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Progress for the VHFSMC`

Progress for the VHFSMC`. BNL FNAL FSU-NHMFL LANL LBNL NIST TEXAS A&M $2M PER YEAR FOR 2 YEARS. GOAL. EXPLORE BSCCO STRAND AS A BASIS FOR CONSTRUCTING MAGNETS WITH B>30 T.

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Progress for the VHFSMC`

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  1. Progress for the VHFSMC` BNL FNAL FSU-NHMFL LANL LBNL NIST TEXAS A&M $2M PER YEAR FOR 2 YEARS AVT 5-28-09

  2. GOAL • EXPLORE BSCCO STRAND AS A BASIS FOR CONSTRUCTING MAGNETS WITH B>30 T. BSCCO IS MADE BY INSERTING FINELYGROUND POWDER INTO A SILVER TUBE AND DRAWING DOWN THE COMBINATION TO A STRAND ABOUT 0.8 -1.2 MM IN DIAMETER. THE STRAND IS THEN WOUND INTO A MAGNET OR MADE INTO A CABLE TO BE USED IN A MAGNET. AFTER THE MAGNET COIL IS FORMED, THE STRUCTURE IS RUN THRU A COMPLICATED THERMAL CYCLE TO FORM THE SUPERCONDUCTOR. BSCCO STRAND HAS AN Ic THAT IS INDEPENDENT OF THE DIRECTION OF THE B FIELD AND IT CAN BE FORMED INTO A CABLE. YBCO IS A THIN FILM TECHNOLOGY AND IS USED AS A TAPE AND ITS Ic IS SENSITIVE TO THE FIELD DIRECTION. AVT 5-28-09

  3. HEAT TREATMENT • Figure 3. A typical heat treatment profile for Bi-2212 wire reaction. This empirical reaction procedure typically has tight tolerances ±2°C on Tmax, different specifications on the heating and cooling rates Rx and secondary hold temperature and oxygen partial pressures. There is a huge need to understand what occurs during each step of the process so as to better optimize it. Quenching samples from multiple points in the process and correlating microstructure and superconducting properties is one important tool to be applied to this goal. AVT 5-28-09

  4. THE VHFSMC HAS SET UP 6 TASKS FOR INITIAL WORK TASK 1: UNDERSTAND AND DEVELOP HIGH JC CONDUCTOR THROUGH SYSTEMATIC STUDIES OF CONNECTIVITY, PHASE DEVELOPMENT, REACTIONS, AND VARIABLE HEAT TREATMENT PARAMETERS. Task Leaders): Eric Hellstrom (Florida State University) and Terry Holesinger (LANL). TASK 2: MEASURE AND UNDERSTAND THE RESPONSE OF 2212 CONDUCTORS TO AXIAL AND TRANSVERSE LOADS. Task 2 Leaders): Najib Cheggour NIST and Arno Godeke LBNL TASK 3: DEVELOPMENT OF 2212 CABLE TECHNOLOGY. Task 3 Leaders): Emanuela Barzi, Al McInturff TAMU TASK 4: UNDERSTANDING THE STABILITY AND QUENCH BEHAVIOR OF CONDUCTORS AND COILS. Task 4 Leaders): Justin Schwartz (Florida State) and Soren Prestomon (LBNL) TASK 5: TEST OF PROGRAM-DEVELOPED 2212 CONDUCTORS IN A WIND-AND-REACT COIL ENVIRONMENT. Task 5 Leaders): Ulf Peter Trociewitz (FSU) and Arno Godeke (LBNL) TASK 6: INDUSTRIAL MANUFACTURE AND COLLABORATIVE R&D. Task 5 Leaders):Ken Marken (LANL) and Dan Dietderich (LBNL) . AVT 5-28-09

  5. TASK 1: UNDERSTAND AND DEVELOP HIGH JC CONDUCTOR THROUGH SYSTEMATIC STUDIES OF CONNECTIVITY, PHASE DEVELOPMENT, REACTIONS, AND VARIABLE HEAT TREATMENT PARAMETERS. Task Leaders): Eric Hellstrom (Florida State University) and Terry Holesinger (LANL). WHAT IS HAPPENING AT EACH POINT OF THE HEAT TEATMENT THAT PRODUCES THE STRUCTURE ON THE RIGHT? IS THE THERMAL PATH OPTIMUM? CAN THE Ic BE INCREASED? AVT 5-28-09

  6. TASK 2: MEASURE AND UNDERSTAND THE RESPONSE OF 2212 CONDUCTORS TO AXIAL AND TRANSVERSE LOADS. Task 2 Leaders): Najib Cheggour NIST and Arno Godeke LBNL • TWO IMMEDIATE JOBS • IS THE COMPOSITION OF THE BSCCO OPTIMUM? • THE STRAND IS MADE OF SILVER AND IS VERY SOFT. CAN IT BE STRENGTHEND? AVT 5-28-09

  7. TASK 3: DEVELOPMENT OF 2212 CABLE TECHNOLOGY. Task 3 Leaders): Emanuela Barzi, Al McInturff TAMU CABLE IS CRUCIAL. IT CARIES HIGH CURRENT AND LEADS TO LOW INDUCTANCE MAGNETS. IT MAKES USE OF THE EXPERIENCE WE HAVE GAINED WITH MAGNETS USING NbTi AND Nb3Sn. BUT CAN IT BE MADE SUCCESSFULLY? HOW MUCH Ic DOES ONE LOOSE IN CABLING? IS THE REACT-WIND-SINTER PROPOSAL REAL? THE BIG ADVANTAGE IS THAT THE CABLE HAS LOW THERMAL MASS AND CAN TAKE ADVANTAGE OF PRECISSION TEMPERATURE CONTROL DURING THE REACTION PART OF THE CYCLE. SEE EMANUELA’S TALK! AVT 5-28-09

  8. TASK 4: UNDERSTANDING THE STABILITY AND QUENCH BEHAVIOR OF CONDUCTORS AND COILS. Task 4 Leaders): Justin Schwartz (Florida State) and Soren Prestomon (LBNL) THE QUENCH BEHAVIOR OF HTS MAGNETS IS VERY DIFFERENT THAN THOSE USING Nb TECHNOLOGY. THE QUENCH PROPAGATION IS VERY SLOW AND THE TEMPERATURE MARGIN IS MUCH LARGER. NO HTS COILS WITH LARGE ENERGY STORAGE HAVE BEEN MADE YET! AVT 5-28-09

  9. TASK 5: TEST OF PROGRAM-DEVELOPED 2212 CONDUCTORS IN A WIND-AND-REACT COIL ENVIRONMENT. Task 5 Leaders): Ulf Peter Trociewitz (FSU) and Arno Godeke (LBNL) THE FUNDING FOR THIS PROGRAM DOES NOT INCLUDE THE CONSTRUCTION OF A LARGE MAGNET. IT DOES INCLUDE SUPPORT FOR MAKING INSERT COILS THAT CAN BE PLACED IN EXISTING MAGNETS SUCH AS EXIST AT NHMFL. THIS WILL GIVE INFORMATION ON THE WIND AND REACT PROCESS, QUENCH PROTECTION AND FORCE CONTAINMENT. REAL MAGNETS MAY COME THRU SUPPORT FROM MCTF FUNDS OR THE SBIR ROUTE. AVT 5-28-09

  10. TASK 6: INDUSTRIAL MANUFACTURE AND COLLABORATIVE R&D. Task 5 Leaders):Ken Marken (LANL) and Dan Dietderich (LBNL) APPROXIMATELY $500 K IS DIRECTED TOWARD INDUSTRIAL SOURCES FOR THE PURCHASE OF POWDER, CONDUCTOR, AND POSSIBILITY R&D. SO FAR ONLY TWO ROUTS TO B>30T EXIST: YBCO AND BSCCO. THE FIRST IS STRONGLY SUPPORTED BY THE ELECTRIC POWER INDUSTRY BUT IS DRIVEN BY HIGH CURRENT, LOW FIELD AND HIGH TEMPERATURE APPLICATIONS. THERE IS SBIR SUPPORT FOR HIGH FIELD MAGNETS. BSCCO IS IN DANGER OF DISAPPEARING AND THE VHFSMC CHARGE IS AIMED AT UNDERSTANDING ITS POTENTIAL USE. AVT 5-28-09

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