CERN Accelerating science

Article
Title	Spallation Neutron Source Drift Tube Linac Resonance Control Cooling System Modeling
Author(s)	Tang, Johnny Y ; Aleksandrov, Alexander V ; Champion, Marianne M ; Feschenko, Alexander ; Gibson, Paul ; Kiselev, Yuri ; Kovalishin, A S ; Kravchuk, Leonid V ; Kvasha, Adolf ; Schubert, James P
Affiliation	(ORNL/SNS, Oak Ridge, Tennessee) ; (RAS/INR, Moscow)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3754
Subject category	Accelerators and Storage Rings
Abstract	The Resonance Control Cooling System (RCCS) for the warm linac of the Spallation Neutron Source was designed by Los Alamos National Laboratory. The primary design focus was on water cooling of individual component contributions. The sizing the RCCS water skid was accomplished by means of a specially created SINDA/FLUINT model tailored to these system requirements. A new model was developed in Matlab Simulink and incorporates actual operational values and control valve interactions. Included is the dependence of RF input power on system operation, cavity detuning values during transients, time delays that result from water flows through the heat exchanger, the dynamic process of water warm-up in the cooling system due to dissipated RF power on the cavity surface, differing contributions on the cavity detuning due to drift tube and wall heating, and a dynamic model of the heat exchanger with characteristics in close agreement to the real unit. Because of the Matlab Simulink model, investigation of a wide range of operating issues during both transient and steady state operation is now possible. Results of the DTL RCCS modeling are presented