CFHT operating manual - Homepage Usask

CFHT Observatory Manual - Observatory (Sec.4) http://www.cfht.hawaii.edu/Instruments/ObservatoryManual/CFH...
D.C. supplies.
The following A.C. power is available at Cass.
220 V.A.C. 50 HZ power is available in standard French sockets
800 watts maximum.
208 V.A.C. 60 HZ 3 phase power is available in standard French sockets
2000 watts maximum.
208 V.A.C. 60 HZ 3 phase power is available in standard American sockets
3000 watts maximum.
110 V.A.C. 60 HZ power is available in several places at Cass.
Instrumentation Cabling
The general purpose instrumentation cabling available at the Cassegrain
focus consists of various sizes of overall shielded twisted pair,
individually shielded twisted pair and coax cables. These connectors run
between the CFP2A (Cassegrain Focus Panel 2A) at the Cassegrain
environment and the CPP2 in the observers room on the fourth floor.
Cryogen Pumping System
A vacuum system is available for pumping on cryogens, as is required with some IR
detectors. There are two separate
lines each connected to a Sargeant-Welch Model 1397 mechanical pump (500 liters/minute)
located on the second floor.
The lines terminate at a manifold which is permanently installed on the Cassegrain
environment. The manifold has valves
which permit the two systems to be used independently or in parallel and vacuum gauges to
monitor the pressure. The
connection between the manifold and the cryostat is made with flexible plastic tubing and
Klamp Flange or Alcatel KF
10 or 16 fittings.
Observers needing this facility must so specify on the Visitor Instrument Questionnaire and
on the Guest Observer
Information Sheet. Note that use of the system severely restricts the range of rotation of the
Cassegrain environment.
If this is a potential problem, it should be discussed with CFHT staff well in advance of the
run.
Cassegrain Bonnette
Overview
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