Correctors for the J-PARC Proton Beam Line

Peter WandererBNL Superconducting Magnet Div.

September 8, 2007T2K US B280 Collaboration Mtg.

600MeV Linac

3GeV PS

50GeV PS

N

FD

Neutrino Beam Line

To SKJHF NuMI(FNAL)

K2K

E(GeV) 50 120 12

Int.(1012ppp)

330 40 6

Rate(Hz) 0.27

0.53 0.45

Power(MW)

0.75

0.41 0.0052

JAERI@Tokai-mura(60km N.E. of KEK)

1021POT(130day)≡ “1 year”

Use Super Con.mag. in line

JHF project and neutrino beam line

11 February 2005 T2K proton line correctors 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

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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

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Coil Winding

Precision semi-automatic winding machine developed for other projects.

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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

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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.

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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!

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“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

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Forging in BNL Lathe

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Cost status

• Forgings– Estimated @ $3k each $15k total– Actual cost $28k

• BNL machine shop costs– Increased from $90/hr to $115/hr