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Title: The Two-beam accelerator

The Two-Beam Accelerator (TBA) consists of a long high-gradient accelerator structure (HGS) adjacent to an equal-length Free Electron Laser (FEL). In the FEL, a beam propagates through a long series of undulators. At regular intervals, waveguides couple microwave power out of the FEL into the HGS. To replenish energy given up by the FEL beam to the microwave field, induction accelerator units are placed periodically along the length of the FEL. In this manner it is expected to achieve gradients of more than 250 MV/m and thus have a serious option for a 1 TeV x 1 TeV linear collider. The state of present theoretical understanding of the TBA is presented with particular emphasis upon operation of the ''steady-state'' FEL, phase and amplitude control of the rf wave, and suppression of sideband instabilities. Experimental work has focused upon the development of a suitable HGS and the testing of this structure using the Electron Laser Facility (ELF). Description is given of a first test at ELF with a seven-cell 2..pi../3 mode structure which without preconditioning and with a not-very-good vacuum nevertheless at 35 GHz yielded an average accelerating gradient of 180 MV/m.
Authors:
;
Publication Date:
OSTI Identifier:
5104886
Report Number(s):
LBL-21618; CONF-860629-59
ON: DE87000315
DOE Contract Number:
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: Linear accelerator conference, Stanford, CA, USA, 2 Jun 1986; Other Information: Portions of this document are illegible in microfiche products
Research Org:
Lawrence Berkeley Lab., CA (USA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LINEAR ACCELERATORS; FREE ELECTRON LASERS; COLLIDING BEAMS; COMPUTERIZED SIMULATION; INDUCTION; MICROWAVE RADIATION; WAVEGUIDES; ACCELERATORS; BEAMS; ELECTROMAGNETIC RADIATION; LASERS; RADIATIONS; SIMULATION 430100* -- Particle Accelerators-- Design, Development, & Operation