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Digital base-band rf control system for the superconducting Darmstadt electron linear accelerator

Konrad, M. and Bonnes, U. and Burandt, C. and Eichhorn, R. and Nonn, P. and Enders, J. and Pietralla, N. (2012):
Digital base-band rf control system for the superconducting Darmstadt electron linear accelerator.
In: Physical Review Special Topics - Accelerators and Beams, American Physical Society, pp. 052802 1-11, 15, (5), [Article]

Abstract

The accelerating field in superconducting cavities has to be stabilized in amplitude and phase by a radio-frequency (rf) control system. Because of their high loaded quality factor superconducting cavities are very susceptible for microphonics. To meet the increased requirements with respect to accuracy, availability, and diagnostics, the previous analog rf control system of the superconducting Darmstadt electron linear accelerator S-DALINAC has been replaced by a digital rf control system. The new hardware consists of two components: An rf module that converts the signal from the cavity down to the base-band and a field-programmable gate array board including a soft CPU that carries out the signal processing steps of the control algorithm. Different algorithms are used for normal-conducting and superconducting cavities. To improve the availability of the control system, techniques for automatic firmware and software deployment have been implemented. Extensive diagnostic features provide the operator with additional information. The architecture of the rf control system as well as the functionality of its components will be presented along with measurements that characterize the performance of the system, yielding, e.g., an amplitude stabilization down to (ΔA/A)rms=7×10-5 and a phase stabilization of (ΔÏ•)rms=0.8° for superconducting cavities.

Item Type: Article
Erschienen: 2012
Creators: Konrad, M. and Bonnes, U. and Burandt, C. and Eichhorn, R. and Nonn, P. and Enders, J. and Pietralla, N.
Title: Digital base-band rf control system for the superconducting Darmstadt electron linear accelerator
Language: English
Abstract:

The accelerating field in superconducting cavities has to be stabilized in amplitude and phase by a radio-frequency (rf) control system. Because of their high loaded quality factor superconducting cavities are very susceptible for microphonics. To meet the increased requirements with respect to accuracy, availability, and diagnostics, the previous analog rf control system of the superconducting Darmstadt electron linear accelerator S-DALINAC has been replaced by a digital rf control system. The new hardware consists of two components: An rf module that converts the signal from the cavity down to the base-band and a field-programmable gate array board including a soft CPU that carries out the signal processing steps of the control algorithm. Different algorithms are used for normal-conducting and superconducting cavities. To improve the availability of the control system, techniques for automatic firmware and software deployment have been implemented. Extensive diagnostic features provide the operator with additional information. The architecture of the rf control system as well as the functionality of its components will be presented along with measurements that characterize the performance of the system, yielding, e.g., an amplitude stabilization down to (ΔA/A)rms=7×10-5 and a phase stabilization of (ΔÏ•)rms=0.8° for superconducting cavities.

Journal or Publication Title: Physical Review Special Topics - Accelerators and Beams
Volume: 15
Number: 5
Publisher: American Physical Society
Uncontrolled Keywords: S-DALINAC, RF Engineering, Accelerator Physics, Controls, Instrumentation, SFB634, E2
Divisions: 05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 11 Feb 2014 10:04
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