• Przygoda, K.; Rybaniec, R.; Ayvazyan, V.; Schlarb, H.; Schmidt, C.; Sekutowicz, J.; Echevarria, P.: Experience with Single Cavity and Piezo Controls for Short, Long Pulse and CW Operation. In: Gianluigi Arduini ... [Ed.] : IPAC2017 - Proceedings, Copenhagen, DenmarkJaCOW, 2017. - ISBN 978-3-95450-182-3, p. THPAB106/1-3
    http://accelconf.web.cern.ch/AccelConf/ipac2017/papers/thpab106.pdf

Open Access Version

Abstract:
We present a compact RF control system for superconducting radio frequency (SCRF) single cavities based on MicroTCA.4 equipped with specialized advanced mezzanine cards (AMCs) and rear transition modules (RTMs). To sense the RF signals from the cavity and to drive the high power source, a DRTM-DWC8VM1 module is used equipped with 8 analog field detectors and one RF vector modulator. Fast cavity frequency tuning is achieved by piezo-actuators attached to the cavity and a RTM piezo-driver module (DRTMPZT4). Data processing of the RF signals and the real-time control algorithms are implemented on a Virtex-6 and a Spartan-6 FPGAs within two AMC’s (SIS8300-L2V2 and DAMC-FMC20). The compact single cavity control system was tested at Cryo Module Test Bench (CMTB) at DESY. Software and firmware were developed to support all possible modes, the short pulse (SP), the long pulse (LP) and CW operation mode with duty cycles ranging from 1% to 100%. The SP mode used a high power multi-beam klystron at high loaded quality factor (QL) of 3 · 106. For the LP mode (up to 50% duty cycle) and the CW mode a 120 kW IOT tube was used at QL up to 1.5 · 107. Within this paper we present the achieved performance and report on the operation experience on such system.