IBIC2017 - List of Authors (Kobayashi, A.)

Paper	Title	Page
TUPCF11	Upgrade of the Beam Position Monitoring System at the J-PARC Main Ring for High Intensity Operation	229
	A. Kobayashi, H. Kuboki, K. Satou, T. Toyama KEK, Tokai, Ibaraki, Japan
	For the T2K neutrino oscillation experiment upgrade programs of J-PARC are on-going for higher beam intensity. The ultimate goal is to achieve a beam power of 1.3 MW in the main ring, a significant increase more than triple intensity compared to the presently achieved power of 470 kW. Beam loss is a cause of the limitation on the proton bunch intensity. A precise orbit correction is necessary in order to reduce the beam loss. Beam position monitor (BPM) is a vital element providing accurate measurements of the beam positions for the control of closed orbit distortion (COD). Currently an apparent dependence of COD RMS on the beam intensity is observed (about 30 μ m). In order to understand the nature of the phenomenon, investigations are being made on the BPM response and its intensity dependence as well as on the effects of wake field, beam bumps to COD and septum. Status of the studies will be discussed. Also presented are new design of BPM for improved position resolution and stability, and its expected performance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF11
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Paper

Title

Page

Upgrade of the Beam Position Monitoring System at the J-PARC Main Ring for High Intensity Operation

229

A. Kobayashi, H. Kuboki, K. Satou, T. Toyama
KEK, Tokai, Ibaraki, Japan

For the T2K neutrino oscillation experiment upgrade programs of J-PARC are on-going for higher beam intensity. The ultimate goal is to achieve a beam power of 1.3 MW in the main ring, a significant increase more than triple intensity compared to the presently achieved power of 470 kW. Beam loss is a cause of the limitation on the proton bunch intensity. A precise orbit correction is necessary in order to reduce the beam loss. Beam position monitor (BPM) is a vital element providing accurate measurements of the beam positions for the control of closed orbit distortion (COD). Currently an apparent dependence of COD RMS on the beam intensity is observed (about 30 μ m). In order to understand the nature of the phenomenon, investigations are being made on the BPM response and its intensity dependence as well as on the effects of wake field, beam bumps to COD and septum. Status of the studies will be discussed. Also presented are new design of BPM for improved position resolution and stability, and its expected performance.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF11

Export •

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