ERL2015 - List of Authors (Obina, T.)

Paper

Title

Page

Design Work of the ERL-FEL as the High Intense EUV Light Source

4

N. Nakamura, S. Chen, T. Furuya, K. Haga, I. Hanyu, K. Harada, T. Honda, Y. Honda, E. Kako, Y. Kamiya, R. Kato, H. Kawata, Y. Kobayashi, T. Konomi, T. Kubo, S. Michizono, T. Miyajima, H. Nakai, T. Obina, K. Oide, H. Sakai, S. Sakanaka, M. Shimada, K. Tsuchiya, K. Umemori, M. Yamamoto
KEK, Ibaraki, Japan
R. Hajima, N. Nishimori
JAEA, Ibaraki-ken, Japan

Energy recovery linac(ERL)-based free electron lasers(FELs) are promising candidates for high-power EUV sources. They can recover most acceleration energy from the electron beams and greatly reduce the dumped beam power and activation compared with those based on ordinary linear accelerators. We have investigated a feasible design of a 10-kW class ERL-FEL operated at 13.5 nm for EUV lithography applications. In this talk, we will present the design work of the ERL-FEL as the high-power EUV source.

Slides MOPCTH010 [4.589 MB]

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TUPATH021

WG3 ERL Instrumentation and Controls

T. Obina
KEK, Ibaraki, Japan
C.M. Gulliford
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Place holder for possible Plenary Paper upload…

Slides TUPATH021 [1.433 MB]

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TUIBLH1020

Operational Experience of DC Photoemission Gun at the Compact ERL

N. Nishimori
JAEA/FEL, Ibaraki-ken, Japan
R. Hajima, R. Nagai
JAEA, Ibaraki-ken, Japan
Y. Honda, X.J. Jin, T. Miyajima, T. Obina, T. Uchiyama, M. Yamamoto
KEK, Ibaraki, Japan
M. Kuriki
HU/AdSM, Higashi-Hiroshima, Japan

Beam commissioning of the compact ERL (cERL) has been performed since Apr. 2013 for the next generation ERL light source project (PEARL), and x-ray generation via laser Compton scattering was demonstrated recently. We will present two years operational experience and future upgrade plan of the DC photoemission gun at the cERL.

Slides TUIBLH1020 [10.603 MB]

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WEIALH2045

Non-destructive Beam Position Monitoring in Two-Beam Section of ERL

T. Obina, R. Takai
KEK, Ibaraki, Japan

At the straight section with superconducting cavities, two beams with different energies are passing through same vacuum vessels, and separate measurements of such beams are essential for beam commissioning and tuning in energy recovery linacs. Destructive methods such as “screen monitor with a hole” are utilized in many ERLs in order to measure the recirculated beam; however, the method is not suitable for CW operation with high charge. In the compact ERL at KEK, typical macro-pulse length for beam tuning is 1000 ns. In the two-beam section, difference of arrival time of pre- and post-accelerated beam of 300 ns is long enough to separate two beams. We can measure the beam position by gating the signal from stripline electrode. The overlapped part of the two-beam signals is sensitive to the phase of two beams, and they can be utilized for path-length adjustment of the beam. The experimental results during the macro-pulse and CW operation will be presented in this paper.

Slides WEIALH2045 [0.728 MB]

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WEIDLH2066

Performance of the Digital LLRF Systems at KEK cERL

84

F. Qiu, D.A. Arakawa, Y. Honda, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, T. Obina, H. Sakai
KEK, Ibaraki, Japan
S.B. Wibowo
Sokendai, Ibaraki, Japan

A compact energy recovery linac (cERL), which is a test machine for the next generation synchrotron light source 3-GeV ERL, was constructed at KEK. In the cERL, a normal conducting (NC) buncher cavity and three superconducting (SC) two-cell cavities were installed for the injector, and two nine-cell SC cavities were installed for the main linac (ML). The radio-frequency (RF) fluctuations for each cavity are required to be maintained at less than 0.1% rms in amplitude and 0.1° in phase. These requirements are fulfilled by applying digital low-level radio-frequency (LLRF) systems. During the beam-commissioning, the LLRF systems were evaluated and validated. A measured beam momentum jitter of 0.006% shows that the target of the LLRF systems is achieved. To further improve the system performance, an adaptive feedforward (FF) control-based approach was proposed and demonstrated in the beam-commissioning. The current status of LLRF system and the adaptive FF approach for LLRF control in the cERL are presented in this paper.

Slides WEIDLH2066 [5.130 MB]

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THPCTH077

Summary of WG3 on Instrumentation, Controls, and Beam Losses - ERL 2015

111

C.M. Gulliford
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
T. Obina
KEK, Tsukuba, Japan

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Paper	Title	Page
MOPCTH010	Design Work of the ERL-FEL as the High Intense EUV Light Source	4
	N. Nakamura, S. Chen, T. Furuya, K. Haga, I. Hanyu, K. Harada, T. Honda, Y. Honda, E. Kako, Y. Kamiya, R. Kato, H. Kawata, Y. Kobayashi, T. Konomi, T. Kubo, S. Michizono, T. Miyajima, H. Nakai, T. Obina, K. Oide, H. Sakai, S. Sakanaka, M. Shimada, K. Tsuchiya, K. Umemori, M. Yamamoto KEK, Ibaraki, Japan R. Hajima, N. Nishimori JAEA, Ibaraki-ken, Japan
	Energy recovery linac(ERL)-based free electron lasers(FELs) are promising candidates for high-power EUV sources. They can recover most acceleration energy from the electron beams and greatly reduce the dumped beam power and activation compared with those based on ordinary linear accelerators. We have investigated a feasible design of a 10-kW class ERL-FEL operated at 13.5 nm for EUV lithography applications. In this talk, we will present the design work of the ERL-FEL as the high-power EUV source.
	Slides MOPCTH010 [4.589 MB]
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TUPATH021	WG3 ERL Instrumentation and Controls
	T. Obina KEK, Ibaraki, Japan C.M. Gulliford Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Place holder for possible Plenary Paper upload…
	Slides TUPATH021 [1.433 MB]
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TUIBLH1020	Operational Experience of DC Photoemission Gun at the Compact ERL
	N. Nishimori JAEA/FEL, Ibaraki-ken, Japan R. Hajima, R. Nagai JAEA, Ibaraki-ken, Japan Y. Honda, X.J. Jin, T. Miyajima, T. Obina, T. Uchiyama, M. Yamamoto KEK, Ibaraki, Japan M. Kuriki HU/AdSM, Higashi-Hiroshima, Japan
	Beam commissioning of the compact ERL (cERL) has been performed since Apr. 2013 for the next generation ERL light source project (PEARL), and x-ray generation via laser Compton scattering was demonstrated recently. We will present two years operational experience and future upgrade plan of the DC photoemission gun at the cERL.
	Slides TUIBLH1020 [10.603 MB]
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WEIALH2045	Non-destructive Beam Position Monitoring in Two-Beam Section of ERL
	T. Obina, R. Takai KEK, Ibaraki, Japan
	At the straight section with superconducting cavities, two beams with different energies are passing through same vacuum vessels, and separate measurements of such beams are essential for beam commissioning and tuning in energy recovery linacs. Destructive methods such as “screen monitor with a hole” are utilized in many ERLs in order to measure the recirculated beam; however, the method is not suitable for CW operation with high charge. In the compact ERL at KEK, typical macro-pulse length for beam tuning is 1000 ns. In the two-beam section, difference of arrival time of pre- and post-accelerated beam of 300 ns is long enough to separate two beams. We can measure the beam position by gating the signal from stripline electrode. The overlapped part of the two-beam signals is sensitive to the phase of two beams, and they can be utilized for path-length adjustment of the beam. The experimental results during the macro-pulse and CW operation will be presented in this paper.
	Slides WEIALH2045 [0.728 MB]
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WEIDLH2066	Performance of the Digital LLRF Systems at KEK cERL	84
	F. Qiu, D.A. Arakawa, Y. Honda, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, T. Obina, H. Sakai KEK, Ibaraki, Japan S.B. Wibowo Sokendai, Ibaraki, Japan
	A compact energy recovery linac (cERL), which is a test machine for the next generation synchrotron light source 3-GeV ERL, was constructed at KEK. In the cERL, a normal conducting (NC) buncher cavity and three superconducting (SC) two-cell cavities were installed for the injector, and two nine-cell SC cavities were installed for the main linac (ML). The radio-frequency (RF) fluctuations for each cavity are required to be maintained at less than 0.1% rms in amplitude and 0.1° in phase. These requirements are fulfilled by applying digital low-level radio-frequency (LLRF) systems. During the beam-commissioning, the LLRF systems were evaluated and validated. A measured beam momentum jitter of 0.006% shows that the target of the LLRF systems is achieved. To further improve the system performance, an adaptive feedforward (FF) control-based approach was proposed and demonstrated in the beam-commissioning. The current status of LLRF system and the adaptive FF approach for LLRF control in the cERL are presented in this paper.
	Slides WEIDLH2066 [5.130 MB]
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THPCTH077	Summary of WG3 on Instrumentation, Controls, and Beam Losses - ERL 2015	111
	C.M. Gulliford Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA T. Obina KEK, Tsukuba, Japan
	Place holder for possible Plenary Paper upload…
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