SPARO Dewar Requirements
Below is a list of requirements for the SPARO dewar. We are going to design
the dewar to meet the essential requirements list, while incorporating
as many of the desirables as is feasible. If the drop dead requirements
cannot be met, we cannot deploy SPARO in 1997.
- 50 hour hold time for LHe and LN2
- can remain cold and under vacuum for > 3 months.
- cold weather ruggedness
- Viper telescope size constraint: 50" long, 16" in diameter, beam center
is offset 3" from dewar center.
- Viper telescope weight constraint: ?
- noise/sensitivity threshold
- easy to cycle He3 outside. (reliable pumping at -100 C, only require
a couple of trips outside)
- ability to remotely monitor health of system (cryogen levels,
temperatures, case pressure, etc).
- 55 hour hold time for LHe and LN2
- easy cryogen transfers
- remote He3 cycling
- ease of observing procedure and set-up
- ease of assembly/disassembly
- easy to pump down & cool down
- complete and detailed documentation
- modularity of critical components to increase serviceability
- Drop Dead:
- 28 hour hold time for LHe and LN2
- cold weather servivability
- reliable cryostat and He3 system.
- can fit on Viper telescope
Last revised January 28, 1996. Contact email@example.com