Title :
Tune trackers for the Fermilab Tevatron
Author :
Fitzgerald, Jeannie ; Gonzalez, R.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
A system for continuous real time measurement of betatron tune has been developed and installed for the Fermilab Tevatron and Accumulator ring. The efforts to overcome some application problems and optimize the performance of a phase-locked loop system are discussed. A phase-locked loop, using a considerable amount of input signal preconditioning, is used to lock to a betatron oscillation harmonic in the Schottky detector output signal. This system has demonstrated the capability of measuring the Tevatron fractional tune to an accuracy of +or-0.002 at 100 Hz bandwidth. The desired tune spectrum line has a very low signal to noise ratio, undesired revolution frequency harmonics, frequency modulation with wide deviations, and amplitude modulation with levels to 100%.<>
Keywords :
particle beam diagnostics; proton accelerators; synchrotrons; Accumulator ring; Fermilab Tevatron; Schottky detector output signal; Tevatron fractional tune; amplitude modulation; betatron oscillation harmonic; betatron tune; frequency modulation; input signal preconditioning; particle beam diagnostics; phase-locked loop system; revolution frequency harmonics; tune spectrum line; Amplitude modulation; Bandwidth; Detectors; Frequency measurement; Frequency modulation; Laboratories; Phase locked loops; Real time systems; Signal to noise ratio; Tuned circuits;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164597
