Beams Document 3876-v1

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Steady State and Dynamic Simulation of Cryogenic System for TIFR-BARC Superconducting Linear Accelerator

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Elaine McCluskey
Updated by:
Elaine McCluskey
Document Created:
31 May 2011, 22:17
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31 May 2011, 22:17
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31 May 2011, 22:17
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Large projects based on applied superconductivity, such as particle accelerators or fusion devices like tokomaks require complex helium systems. Helium is used in refrigeration mode for cooling of RF cavities and superconducting magnets in Particle Accelerators. The two phase flow is always encountered in cryogenic process due to heat inleak. The large variation in viscosity, heat capacity and thermal conductivity are of much importance for using helium as refrigeration media in single phase. The evaluation of the system considering these non-homogeneous transport phenomena, superfluidity and supercritical zone is necessary to validate the performance with respect to design parameters such as pressure drop, heat load and loss in refrigeration capacity. A versatile and efficient cryogen distribution system has been designed and fabricated to deliver both liquid helium and liquid nitrogen to the cryostats in LINAC. The two-phase helium at 4.5 K produced at the JT stage in the Linde TCF50s refrigerator is delivered to the cryostats through a cryogen distribution system. The cryogenic processes are considered to be a special niche in process simulation. Simulation of the refrigerator has been performed using Aspen Hysys®. Some specific customizations are required to cope with cryogenic applications.
Steady state simulation is used for design and rating purpose of the Helium systems. This analysis helps us to suggest rectification in existing refrigeration system and any modification if required in cryogen distribution system. Dynamic simulation is a tool to analyze the system in transient modes. The disturbances and fluctuations such as heat inleak, pulsed load and surges are modelled using dynamic simulation. The frictional pressure drop calculations give estimate of the loss in the refrigeration capacity due to the helium fluid flow in the system. The control parameter values for pressure, temperature and valve opening to achieve equal flow in each cryostat are calculated. The standalone heat load calculations were done to estimate the theoretical values using heat and mass transfer principles.
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