Update of magnetic field measurements of sss correctors at 1 9 k
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Update of magnetic field measurements of SSS correctors at 1.9 K. W. Venturini Delsolaro AT-MTM Field Quality Working Group Meeting 3 May, 2005. Outline. Transfer Functions Hysteresis Field quality Program (proposal). Where we are: Update of last FQWG (16.11.04).

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Update of magnetic field measurements of sss correctors at 1 9 k
Update of magnetic field measurements of SSS correctors at 1.9 K

  • W. Venturini Delsolaro AT-MTM

    Field Quality Working Group Meeting

    3 May, 2005


Outline
Outline

  • Transfer Functions

  • Hysteresis

  • Field quality

  • Program (proposal)


Where we are update of last fqwg 16 11 04
Where we are: Update of last FQWG (16.11.04)


Sss correctors synoptic b4 sm18
SSS correctors: synoptic B4-SM18

Random errors and population spreads superimposed, and samples are different. 2 MO singled out…

Spreads about same in B4 and SM18

Different behavior with magnet order

Difference between two labs of same order as spread



Octupoles: larger hysteresis and smaller transfer functions (can’t be explained by calibration factors)


Landau octupoles hysteresis
Landau octupoles hysteresis (can’t be explained by calibration factors)


Residual octupole field at 0 a
Residual octupole field at 0 A (can’t be explained by calibration factors)

Tolerance ± 7.4 10-5


Field quality
Field Quality (can’t be explained by calibration factors)

  • No real c/w correlations yet

  • Spot-checks at cold on basis of industry measurements outcomes in general confirming the w.m., examples:

  • b3 in MCB, MCBC

  • b10 in MQT, MQTL

  • b1 in MO


High b1 in octupole modules confirmed in cold measurements
High b1 in octupole modules (can’t be explained by calibration factors) confirmed in cold measurements


Cold measurements plan proposal
Cold measurements plan (proposal) (can’t be explained by calibration factors)

GOALS

  • Measure excitation curves (hysteresis) down to very low currents for MCB, MQT, MS: close to likely settings.

  • Study behavior for small positive and negative increments (for FB loops).

  • Search for setting up cycles

  • Measure cross talks

  • Establish correlations between warm and cold for TF

    PROBLEMS

  • High workload and tight resources in 2005

  • MQTL integral measurements much easier in SM18

    ACTIONS

  • Recalibration of some B4 cold shafts (under way)

  • Program ongoing at B4 for TF, hysteresis, setting up, and cross talks from table Cham05. MQTL, MSCB, MCBY, and MQT are in the pipeline

  • Pursue measurements of TF at nominal current in SM18 for all SSS with measurement shaft (total 20). Compare with warm data from industry


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