Jun 22, 2011 Replacement Solenoid
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Contents
Items for followup from previous meeting
Tentative Agenda
- 8:30 Meet in CC324. Tour of the Hall D experimental area.
- Elton, Tim
- 9:30 Tour of the test lab and ongoing testing of individual solenoid coils.
- George, Elton
- 10:30 CC324. Group Discussion/ Question & Answer session
- George, Tim, Eugene, Elton, Johathan, Glenn
- Ettore on the phone (not confirmed)
- Lunch
- 1:30 Closeout
- Clarify any remaining questions
- Assign task list for future work
- 2:30 Discussions with Hall B personnel concerning toroid (not confirmed)
Minutes
Attending: Brad Smith, Alexey Radovinsky, Elton Smith, Glenn Young, Eugene Chudakov, George Biallas, Tim Whitlatch, Jonathan Creel
- Brad and Alexey were given tours of the experimental Hall D and the coil test in the Test Lab
- Discussions began with presentations by Alexey (magnetic and mechanical design) and Brad (conductor choices)
- Magnetic and mechanical design (Alexey)
- Used ANSYS 2D and Vector Fields 3D modeling
- Fringe fields 6m downstream is calculated at 230-250 G, exceeding the specification. No cladding was included to this point, but will be added and fields checked
- Three subcoils used to produce the field profile
- Calculated axial Lorenz forces on coils was 1.4 MN.
- George will provide comparable forces on the existing coils
- Winding and mechanical supports were presented
- Project organization (Brad)
- Brad will serve as project engineer and also responsible for conductor design and quench protection
- Alexey responsible for field design and mechanical design
- Cryogenic engineer will be added at the appropriate time
- Mechanical designer provides support with Solid Works for drawings and integration
- Conductor options considered
- New SS cable and stabilizer
- Possibly optimum, but cable cost ~ $180k, 5800 A capability
- Existing SSC cable soldered into copper stabilizer
- Most likely the most practical option. 7500 A capability
- Existing SSC cable soldered into aluminum stabilizer (likely use 5083 Al)
- High premium cost for conductor compared to copper, and technically challenging.
- Require about 7600 m of conductor. Joints may be required and if so would be placed at the end of each layer.
- The CIC option has not yet been evaluated, but will be in time for July milestone.
- New SS cable and stabilizer
Action Items
- Complete interface drawings with sign off. (Tim)
- Also make available drawings of filler rings.
- The Filler Ring Drawings are in a directory on the web: [ http://www.jlab.org/~ballard]
- The sub folders are:
- The simple fillers: /D00000-04-02-2124_2125T
- The remaining fillers: /GLUEX_Ring_Girders
- Include estimate of Helium level
- Also make available drawings of filler rings.
- Provide parameters of refrigerator and cryogenic system (Johnathan)
- Provide drawings of service cryo cans (both D and C types) (George)
- The Cryo Can Assembly Drawings are in a directory on the web; Cans CryoCans
- The Cryo Can Drawings for Hall C with 5000A Leads that are welded into place on a magnet cryostat are in Subfolder: /HallC
- The Cryo Can Drawings that utilize a flanged bellows-like outer connection with o-rings, 2000 A Leads and CF Flange connections for the LASS Solenoid Piping are in subfolder: /HallD
- Add cladding to model and repeat magnetic calculations to check fringe fields (Alexey)
- Send (draft) presentation to everyone (Alexey and Brad)
- Consider options for inserting coil from upstream end. (JLab)
- Preference is to have the chimney upstream (to minimize saturation downstream and have lower fields at current leads), but will weigh alternatives
- Provide guidance on location following evaluation
- Provide estimate weight of coil (Brad)
- Provide table of lengths of SSC cable, so that splicing options can be studied (Elton)
- Get name of company that is extruding copper channel for conductor (Elton/Glenn)
- Provide information regarding the nitronic rods (non-magnetic stainless) as an option for tensioning supports (Tim)
- Specify guidelines (requirements) for burnout-proof leads (George?)
- (Added while writing minutes) Provide forces on existing coils for comparison with new coil (George)
- (Added while writing minutes) Provide quench protection circuit for existing coil , including voltage delays and thresholds (George)