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Title: Dynamic PID loop control

The Horizontal Test Stand (HTS) SRF Cavity and Cryomodule 1 (CM1) of eight 9-cell, 1.3GHz SRF cavities are operating at Fermilab. For the cryogenic control system, how to hold liquid level constant in the cryostat by regulation of its Joule-Thompson JT-valve is very important after cryostat cool down to 2.0 K. The 72-cell cryostat liquid level response generally takes a long time delay after regulating its JT-valve; therefore, typical PID control loop should result in some cryostat parameter oscillations. This paper presents a type of PID parameter self-optimal and Time-Delay control method used to reduce cryogenic system parameters oscillation.
Authors:
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Publication Date:
OSTI Identifier:
1022777
Report Number(s):
FERMILAB-CONF-11-247-AD
TRN: US1104143
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: Presented at Cryogenic Engineering Conference and International Cryogenic Materials Conference CEC-ICMC 2011, Spokane, Washington, 13-17 June 2011
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL
Sponsoring Org:
DOE Office of Science
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CAVITIES; CONTROL SYSTEMS; CRYOGENICS; CRYOSTATS; FERMILAB; OSCILLATIONS; REGULATIONS; TIME DELAY Accelerators