| Paper |
Title |
Page |
| 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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| TUPOW016 |
Development of a C-Band 4/8 Mev Dual-Energy Accelerator for Cargo Inspection System |
1775 |
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- J.H. Shao, H.B. Chen, W.-H. Huang, Q.X. Jin, Y.H. Liu, J. Shi, C.-X. Tang, X.W. Wu
TUB, Beijing, People's Republic of China
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Modern cargo inspection system applies dual-energy X-ray for material discrimination. Based on the com-pact C-band 6 MeV standing-wave accelerating struc-tures developed at Tsinghua University, a compact C-band 4/8 MeV dual-energy accelerator has been pro-posed, fabricated and tested. Compared with that of the conventional S-band 3/6 MeV dual-energy accelera-tor at Tsinghua University, the volume and the weight of the C-band one has been reduced by ~40% and ~30%, respectively. Detailed review of this C-band dual-energy accelerator is present in the paper.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-TUPOW016
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| Export • |
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