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IPNS Third RF Cavity Status Report

IPNS Third RF Cavity Status Report. G.E. McMichael Accelerator Facilities Manager. Presentation at the Ninth SHRF/LOIA Collaboration Meeting June 14, 2004. IPNS ACCELERATOR OVERVIEW. Accelerator delivers a short (70 ns) intense

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IPNS Third RF Cavity Status Report

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  1. IPNS Third RF Cavity Status Report G.E. McMichael Accelerator Facilities Manager Presentation at the Ninth SHRF/LOIA Collaboration Meeting June 14, 2004

  2. IPNS ACCELERATOR OVERVIEW • Accelerator delivers a short (70 ns) intense (3 x 1012 protons/pulse) pulse of 450 MeV protons to the depleted-uranium target 30 times per second • Each proton produces about 15 neutrons • IPNS is a user facility. Sole purpose of the accelerator is to produce neutrons (99% for the neutron-scattering instruments in Bldg. 375, remainder for an “exotic-beam” source for ATLAS)

  3. IPNS ACCELERATOR FACILITY • Three accelerators in series • 750 keV Preaccelerator • 50 MeV Linac • 450 MeV Rapid Cycling Synchrotron (RCS) • Ancillary Systems • RF (Variable Frequency Beam Feedback controlled) • Magnets and power supplies (Pulsed & DC) • Control, diagnostics and data acquisition • Vacuum • Safety (Personnel & Equipment) • Buildings and Utilities • AC Power • Water Systems • Air Conditioning

  4. HISTORY • Preaccelerator and linac entered service in 1961 as injector to the 12.5 GeV ZGS (Zero Gradient Synchrotron) high-energy physics accelerator • RCS developed in mid 1970's as a proposed booster for ZGS. Excess beam would have been available for a spallation neutron source • ZGS was shut down in 1979. RCS initially (1977-1980) provided beam into the ZING experimental target. First beam to IPNS target was in 1981 • Eight-billionth pulse 16 April, 2004

  5. ION SOURCE & PREACCELERATOR • Magnetron-type H- ion source, cesium getter • Extraction at 20 keV, magnet to separate electrons • Cockcroft-Walton generator, 750 Kv • Output H- beam, 30 mA peak, 70 µs pulses, 30 Hz

  6. LINAC • Alvarez-type “drift-tube linac” • Copper-clad steel tank, 33.5 m long, 0.93 m diameter • 124 drift tubes, each with a dc quadrupole magnet • 200 MHz rf transmitter, triode amplifier tube, 3.5 MW • Output H- beam 50 MeV, 10 mA peak, 70 µs pulses, 30 Hz

  7. 50 MEV TRANSPORTATION LINE • 8 Dipole horizontal bending magnets • 6 Dipole vertical steering magnets • 16 Quadrupole focusing magnets • 12 Wire scanners, 6 Beam position monitors • Transports H- beam ≈ 40 m from linac to RCS

  8. RAPID CYCLING SYNCHROTRON “ RCS” • 43 m circumference strong-focusing, combined-function synchrotron • 6-sector machine, magnet structure D00FDF0 • Betatron tune correction provided by two pairs of sextupole magnets • Multi-turn injection ( 130 turns, “3 mile string”) • Single-turn extraction by two ferrite-loaded kicker magnets and two septum magnets

  9. RAPID CYCLING SYNCHROTRON “ RCS” • Ring magnets are part of a biased 30 Hz resonant circuit. Generate a magnetic field that varies from 0.28 to 1 Tesla during the accelerating cycle • Thin carbon foil strips off the two electrons • Two rf cavities to bunch and accelerate the proton beam • Third rf cavity will be installed in L6 section • Output proton beam 450 MeV, 70-80 ns pulse, 30 Hz, 3 x 1012 protons/pulse

  10. PTS BEAMLINE • 4 Dipole horizontal bending magnets • 2 Dipole vertical steering magnets • 15 Quadrupole focusing magnets • 6 Segmented secondary emission monitors, 1 Segmented wire ion chamber • Transports H- beam ≈ 45 m from RCS to neutron-generating target

  11. ACCELERATOR OPERATIONS OPERATING PERIODS • Typically two to four weeks on and one to two weeks off • Six-hours reserved each Tuesday for machine research and moderator regeneration • Two longer shutdowns (Christmas and summer) for installations and larger maintenance jobs

  12. THIRD RF STATION • Cavity almost identical to two existing • Redesigned rf amplifier systems: • Pre-driven and final use new tubes • Driver is an updated version of existing systems • New low-level system • Provide second-harmonic rf for capture and initial acceleration • Provide additional fundamental at mid-cycle • Can function as on-line spare for existing fundamental systems • Installation to start in 6 months

  13. 2nd – HARMONIC RF • Propose to enhance 3rd rf system to operate at 2nd harmonicthroughout the acceleration cycle • Principal addition will be a new cavity with different ferrite • Funding and schedule uncertain

  14. SUMMARY • IPNS continues to have a moving 10-year window – to ensure reliable operation for the next 10 years • Recent budget problems have slowed the upgrade/assurance program. • Our interest in the collaboration remains strong - Shaoheng Wang will be joining our program

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