Maintenance for Helios
Date:
Sunday, September 12, 2004
Synopsis:
Leak Rate and Temp While Cooling Down
Equipment/Beam Line:
Description:
last cool down in 2004: @10:30(p=2E-4torr) BG(before zeroing ) 6E-9 @10:45(p=2E-4torr) started N2 to magnet . @10:55(p=8E-5torr) BG(before zeroing ) 1E-9 @13:10(p=3E-5torr) BG(before zeroing ) 4.E-9 @14:00(p=5E-5torr).N2 transfer stopped. BG(before zeroing ) 1.E-9 Temp: 79,283 78,098 77.865 252,83 251,92 263,45 before transfr N2 to nitrogen bath: 78,58 77.85 77.76 226.53 210.73 225.45 before transfering He : 81.38 109.44 81.42 77.94 174.67 142.41 While cool down with He: BG= 3,4E-7 to 2E-6 and stayed the same.