Superconducting Corrector Magnet Progress Report

P. Wanderer

Superconducting Magnet Div;

Dec. 15, 2007

T2K US B280 collaboration meeting

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• #1, #2 – January, February• #3 – may be later (depends on #1, #2 actual

schedule)• #4 – spare more flexible schedule

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

Coil Winding

Precision semi-automatic winding machine developed for other projects.

Winding the 1st magnet

Corrector Status

#1: test completed 12/11 – magnet ok

#2: construction completed

#3: 3 of 4 layers have been wound

#4: copper support tube insulated

Completed magnet

First magnet under test

#1 – test results, next steps

• Operating current: 43A

• Test results: both coils reached max test current (60A) powered separately and together in both configurations without quenching.

• Next: warm measurements (finish by 12/31). The shipping crate has been built.

$ and ¥

¥: KEK to pay $140,000 toward correctors in exchange for equal purchases by T2K in Japan (1 2 correctors)

$: $190,000 loan from BNL HEP program for R&D magnets

$: T2K DOE construction funds will repay BNL HEP and cover the remaining construction cost

Administrative Summary

• No major cost overruns or schedule slippage