CERN Accelerating science

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Internal Note
Report number CERN-ACC-NOTE-2018-0039
Title SRF cavity testing using a FPGA Self Excited Loop
Author(s) Ben-Zvi, Ilan (Brookhaven National Laboratory (US))
Corporate author(s) CERN. Geneva. ATS Department
Imprint 28 May 2018. - 36 p.
Subject category Accelerators and Storage Rings
Technology Applied Superconductivity ; Radiofrequency
Keywords Superconducting RF ; Testing ; Self-Excited Loop ; Low Level RF
Abstract This document provides a detailed description of procedures for very-high precision calibration and testing of superconducting RF cavities using digital Low-Level RF (LLRF) electronics based on Field Programmable Gate Arrays (FPGA). The use of a Self-Excited Loop with an innovative procedure for fast turn-on allows the measurement of the forward, reflected and transmitted power from a single port of the directional coupler in front of the cavity, thus eliminating certain measurement errors. Various procedures for measuring the quality factor as a function of cavity fields are described, including a single RF pulse technique. Errors are estimated for the measurements.
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 Record created 2018-05-28, last modified 2018-05-28

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