New cryogenic controls for the tevatron low temperature upgrade

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:47809

Norris, B; Brubaker, J; Franck, A; Lublinsky, B; Lucas, P; Theilacker, J; Seino, K C; Smolucha, J ^[1]

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1. Fermi National Accelerator Lab., Batavia, IL (United States)

Fermilab`s Tevatron accelerator is undergoing a major cryogenic system upgrade. This upgrade project is necessary to lower coil temperature of the accelerator`s magnets by approximately 1K. The new system configuration utilizes a new valve box containing a 130 liter subcooling dewar and a Cold Compressor at each of the 24 satellite refrigerators. Each Cold Compressor pumps on a dewar to maintain the two-phase pressure at 50.7 kPa (0.5 atm) producing 3.56K helium in the dewar and magnet strings. The valve box and cold compressor installations, coupled with the need for new wet expander controllers and the addition of a significant amount of instrumentation, forced the immediate need for additional cryogenic control capabilities, which could only be met by major hardware and software upgrades. The additional requirements of the new cryogenic system doubled the number of I/O terminations per satellite, exceeding the capability of the original Multibus I, Z80-based distributed controls package. The original controls package, although highly successful over the last 10 year period, had already reached the upper limits of its capabilities with the many previous changes the cryogenic systems had undergone (i.e., Low Beta Magnet installations). The need for more digital and analog hardware, along with the desire for further control loop and automated controls features guided the new design.

• OSTI ID: 47809
• Report Number(s): CONF-930703--
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
COMPUTERIZED CONTROL SYSTEMS
CRYOGENICS
FERMILAB TEVATRON
MODIFICATIONS