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Linac Front End Focusing Solenoid R&D Status

Linac Front End Focusing Solenoid R&D Status. Requirements as of February 16, 2006. R&D Content. Choice of a strand and coil winding patterns Magnetic modeling (iterative) Stress management issues Quench protection issues Mechanical design Test and prototype solenoid program.

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Linac Front End Focusing Solenoid R&D Status

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  1. Linac Front End Focusing Solenoid R&D Status I. Terechkine for the FE meeting

  2. Requirements as of February 16, 2006 I. Terechkine for the FE meeting

  3. R&D Content • Choice of a strand and coil winding patterns • Magnetic modeling (iterative) • Stress management issues • Quench protection issues • Mechanical design • Test and prototype solenoid program I. Terechkine for the FE meeting

  4. SSC dipole inner layer NbTi strand: strand diameter ~ 0.808 mm filament diameter ~ 5 mkm Modified SSC strand to increase compaction factor Oxford rectangular 0.9 x 0.6 mm2 strand filament diameter ~ 70 mkm Round Oxford strands for compensation coils Strand R&D I. Terechkine for the FE meeting

  5. Strand R&D I. Terechkine for the FE meeting

  6. Magnetic Modeling I. Terechkine for the FE meeting

  7. Magnetic Modeling Strand Parameters Packing (or compaction) factor: K = (S_strand) / S_coil Global Parameters Performance at quench I. Terechkine for the FE meeting

  8. Winding Models I. Terechkine for the FE meeting

  9. Stress in Solenoids • Winding – inevitable strand tension and stress accumulation • Cooling down to 4 K • Excitation • Main Results of study in: • Analysis of Stress in PD Front End Solenoids - TD-05-039; • Test Solenoid Design Proposal – TD-05-040; • 3. Review 08-31-05 I. Terechkine for the FE meeting

  10. Stress in Solenoids T = 300 K I = 0 A T = 4 K I = 0 A T = 4 K I = 300 A I. Terechkine for the FE meeting

  11. Stress in Solenoids Hoop Stress After Winding - Pa Hoop Stress After Cooling down – Pa Hoop Stress After Energizing - Pa I. Terechkine for the FE meeting

  12. Quench Protection • Quench Propagation and Maximal Temperature • Quench heaters: -- do we need it? -- can we make it? Main Results of study in: 1. Focusing Solenoid Quench Protection Studies. Part I: Method Description and the First Iteration. TD-06-003 2. Focusing Solenoid Quench Protection Studies. Part II: Test Solenoid Quench Protection. TD-06-004 3. Solenoid Quench Heater TD-06-006 4. Review 12-02-2005 I. Terechkine for the FE meeting

  13. Quench Propagation I. Terechkine for the FE meeting

  14. Quench Propagation a) I = 200 A; t = 3.5 ms, 90 ms, 220 ms b) I = 250 A, t = 2 ms, 70 ms, 120 ms c) I = 330 A, t = 0.3 ms, 12.5 ms, 44 ms I. Terechkine for the FE meeting

  15. Coil Heating I. Terechkine for the FE meeting

  16. Quench Heater Quench delay as a function of insulation thickness a) tins = 50 μm b) tins = 100 μm c) tins = 200 μm I. Terechkine for the FE meeting

  17. Test Solenoid Expected Quench Current – 306.8 A Central Field at quench current – 7.1 T Maximal Field in the Coil – 7.5 T I. Terechkine for the FE meeting

  18. Stress Gauge - VISHEY, Micro-Measurement Group, WK-09-250BG-350/W Gauge Calibration Gauge readings during cooling down Stress during excitation I. Terechkine for the FE meeting

  19. Magnetic Field Field distribution with and w/o core Measured and Calculated Field Profiles w/o Flux Return Measured and Calculated Field Profiles with the Flux Return I. Terechkine for the FE meeting

  20. Heater Test I. Terechkine for the FE meeting

  21. Coil Quench Behavior Quench current is within 1% from the prediction I. Terechkine for the FE meeting

  22. Hysteresis in the magnetic behavior Measured hysteretic behavior was measured as a residual magnetic field at I = 0. The value of the residual field reaches + / - 16 Gs and almost does not depend on the excitation current. Magnetic core can be excused for only 0.5 Gs So, most probably, we see hysteresis in the strand. Some modeling work must be performed to explain the effect. Some anomalies in the current supply behavior (non-zero current at zero setting) must be addressed to allow precision measurements. I. Terechkine for the FE meeting

  23. Conclusion • The three test solenoids will provide information to allow strand choice for the main coil • The test solenoid behaves as predicted; this allow more subtle features to be investigated, e.g, hysteresis and coil fabrication precision • Prototype cold mass for the CH section focusing solenoid will address issues associated with the compensation coils Pre-release review was held on April 06 I. Terechkine for the FE meeting

  24. Solenoid for the CH-type accelerating module I. Terechkine for the FE meeting

  25. Plan of Actions • PDST-02 fabrication - ongoing • PDST-02 testing – April 17 – 28 • PDST-03 fabrication - April 17 – 28 • PDST-03 testing – May 01 – 12 • PDSCH-01 drawing release – ongoing • PDSCH-01 fabrication – May – July • PDSCH-01 testing – August • Design of the cold mass for S/C section can start in May. Allow ~ 3 month to prepare for a pre-release review. I. Terechkine for the FE meeting

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