IBIC2014 - List of Authors (Tobiyama, M.)

Paper	Title	Page
MOCYB2	Design and Initial Commissioning of Beam Diagnostics for the KEK Compact ERL	7
	R. Takai, T. Honda, T. Nogami, T. Obina, H. Sagehashi, Y. Tanimoto, M. Tobiyama KEK, Ibaraki, Japan
	A compact energy-recovery linac (cERL) was constructed at KEK as a test accelerator for the ERL-based light source. Standard beam monitors such as beam position monitors (BPMs), screen monitors (SCMs), and beam loss monitors (BLMs) have been developed for the cERL and used in its commissioning. For the main BPMs, we adopted the stripline type, the time response of which is improved by using a glass-sealed feedthrough. The SCMs are equipped with two types of screens and an RF shield for wake-field suppression. Optical fibers with photomultiplier tubes (PMTs), covering the entire cERL circumference, are used as the BLM. CsI scintillators with large-cathode PMTs are also prepared for detecting local beam loss. The design and some initial commissioning results of these standard monitors are described in this paper.
	Slides MOCYB2 [4.987 MB]
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TUPD22	Beam Loss Monitor at SuperKEKB	459
	H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, M. Tobiyama KEK, Ibaraki, Japan
	We will use beam loss monitors for protection of the hardware of SuperKEKB against the unexpected sudden beam loss. The sensors are ion chambers and PIN photo-diodes. The loss monitor system gives an important trigger for the beam abort system. We can optimize the threshold of the abort trigger by checking the beam information at each abort moment. This paper explains the overall system of the SuperKEKB beam loss monitors including the damping ring.
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WEPD05	Improvement of Data Transfer Speed of Large Memory Monitors	642
	M. Tobiyama KEK, Ibaraki, Japan
	Beam monitors with long memories will be widely used in SuperKEKB accelerators. Since the slow data transfer time of such devices usually limit the operational performance, improvement of the transfer rate is required. Two kind of devices, VME-based module and Ethernet-based modules has been developed. On the VME-based devices such as turn-by-turn position monitors for damping ring or long bunch oscillation monitors, MBLT and BLT transfer method has been implemented. For the Ethernet based system, the gated turn-by-turn monitors, SiTCP has been implemented on the FPGA and the EPICS device support for SiTCP has been developed. The improvement of the data transfer speed with the long-term reliability will be presented.
	Poster WEPD05 [1.791 MB]
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THCXB2	Performance Evaluation of the Intra-Bunch Feedback System at J-PARC Main Ring	727
	K.G. Nakamura Kyoto University, Kyoto, Japan Y.H. Chin, T. Koseki, H. Kuboki, M. Okada, M. Tobiyama KEK, Ibaraki, Japan Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Intra-bunch feedback system in J-PARC (Japan Proton Accelerator Complex) Main Ring(MR) has been developed for suppression of head-tail motion and reduction of beam loss. This system consists of mainly BPM, signal processing circuit (iGp12), power amplifiers, and stripline kickers. These components were fabricated and installed in April of 2014. This system succeeded in suppressing the internal bunch motion caused by injection kicker error in the 3GeV constant-energy operation, and showed shorter damping time compared to the bunch by bunch feedback system, which is currently working in the normal operation. In this paper, we will report the performance of the system by comparison with simulations.
	Slides THCXB2 [6.430 MB]
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Paper

Title

Page

Design and Initial Commissioning of Beam Diagnostics for the KEK Compact ERL

7

R. Takai, T. Honda, T. Nogami, T. Obina, H. Sagehashi, Y. Tanimoto, M. Tobiyama
KEK, Ibaraki, Japan

A compact energy-recovery linac (cERL) was constructed at KEK as a test accelerator for the ERL-based light source. Standard beam monitors such as beam position monitors (BPMs), screen monitors (SCMs), and beam loss monitors (BLMs) have been developed for the cERL and used in its commissioning. For the main BPMs, we adopted the stripline type, the time response of which is improved by using a glass-sealed feedthrough. The SCMs are equipped with two types of screens and an RF shield for wake-field suppression. Optical fibers with photomultiplier tubes (PMTs), covering the entire cERL circumference, are used as the BLM. CsI scintillators with large-cathode PMTs are also prepared for detecting local beam loss. The design and some initial commissioning results of these standard monitors are described in this paper.

Slides MOCYB2 [4.987 MB]

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TUPD22

Beam Loss Monitor at SuperKEKB

459

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

We will use beam loss monitors for protection of the hardware of SuperKEKB against the unexpected sudden beam loss. The sensors are ion chambers and PIN photo-diodes. The loss monitor system gives an important trigger for the beam abort system. We can optimize the threshold of the abort trigger by checking the beam information at each abort moment. This paper explains the overall system of the SuperKEKB beam loss monitors including the damping ring.

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WEPD05

Improvement of Data Transfer Speed of Large Memory Monitors

642

M. Tobiyama
KEK, Ibaraki, Japan

Beam monitors with long memories will be widely used in SuperKEKB accelerators. Since the slow data transfer time of such devices usually limit the operational performance, improvement of the transfer rate is required. Two kind of devices, VME-based module and Ethernet-based modules has been developed. On the VME-based devices such as turn-by-turn position monitors for damping ring or long bunch oscillation monitors, MBLT and BLT transfer method has been implemented. For the Ethernet based system, the gated turn-by-turn monitors, SiTCP has been implemented on the FPGA and the EPICS device support for SiTCP has been developed. The improvement of the data transfer speed with the long-term reliability will be presented.

Poster WEPD05 [1.791 MB]

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THCXB2

Performance Evaluation of the Intra-Bunch Feedback System at J-PARC Main Ring

727

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

Intra-bunch feedback system in J-PARC (Japan Proton Accelerator Complex) Main Ring(MR) has been developed for suppression of head-tail motion and reduction of beam loss. This system consists of mainly BPM, signal processing circuit (iGp12), power amplifiers, and stripline kickers. These components were fabricated and installed in April of 2014. This system succeeded in suppressing the internal bunch motion caused by injection kicker error in the 3GeV constant-energy operation, and showed shorter damping time compared to the bunch by bunch feedback system, which is currently working in the normal operation. In this paper, we will report the performance of the system by comparison with simulations.

Slides THCXB2 [6.430 MB]

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