1 / 13

Magnetics Program Highlights VLT Conference Call September 13, 2000

Magnetics Program Highlights VLT Conference Call September 13, 2000. presented by J.V. Minervini MIT Plasma Science and Fusion Center. Outline. Summary of successful testing of CS Model Coil and CS Insert Coil World’s largest pulsed superconducting and Nb 3 Sn magnet successfully tested

glenys
Download Presentation

Magnetics Program Highlights VLT Conference Call September 13, 2000

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Magnetics Program HighlightsVLT Conference CallSeptember 13, 2000 presented by J.V. Minervini MIT Plasma Science and Fusion Center

  2. Outline • Summary of successful testing of CS Model Coil and CS Insert Coil • World’s largest pulsed superconducting and Nb3Sn magnet successfully tested • Superconducting Quadrupole Magnets for IFE • Progress made by LLNL and MIT in HCX prototype coil design and testing • Successful acceptance test of LDX Floating Coil

  3. CSMC is Composed of 3 Coil Modules + + CS Insert Coil (JA) US Inner Coil Module JA Outer Coil Module = • Schematic Assembly of CSMC • and Support Structure Coil Assembly in Test Facility

  4. CSMC Was Extensively Tested I. CSMC test conditions A. DC operation 1. Confirmation of 13T at 4.5K and 5.3K 2. Critical properties determination 3. Joint resistance measurement B. AC loss measurement 1. Using resistive discharge at various currents and time constants 2. Using bi-polar field pulses 3. Using symmetric trapezoid field pulses C. Pulsed operation 1. Baseline scenarios to confirm 2K operating margin. 2. Determination of limiting ramp rates at T > 4.5K

  5. CS Insert Was Extensively Tested II. CS Insert test conditions A. DC operation 1. Confirmation of 13T operation point 2. Determination of critical properties (normal and reverse current) B. AC loss measurement 1. With and without transport current in the insert 2. Using resistive discharge at various current levels and time constants 3. Using bi-polar field pulses 4. Using symmetric trapezoid field pulses C. Pulsed operation 1. Stability measurement using pulsed inductive heater 2. Confirm 2K operating margin 3. Determine limiting ramp rates at T>4.5K D. Quench propagation measurement E. Cyclic operation to 10,003 cycles

  6. Results of DC Measurements Initial analysis of current sharing temperature shows conductor properties scale well from known strand, temperature and strain data. Joint Resistances were measured at 46 kA by electrical and calorimetry methods.

  7. Pulse Testing 13 T 0.6 T/s symmetric, trapezoidal ramp to 13T field in the CS insert. Coil was ramped as fast as 2 T/S to 13T.

  8. Ramp rate Limitation Tests No anomalous Ramp Rate Limitation observed - quenched by T due to AC Losses

  9. Superconducting Properties Affected by Cycling Decrease in Tcs of the CS Insert with number of cycles. Effect needs to be further studied.

  10. On Going Data Analyses 1. Conductor properties Incoloy magnetization, further analysis of superconductors 2. Joint and Conductor losses Joint losses consistent, ac losses need signifcant analysis 3. Limiting ramp rate limited by ac loss heating, HETR3D simulation planned 4. Pulsed stability data reduction continues, HETR3D simulations planned 5. Quench propagation velocity, hot spot temperature analysis 6. Coil properties mechanical, thermalanalysis • 2 Insert Coils Remain to be Tested in FY2001 • Nb3Sn TF-type conductor • Nb3Al TF-type conductor

  11. Racetrack Quads for IFE Development Status at LLNL LLNL HCX quad schematic(Racetrack Coils) • HCX LLNL prototype design complete • Designed field quality works well in physics simulations • Prototype fabrication is underway • Winding and assembly trials, and tooling development is in progress • Most of the parts for prototype program are procured • Developed a conceptual design of the HCX assemblies with 6 quads in one with interfaces with other HCX systems HCX layout Focusing unit Accelerating unit

  12. Quadrupole Magnets for IFE Development Status at MIT • MIT is analysizing the Cos 2 mulitlayer coil designs of Advanced Magnet Lab. Inc. (AML) • Magnetic field quality, stress analysis • Manufacturing joints and lead arrangment • Two single layer protoype HCX coils have been tested this summer at MIT • Both coils showed premature quenching at joints • New conductor and coil layer is being fabricated by AML • MIT will test when ready this fall 3D model of HCX quad (one of four coils shown, Cos2 spacing)

  13. LDX Floating Coil Successfully Tested in July F-Coil being inserted into MIT test dewar Removing mandrel from F-Coil after completion of final joint Tested to 5.66T at 2200 amperes

More Related