Dielectric Wakefield Accelerating Structure as a Source of Terahertz Coherent Cerenkov Radiation

Journal Article · Mon Nov 27 00:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2409222· OSTI ID:20898762

Cook, A M; Rosenzweig, J B; Badakov, H; Travish, G; Tikhoplav, R; Williams, O B; England, R J ^[1]; Thompson, M C ^[2]

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1. UCLA Department of Physics and Astronomy, Los Angeles, CA 90095 (United States)
2. Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States)

We discuss future experimental work proposed to study the performance of a cylindrical dielectric wakefield accelerating structure as a coherent Cerenkov radiation source at the Neptune laboratory at UCLA. The Cerenkov wakefield acceleration experiment carried out recently by UCLA/SLAC/USC, using the ultrashort and high charge beam (Q = 3 nC, {sigma}z = 20 micron) at the SLAC FFTB, demonstrated electromagnetic wakes at the few GV/m level. The motivation of our prospective experiment is to investigate the operation of a similar scenario using the comparatively long pulse, low charge beam (Q = 0.5 nC, {sigma}z = 200 micron) at UCLA Neptune. The field amplitude produced in this setup would be one to two orders of magnitude lower, at the few tens to few 100 MV/m level. Such a decelerating field would extract a significant amount of energy from a low-energy beam in a distance on the order of a few centimeters, allowing the use of short dielectric structures. We discuss details of the geometry and composition of the structures to be used in the experiment. We also examine the possibility of a future dedicated facility at UCLA Neptune based on a hybrid photoinjector currently in development. The intrinsic bunch compression capabilities and improved beam parameters ({sigma}z = 100 micron, Q = 1 nC) of the photoinjector would allow the creation of a high power radiation source in the terahertz regime.

• OSTI ID: 20898762
• Journal Information: AIP Conference Proceedings, Vol. 877, Issue 1; Conference: 12. advanced accelerator concepts workshop, Lake Geneva, WI (United States), 10-15 Jul 2006; Other Information: DOI: 10.1063/1.2409222; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATION
CHERENKOV RADIATION
CYLINDRICAL CONFIGURATION
DIELECTRIC MATERIALS
GEOMETRY
OPERATION
PERFORMANCE
PULSES
RADIATION SOURCES
STANFORD LINEAR ACCELERATOR CENTER
THZ RANGE 01-100
UCLA
WAKEFIELD ACCELERATORS
WAVEGUIDES