ORBUMP Power Supply... 16x3 SCR’s Pulse Forming Network (PFN) - looks like a very slow transmission line. Flat top ~ (10 usec)*(number of cells). Reduced.

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Presentation transcript:

ORBUMP Power Supply... 16x3 SCR’s Pulse Forming Network (PFN) - looks like a very slow transmission line. Flat top ~ (10 usec)*(number of cells). Reduced to 6 cells some time ago. Reduced to 4 last Thursday To magnets 30 kA Step-up transformer Controller Charging SCR ORBUMP steers beam out through stripping foil during injection

Recent Problems Last Thursday, a cooling hose broke. –HV bus bar broke down –Tuning rod melted Took advantage of the “opportunity” –Reduced PFN from 6 to 4 cells (should reduce heating of magnets). –Replaced all water hoses. –Removed unused inductors. When powering back up… –An SCR and some associated electronics blew –Replaced, happened again. –Disconnected all 48 SCR’s and verified all connections. Found some minor problems. Power came up after that, but… New PFN impedance changed V to I ratio. –When we attempted to raise V to compensate, ORBUMP started missing triggers, causing huge period 1 losses (which had nothing to do with LLRF!!) –Problems tracked down (after several days) to transient noise on the firing card. –Works now (?!?!?)

Effect of Shorter Pulse ORBUMP Temperatures

Plans for ORBUMP Immediate future (next week or so) –Improved water distribution (new manifold, some different plumbing). –Replace inductors with rebuilt spares. –Lucite tuning rods -> G10 (won’t melt). Longer term. –Buy new capacitors ($1K each) –Replace (48) SCR network with modern (4 or 8) network. On the table for a while Just got bumped up in priority. Goal to be in by summer. –New controller? Possibly use MP02 design directly?

RF Cavity Update All university fabrication under way or complete. Parts have started to arrive. All look OK so far. Assembly fixtures being constructed at MI-60. Still looks good for summer shutdown.

Collimators Dust still settling from review, but seems to have passed. Design more or less complete. Working out details of installation logistics. Still looks good for the summer shutdown.

Dogleg Replacement Meeting next week to work out details of design. Important to understand field quality requirements. Pulsed “anti-septum” Pulsed Magnet Kicked Beam Circulating Beam Just before Extraction