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The MiniBooNE Horn

The MiniBooNE Horn

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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