South Damping Ring Magnet Upgrade

Damping Ring Magnets and Supports New AIP Project

P. Krejcik

E. Bong

2/24/99

GOALS

Enhance the reliability of the Damping Ring magnet system and minimize the downtime when magnet coils are replaced.

SCOPE

Provide drop-out supports to the magnets on the 4 Y-girders to allow coils to be replaced without venting the rings. Arc magnets are already done this way.

Replacement program for SDR arc quadrupoles to upgrade the corrosion-prone coil termination blocks.

COST ESTIMATE

Magnet supports

16 Y-girder magnet supports for the NDR and SDR

based on arc magnet supports, $2-3k ea. à $32-48k

better estimate will come after design work started.

SDR arc QD and QF termination upgrade

Propose girder-by-girder replacement of these magnet coils, rather than wholesale replacement of coils on 40 magnets (cost effective).

1 girder has 5 QF’s and 5 QD’s requiring 40 coils à $40k

Installation takes approximately 8 man-weeks per girder (based on our knowledge that bends take 6 man-weeks per girder).

At $60/hour à installation per girder is $19.2k

The coils that are removed are then refurbished with new terminations and jumpers so that the next girder can be replaced in a subsequent down-time.

The present coil block fittings are brass (easily damaged) and are either soft soldered (cracks easily) or threaded with PTF sealant (corrosion damage). New design uses brazed stainless fittings.

Refurbishment costs for these girders amounts to:

For 40 magnets

320 termination blocks at $25 ea. à $8k

120 jumpers at $20 ea. à $2.4k

Total cost

$40k coils

$19.2k x 4 = $76.8k installation

$8k fittings

$2.4k

$127k

+$40k for the Y-girder magnet supports

$167k total