Damping Rings Kicker Magnet Improvements

South Damping Ring Magnet Upgrade AIP 68-22

P. Krejcik

E. Bong

1/6/99

Project Priorities

• Manufacture 80 new bend coils to replace failure prone (spliced) coils in all the SDR dipoles.

• Replenish our stock of bend magnet trim coils, used up during NDR bend coil replacement project. Some trim coils also to be installed in beamline bend magnets.

• Refurbish SDR QD's and QF's for coil block corrosion damage.

• Replace SDR magnet supports with newer NDR style to permit changing of bottom coils without venting ring.

Status • This is a continuation of work begun in the NDR where bend coils were replaced downtime before last. NDR coils had suffered overheating as well as corrosion problems.

We had 16 spare bend coils which were used to replace 8 of the SDR magnets last downtime.
Bend coils removed from the SDR are kept as emergency spares.
So far, only 10 coils (5 magnets) have been manufactured in time for this downtime, due to manpower limitations.
This project needs MFD support for completion of coil manufacture in time for the February downtime, plus a MFD manpower commitment to install the coils during the downtime.

Problems

Next priority, SDR QD's and QF's are all beginning to leak at the coil termination block joints. Most have been soft-soldered, in-situ as a temporary fix.
Minimum cost proposal is swapping out coils, at least one octant at a time (3 QD's, 2 QF's), removing one arc vacuum chamber at a time. Then refurbish used coils for installation in next segment of the ring at the next opportunity.
At present, we have 11 spare QF coils only, so we need to replenish our spares.
Note that in SDR we always need to vent the ring to replace lower magnet coils. Still looking for a way to fund manufacture of new style magnet supports as used in the NDR, to avoid venting.

Budget $201k (including G & A) allocated

-$50k used through 10/98

-$27k used in 11/98

$124k remaining.