| Autor: |
Geynisman, M. G., Makara, J. N. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2002, Vol. 613 Issue 1, p199, 8p |
| Abstrakt: |
Fermilab's Tevatron Superconducting Accelerator has begun operations of colliding beams of protons and antiprotons at 980 GeV. This has been accomplished by lowering the operating temperature of the Tevatron magnet system from 4.5K to 3.6K using cold compressors on the two-phase portion of the system. The heat of compression by the cold compressors produces a greater liquid helium demand from the Central Helium Liquefier (CHL). Various upgrades have been completed or are in progress to provide sufficient capacity and redundancy for the liquid helium supply. The maximum allowable pressure of the helium system has been raised from 1.31 MPa to 1.65 MPa, thus providing a measured 18% liquefaction capacity increase for same compressors flow. One of four reciprocating helium compressors has been modified for four-stage operations, thus providing 33% increased capacity and more reliable operations. Together with capacity control of individual compressors, the available choice of operation of two 3-stage and two 4-stage compressors will provide the flexibility to operate the Central Helium Liquefier system at the most economical power consumption relative to the liquid helium demand by the accelerator cryogenic system. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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