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|                    The GSA Presents                      ||
|        A tour of the Central Helium Liquifier!           ||
|               Tuesday, June 16, 5:00 pm.                 ||
|                                                          ||
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Supporting the world's highest energy proton/antiproton 
collider, the Fermilab's Tevatron cryogenic system consists 
of a Central Helium Liquefier (CHL) feeding twenty-four 1 kW 
satellite refrigerators through a 6.5 km co-axial transfer 
line that supplies the liquid helium to the superconducting 
magnets of the Tevatron accelerator and liquid nitrogen for 
the thermal shielding. In 1993, the American Society of 
Mechanical Engineers designated the Fermilab Cryogenic 
Cooling System as an International Historic Mechanical 
Engineering Landmark, recognizing the many innovations and 
its uniqueness at time of construction beginning in 1978.
  
The tour of the CHL facility will include two helium cold 
boxes rated at 4,000 and 6,200 liter per hour of helium 
liquefaction, four reciprocating helium compressors with a 
total of 5.1 MW power providing 2370 g/s helium at 12 atm 
to the cold boxes, a 100-ton per day liquid nitrogen plant, 
and various support subsystems.

So directions specifically are: head west from the Eola 
stoplight past CDF.  Turn right just before Feynman Center
(this is road B), and the CHL facility is to your right
(across the road from FCC).

As always, we'll congregate around the tour entrance at 5:00 and
begin the tour promptly at 5:10, so don't be late!

Hope to see you there.

                                         --- Kevin P. Davis
                                             for the GSA