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Undulators status

On 3/5/2010, discussions with Reiner and Rudiger revealed that trips on the RUL4 and RUR4 magnets were not due to quenches. We identified a DCCT measurement issue causing erroneous DIDT and U_res readings. Reiner will disable the inductive correction in the algorithm, requiring us to ramp down the current more slowly to prevent trips. Current operations are at 400A with ramp rates of 0.2A/s for RUL4 and 0.08A/s for RUR4. This adjustment will ensure safer magnet functioning.

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Undulators status

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  1. RUL4 (left IP4) NC. 1 internal missing resistor Additional external resistor. . Never quenched 1 Trip at 420 A (no quench) Operate at 400A. Ramp Up/Down 0.2 A/s RUR4 (Right IP4) NC. None .3 training quenches in 2008 (422, 445, 450 A) never quenched in 2010. Operate at 400A. Ramp Up/Down 0.08 A/s Undulators status Dear all, Friday 3/5/2010 After discussing with Reiner and Rudiger, it seems that none of the trips of this magnet was a quench. There is a problem with the DCCT measure that creates a fake DIDT and a fake U_res. Reiner is going to disable the inductive correction in the algorithm and implemented as soon as possible. That will mean that we have to ramp slowly, probably even slower than now, to avoid a trip. In any case, this will be self-regulating. I put a comment on the first entry of todays logbook. Nuria R.M. ESLM 22 March 2010

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