Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasers

The parallel operation of plural undulator beam lines is an important means of improving the efficiency and usability of x-ray free-electron laser facilities. After the installation of a second undulator beam line (BL2) at SPring-8 Angstrom compact free-electron laser (SACLA), pulse-by-pulse switchi...

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Main Authors: Toru Hara, Kenji Fukami, Takahiro Inagaki, Hideaki Kawaguchi, Ryota Kinjo, Chikara Kondo, Yuji Otake, Yasuyuki Tajiri, Hideki Takebe, Kazuaki Togawa, Tatsuya Yoshino, Hitoshi Tanaka, Tetsuya Ishikawa
Format: Article
Language:English
Published: American Physical Society 2016-02-01
Series:Physical Review Accelerators and Beams
Online Access:http://doi.org/10.1103/PhysRevAccelBeams.19.020703
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author Toru Hara
Kenji Fukami
Takahiro Inagaki
Hideaki Kawaguchi
Ryota Kinjo
Chikara Kondo
Yuji Otake
Yasuyuki Tajiri
Hideki Takebe
Kazuaki Togawa
Tatsuya Yoshino
Hitoshi Tanaka
Tetsuya Ishikawa
author_facet Toru Hara
Kenji Fukami
Takahiro Inagaki
Hideaki Kawaguchi
Ryota Kinjo
Chikara Kondo
Yuji Otake
Yasuyuki Tajiri
Hideki Takebe
Kazuaki Togawa
Tatsuya Yoshino
Hitoshi Tanaka
Tetsuya Ishikawa
author_sort Toru Hara
collection DOAJ
description The parallel operation of plural undulator beam lines is an important means of improving the efficiency and usability of x-ray free-electron laser facilities. After the installation of a second undulator beam line (BL2) at SPring-8 Angstrom compact free-electron laser (SACLA), pulse-by-pulse switching between two beam lines was tested using kicker and dc twin-septum magnets. To maintain a compact size, all undulator beam lines at SACLA are designed to be placed within the same undulator hall located downstream of the accelerator. In order to ensure broad tunability of the laser wavelength, the electron bunches are accelerated to different beam energies optimized for the wavelengths of each beam line. In the demonstration, the 30 Hz electron beam was alternately deflected to two beam lines and simultaneous lasing was achieved with 15 Hz at each beam line. Since the electron beam was deflected twice by 3° in a dogleg to BL2, the coherent synchrotron radiation (CSR) effects became non-negligible. Currently in a wavelength range of 4–10 keV, a laser pulse energy of 100–150  μJ can be obtained with a reduced peak current of around 1 kA by alleviating the CSR effects. This paper reports the results and operational issues related to the multi-beam-line operation of SACLA.
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spelling doaj.art-657fed8d5ab4456cad9d2af748c096962022-12-21T19:06:32ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882016-02-0119202070310.1103/PhysRevAccelBeams.19.020703Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasersToru HaraKenji FukamiTakahiro InagakiHideaki KawaguchiRyota KinjoChikara KondoYuji OtakeYasuyuki TajiriHideki TakebeKazuaki TogawaTatsuya YoshinoHitoshi TanakaTetsuya IshikawaThe parallel operation of plural undulator beam lines is an important means of improving the efficiency and usability of x-ray free-electron laser facilities. After the installation of a second undulator beam line (BL2) at SPring-8 Angstrom compact free-electron laser (SACLA), pulse-by-pulse switching between two beam lines was tested using kicker and dc twin-septum magnets. To maintain a compact size, all undulator beam lines at SACLA are designed to be placed within the same undulator hall located downstream of the accelerator. In order to ensure broad tunability of the laser wavelength, the electron bunches are accelerated to different beam energies optimized for the wavelengths of each beam line. In the demonstration, the 30 Hz electron beam was alternately deflected to two beam lines and simultaneous lasing was achieved with 15 Hz at each beam line. Since the electron beam was deflected twice by 3° in a dogleg to BL2, the coherent synchrotron radiation (CSR) effects became non-negligible. Currently in a wavelength range of 4–10 keV, a laser pulse energy of 100–150  μJ can be obtained with a reduced peak current of around 1 kA by alleviating the CSR effects. This paper reports the results and operational issues related to the multi-beam-line operation of SACLA.http://doi.org/10.1103/PhysRevAccelBeams.19.020703
spellingShingle Toru Hara
Kenji Fukami
Takahiro Inagaki
Hideaki Kawaguchi
Ryota Kinjo
Chikara Kondo
Yuji Otake
Yasuyuki Tajiri
Hideki Takebe
Kazuaki Togawa
Tatsuya Yoshino
Hitoshi Tanaka
Tetsuya Ishikawa
Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasers
Physical Review Accelerators and Beams
title Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasers
title_full Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasers
title_fullStr Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasers
title_full_unstemmed Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasers
title_short Pulse-by-pulse multi-beam-line operation for x-ray free-electron lasers
title_sort pulse by pulse multi beam line operation for x ray free electron lasers
url http://doi.org/10.1103/PhysRevAccelBeams.19.020703
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