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The MiniBooNE Horn

The MiniBooNE Horn. Ioanis Kourbanis For The MiniBooNE Collaboration. Outline. List of people Horn characteristics Horn Power Supply Horn Striplines Highlights of Horn Construction and Assembly Horn Testing Horn Changeover Future Plans. List of People. C. Anderson

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The MiniBooNE Horn

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  1. The MiniBooNE Horn Ioanis Kourbanis For The MiniBooNE Collaboration NBI 14-19 March 2002

  2. Outline • List of people • Horn characteristics • Horn Power Supply • Horn Striplines • Highlights of Horn Construction and Assembly • Horn Testing • Horn Changeover • Future Plans NBI 14-19 March 2002

  3. List of People • C. Anderson • L. Bartotzek (Bartoszek Engineering) • L. Bartelson • L. Bugel • C. Jensen • H. Le • B. Markel (Markel & Associates) • J. Misek • F. Nezrick • H. Pfeffer • R. Reilly • D. Snee • M. Sorel • E. Zimmerman NBI 14-19 March 2002

  4. Horn Characteristics • We are using one horn with a narrow neck and a conical inner conductor (BNL Design) designed to run at a current of 170 KA. • The horn is made out of Al alloy 6061-T6 and is excited by a 143 sec current pulse. • Keep the voltage at the PS below 10 KV (use solid state SCR’s instead of thyristors) • Reduce the current pulse width as much as possible to avoid excessive heating of the horn . • Keep the voltage at the horn as low as possible (small inductance). • The horn will operate at an average rep rate of 5 Hz. Total average power deposited in the horn is 2.4 KW. NBI 14-19 March 2002

  5. 3-D Model of the Horn NBI 14-19 March 2002

  6. Horn Power Supply • The Power Supply consists of a Capacitor bank (1,344 F) discharged through an inductive load by an SCR switch. The system has a separate circuit for energy recovery. • The circuit is divided into 16 parallel capacitors, each with its own SCR switch. NBI 14-19 March 2002

  7. Horn PS Parameters NBI 14-19 March 2002

  8. Power Supply Schematic NBI 14-19 March 2002

  9. Power Supply View (Front) NBI 14-19 March 2002

  10. Power Supply View (Back) NBI 14-19 March 2002

  11. Horn Stripline • Balanced design (odd number of conductors) to minimize forces. • The conductor spacing is 1 inch. Fluted alumina insulators with a 2 inch creepage length were used to separate the conductors. • The test stripline piece, along with a clamped joint, were corona tested. • The inductance of the final stripline was measured to be 18.5 nH/m. NBI 14-19 March 2002

  12. View of the Long Stripline Section NBI 14-19 March 2002

  13. View of a Stripline Joint NBI 14-19 March 2002

  14. View of the Small Stripline Section NBI 14-19 March 2002

  15. Construction and Assembly Highlights • Forged Outer Conductor • The water sprayers were vibration isolated from the Horn Outer Conductor. • Solid connections from the striplines to the Horn. • The Horn Inner Conductor was welded at Fermilab using a programmable TIG welding machine. NBI 14-19 March 2002

  16. Outer Conductor after Forging NBI 14-19 March 2002

  17. Outer Conductor after Machining NBI 14-19 March 2002

  18. Outer Conductor after Welding NBI 14-19 March 2002

  19. Water Manifolds NBI 14-19 March 2002

  20. Water Truss NBI 14-19 March 2002

  21. Water Truss and Water Manifolds NBI 14-19 March 2002

  22. Water Truss Bellows Detail NBI 14-19 March 2002

  23. Water Connection Detail NBI 14-19 March 2002

  24. Outer Conductor with Water Truss NBI 14-19 March 2002

  25. Water Drain Connection NBI 14-19 March 2002

  26. Water Nozzle Detail NBI 14-19 March 2002

  27. Twist Transitions NBI 14-19 March 2002

  28. Inner Conductor Before Welding NBI 14-19 March 2002

  29. Hand Scraping before Welding NBI 14-19 March 2002

  30. Welding Sample NBI 14-19 March 2002

  31. Large Weld NBI 14-19 March 2002

  32. Small Diameter Weld NBI 14-19 March 2002

  33. Inspecting the Small Diameter Weld NBI 14-19 March 2002

  34. Radiography of Weld NBI 14-19 March 2002

  35. Radiography of Large Weld NBI 14-19 March 2002

  36. Moving the Inner Conductor from The Welding Machine NBI 14-19 March 2002

  37. Inserting the Inner into the Outer Conductor NBI 14-19 March 2002

  38. Horn Testing • The horn was pulsed for the first time on 07/27/01. • The horn test was completed on 02/12/02 after completing 11M pulses at full current. • We completed horn magnetic field measurements. • Completed a series of vibration measurements. • Things we were monitoring: • Total current • Current in the four striplines feeding the horn • Total voltage • Cooling water supply and return temperatures • Horn temperatures NBI 14-19 March 2002

  39. Overview of MI-8 Test Area NBI 14-19 March 2002

  40. Horn module overview NBI 14-19 March 2002

  41. Stripline Configuration at the TSB NBI 14-19 March 2002

  42. Current and Voltage Profiles NBI 14-19 March 2002

  43. Horn Magnetic Field Measurement NBI 14-19 March 2002

  44. Horn Temperature Profiles with Different Sprayer Configurations NBI 14-19 March 2002

  45. Correlation between Horn and Water Return Temperatures NBI 14-19 March 2002

  46. Horn Vibration Spectrum NBI 14-19 March 2002

  47. Horn Axial Displacement vs. Time NBI 14-19 March 2002

  48. Horn Changeover • The horn module is expected to be highly radioactive (30 Rad/hr at 2 ft). • In order to reduce the Radiation Exposure to under 100 mR/hr at 1 ft, the shielding requirement is 5” of steel on all sides. • Because of the crane lifting capacity, two separate coffins (an inner and an outer ) will be used. • The inner coffin has 1.5’’ thick walls except from the top cover and the front door (5” thick). • The outer coffin has 3.5” thick walls and is open at the top and the front. NBI 14-19 March 2002

  49. Horn Changeover (2) • The radioactive horn module will be stored inside the two coffins in the Target Service Building in the old Proton Line. • Four coffins (two inner and two outer coffins) will be needed for a changeover. • A detailed procedure outlining all the steps for a changeover has been written and reviewed. • Total estimated time for a changeover is 2 weeks. NBI 14-19 March 2002

  50. Inner Coffin NBI 14-19 March 2002

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