| Title |
Maximizing 2-D Beam Brightness Using the Round to Flat Beam Transformation in the Ultralow Charge Regime |
| Authors |
- F.W. Cropp V, P.E. Denham, J. Giner Navarro, E.T. Liu, P. Musumeci
UCLA, Los Angeles, USA
- N. Burger, L. Phillips
PBPL, Los Angeles, USA
- A.L. Edelen, C. Emma
SLAC, Menlo Park, California, USA
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| Abstract |
We seek to maximize the 2-D beam brightness in an RF photoinjector operating in an ultralow charge (<1 pC) regime by implementing the FBT. Particle tracking simulations suggest that in one dimension, normalized projected emittances smaller than 5 nm can be obtained at the UCLA Pegasus facility with up to 100 fC beam charge. A tunable magnetic field is put on the cathode. Three skew quadrupoles are used to block-diagonalize the beam matrix and recover the vastly different eigenemittances as the projected emittances. Emittance measurement routines, including grid-based, pepperpot-based and quad scan routines, have been developed for on-line calculation of the 4-D beam matrix and its eigenemittances. Preliminary measurements are in agreement with simulations and indicate emittance ratios larger than 10 depending on the laser spot size on the cathode. Fine tuning the quadrupole gradients for the FBT has a significant effect on the 2-D beam brightness. We have made concrete steps toward computer minimization and machine learning optimization of the quadrupole gradients in order to remove the canonical angular momentum from the beam and achieve the target normalized projected emittances.
|
| Funding |
This work is supported by the United States National Science Foundation award PHY-1549132 (the Center for Bright Beams) |
| Paper |
download FRXBA4.PDF [0.649 MB / 4 pages] |
| Slides |
download FRXBA4_TALK.PDF [3.059 MB] |
| Export |
download ※ BibTeX
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※ EndNote |
| Conference |
NAPAC2019 |
| Series |
North American Particle Accelerator Conference (4th) |
| Location |
Lansing, MI, USA |
| Date |
01-06 September 2019 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Yoshishige Yamazaki (MSU, East-Lansing, MI, USA); Tor Raubenheimer (SLAC, Stanford, CA, USA); Amy McCausey (FRIB, East-Lansing, MI, USA); Volker RW Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-223-3 |
| Online ISSN |
2673-7000 |
| Received |
28 August 2019 |
| Accepted |
05 December 2019 |
| Issue Date |
08 October 2019 |
| DOI |
doi:10.18429/JACoW-NAPAC2019-FRXBA4 |
| Pages |
986-989 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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