JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{tomizawa:hb2021-thdc1,
author = {M. Tomizawa and Y. Arakaki and T. Kimura and S. Murasugi and R. Muto and H. Nishiguchi and K. Noguchi and K. Okamura and Y. Shirakabe and Y. Sugiyama and F. Tamura and E. Yanaoka and M. Yoshii},
% author = {M. Tomizawa and Y. Arakaki and T. Kimura and S. Murasugi and R. Muto and H. Nishiguchi and others},
% author = {M. Tomizawa and others},
title = {{Slow Extraction Operation at J-PARC Main Ring}},
% booktitle = {Proc. HB'21},
booktitle = {Proc. 64th Adv. Beam Dyn. Workshop High-Intensity High-Brightness Hadron Beams (HB'21)},
eventdate = {2021-10-04/2021-10-08},
pages = {219--224},
paper = {THDC1},
language = {english},
keywords = {extraction, operation, timing, experiment, septum},
venue = {Batavia, IL, USA},
series = {ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams},
number = {64},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {03},
year = {2024},
issn = {2673-5571},
isbn = {978-3-95450-225-7},
doi = {10.18429/JACoW-HB2021-THDC1},
url = {https://jacow.org/hb2021/papers/thdc1.pdf},
abstract = {{A high-intensity proton beam accelerated in the J-PARC main ring (MR) is slowly extracted by using the third integer resonance and delivered to the experimental hall. A critical issue in slow extraction (SX) is a beam loss caused during the extraction. A dynamic bump scheme under an achromatic condition provides extremely high extraction efficiency. We have encountered a beam instability in the debunch formation process, which is estimated to be triggered by a longitudinal microstructure of the beam. To suppress this instability, the beam to the MR has been injected into the RF bucket with a phase offset. A newly developed RF manipulation, 2-step voltage debunch, has successfully pushed up the beam power up to 64.6 kW keeping a high extraction efficiency of 99.5\%. A drastic beam loss reduction has been demonstrated in the beam test using a diffuser installed upstream of the first electrostatic septum (ESS1). 8 GeV bunched slow extraction tests for the neutrino-less muon to electron conversion search experiment (COMET Phase-I) have been successfully conducted.}},
}