DIPAC2011 - List of Authors (Tobiyama, M.)

Paper

Title

Page

Study of Beam Size Blowup due to Transverse Bunch Feedback Noise on e⁺e⁻ Collider

212

M. Tobiyama, K. Ohmi
KEK, Ibaraki, Japan

Vertical beam size blowup with the gain of the transverse bunch feedback systems has been observed in KEKB B-factory rings. With the numerical simulation, large beam-beam effect enhances small oscillation induced by the broadband noise of the bunch feedback kick. To examine the simulation, beam response, effective beam size and the luminosity change with artificial external noise injected in the transverse feedback system have beem measuredn in KEKB LER ring during collision. The result has been compaired with the simulation including beam-beam effect and showed good agreement.

Poster MOPD73 [0.296 MB]

TUPD74

The Bunch by Bunch Feedback System in J-PARC Main Ring

482

Y. Kurimoto, Y.H. Chin, T. Obina, M. Tobiyama, T. Toyama
KEK, Ibaraki, Japan
Y. Shobuda
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

We report the current status of the bunch by bunch feedback system for the J-PARC Main Ring. The J-PARC Main Ring is the synchrotron accelerating protons from 3 GeV to 30 GeV. It is normally operating at the intensity of 135 kW. The bunch by bunch feedback system have been developed and used for the normal operation of J-PARC Main Ring. The system aims to reduce the coherent transverse oscillation due to the instabilities or injection errors. It consists of a beam position monitor, a stripline kicker and a signal processing electronics. We've observed the injection error leading to the head-tail oscillation and succeed in damping such kind of oscillations and reducing the beam loss significantly.

Poster TUPD74 [1.107 MB]

Paper	Title	Page
MOPD73	Study of Beam Size Blowup due to Transverse Bunch Feedback Noise on e⁺e⁻ Collider	212
	M. Tobiyama, K. Ohmi KEK, Ibaraki, Japan
	Vertical beam size blowup with the gain of the transverse bunch feedback systems has been observed in KEKB B-factory rings. With the numerical simulation, large beam-beam effect enhances small oscillation induced by the broadband noise of the bunch feedback kick. To examine the simulation, beam response, effective beam size and the luminosity change with artificial external noise injected in the transverse feedback system have beem measuredn in KEKB LER ring during collision. The result has been compaired with the simulation including beam-beam effect and showed good agreement.
	Poster MOPD73 [0.296 MB]

TUPD74	The Bunch by Bunch Feedback System in J-PARC Main Ring	482
	Y. Kurimoto, Y.H. Chin, T. Obina, M. Tobiyama, T. Toyama KEK, Ibaraki, Japan Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	We report the current status of the bunch by bunch feedback system for the J-PARC Main Ring. The J-PARC Main Ring is the synchrotron accelerating protons from 3 GeV to 30 GeV. It is normally operating at the intensity of 135 kW. The bunch by bunch feedback system have been developed and used for the normal operation of J-PARC Main Ring. The system aims to reduce the coherent transverse oscillation due to the instabilities or injection errors. It consists of a beam position monitor, a stripline kicker and a signal processing electronics. We've observed the injection error leading to the head-tail oscillation and succeed in damping such kind of oscillations and reducing the beam loss significantly.
	Poster TUPD74 [1.107 MB]