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Inconsistencies in the MQY Transfer Function: Analysis and Recommendations

This report discusses the significant inconsistencies observed in the MQY transfer function, highlighting a spread of 50 units found in FiDeL, contrary to previous works which reported 10-12 units. Measurement discrepancies are attributed to a combination of construction tolerances and the effects of high permeability collars. A detailed comparison of data reveals notable anomalies, with actions recommended to revise and correct the transfer function as necessary. The implications of these inconsistencies, particularly at squeeze conditions, are also addressed.

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Inconsistencies in the MQY Transfer Function: Analysis and Recommendations

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  1. CERN, 7th August 2012 LBOC INCONSISTENCIES IN THE MQY TRANSFER FUNCTION P. Hagen, E. Todesco CERN, Geneva Switzerland

  2. INCONSISTENCY IN MQY TRASFER FUNCTION • In general a superconductingmagnettrasferfunction has a spread of 5-15 units • Typically 10 units – due to construction tolerances • 12 units in the 400 MQ • 11-12units in the MQM • 6 in the MQXB • For the MQY we have in FiDeL 50 units • Found by S. Fartoukh, studycarried out by Per • Non consistent withpreviousworks • Memo giving 12 units[P. Hagen, E. Todesco, EDMS no. 879594, (2007)] • ASC paper giving 8-9 units [N. Catalan Lasheras, B. Auchmann, G. Kirby, K.-H. Mess, R. Ostojic, and S. Russenschuck, IEEE Trans ApplSupercond 18 (2008)]

  3. INCONSISTENCY IN MQY TRASFER FUNCTION • Large spread due to a non negligible fraction of outliers • Having 0.5-1% more transferfunction

  4. INCONSISTENCY IN MQY TRASFER FUNCTION • MQY hadtwofeatures • Part measuredat SM18, part onlyat room temperture • Part of the magnetsaffected by high permeabilitycollars (visible effectat room temperature, disappearsat 4.2 K) • Inconsistenciespresentboth in some cases with WM only, and in cases with 4.2 K test • The WM (uncorrected) had a spread of 23 units, 13 after correction

  5. ACTIONS • Revised table of transferfunctionsbuilt, and differences w.r.t. presentFiDeL data wereworked out by Per • Rogeliofoundconsistency in many cases with the beambased corrections of beta beating

  6. CONCLUSIONS AND ACTIONS • Clearsign of inconsistency of MQY TF model • Relevant (1% errors on TF of some MQY – i.e. errordifferentfrom beam1 to beam2 – becomesvery relevant at squeeze) • Presentlypartiallycorrected by beambased beta beating corrections • Correction of FiDeLneeded • Now or in LS1?

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