Chromaticity Tracking Using a Phase Modulation Technique.

Tan, C. Y.

Technical Information Center Oak Ridge Tennessee

关键词: Chromaticity;    Betatron oscillations;    RF systems;    Fermilab tevatron;   

RP-ID  :  DE2007917092

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

In the classical chromaticity measurement technique, chromaticity is measured by measuring the change in betatron tune as the RF frequency is varied. This paper will describe a novel way of measuring chromaticity: we will phase modulate the RF with a known sine wave and then phase demodulate the betatron frequency. The result is a line in Fourier space which corresponds to the frequency of our sine wave modulation. The peak of this sine wave is proportional to chromaticity. For this technique to work, a tune tracker PLL system is required because it supplies the betatron carrier frequency. This method has been tested in the Tevatron and we will show the results here.