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Title: Note: Electronic damping of microphonics in superconducting resonators of a continuous wave linac

The paper presents an implementation technique to damp the microphonics in superconducting resonators utilizing the coupling between the electromagnetic and the mechanical modes of a resonator. In the technique used the resonant frequency variations are fed back to modulate the field amplitude through a suitable transfer function. Of the two transfer functions used in the experiments, one emulates a derivative action and is placed in a negative feedback configuration. The other transfer function is essentially a parallel combination of second order low pass filters and is used in a positive feedback configuration. Experiments with the Quarter Wave resonators of IUAC, New Delhi linac demonstrate that the damping of some of the modes increases significantly with the introduction of this feedback leading to a reduction in power required for field stabilization and quieter operation of the RF control system.
Authors:
 [1] ;  [2] ; ;  [3]
  1. BARC, Mumbai 400085 (India)
  2. IUAC, New Delhi 110067 (India)
  3. IITB, Mumbai 400076 (India)
Publication Date:
OSTI Identifier:
22253536
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; AMPLITUDES; CONFIGURATION; CONTROL SYSTEMS; COUPLING; DAMPING; FILTERS; LINEAR ACCELERATORS; RESONATORS; SUPERCONDUCTING DEVICES; TRANSFER FUNCTIONS