30 GeV proton beam accelerated in the J-PARC Main Ring (MR) is slowly extracted by the third integer resonant extraction and delivered to the hadron experimental hall. Slow extraction from the MR has unique characteristics that can be used to obtain a low beam loss rate. Devices with electrostatic septum (ESSs) and magnetic septa are placed in the long straight section with zero dispersion. The separatrix for the resonance is independent of the momentum at the septa when the horizontal chromaticity is set to zero. The resulting beam has a large step size and small angular spread, enabling a low hit rate of the beam at the first ESS. Under these conditions, a dynamic bump scheme has been applied to reduce the beam loss further. We have attained 50 kW operation at 5.2s cycle in the latest physics run. A suppression of instability during debunch process is also essential as well as low beam loss tunings. In this paper, a current status and future plans toward a higher beam power for the slow extraction are reported. Preliminary results for a 8 GeV slow extraction test for the muon to electron conversion search experiment (COMET) will be also briefly presented.
	Slides THA1WD03 [9.174 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-THA1WD03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

WEP2PO017

Study on the Leakage Fields of the Septum and Lambertson Magnets during the Beam Commissioning

injection, MMI, neutron, extraction

303

M.Y. Huang, S. Wang, S.Y. Xu
IHEP, Beijing, People's Republic of China

For China Spallation Neutron Source (CSNS), the septum magnets are the key part of the injection system and the lambertson magnet is the key part of the extraction system. If the leakage fields of the septum and lambertson magnets are large enough, the circular beam orbit of Rapid Cycling Synchrotron (RCS) would be affected. In this paper, during the beam commissioning, the leakage fields of the septum and lambertson magnets will be studied and their effects on the circular beam orbit will be given and discussed.

Poster WEP2PO017 [0.852 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEP2PO017

Export •

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

THA1WD03

Status and Beam Power Ramp-Up Plans of the Slow Extraction Operation at J-Parc Main Ring

extraction, operation, proton, quadrupole

347

M. Tomizawa, Y. Arakaki, T. Kimura, S. Murasugi, R. Muto, K. Okamura, Y. Shirakabe, E. Yanaoka
KEK, Ibaraki, Japan

A 30 GeV proton beam accelerated in the J-PARC Main Ring (MR) is slowly extracted by the third integer resonant extraction and delivered to the hadron experimental hall. Slow extraction from the MR has unique characteristics that can be used to obtain a low beam loss rate. Devices with electrostatic septum (ESSs) and magnetic septa are placed in the long straight section with zero dispersion. The separatrix for the resonance is independent of the momentum at the septa when the horizontal chromaticity is set to zero. The resulting beam has a large step size and small angular spread, enabling a low hit rate of the beam at the first ESS. Under these conditions, a dynamic bump scheme has been applied to reduce the beam loss further. We have attained 50 kW operation at 5.2s cycle in the latest physics run. A suppression of instability during debunch process is also essential as well as low beam loss tunings. In this paper, a current status and future plans toward a higher beam power for the slow extraction are reported. Preliminary results for a 8 GeV slow extraction test for the muon to electron conversion search experiment (COMET) will be also briefly presented.

Slides THA1WD03 [9.174 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-THA1WD03

Export •

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