Speaker
Description
The recently-commissioned Linac to End Station A (LESA) beamline was designed to deliver high-energy electrons to experiments in End Station A, such as the Light Dark Matter eXperiment (LDMX). Since LDMX requires single electrons at a high repetition rate, dark current from the 186 MHz LCLS-II electron gun provides a convenient low-current source that can be extracted parasitically from the beam switchyard (BSY). However, the orbit and phase space distribution of the dark current differ from those of the main photocurrent beam. Furthermore, the quantity and behavior of the transmitted dark current change substantially each time the cathode is changed, as well as with machine tuning changes upstream. Due to these factors, it is useful to have an efficient method of reestablishing the orbit of the dark current in LESA in response to these changes. Since the dark current is too low to observe with the LESA BPMs (often only a few electrons per RF bucket), we must use a more limited set of diagnostics to characterize its orbit near the BSY and establish its transport to ESA.
Funding Agency
Work supported by the U.S. Department of Energy under Contract No. DE-AC02-76SF00515.
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