MOOAB1
LANL, Los Alamos, New Mexico, USA
The MaRIE 1.0 X-FEL requires an electron beam at 12 GeV with 100pC bunch charge, 0.2 μm RMS normalized transverse emittance, and 0.15% RMS slice energy spread. These requirements place significant constraints upon the use of techniques, such as laser heaters, which have enabled other X-FELs to reach their design goals. In this paper, we present the current baseline design and performance of the MaRIE 1.0 linac, highlight current and anticipated challenges and describe potential alternate approaches for meeting our design performance goals.
CSU, Fort Collins, Colorado, USA
LANL, Los Alamos, New Mexico, USA
This paper discusses work done on designing a Radio Frequency, thermionic cathode electron gun for high current injection systems. The background and previous work on the subject is overviewed as well as an introduction to other facilities operating thermionic cathodes and their particular configuration. We discuss using a two frequency TM010 electron gun at the Colorado State University accelerator facility and we discuss theory and simulation of exotic mode electron guns. Results are compared using both PARMELA and SPIFFE and for high current electron beams we have simulated CW operation with very-low back-bombardment levels.
CSU, Fort Collins, Colorado, USA
NPS, Monterey, California, USA
LANL, Los Alamos, New Mexico, USA
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
Photocathodes remain the principal electron sources for many particle accelerators. With the increasing interest in the use of superconducting radiofrequency electron guns, it is important to understand how operation at cryogenic temperatures affects the performance of photocathodes. Here we report measurements of the quantum efficiency of copper and niobium under illumination with 266 nm light at temperatures between 85K and 400K. The quantum efficiency of copper was found to vary strongly over this range, while there was only a minimal change in the quantum efficiency of niobium.