Photo Cathode RF Gun at KEK Electron/Positron Injector Linac

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Overview


Two-stage frequency doublers


Ir5Ce photo cathode


QTWSC cavity

A low-emittance and high-current RF gun in the injector linac is crucial in order to have a 40-times higher luminosity at the SuperKEKB collider compared with the previous KEKB project. The required injection beam parameters are; (emittance) 20 mm.mrad, (energy spread) 0.1%, (beam bunch charge) 5 nC/bunch, (bunches per pulse) 2 bunches separated by 96 ns, (pulse repetition) 50 Hz. It is preferable to generate 10 nC/bunch beam as well for positron production. It is composed of; (a) a high power laser system with an Yb fiber oscillator, multiple stages of Yb fiber amplifiers and thin-disk amplifiers, and frequency doublers, (b) an Ir5Ce or Ir7Ce2 photo cathode, and (c) a quasi-travelling-wave side-couple (QTWSC) cavity.

Please send your comments and questions to M.Yoshida or K.Furukawa.


Review/workshop

Workshop, June 10, 2016

Workshop meeting.
Date: June 10, 2016.
Place: Meeting room, 7F, 3-gokan building.
Reviewer: Matt Poelker (JLAB, Video), Katsunobu Oide, Yosuke Honda, Seiya Yamaguchi (KEK).
Preliminary presentations: Preliminary slides [powerpoint]
Meeting web: KDS Indico and Timetable
Preliminary recommendations: [pdf]
Organizer: Seiya Yamaguchi
Participants: more than 24
(Scientific secretary: Kazuro Furukawa)

Review, November 19 - 20, 2015

The second review meeting.
Date: November 19 - 20, 2015.
Place: Meeting room, 1F, 3-gokan building.
Reviewer: Tsumoru Shintake (chairperson, OIST), Matt Poelker (JLAB), Sasha Gilevich (not present, SLAC), Katsunobu Oide, Yosuke Honda (KEK).
Preliminary presentations: Preliminary slides [powerpoint]
Meeting web: KDS Indico and Timetable
Preliminary recommendations: [pdf] [powerpoint]
Organizer: Seiya Yamaguchi
Participants: more than 31
(Scientific secretary: Kazuro Furukawa)

Review, February 19 - 20, 2015

The first review meeting.
Date: February 19 - 20, 2015.
Place: Large meeting room, 1F, 2-gokan building.
Reviewer: Tsumoru Shintake (chairperson, OIST), Matt Poelker (JLAB), Sasha Gilevich (SLAC), Yosuke Honda (KEK).
Agenda: Agenda [pdf]
Preliminary presentations: Preliminary slides [powerpoint, internal]
Meeting web: KDS Indico and Timetable
Preliminary recommendations: [pdf] [powerpoint]
Organizer: Katsunobu Oide
Participants: more than 21
(Scientific secretary: Kazuro Furukawa)

Workshop, August 29, 2013

Date: August 29, 2013.
Place: Meeting room #1, 1F, 1-gokan building
 

Linac upgrade meetings

Date: October 1, 2010.
Photo cathode RF gun construction (Satoshi Ohsawa)
Cu cathode and 200nm laser (Takashi Sugimura)
LaB6 cathode and DAW cavity (Mitsuhiro Yoshida)
Disscussion [internal]
Date: August 31, 2010.
RF gun and cathode at AIST [slide, internal] (Ryunosuke Kuroda, AIST)
Date: August 24, 2010.
RF gun development status at Waseda university [slide, internal] (Kazuyuki Sakaue, Waseda univ.)


Presentations and Articles

RF gun drive Yb/Nd hybrid laser system for SuperKEKB phase III commissioning [pdf]
R. Zhang, X. Zhou, H. Kumano, N. Toyotomi, Y. Honda, M. Yoshida, Proc of PASJ2019, Kyoto, Japan, July - August 2019, pp., WEPI022.

Hybrid Yb/Nd Laser System for RF Gun in SuperKEKB Phase II and Phase III Commissioning [pdf]   [doi]  
R. Zhang, Y. Honda, M. Yoshida, X. Zhou, H. Kumano, N. Toyotomi, Proc of IPAC2019, Melbourne, Australia, May 201, pp.3663-3666, THPGW037.

The Developing of the Beam Injection Section with Laser Source and S-Band Electron Rf Gun for SuperKEKB Project [pdf]   [doi]  
X. Zhou, M. Yoshida, R. Zhang, Y. Ogawa, Proc of LINAC2018, Beijing, China, September 2018, pp.50-53, MOPO007.

Yb/Nd hybrid laser system for RF gun in SuperKEKB phase II [pdf]
R. Zhang, X. Zhou, H. Kumano, N. Toyotomi, M. Yoshida, Proc of PASJ2018, Nagaoka, Japan, August 2018, pp.763-767, THP005.

Yb/Nd Doped Hybrid Solid Laser of RF Gun and Beam Commissioning for Phase-II of SuperKEKB [pdf]   [doi]  
R. Zhang, X. Zhou, T. Natsui, Y. Ogawa, M. Yoshida, Proc of IPAC2018, Vancouver, Canada, April-May 2018, pp.2836-2839, WEPML060.

Research and development of iridium cerium photocathode for SuperKEKB injector linac [doi]
D. Satoh, T. Shibuya, N. Hayashizaki, R. Zhang, X. Zhou, T. Natsui, M. Yoshida, Energy Procedia 131, 2017, pp.326-333.

Cut disk structure type RF-deflector for slice emittance measurement for RF-gun at SuperKEKB [doi]
A. Inoue, T. Natsui, M. Yoshida, Energy Procedia 131, 2017, pp.334-341.

New Achievements of the Laser System for RF-Gun at SuperKEKB Injector [jacow]   [doi]  
R. Zhang, X. Zhou, T. Natsui, Y. Ogawa, M. Yoshida, Proc of IPAC2017, Copenhagen, Denmark, May 2017, pp.1452-1455, TUPAB056.

Developing an Yb/Nd Doped Hybrid Solid Laser of RF Gun for SuperKEKB Phase II Commissioning [pdf]   [doi]  
X. Zhou, T. Natsui, M. Yoshida, R. Zhang, Y. Ogawa, Proc of IPAC2017, Copenhagen, Denmark, May 2017, pp.4540-4543, THPVA047.

Injector Linac Upgrade and New RF Gun Development for SuperKEKB [jacow-pdf]   [slide]   [doi]  
T. Natsui, D. Satoh, M. Yoshida, R. Zhang, X. Zhou, Proc of eeFACT2016, Daresbury, UK, October 2016, pp.74-78, TUT2H2.

Neodymium and Ytterbium Hybrid Solid Laser of RF Gun for SuperKEKB [jacow]
X. Zhou, T. Natsui, M. Yoshida, R. Zhang, Y. Ogawa, T. Shibuya, Proc of IPAC2016, Busan, Korea, May 2016, pp.3748-3750, THPMY041.

Improvements of the Laser System for RF-Gun at SuperKEKB Injector [pdf]
R. Zhang, X. Zhou, T. Natsui, M. Yoshida, Y. Ogawa, Proc of PASJ2015, Tsuruga, Japan, August 2015, WEP121.

Improvements of the Laser System for RF-Gun at SuperKEKB Injector [pdf]
R. Zhang, M. Yoshida, T. Natsui, X. Zhou, Y. Ogawa, Proc of IPAC2015, Richmond, Virginia, USA, May 2015, pp.1598-1600, TUPWA071.

Quasi-Traveling Wave RF Gun and Beam Commissioning for SuperKEKB [pdf]
T. Natsui, M. Yoshida, X. Zhou, Y. Ogawa, Proc of IPAC2015, Richmond, Virginia, USA, May 2015, pp.1610-1612, TUPJE003.

25 Hz, Sub-mJ Ytterbium Laser Source of RF Gun for SuperKEKB Linac [pdf]
X. Zhou, T. Natsui, M. Yoshida, R. Zhang, Y. Ogawa, Proc of IPAC2015, Richmond, Virginia, USA, May 2015, pp.2862-2864, WEPMA044.

Overview of SuperKEKB injector linac and rf gun [slide]
K. Furukawa, M. Yoshida, December 2014.

Generation and Acceleration of Low-emittance, High-current Electron Beams for SuperKEKB [pdf],   [slide]
M. Yoshida, N. Iida, S. Kazama, T. Natsui, Y. Ogawa, S. Ohsawa, H. Sugimoto, L. Zang, X. Zhou, D. Sato, Proc of LINAC2014, Geneva, Switzerland, September 2014, MOIOB03.

Quasi-traveling Wave Side Couple RF Gun Commissioning for SuperKEKB [pdf]
T. Natsui, Y. Ogawa, M. Yoshida, X. Zhou, Proc of IPAC2014, Dresden, Germany, June 2014, pp.667-669, MOPRI033.

Development of Iridium Cerium Cathode Material for High Charge and High Current Electron Source [jacow]
D. Satoh, T. Natsui, M. Yoshida, N. Hayashizaki, Proc of IPAC2014, Dresden, Germany, June 2014, pp.679-681, MOPRI037.

Ytterbium Fiber and Disk Laser of RF Gun for SuperKEKB [pdf]
X. Zhou, T. Natsui, Y. Ogawa, M. Yoshida, Proc of IPAC2014, Dresden, Germany, June 2014, pp.2415-2417, WEPME061.

RF Gun and Emittance Preservation [pdf]
M. Yoshida, KEKB MAC Review, March 2014.

Quasi Traveling Wave Side Couple RF Gun for SuperKEKB [pdf],   [slide]
T. Natsui, M. Yoshida, X. Zhou, Y. Ogawa, Proc of IPAC2013, Shanghai, China, May 2013, pp.1117-1119, TUOCB103.

Development of Better Quantum Efficiency and Long Lifetime IrCe Photocathode for High Charge electron RF Gun [jacow]
D. Satoh, N. Hayashizaki, M. Yoshida, Proc of IPAC2013, Shanghai, China, May 2013, pp.327-329, MOPFI023.

Longitudinal Manipulation to Obtain and Keep the Low Emittance and High Charge Electron Beam for SuperKEKB Injector [pdf]
M. Yoshida, N. Iida, T. Natsui, Y. Ogawa, S. Ohsawa, H. Sugimoto, L. Zang, X. Zhou, Proc of IPAC2013, Shanghai, China, May 2013, pp.1337-1339, TUPFI004.

Ytterbium Laser Development of DAW RF Gun for SuperKEKB [pdf]
X. Zhou, T. Natsui, M. Yoshida, Y. Ogawa, Proc of IPAC2013, Shanghai, China, May 2013, pp.2965-2967, WEPME018.

RF Gun [pdf]
M. Yoshida, KEKB MAC Review, March 2013.

SuperKEKB Injector Upgrade for High Charge and Low Emittance Electron Beam [pdf],   [poster]
M. Yoshida, N. Iida, T. Natsui, M. Satoh, Y. Ogawa, L. Zang, Proc of IPAC2012, New Orleans, USA, May 2012, pp.1482-1484, TUPPD035.

High Charge Low Emittance RF Gun for SuperKEKB [pdf],   [poster]
T. Natsui, M. Yoshida, X. Zhou, Y. Ogawa, Proc of IPAC2012, New Orleans, USA, May 2012, pp.1533-1535, TUPPD057.

Ytterbium Fiber Laser System of DAW RF Gun for SuperKEKB [pdf]
X. Zhou, T. Natsui, M. Yoshida, Y. Ogawa, Proc of IPAC2012, New Orleans, USA, May 2012, pp.2648-2650, WEPPD056.

KEKB Linac Wakefield Studies of Comparing Theoretical Calculation, Simulation and Experimental Measurement [pdf]
L. Zang, N. Iida, Y. Ogawa, M. Satoh, M. Yoshida, D.M. Zhou, Proc of IPAC2011, San Sebastian, Spain, September 2011, pp.739-741, MOPS058.


Japanese Articles

Upgrade of electron beam generation system for Phase-III commissioning of SuperKEKB project [pdf]
X. Zhou, R. Zhang, M. Yoshida, Y. Honda, Y. Ogawa, Proc of PASJ2019, Kyoto, Japan, July - August 2019, pp., WEPI023.

Commissioning of RF-Gun for SuperKEKB [pdf]
M. Yoshida, X. Zhou, R. Zhang, M. Nishida, T. Natsui, D. Sato, Proc of PASJ2018, Nagaoka, Japan, August 2018, pp.200-203, FROM06.

Phase-II Commissioning of RF Gun for SuperKEKB [pdf]
X. Zhou, R. Zhang, M. Yoshida, Y. Ogawa, Proc of PASJ2018, Nagaoka, Japan, August 2018, pp.294-297, WEP006.

Commissioning of RF gun for SuperKEKB [pdf]
T. Natsui, M. Yoshida, X. Zhou, R. Zhang, Y. Ogawa, Proc of PASJ2015, Tsuruga, Japan, August 2015, WEP006.

25Hz and 50Hz double-bunch laser system upgrade for RF gun at SuperKEKB [pdf]
X. Zhou, T. Natsui, R. Zhang, M. Yoshida, Y. Ogawa, Proc of PASJ2015, Tsuruga, Japan, August 2015, THP115.

Laser system upgrade for RF gun at SuperKEKB [pdf]
X. Zhou, T. Natsui, M. Yoshida, Y. Ogawa, Proc of PASJ2014, Aomori, Japan, August 2014, SAP114.

Commissioning of High-Charge, Low-Emittance, RF Gun for SuperKEKB [pdf]
T. Natsui, M. Yoshida, X. Zhou, Y. Ogawa, Proc of PASJ2014, Aomori, Japan, August 2014, SUP004.

Development of new photocathode materials and its quantum efficiency improvement for high brightness electron gun [pdf]
D. Satoh, M. Yoshida, N. Hayashizaki, T. Natsui, I. Tanaka, Proc of PASJ2013, Nagoya, Japan, August 2013, pp.540-543, SAP044.

Yb hybrid laser system of DAW RF gun for SuperKEKB [pdf]
X. Zhou, T. Natsui, M. Yoshida, Y. Ogawa, Proc of PASJ2013, Nagoya, Japan, August 2013, pp.765-768, SAP106.

Temporal manipulation of low emittance and high charge electron beam for SuperKEKB injection [pdf]
M. Yoshida, T. Natsui, X. Zhou, Y. Ogawa, H. Sugimoto, N. Iida, L. Zang, M. Satoh, Proc of PASJ2013, Nagoya, Japan, August 2013, pp.834-836, SUP009.


Charge History

Recent charge history of the RF-gun


Links

Progress of injector linac, January 2015 [slide] (partly in Japanese)

Injector linac conference papers

KEKB machine advisory committee review, 1995-2019
KEKB machine advisory committee review, 2019
KEKB machine advisory committee review, 2018
KEKB machine advisory committee review, 2016
KEKB machine advisory committee review, 2015
KEKB machine advisory committee review, 2014

B factory project steering committee, -2015 (partly in Japanese)


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Kazuro Furukawa <kazuro.furukawa AT kek.jp>, Jan.16.2015 - Jan.13.2020.
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