Photo Cathode RF Gun at KEK Electron/Positron Injector Linac

[Overview]   [Review]   [Presentations&Articles]   [Japanese Articles]   [Links]  


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 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

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

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.


Links

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

Injector linac conference papers

KEKB machine advisory committee review, 1995-2016
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 - Jun.28.2016.
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