IBIC2015 - List of Authors (Tobiyama, M.)

Paper

Title

Page

Data Acquisition System for SuperKEKB Beam Loss Monitors

75

M. Tobiyama, J.W. Flanagan, H. Ikeda
KEK, Ibaraki, Japan

The monitoring of the beam loss distribution along the accelerator is important in order to prevent damage of the vacuum components, and, in addition, to suppress the unnecessary irradiation of the accelerator elements. As it is not easy to construct the readout system to be synchronised to a fast timing signal, such as beam injection, a new 64-ch ADC system has been developed that samples the output of the loss monitor signal integrator with a fairly fast rate and automatically keeps the peak, mean and minimum of the data. The performance of the ADC system will be shown. The control system configuration that reads and resets the hardware interlock signal from the loss monitor signal integrator for the machine protection system (MPS) will also be presented.

Poster MOPB018 [0.362 MB]

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TUBLA03

Status of the Intra-bunch Feedback at J-PARC Main Ring

T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
Y.H. Chin, T. Koseki, H. Kuboki, T. Obina, M. Okada, M. Tobiyama
KEK, Ibaraki, Japan
K.G. Nakamura
Kyoto University, Kyoto, Japan
Y. Shobuda
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

Funding: This work is partially supported by MEXT KAKENHI Grant Number 25105002, "Grant-in-Aid for Scientific Research on Innovative Areas titled Unification and Development of the Neutrino Science Frontier"
One of the present obstacles for intensity upgrade of the J-PARC Main Ring is transverse collective instability. We have been developing so called intra-bunch feedback system and in operation during injection flat bottom since last year. But recent beam intensity upgrade push us to improve further the system, namely feedback during acceleration. The revolution frequency changes about 2% and the synchronous phase varies 0 - 26 degree during acceleration from 3 to 30 GeV in the MR. The delay in the feedback loop is changed stepwise triggered by external pulses. We are examining quick trigger timing determination by matching the bunch shape in the controller ("iGp12") to the one from the exciter (kicker) and estimating differences of slice markers in time. This method is time saving, which is important because of a limited machine tuning time. We will report present status of the feedback during acceleration.

Slides TUBLA03 [5.309 MB]

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Paper	Title	Page
MOPB018	Data Acquisition System for SuperKEKB Beam Loss Monitors	75
	M. Tobiyama, J.W. Flanagan, H. Ikeda KEK, Ibaraki, Japan
	The monitoring of the beam loss distribution along the accelerator is important in order to prevent damage of the vacuum components, and, in addition, to suppress the unnecessary irradiation of the accelerator elements. As it is not easy to construct the readout system to be synchronised to a fast timing signal, such as beam injection, a new 64-ch ADC system has been developed that samples the output of the loss monitor signal integrator with a fairly fast rate and automatically keeps the peak, mean and minimum of the data. The performance of the ADC system will be shown. The control system configuration that reads and resets the hardware interlock signal from the loss monitor signal integrator for the machine protection system (MPS) will also be presented.
	Poster MOPB018 [0.362 MB]
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TUBLA03	Status of the Intra-bunch Feedback at J-PARC Main Ring
	T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan Y.H. Chin, T. Koseki, H. Kuboki, T. Obina, M. Okada, M. Tobiyama KEK, Ibaraki, Japan K.G. Nakamura Kyoto University, Kyoto, Japan Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	Funding: This work is partially supported by MEXT KAKENHI Grant Number 25105002, "Grant-in-Aid for Scientific Research on Innovative Areas titled Unification and Development of the Neutrino Science Frontier" One of the present obstacles for intensity upgrade of the J-PARC Main Ring is transverse collective instability. We have been developing so called intra-bunch feedback system and in operation during injection flat bottom since last year. But recent beam intensity upgrade push us to improve further the system, namely feedback during acceleration. The revolution frequency changes about 2% and the synchronous phase varies 0 - 26 degree during acceleration from 3 to 30 GeV in the MR. The delay in the feedback loop is changed stepwise triggered by external pulses. We are examining quick trigger timing determination by matching the bunch shape in the controller ("iGp12") to the one from the exciter (kicker) and estimating differences of slice markers in time. This method is time saving, which is important because of a limited machine tuning time. We will report present status of the feedback during acceleration.
	Slides TUBLA03 [5.309 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)