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Update Magnet 1

Update Magnet 1. After the extended pump and purge period the vacuum reached 5.8x10-6 Torr. After an RGA scan the water peak had reached 3.5x10-6 Torr. A rate of rise test at that point gave 1.08x10-8 Torr/sec

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Update Magnet 1

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  1. Update Magnet 1 • After the extended pump and purge period the vacuum reached 5.8x10-6 Torr. After an RGA scan the water peak had reached 3.5x10-6 Torr. A rate of rise test at that point gave 1.08x10-8 Torr/sec • The LN2 pre-cooling started on schedule on the 22nd May. Twelve 240 litre dewers were used over a three day period. • The chamber was purged with Helium gas and pumped down to a few mBar, 5 times to ensure no residual LN2 was present. No part of the chamber reached below 100K • LHe cooling started on the morning of the 25th, the cool down to LHe temperatures took approximately 6 hours and utilised approximately 1250 litres of liquid Helium. • The last part of the dewer was used the next morning. • We are now waiting for another delivery of LHe to top off the volume and also to refill after a training run. • We will start setting up for the energising from today, 30th, unknown how long this section will take.

  2. Cooler operating LN2 Cooling LHe Cooling Cold Mass sensors Second stage head First stage Cooler LN2 Dewer Change

  3. Update Magnet 2 • All sensors and heaters have been installed to the cold mass. • The cold mass has been wrapped with MLI. • The radiation shield is ready for assembly around the cold mass and will be put in place today. • The vacuum chamber is having some grinding work done at the moment to prepare for the welding of the support feet. • All 8 cold mass supports have been wrapped with MLI and ready for installation. • Six 2 stage cold heads have had their new hardware installed, the sensors will be installed as soon as they arrive from calibration at Fermilab.

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