GlueX Solenoid Update George Biallas May 12, 2010 GlueX Collaboration Meeting

Update: May 2010 Lehman Review Findings Recent review of existing SC solenoid concluded: Design & fabrication of a replacement solenoid would delay CD-4 significantly Refurbishment of the existing solenoid should continue. Leaks and shorts to ground are being repaired. Shorts to the supporting strip cannot be repaired. Individual coil tests will complete in May Full solenoid tests, with realistic operating conditions, will complete in September Comments: The solenoid is prone to shorts. In GlueX, it will be operated under different conditions than in the past, and its coils will be exposed to larger mechanical forces. Consequently, there is risk of new shorts that could compromise operation or permanently damage the solenoid during a quick discharge.

Update: May 2010 Lehman Review Continued Analysis of the impact of shorts should be extended to worst case situations. Means to reduce risk of permanent damage should be developed, for instance by decreasing induced voltage in shorted turns, e.g.by reducing discharge voltage or using additional low heat load current leads and cold diodes. Design & structural analysis of coil supports against axial forces should be completed. Means should be pursued to shorten the projected schedule for producing a replacement solenoid. Refurbishment and testing of the existing solenoid should continue expeditiously. The SC solenoid is a critical component of the GlueX Spectrometer, which is a centerpiece of 12 GeV Upgrade Project. Recommendations Initiate design of a back-up, replacement solenoid now. Convene an external peer review to review risk mitigation plans and to advise regarding implementation of a replacement solenoid. Report on outcome at next DOE review.

Update Continued Response to Lehman Review Evaluating Turn–to-Turn failure mode Re-convening the internal review board tomorrow Solenoid Coils Refurbishment Coil 1 – In final leak test Coil 3 – IUCO starting to apply new, stainless steel shield Coil 2 – taken apart in the test lab for Sub Coil 2D buttressing Coil 4 – Ready to Test Coil Testing Cryo Can nearing completion at Meyer Tool & Manufacturing for May –June delivery Some Mechanical Hardware in fabrication – Anaconda support Platform assembled, Rails and mounting surfaces installed for yokes A few auxiliary items in design and bidding Chimney interconnect piping and shield, Top of Cryo Can relief stack Yoke ring movement in contracting

Update Continued Controls Substantial activity continuing – Elliot Wolin and a great cast of Electrical Folk – Most hardware on hand, Racks being wired PLC Programming in last stages, Screens being worked Analysis of Pressure System – Use of Access plates in Vacuum Vessel as reliefs to keep any overpressure very low was successful, trial of two examples opened at 15 psig – use on 3 coils – Coil 2 needs further work because Yoke blocks venting Hall D Installation Jack stands given to Concrete Pier Contractor Design of Magnetic Baffles, Yoke gap fillers, BCal supports 90 % detailed Design of Cryo box, U-tube Can, Cryogen Transfer Line, Piping and relief system well under way

Solenoid Coil Test Set Up Page 6 Detail designs complete on all long lead items Cryo Can due in June All hardware ready by end of May Racks complete (and tested) by early June Power supply in place Rails/Supports in place Anaconda Cryo Can Power Supply Rails Coil 1 End Plate Racks

Test Platform Assembled

Solenoid Test/Repair Set Up Rails ready to be grouted Coil 1 & 2 being repaired Page 8

Solenoid Repair/Test Manpower 3 Hall D Staff Techs 1 Full time Magnet Tech. Hall D Work Coordinator 2 Mechanical Engineers 3 Designers Help as needed from JLAB Mechanical Inst’l, Vacuum, SRF, Physics Electronics and Engineering Electrical Fab groups. (Tasks include rigging, leak check, wiring, cable fab) IUCO Repairing Coil #3 Page 9

Solenoid Control Racks Page 10 Fully Populated and Ready for wiring!

Summary Repairs nearing completion Test setup underway Testing will prove that repairs are robust Staff in place for repair and tests Confidence in repairs Technical/Safety review for repairs and testing scheduled for end of May. Still 1 month free float on BCAL inst’l Page 11