Development Diagnostics for the Next Generation RF*
Abstract
Development of the next generation of high power RF sources and accelerating cavities for Linear Colliders implies real-time monitoring and control of the power and its effects on surface characteristics. Existing test systems at SLAC and elsewhere are discussed together with what one needs to measure and control during the different phases of fabrication and testing based on observations made under differing but `controlled' conditions at lower frequencies. Current systems do not measure any surface characteristics in situ such as temperature, structure or trace elements either before, during or after RF operation. Any subsequent diagnosis often involves destructive testing that is time consuming and provides only qualitative insight on any surface changes (damage) that are observed and their underlying causes. Examples are discussed together with methods for observing their development in real time e.g. we discuss how IR surface spectra can be taken and used to resolve local temperature variations over single RF pulses. Lasers can be used for calibration and to study the surface structure and contaminant layers over time as well as to study dark current for certain restricted locations and conditions. \overline Funded by U.S. Dept. of Energy under contract DE-AC03-76SF00515.
- Publication:
-
APS Meeting Abstracts
- Pub Date:
- May 1997
- Bibcode:
- 1997APS..PAC..7P55F