Ultra-High Gradient Dielectric Wakefield Accelerator Experiments
Ultra-high gradient dielectric wakefield accelerators are a potential option for a linear collider afterburner since they are immune to the ion collapse and electron/positron asymmetry problems implicit in a plasma based afterburner. The first phase of an experiment to study the performance of dielectric Cerenkov wakefield accelerating structures at extremely high gradients in the GV/m range has been completed. The experiment took advantage of the unique SLAC FFTB electron beam and its ultra-short pulse lengths and high currents (e.g., {sigma}{sub z} = 20 {micro}m at Q = 3 nC). The FFTB electron beam was successfully focused down and sent through short lengths of fused silica capillary tubing (ID = 200 {micro}m/OD = 325 {micro}m). The pulse length of the electron beam was varied to produce a range of electric fields between 2 and 20 GV/m at the inner surface of the dielectric tubes. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the surfaced fields that were sustained equate to on axis accelerating field of several GV/m. In future experiments being developed for the SLAC SABER and BNL ATF we plan to use the coherent Cerenkov radiation emitted from the capillary tube as a field strength diagnostic and demonstrate GV/m range particle energy gain.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 894768
- Report Number(s):
- UCRL-CONF-223510; TRN: US0700309
- Resource Relation:
- Journal Volume: 877; Conference: Presented at: Advanced Accelerator Concepts Workshop 2006, Lake Geneva, WI, United States, Jul 10 - Jul 15, 2006
- Country of Publication:
- United States
- Language:
- English
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Ultra-High Gradient Dielectric Wakefield Accelerator Experiments
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Related Subjects
36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCELERATORS
AFTERBURNERS
ASYMMETRY
BNL
BREAKDOWN
CAPILLARIES
DIELECTRIC MATERIALS
ELECTRIC FIELDS
ELECTRON BEAMS
LINEAR COLLIDERS
RADIATIONS
SILICA
STANFORD LINEAR ACCELERATOR CENTER
WAKEFIELD ACCELERATORS