| Paper |
Title |
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| TUPOW014 |
Simulation of High Resolution Field Emission Imaging in an rf Photocathode Gun |
1769 |
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- J.H. Shao, H.B. Chen, J. Shi, X.W. Wu
TUB, Beijing, People's Republic of China
- S.P. Antipov, C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio, USA
- W. Gai
ANL, Argonne, Illinois, USA
- F.Y. Wang
SLAC, Menlo Park, California, USA
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Precisely locating field emission (FE) emitters on a realistic surface in rf structures is technically chal-lenging in general due to the wide emitting phase and the broad energy spread. A method to achieve in situ high resolution FE imaging has been proposed by using solenoids and a collimator to select electrons emitted at certain phases. The phase selection criterion and imaging properties have been studied by the beam dynamics code ASTRA. Detailed results are presented in this paper.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-TUPOW014
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| TUPOW015 |
Experiment of High Resolution Field Emission Imaging in an rf Photocathode Gun |
1772 |
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- J.H. Shao, H.B. Chen, J. Shi, X.W. Wu
TUB, Beijing, People's Republic of China
- S.P. Antipov, S.V. Baryshev, C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio, USA
- M.E. Conde, W. Gai, G. Ha, E.E. Wisniewski
ANL, Argonne, Illinois, USA
- F.Y. Wang
SLAC, Menlo Park, California, USA
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The first in situ high resolution field emission (FE) imaging experiment has been carried out on an L-band photocathode gun test stand at Argonne Wakefield Accelerator facility (AWA). Separated strong emitters have been observed to dominate the field emission. Field enhancement factor, beta, of small regions on the cathode has been measured with the imaging system. It is shown that most strong emitters overlaps with the high beta regions. The post surface examinations reveal the origins of ~75% strong emitters overlap with the spots where rf breakdown have occurred. Detailed results are presented in this paper.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-TUPOW015
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| FRXBB01 |
Achieved Performance of an All X-band Photo-injector |
4253 |
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- C. Limborg, C. Adolphsen, M.P. Dunning, R.K. Jobe, H. Li, D.J. McCormick, T.O. Raubenheimer, T. Vecchione, A.R. Vrielink, F.Y. Wang, S.P. Weathersby
SLAC, Menlo Park, California, USA
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Funding: Work funded by DOE/SU Contract DE-AC02-76-SF00515
Building more compact accelerators to deliver high brightness electron beams for the generation of high flux, highly coherent radiation is a priority for the photon science community. A relatively straightforward reduction in footprint can be achieved by using high-gradient X-Band (11.4 GHz) RF technology. This talk presents the all X-band photo-injector facility at SLAC, covering the benefits of using this technology and highlighting the performance achieved.
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Slides FRXBB01 [40.418 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-FRXBB01
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