IPAC2011 - List of Authors (Igarashi, S.)

Paper	Title	Page
MOPS005	Beam Dynamics Simulations of J-PARC Main Ring for Upgrade Plan of Fast Extraction Operation	598
	Y. Sato, K. Hara, S. Igarashi, T. Koseki, K. Ohmi, C. Ohmori, M. Tomizawa KEK, Ibaraki, Japan H. Hotchi JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	Beam loss simulations under space charge effects are necessary to seek higher intensity proton beams. This paper presents simulations for fast extraction operation of Japan Proton Accelerator Research Complex (J-PARC) Main Ring. For upgrade plan, increasing protons per bunch and making higher repetition pattern are considered. Their optimal balance is discussed to minimize beam losses for aimed beam power considering space charge effects. We found that to optimize RF voltage pattern is a strong key to reduce beam losses for higher repetition. As benchmark works, we compare our simulations with the measured beam loss in our past operation.

TUPC098	Beam Profile Measurement using Flying Wire Monitors at the J-PARC Main Ring*	1239
	S. Igarashi, K. Ohmi, Y. Sato, M.J. Shirakata, M. Tejima, T. Toyama KEK, Ibaraki, Japan Y. Hashimoto, K. Satou J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Transverse beam profiles have been measured using flying wire monitors at the main ring of the Japan Proton Accelerator Research Complex (J-PARC). The flying wire is a beam profile monitor using a thin carbon fiber as a target. The beam is scanned with the wire target at the maximum speed of 5 m/s. The secondary particles from the beam-wire scattering are detected using a scintillation counter as a function of the wire position. The measurement has revealed a characteristic temporal change of the beam profile during the injection period of 120 ms. A multiparticle tracking simulation program, SCTR, taking account of space charge effects has successfully reproduced the beam profiles.

THPO003	Rapid-cycling Power Supplies for the J-PARC RCS Sextupole Magnets	3338
	Y. Watanabe JAEA, Ibaraki-ken, Japan T. Adachi, S. Igarashi, H. Someya KEK, Ibaraki, Japan N. Tani JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	The rapid-cycling synchrotron of the Japan Proton Accelerator Research Complex requires 18 sextupole magnets with three families for the chromaticity correction. One family consists of six focusing sextupole magnets, and other two families consist of six defocusing sextupole magnts. An individual power supply excited for each family and the current pattern is a DC-biased sinusoidal of a frequency of 25 Hz. This paper describes design and test results of the sextupole magnet power supplies.

Paper

Title

Page

Beam Dynamics Simulations of J-PARC Main Ring for Upgrade Plan of Fast Extraction Operation

598

Y. Sato, K. Hara, S. Igarashi, T. Koseki, K. Ohmi, C. Ohmori, M. Tomizawa
KEK, Ibaraki, Japan
H. Hotchi
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

Beam loss simulations under space charge effects are necessary to seek higher intensity proton beams. This paper presents simulations for fast extraction operation of Japan Proton Accelerator Research Complex (J-PARC) Main Ring. For upgrade plan, increasing protons per bunch and making higher repetition pattern are considered. Their optimal balance is discussed to minimize beam losses for aimed beam power considering space charge effects. We found that to optimize RF voltage pattern is a strong key to reduce beam losses for higher repetition. As benchmark works, we compare our simulations with the measured beam loss in our past operation.

TUPC098

Beam Profile Measurement using Flying Wire Monitors at the J-PARC Main Ring*

1239

S. Igarashi, K. Ohmi, Y. Sato, M.J. Shirakata, M. Tejima, T. Toyama
KEK, Ibaraki, Japan
Y. Hashimoto, K. Satou
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Transverse beam profiles have been measured using flying wire monitors at the main ring of the Japan Proton Accelerator Research Complex (J-PARC). The flying wire is a beam profile monitor using a thin carbon fiber as a target. The beam is scanned with the wire target at the maximum speed of 5 m/s. The secondary particles from the beam-wire scattering are detected using a scintillation counter as a function of the wire position. The measurement has revealed a characteristic temporal change of the beam profile during the injection period of 120 ms. A multiparticle tracking simulation program, SCTR, taking account of space charge effects has successfully reproduced the beam profiles.

THPO003

Rapid-cycling Power Supplies for the J-PARC RCS Sextupole Magnets

3338

Y. Watanabe
JAEA, Ibaraki-ken, Japan
T. Adachi, S. Igarashi, H. Someya
KEK, Ibaraki, Japan
N. Tani
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

The rapid-cycling synchrotron of the Japan Proton Accelerator Research Complex requires 18 sextupole magnets with three families for the chromaticity correction. One family consists of six focusing sextupole magnets, and other two families consist of six defocusing sextupole magnts. An individual power supply excited for each family and the current pattern is a DC-biased sinusoidal of a frequency of 25 Hz. This paper describes design and test results of the sextupole magnet power supplies.