Advanced light source storage ring rf system
The short electron bunch length (30ps design target) of the Advanced Light Source (ALS) stored beam is capable exciting a wide spectrum of higher order mode (HOM) frequencies. Further, the small aperture and low cut off frequency of the beam enveloping components does not allow for transmission and consequent attenuation of the lower frequency HOM components. The small cross section and divergence of the high brightness electron beam will allow for more sophisticated high resolution experiments by synchrotron radiation users. A more stringent requirement on beam position stability results, however. In this area transmitted mechanical vibration becomes a problem. The ALS RF system splits 300kW of CW 500MHz power between two single cell cavities. Compared to past practice this power rating is high. The use of only two cavities however has some advantages, it simplifies the waveguide feed system and releases room in straight sections for insertion devices, more important it reduces HOM and beam impedance problems. 3 refs., 2 figs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5885277
- Report Number(s):
- LBL-25978; CONF-890335-242; ON: DE89016349
- Resource Relation:
- Conference: 13. particle accelerator conference, Chicago, IL, USA, 20-23 Mar 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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