Design and performance of the ALS diagnostic beamline
Synchrotron light sources have evolved from accelerators which produced this radiation as a by-product to dedicated, third generation storage rings such as the Advanced Light Source (ALS). Optimization of beam line designs to take advantage of these new sources requires information on electron beam parameters and their stability. A real-time, image of the electron beam is useful to accelerator physicists in helping their understanding of beam dynamics, monitoring of accelerator operation, and providing a means of diagnosing problems as they arise. A diagnostic beam line for these purposes has been built at the ALS to image the electron beam by focusing bend magnet radiation. Measurement of beam parameters, electron-bunch time structure and beam dynamics can now be routinely made. The image of the electron beam can be continuously monitored via standard video equipment and the size and location of the beam redundantly measured via a second detection system utilizing a slit scanned in front of a photocathode. Longitudinal electron bunch lengths can be measured with a port providing visible light to an optical platform on which a fast photodiode or a streak camera can be mounted. An additional set of diagnostic tools built into the beam line allows determination of the acceptance of the beam line and the locations of the vertical and horizontal focal planes of the system. The system also provides a discrete method of attenuating the photon flux for equalizing the signal on the video system over the wide range of expected accelerator operating conditions.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 135169
- Report Number(s):
- LBL-37638; CONF-9510119-2; ON: DE96002319; TRN: 96:000202
- Resource Relation:
- Conference: SRI `95: synchrotron radiation instrumentation symposium and the 7. users meeting for the advanced photon source (APS), Argonne, IL (United States), 16-20 Oct 1995; Other Information: PBD: Sep 1995
- Country of Publication:
- United States
- Language:
- English
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