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Correctors for the J-PARC Proton Beam Line

Correctors for the J-PARC Proton Beam Line. Peter Wanderer BNL Superconducting Magnet Div. September 8, 2007 T2K US B280 Collaboration Mtg. N. 50GeV PS. 3GeV PS. Neutrino Beam Line. 600MeV Linac. FD. To SK. JHF project and neutrino beam line. JAERI@Tokai-mura (60km N.E. of KEK).

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Correctors for the J-PARC Proton Beam Line

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  1. Correctors for the J-PARC Proton Beam Line Peter Wanderer BNL Superconducting Magnet Div. September 8, 2007 T2K US B280 Collaboration Mtg.

  2. N 50GeV PS 3GeV PS Neutrino Beam Line 600MeV Linac FD To SK JHF project and neutrino beam line JAERI@Tokai-mura (60km N.E. of KEK) Use Super Con. mag. in n line 1021POT(130day)≡ “1 year”

  3. What’s Needed Dipole correctors: • Corrector = vertical + horizontal windings, one wound over the other • Three correctors to install + two spares • Overall Schedule: • Prototype (= 1 spare) now at KEK • Remaining four at JAERI by Dec. 31, 2007 • three months earlier than previously stated. • Change in schedule is due to revised estimate of installation plans T2K proton line correctors

  4. Corrector Parameters - NbTi superconducting wire, 0.33 mm Ø (used for RHIC correctors) • Bdl = 0.1 T·m; Lmagnetic = 522 mm • Bpeak = 0.2 T, Bquench > 6T  Significant temperature margin for operation • Iop = 43A • Inner diameter = 150 mm • Slot length = 800 mm • Located between main magnets  conduction cooling  thick-walled Cu tube T2K proton line correctors

  5. Coil Winding Precision semi-automatic winding machine developed for other projects. T2K proton line correctors

  6. Test Results of Prototype • 4.5 K, liquid helium • Test coil only (yoke added by KEK) • Test to ± 90A to obtain same field as will be produced at 43A with yoke on. • Reached 90A without quenching  excellent performance. • Measure integral fields, field uniformity across aperture  ok T2K proton line correctors

  7. Cost • Cost basis: • Prototype construction • Construction of similar magnets for HERA collider at DESY and BEPC upgrade • Correctors – four - production, testing, shipment to Japan: $500k • Includes 13% contingency, all overheads. T2K proton line correctors

  8. Progress Report • “Early” (i.e., “just in time”) start made possible by Stony Brook: • Copper forgings (cylindrical support tubes) ordered by Stony Brook • 1 forging rec’d by BNL, machining starts Monday • 4 forgings shipped to BNL yesterday • $120k advance funding to BNL from Stony Brook Research Foundation • Thanks to Chang Kee and Joan! T2K proton line correctors

  9. “Just in time” • Technical: BNL has two automatic winding machines (not identical) • Had planned to use just one • Will use both to meet schedule • Financial: “no delays due to $”  • Advance for remainder of budget (DOE requires “no working ahead of funding”) • Prompt billing by BNL • Prompt payment by Stony Brook/NY state T2K proton line correctors

  10. Forging in BNL Lathe T2K proton line correctors

  11. Cost status • Forgings • Estimated @ $3k each  $15k total • Actual cost $28k • BNL machine shop costs • Increased from $90/hr to $115/hr T2K proton line correctors

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