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CHANGE OF D1 LENGTH AND FIELD

Geneva, 18 th February 2014 HiLumi Parameter and Layout Committe. CHANGE OF D1 LENGTH AND FIELD. E. Todesco CERN, Geneva Switzerland On behalf of T. Nakamoto , Q. Xu Paper published at MT, Boston 2013. BASELINE. D1 is the separation dipole Superconductive , Nb-Ti, large aperture

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CHANGE OF D1 LENGTH AND FIELD

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  1. Geneva, 18th February 2014 HiLumiParameter and LayoutCommitte CHANGE OF D1 LENGTH AND FIELD E. Todesco CERN, Geneva Switzerland On behalf of T. Nakamoto, Q. Xu Paperpublished at MT, Boston 2013

  2. BASELINE • D1 is the separation dipole • Superconductive, Nb-Ti, large aperture • Startedwith 160 mm aperture, thendecidedthat 10 mm more than quads was not neededafterebergydepositionstudies • 35 Tm required • 70% margin on the loadlinewaschosen, giving 5.2 T operationalfieldwith 15 mm one layer coil • Twolayersexcludedsincethismagnet has a lot of fringefieldalready Field veruscoilwidthin acceleratormagnets and models [E. Todesco, L. Rossi Malta workshop CERN 2011-003]

  3. VARIATIONS • The chosenmarginis large w.r.t. quadrupoles, which are in Nb3Sn and in similarregion for radiation and heatloads • Possible to decreasefrom 30% to 20-25% • At the same time the lengthcorresponding to 5.2 T and 35 Tm wasexceeding the vertical test station length at KEK • Study was carried out to explore the case of 25% margin and 20% margin • Options look viable, with increase of stress and fring field which appears to be tolerable [talk on 25 June 2013, T. Nakamoto and Q. Xu]

  4. threeOPTIONS AT 150 MM

  5. IMPACT ON FIELD QUALITY

  6. CONCLUSIONS • We propose to reduce the marginfrom 30% to 25%, i.e. increasing the operationalfieldfrom 5.2 to 5.6 T and reducinglengthfrom 6.7 to 6.3 m • Minimal change needed to fit the test station • Currentincreasefrom 11 to 12 kA

  7. SUMMARY

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