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DC Superconducting Transformer Control System LBNL Superconducting Magnet Group Arno Godeke

DC Superconducting Transformer Control System LBNL Superconducting Magnet Group Arno Godeke October 1, 2007. Bill Of Materials(?). Measurement and control: One or two Cu Rogowski’s 4 ordered commercially 24 bit AD/DA Input Rogowski signal Output primary control voltage

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DC Superconducting Transformer Control System LBNL Superconducting Magnet Group Arno Godeke

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  1. DC Superconducting Transformer Control System LBNLSuperconducting Magnet Group Arno Godeke October 1, 2007 A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  2. Bill Of Materials(?) • Measurement and control: • One or two Cu Rogowski’s • 4 ordered commercially • 24 bit AD/DA • Input Rogowski signal • Output primary control voltage • (Perfect) digital integrator • Control software • Hardware • Bipolar PS: 20 V / 100 A, voltage controllable • 1000 turn 100 A primary • 1.5 turn, 50 kA secondary • Mechanical support structures (F=BxI: 15T, 50 kA…) • Main loads are Torque in bifilar cable samples A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  3. Transformer Control Schematic PS errors Uset U/I RPShunt RP A1 ++ +- A3 LP -+ MPS MPR A2  LS -+ LROG ++ Usec MSR INT errors RSam1 RSam2 --- = main --- = errors --- = correction LSAM2 LSAM1 RSam1-2 UP IP UI UR IS 1) UP = IP(RPShunt + RP) + LPdIP/dt - MPSdIS/dt 2) MPSdIP/dt = (RSAM1 + RSAM2 + RSAM1-2)IS + (LS + LSAM1 + LSAM2)dIS/dt 3) UR = - MSR dIS/dt  UI = - MSR + C A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  4. Target block diagram ErrorPS PS + Isec Uset + + H1 H2 - + H4 H3 + ErrorINT Isec / Uset=H1H2 / (1 + H1H2H3H4) Isec / ErrorPS=H2 / (1 + H1H2H3H4) Isec / ErrorINT=H4H1H2 / (1 + H1H2H3H4) A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  5. Main system +- UP Uset U/I A1 RP IP LP UI UR MPS -A2  LS LROG IS Usec MSR RSam1 RSam2 LSAM2 LSAM1 RSam1-2 A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  6. Transfer function • Laplace transformation: Is UP IP Uset + + A1 - - A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  7. Transformer and feedback HT UP Uset Is + A1 - A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  8. S-space to frequency space: s  j, HSystem = a + jb |HSystem| = Amplitude spectrum Arg(HSystem) = Phase spectrum Stability: Above 180 degree phase shift |HSystem| < 1 S-domain to frequency spectrum A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  9. Overall transfer function (error sources pending) Frequency spectrum Isec/Uset A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  10. ‘Typical’ VI measurement on a cable At ~0.05 m ~ 2.5 microV A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  11. VI with current ramp DC VI measurement Measurement procedure Set Isec = 0 Set Isec = 0 Measure: Isec Vsample Measure: Isec Vsample Write data Write data Isec = Isec + a dIsec/dt Set Isec = Isec + Istep Measure: Isec Vsample N Sec. quench? Sec. quench? Y Set Isec = 0 Write data Write VI dataaround Iquench Write VI dataaround Iquench Wait t1 A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

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