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MQ cold data and W/C correlation on b6 (so far)

MQ cold data and W/C correlation on b6 (so far). L. Bottura, who has done nothing but collect data from: N. Smirnov, P. Schnizer, W. Venturini, and L. Li FQWG of January 8th, 2004. Injection b6 of MQ. focus on the main issue: the value of b 6 during injection

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MQ cold data and W/C correlation on b6 (so far)

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  1. MQ cold data and W/C correlation on b6 (so far) L. Bottura, who has done nothing but collect data from: N. Smirnov, P. Schnizer, W. Venturini, and L. Li FQWG of January 8th, 2004

  2. Injection b6 of MQ • focus on the main issue: the value of b6 during injection • the discussion here provides backup information for the specification of the change in geometric b6 (in collared coils) to achieve the desired range of b6 at injection • data source: • local measurements (25 cm) on 3 cold masses in vertical dewar • measurements on HCMQMG0000-AC000001 and HCMQMG0000-AC000007 • warm measurements on HCMQMG0000-AC000001 • calculation of change in geometric multipoles due to collaring

  3. Warm-cold change • Db6cc-cm collared-coil to cold mass change • Db6w-c warm-cold change • Db6pc persistent current at injection • note that the decay will decrease the apparent Db6pc

  4. Measured injection magnetization in vertical dewar • persistent current contribute on average a: • Db6 = -4 units @ 17 mm (± 0.4 units @ 17 mm) • Db6 = +0.09 units @ 17 mm (± 0.08 units @ 17 mm) data courtesy of W. Venturini, AT-MTM

  5. Average persistent current Db6 in AC000001 • measured persistent current contribution is Db6 = -3.5 to -4 units @ 17 mm b6 = 5.70 (units @ 17 mm) geometric Db6 ≈ 4 (units @ 17 mm) injection b6 = 1.70 (units @ 17 mm) data courtesy of N. Smirnov, P. Schnizer, L. Li, AT-MTM

  6. Average persistent current Db6 in AC000007 • measured persistent current contribution is Db6 = -3.3 to -4 units @ 17 mm b6 = 5.7 (units @ 17 mm) geometric Db6 ≈ 4 (units @ 17 mm) injection b6 = 1.7 (units @ 17 mm) data courtesy of N. Smirnov, P. Schnizer, L. Li, AT-MTM

  7. Summary of persistent current contribution to b6 • measurements in vertical dewar (Block-4) Db6pc = -4 ± 0.4units @ 17 mm • measurements in first two SSS’s (SM-18) Db6pc = -3.75 ± 0.3units @ 17 mm

  8. Warm-cold change • the warm-cold offset is small (< 0.05 units @ 17 mm) Db6w-c ≈ 0

  9. Calculated effect of collaring with iron • computed Db6cc-cm = -0.2…-0.3 units @ 17 mm B2/I = 0.3 T @ 17 mm/kA b6 = 4.15 units @ 17 mm B2/I = 0.32 T @ 17 mm/kA b6 = 3.92 units @ 17 mm

  10. b6 decay is “of the order of” 1 unit @ 17 mm large uncertainty 0.5 units noise ? self-criticism is in progress, purges may follow Decay of b6 at injection in AC000007

  11. Summary • change of b6 from collared coil to injection • Db6cc-cm = -0.25 units @ 17 mm • Db6w-c = 0 units @ 17 mm • Db6pc = -4 units @ 17 mm BOI: total Db6 ≈ -4.25 units @ 17 mm EOI: total Db6 ≈ -3.25 units @ 17 mm

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