| Title |
Multi-photon Photoemission and Ultrafast Electron Heating in Cu Photocathodes at Threshold |
| Authors |
- J. Bae, L. Cultrera
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
- I.V. Bazarov, J.M. Maxson
Cornell University, Ithaca, New York, USA
- S.S. Karkare, H.A. Padmore
LBNL, Berkeley, California, USA
- P. Musumeci, X.L. Shen
UCLA, Los Angeles, California, USA
|
| Abstract |
Operating photocathodes near the photoemission threshold holds the promise of yielding small intrinsic emittance, at the cost of significantly reduced quantum efficiency. In modern femtosecond photoemission electron sources, this requires a very high intensity (10s of GW/cm²) to extract a useful quantity of electrons. At this intensity, the electron occupation function is far from equilibrium and evolves rapidly on sub-ps timescales. Thus, ultrafast laser heating and multiphoton photoemission effects may play a significant role in emission, thereby increasing the minimum achievable emittance. In this work, we use a Boltzmann equation approach to calculate the non-equilibrium occupation function evolution in time for a copper photocathode, yielding a prediction of quantum efficiency and mean transverse energy as a function of input intensity.
|
| Funding |
U.S. National Science Foundation under award PHY-1549132, the Center for Bright Beams. |
| Paper |
download TUPML026.PDF [0.184 MB / 4 pages] |
| Export |
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| Conference |
IPAC2018, Vancouver, BC, Canada |
| Series |
International Particle Accelerator Conference (9th) |
| Proceedings |
Link to full IPAC2018 Proccedings |
| Session |
MC3 Poster Session |
| Date |
01-May-18 16:00–17:30 |
| Main Classification |
03 Novel Particle Sources and Acceleration Technologies |
| Sub Classification |
T02 Electron Sources |
| Keywords |
electron, photon, cathode, laser, radiation |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Shane Koscielniak (TRIUMF, Vancouver, BC, Canada); Todd Satogata (JLab, Newport News, VA, USA); Volker RW Schaa (GSI, Darmstadt, Germany); Jana Thomson (TRIUMF, Vancouver, BC, Canada) |
| ISBN |
978-3-95450-184-7 |
| Published |
June 2018 |
| Copyright |
|
