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Analysis of Cold Data and Warm/Cold Correlation on B6 in B6 Accelerator

This research delves into the correlation between cold data and warm/cold changes in B6 accelerator components, providing insights into achieving desired geometric parameters for injection. Detailed measurements and calculations by experts are presented, shedding light on persistent current contributions and decay effects.

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Analysis of Cold Data and Warm/Cold Correlation on B6 in B6 Accelerator

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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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