Thu Aug 25 10:46:29 PDT 2005

FLO - pumping down on helium reservoir

Having a good vacuum on the helium reservoir is necessary for maximizing liquid helium use. Because FLO is at room temperature and at atmospheric pressure, the system needs to be pumped down. After 4 days of vacuuming the system, an acceptable pressure is achived. (~2x10^-6 torr).

Posted by Jason Steindorf | Permalink

Thu Aug 25 09:40:10 PDT 2005

Liquid helium fill - BUBBA

Filled BUBBA with about 30 liters of liquid helium yesterday. The fill went smooth and took about 25 minutes. Roi assisted with the fill.

Posted by Jason Steindorf | Permalink

Tue Aug 9 10:28:59 PDT 2005

SI-4 AF Demagnetizer -- NOT working

The SI-4 AF Demagnetizer isn't working. The control unit seems to be fine, though it's unable to be tuned and the coil no longer builds a charge after it's triggered. The coil, control unit, cradle, and power supply are being sent back to M. Stupavsky for servicing.

Posted by Jason Steindorf | Permalink | Categories: instruments

Thu Aug 4 07:53:33 PDT 2005

Liquid helium fill - BUBBA

Filled BUBBA with approximately 30 liters of liquid helium (8/3/05). This was the first smooth fill in a couple of months. Julie helped with fill and it took about 20 minutes to complete. An obvious change in the plume occured this time. BUBBA'a reservoir was then measured with the dip stick, measuring ~28 inches meaning it's 100% full.

Posted by Jason Steindorf | Permalink | Categories: instruments