List of responsables in 2012:
- Magnet cryogenics: Laura Stuart - 160720
- Magnet power supply: Yves Gaillard - 160950, Xavier Genillon - 162019, on call service - 163668
- Magnet: Alexei Dudarev - 164016
Magnet history in 2012:
- Problem with VTX2 cryogenics, solved.
- Problem with VTX1 and VTX2 current lead cooling water: flooded the area, especially VTX2 downstream side due to unterminated water pipe. Solved: cut water connections, closed valves. These lines are not necessary (were never used before).
- Problem with ramping up VTX1. First around 2000A some 40mV amplitude and 10ms duration spikes appeared on the voltage difference of the up and down coils of VTX1. Solved: added higher voltage alarm limit to magnet software with 100ms time tolerance window. Then, around 4000A the cryogenics were not regulated in proportion to current. Solved: software bug in cryogenics software.
- Problem with reading exact currents on GUI display. Temporary workaround: click "Terminal Window", then type "adc16 2". Software people came to solve, now it seems OK.
- The short small amplitude spikes of VTX1 are not observed anymore after proper fixing of S4.
- 2012.07.19 around 07:00: VTX1 loses vacuum and quenches.
Magnet settings in 2012:
- For 158GeV/c p beam: VTX1 (set: 5011.6A, read: -5011.89A), VTX2 (set: 3774.4A, read: -3779.26A). Reference value from 23.08.2000: VTX1 (read: -5011.6A), VTX2 (read: -3779.5A). |