| Title |
Construction Status of a RF-Injector with a CNT-Tip Cathode for High Brightness Field-Emission Tests |
| Authors |
- Y.-M. Shin, G. Fagerberg, M. Figora
Northern Illinois University, DeKalb, Illinois, USA
- A.T. Green
Northern Illinois Univerity, DeKalb, Illinois, USA
|
| Abstract |
We have been constructing a S-band RF-injector system for field-emission tests of a CNT-tip cathode. A pulsed Sband klystron is installed and fully commissioned with 5.5 MW peak power in a 2.5 microsecond pulse length and 1 Hz repetition rate. A single-cell RFgun is designed to produce with 0.5 - 1 pC electron bunches in a photo-emission mode within a 50 fs - 3 ps at 0.5- 1 MeV. The measured RF system jitters are within 1 % in magnitude and 0.2° in phase, which would induce 3.4 keV and 0.25 keV of energy jitters, corresponding to 80 fs and 5 fs of temporal jitters, respectively. Our PIC simulations indicate that the designed bunch compressor reduces the TOAjitter by about an order of magnitude. Emission current and beam brightness of the field-emitted beam are improved by implanting CNT tips on the cathode surface, since they reduce the emission area, while providing high current emission. Once the system is completely commissioned in field-emission mode, the CNT-tip cathode will be tested in terms of klystron-power levels to map out its I-V characteristics under pulse emission condition.
|
| Paper |
download WEPOA40.PDF [0.826 MB / 4 pages] |
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| Conference |
NAPAC2016, Chicago, IL, USA |
| Series |
North American Particle Accelerator Conference (3rd) |
| Proceedings |
Link to full NAPAC2016 Proccedings |
| Session |
Poster Session (MC3 & MC4) |
| Date |
12-Oct-16 08:30–12:30 |
| Main Classification |
3: Advanced Acceleration Techniques and Alternative Particle Sources |
| Sub Classification |
T02 - Electron Sources |
| Keywords |
ion, cathode, electron, gun, emittance |
| Publisher |
JACoW, Geneva, Switzerland |
| Editors |
Volker RW Schaa (GSI, Darmstadt, Germany); Maria Power (ANL, Argonne, IL, USA); Vladimir Shiltsev (FNAL, Batavia, IL, USA); Marion White (ANL, Argonne, IL, USA) |
| ISBN |
978-3-95450-180-9 |
| Published |
January 2017 |
| Copyright |
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