Weekly Meeting Highlights and Equipment Status Update
"Discover the latest updates from the ESS Spoke CM02 weekly meeting, covering topics such as cooldown procedures, cavity parameters, cold conditioning, and equipment tuning. Stay informed about the progress of key activities and maintenance tasks within the project." (389 characters)
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Presentation Transcript
ESS spoke CM02 weekly meeting 20201126 Han Li
CM status cooldown to 4 K (19th Nov.) PFC cold conditioning ( 20th Nov.) cooldown to 2 K (23rd Nov.) CTS measurement (24th Nov.)
FPC cold conditioning Simultaneously conditioning at 4 K Conditioning frequency 353 MHz Total cold conditioning time ~ 3 h (real time) Outgassing at 76 dBm up to 1.2E-8 mbar
Cooldown Cool down from 220 K to 4 K took about 5 h Cool down from 4 K to 2 K took about 1 h cold down from 220 K to 4 K temperature curves
Cavity parameter Cavity frequency (MHz) Room T 4 K 2K Cav_in 351. 584 352.151 352.132 Cav_out 351.538 352.114 352.094 Pressure sensitivity (Hz/mbar) Cav_in 17.5 Cav_out 18.5 QL Cav_in 1.5E5 Cav_out 2E5
Insert signal through a circulator Will check with decay measurement when RF on QL for Cav_in @ 4 K QL for Cav_in @ 2 K
CTS2 CTS2 move to target frequency 352.20984 MHz motor position: 1.78mm motor turns: 4543 Tuning sensitivity for Cav_out is about 85 KHz/mm
Piezo for CTS2 Unipolar : 0 to 200 V Bipolar:-40 to 200 V PZ21 has smaller range than PZ20
Issue CTS1 - The tuner seems stuck at 0.3 mm on the first run - The tuner seems now stuck at 0 mm - tuner get in the negative range and hit the mechanical stop No enough torque for the motor Increase driving current from 0.6 to 0.9 A Piezos for CTS2 - The polarity of cable from FREIA side is inverted Piezo respond correct - Is the polarity of piezos inside the CM inverted?
Preliminary time plan Test item time comment 26th-30th Oct. CM installation 2nd 4th Nov. Preparation Install cavity vacuum pump group /water cooling system 5nd-10th Nov. FPC warm conditioning 1) Simultaneously 2) Could be prolonged depended on the progressing 12th -17th Nov. Windowchange 18th-19th Nov. CM cooldown to 4 K 20th Nov. FPC cold conditioning Simultaneously 23th Nov. CM cooldown to 2 K 24th Nov. Cavity tuning CTS measurement 24th -27th Nov. Cavity conditioning (on resonance) Open loop 1)Each cavity 2) PID Heat load/Q measurement 30th Nov. Long-term stability 1st 4th Dec.. Piezo compensation First CM only 5th Dec. Warm up
