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Title: INITIAL OPERATION OF THE LEDA BEAM-INDUCED FLUORESCENCE DIAGNOSTIC

A diagnostic based on beam-induced fluorescence has been developed and used to examine the expanded beam in the High-Energy Beam Transport (HEBT) section of the Low Energy Demonstration Accelerator (LEDA). The system consists of a camera, a gas injector, a spectrometer, and a control system. Gas is injected to provide a medium for the beam to excite, the camera captures the resulting image of the fluorescing gas, and the spectrometer measures the spectrum of the emitted light. EPICS was used to control the camera and acquire and store images. Data analysis is presently being performed offline. A Kodak DCS420m professional CCD camera is the primary component of the optical system. InterScience, Inc. modified the camera with the addition of a gain of 4000 image intensifier, thereby producing an intensified camera with a sensitivity of {approximately}0.5 milli-lux. Light is gathered with a 1 inch format, 16-160 mm, Computar zoom lens. This lens is attached to the camera via a Century Precision Optics relay lens. Images obtained using only hydrogen from the beam stop exhibited features not yet understood. Images with good signal-to-noise ratio were obtained with the injection of sufficient nitrogen to raise the HEBT pressure to 2-8x10{sup {minus}6} torr. Twomore » strong nitrogen lines, believed to be of the first negative group of N{sub 2}{sup +}, were identified at 391 and 428 nm.« less
Authors:
;
Publication Date:
OSTI Identifier:
769065
Report Number(s):
LA-UR-00-2361
TRN: US0102825
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Jun 2000
Research Org:
Los Alamos National Lab., NM (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATOR FACILITIES; BEAM TRANSPORT; CAMERAS; CONTROL SYSTEMS; DATA ANALYSIS; FLUORESCENCE; IMAGE INTENSIFIERS; OPTICAL SYSTEMS; SIGNAL-TO-NOISE RATIO; SPECTROMETERS