ICALEPCS2013 - List of Authors (Kaji, H.)

Paper

Title

Page

Design and Status of the SuperKEKB Accelerator Control System

4

M. Iwasaki, A. Akiyama, K. Furukawa, H. Kaji, T. Naito, T.T. Nakamura, J.-I. Odagiri, S. Sasaki
KEK, Ibaraki, Japan
T. Aoyama, M. Fujita, T. Nakamura, N. Tanaka, K. Yoshii
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
M. Hirose, K. Iwase
KIS, Ibaraki, Japan
T. Okazaki, N. Yoshifuji
EJIT, Hitachi, Ibaraki, Japan

SuperKEKB is the upgrade of the KEKB asymmetric energy e⁺e⁻ collider, for the B-factory experiment in Japan, designed to achieve a 40-times higher luminosity than the world record by KEKB. The KEKB control system was based on EPICS at the equipment layer and scripting languages at the operation layer. The SuperKEKB control system continues to employ those features, while we implement additional technologies for the successful operation at such a high luminosity. In the accelerator control network system, we introduce 10GbE for the wider bandwidth data transfer, and redundant configurations for reliability. The network security is also enhanced. For the SuperKEKB construction, the wireless network is installed into the beamline tunnel. In the timing system, the new configuration for positron beams is required. We have developed the faster response beam abort system, interface modules to control thousands magnet power supplies, and the monitoring system for the final focusing superconducting magnets to assure stable operations. We introduce the EPICS embedded PLC, where EPICS runs on a CPU module. The design and status of the SuperKEKB accelerator control system will be presented.

Slides MOCOAAB02 [5.930 MB]

TUPPC089

Upgrade of the Power Supply Interface Controller Module for SuperKEKB

790

T.T. Nakamura, A. Akiyama, K. Furukawa, M. Iwasaki, H. Kaji, S. Sasaki
KEK, Ibaraki, Japan

There were more than 2500 magnet power supplies for KEKB storage rings and injection beam transport lines. For the remote control of such a large number of power supplies, we have developed the Power Supply Interface Controller Module (PSICM), which is plugged into each power supply. It has a microprocessor, ARCNET interface, trigger signal input interface, and parallel interface to the power supply. The PSICM is not only an interface card but also controls synchronous operation of the multiple power supplies with an arbitrary tracking curve. For SuperKEKB, the upgrade of KEKB, most of the existing power supplies continues while handreds of new power suplies are also installed. Although the PSICMs have worked without serious problem for 12 years, it seems too hard to keep maintenance for the next decade because of the discontinued parts. Thus we have developed the upgraded version of the PSICM. The new PSICM has the fully backward compatible interface to the power supply. The enhanced features are high speed ARCNET communication and redundant trigger signals. The design and the status of the upgraded PSICM are presented.

Poster TUPPC089 [1.516 MB]

THPPC009

Design and Status of the SuperKEKB Accelerator Control Network System

1107

M. Iwasaki, K. Furukawa, H. Kaji, K. Mikawa, T.T. Nakamura, T. Obina, M. Satoh
KEK, Ibaraki, Japan
T. Aoyama, M. Fujita, S. Kusano, T. Nakamura, N. Tanaka, K. Yoshii
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

SuperKEKB is the upgrade of the KEKB asymmetric energy electron-positron collider, for the next generation B-factory experiment in Japan. It is designed to achieve a luminosity of 8x10³⁵/cm²/s, 40 times higher than the world highest luminosity record at KEKB. For SuperKEKB, we upgrade the accelerator control network system, which connects all devices in the accelerator. To construct the higher performance network system, we install the network switches based on the 10 gigabit Ethernet (10GbE) for the wider bandwidth data transfer. Additional optical fibers, for the reliable and redundant network and for the robust accelerator control timing system, are also installed. For the KEKB beamline construction and accelerator components maintenance, we install the new wireless network system based on the Leaky Coaxial (LCX) cable antennas into the 3 km circumference beamline tunnel. We reconfigure the network design to enhance the reliability and security of the network. In this paper, the design and current status of the SuperKEKB accelerator control network system will be presented.

Poster THPPC009 [1.143 MB]

THCOCA04

Upgrade of Event Timing System at SuperKEKB

1453

H. Kaji, K. Furukawa, M. Iwasaki, E. Kikutani, T. Kobayashi, F. Miyahara, T.T. Nakamura, M. Suetake, M. Tobiyama
KEK, Ibaraki, Japan
T. Kudo, S. Kusano
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
T. Okazaki
EJIT, Hitachi, Ibaraki, Japan

The timing system of the KEKB accelerator will be upgraded for the SuperKEKB project. One of difficulties at SuperKEKB is the positron injection. It takes more than 40ms since positron pulse must be stored at newly constructed damping ring for at least 40ms. Timings of whole accelerators are precisely synchronized for such a long period. We must manage highly frequent injections even with this situation. Typically beam pulse is delivered to one of rings at every 20ms. Besides, the new system must have a capability of realtime selection of injection RF-bucket - we call it "Bucket Selection" at KEKB - for equalizing bunch current at main rings. Bucket Selection also will be upgraded to synchronize buckets of damping ring and those of main rings. This includes the expansion of maximum delay time up to 2ms and the pulse-by-pulse shift of RF phase at 2nd half of injection Linac. We plan to upgrade the Event Timing System from "2-layer type", which simply connect one generator and one receiver, to "cascade type" for satisfying the new injection requirements. We report the basic design of the new timing system and recent studies about key elements of Event Timing System instruments.

Slides THCOCA04 [1.559 MB]

FRCOBAB04

Beam Feedback System Challenges at SuperKEKB Injector Linac

1497

K. Furukawa, R. Ichimiya, M. Iwasaki, H. Kaji, F. Miyahara, T.T. Nakamura, M. Satoh, T. Suwada
KEK, Ibaraki, Japan

SuperKEKB electron/positron asymmetric collider is under construction in order to elucidate new physics beyond the standard model of elementary particle physics. This will be only possible by a precise measurement with 40-times higher luminosity compared with that of KEKB. The injector linac should be upgraded to enable a 20-times smaller beam size of 50 nm at the collision point and twice-larger stored beam current with short lifetime of 10 minutes. At the same time two light source rings, PF and PF-AR, should be filled in top-up injection mode. To this end the linac should be operated with precise beam controls. Dual-layer controls with EPICS and MRF event systems are being enhanced to support precise pulse-to-pulse beam modulation (PPM) at 50Hz. A virtual accelerator (VA) concept is introduced to enable a single linac behaving as four VAs switched by PPM, where each VA corresponds to one of four top-up injections into storage rings. Each VA should be accompanied with independent beam orbit and energy feedback loops to maintain the required beam qualities. The requirements from SuperKEKB HER and LER for beam emittance, energy-spread, and charge are especially challenging.

Slides FRCOBAB04 [1.596 MB]

Paper	Title	Page
MOCOAAB02	Design and Status of the SuperKEKB Accelerator Control System	4
	M. Iwasaki, A. Akiyama, K. Furukawa, H. Kaji, T. Naito, T.T. Nakamura, J.-I. Odagiri, S. Sasaki KEK, Ibaraki, Japan T. Aoyama, M. Fujita, T. Nakamura, N. Tanaka, K. Yoshii Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan M. Hirose, K. Iwase KIS, Ibaraki, Japan T. Okazaki, N. Yoshifuji EJIT, Hitachi, Ibaraki, Japan
	SuperKEKB is the upgrade of the KEKB asymmetric energy e⁺e⁻ collider, for the B-factory experiment in Japan, designed to achieve a 40-times higher luminosity than the world record by KEKB. The KEKB control system was based on EPICS at the equipment layer and scripting languages at the operation layer. The SuperKEKB control system continues to employ those features, while we implement additional technologies for the successful operation at such a high luminosity. In the accelerator control network system, we introduce 10GbE for the wider bandwidth data transfer, and redundant configurations for reliability. The network security is also enhanced. For the SuperKEKB construction, the wireless network is installed into the beamline tunnel. In the timing system, the new configuration for positron beams is required. We have developed the faster response beam abort system, interface modules to control thousands magnet power supplies, and the monitoring system for the final focusing superconducting magnets to assure stable operations. We introduce the EPICS embedded PLC, where EPICS runs on a CPU module. The design and status of the SuperKEKB accelerator control system will be presented.
	Slides MOCOAAB02 [5.930 MB]

TUPPC089	Upgrade of the Power Supply Interface Controller Module for SuperKEKB	790
	T.T. Nakamura, A. Akiyama, K. Furukawa, M. Iwasaki, H. Kaji, S. Sasaki KEK, Ibaraki, Japan
	There were more than 2500 magnet power supplies for KEKB storage rings and injection beam transport lines. For the remote control of such a large number of power supplies, we have developed the Power Supply Interface Controller Module (PSICM), which is plugged into each power supply. It has a microprocessor, ARCNET interface, trigger signal input interface, and parallel interface to the power supply. The PSICM is not only an interface card but also controls synchronous operation of the multiple power supplies with an arbitrary tracking curve. For SuperKEKB, the upgrade of KEKB, most of the existing power supplies continues while handreds of new power suplies are also installed. Although the PSICMs have worked without serious problem for 12 years, it seems too hard to keep maintenance for the next decade because of the discontinued parts. Thus we have developed the upgraded version of the PSICM. The new PSICM has the fully backward compatible interface to the power supply. The enhanced features are high speed ARCNET communication and redundant trigger signals. The design and the status of the upgraded PSICM are presented.
	Poster TUPPC089 [1.516 MB]

THPPC009	Design and Status of the SuperKEKB Accelerator Control Network System	1107
	M. Iwasaki, K. Furukawa, H. Kaji, K. Mikawa, T.T. Nakamura, T. Obina, M. Satoh KEK, Ibaraki, Japan T. Aoyama, M. Fujita, S. Kusano, T. Nakamura, N. Tanaka, K. Yoshii Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
	SuperKEKB is the upgrade of the KEKB asymmetric energy electron-positron collider, for the next generation B-factory experiment in Japan. It is designed to achieve a luminosity of 8x10³⁵/cm²/s, 40 times higher than the world highest luminosity record at KEKB. For SuperKEKB, we upgrade the accelerator control network system, which connects all devices in the accelerator. To construct the higher performance network system, we install the network switches based on the 10 gigabit Ethernet (10GbE) for the wider bandwidth data transfer. Additional optical fibers, for the reliable and redundant network and for the robust accelerator control timing system, are also installed. For the KEKB beamline construction and accelerator components maintenance, we install the new wireless network system based on the Leaky Coaxial (LCX) cable antennas into the 3 km circumference beamline tunnel. We reconfigure the network design to enhance the reliability and security of the network. In this paper, the design and current status of the SuperKEKB accelerator control network system will be presented.
	Poster THPPC009 [1.143 MB]

THCOCA04	Upgrade of Event Timing System at SuperKEKB	1453
	H. Kaji, K. Furukawa, M. Iwasaki, E. Kikutani, T. Kobayashi, F. Miyahara, T.T. Nakamura, M. Suetake, M. Tobiyama KEK, Ibaraki, Japan T. Kudo, S. Kusano Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan T. Okazaki EJIT, Hitachi, Ibaraki, Japan
	The timing system of the KEKB accelerator will be upgraded for the SuperKEKB project. One of difficulties at SuperKEKB is the positron injection. It takes more than 40ms since positron pulse must be stored at newly constructed damping ring for at least 40ms. Timings of whole accelerators are precisely synchronized for such a long period. We must manage highly frequent injections even with this situation. Typically beam pulse is delivered to one of rings at every 20ms. Besides, the new system must have a capability of realtime selection of injection RF-bucket - we call it "Bucket Selection" at KEKB - for equalizing bunch current at main rings. Bucket Selection also will be upgraded to synchronize buckets of damping ring and those of main rings. This includes the expansion of maximum delay time up to 2ms and the pulse-by-pulse shift of RF phase at 2nd half of injection Linac. We plan to upgrade the Event Timing System from "2-layer type", which simply connect one generator and one receiver, to "cascade type" for satisfying the new injection requirements. We report the basic design of the new timing system and recent studies about key elements of Event Timing System instruments.
	Slides THCOCA04 [1.559 MB]

FRCOBAB04	Beam Feedback System Challenges at SuperKEKB Injector Linac	1497
	K. Furukawa, R. Ichimiya, M. Iwasaki, H. Kaji, F. Miyahara, T.T. Nakamura, M. Satoh, T. Suwada KEK, Ibaraki, Japan
	SuperKEKB electron/positron asymmetric collider is under construction in order to elucidate new physics beyond the standard model of elementary particle physics. This will be only possible by a precise measurement with 40-times higher luminosity compared with that of KEKB. The injector linac should be upgraded to enable a 20-times smaller beam size of 50 nm at the collision point and twice-larger stored beam current with short lifetime of 10 minutes. At the same time two light source rings, PF and PF-AR, should be filled in top-up injection mode. To this end the linac should be operated with precise beam controls. Dual-layer controls with EPICS and MRF event systems are being enhanced to support precise pulse-to-pulse beam modulation (PPM) at 50Hz. A virtual accelerator (VA) concept is introduced to enable a single linac behaving as four VAs switched by PPM, where each VA corresponds to one of four top-up injections into storage rings. Each VA should be accompanied with independent beam orbit and energy feedback loops to maintain the required beam qualities. The requirements from SuperKEKB HER and LER for beam emittance, energy-spread, and charge are especially challenging.
	Slides FRCOBAB04 [1.596 MB]