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SUMMARY:FNAL Conductor Development for the 11 T Dipole Program
DTSTART;VALUE=DATE-TIME:20120301T130000Z
DTEND;VALUE=DATE-TIME:20120301T140000Z
DTSTAMP;VALUE=DATE-TIME:20130619T182421Z
UID:indico-event-180593@cern.ch
DESCRIPTION:For the second phase of the LHC collimation system upgrade\, w
 ith beam operation at nominal and ultimate intensities\, Fermilab and CERN
  have started the development of 11 T Nb3Sn dipoles 11 m long to replace a
  few longer Nb-Ti dipoles and free space for cold collimators in the LHC d
 ispersion suppression areas. An important step in the design of these magn
 ets is the development of the high aspect ratio Nb3Sn cable to achieve 11 
 T at the nominal LHC operating current of 11.85 kA with 20% margin. The de
 sired goal is of producing nominal cable both at FNAL and at CERN. \nUsing
  FNAL two-step cable fabrication technology\, a number of cable design stu
 dies were performed to finalize cable specifications. This included the ef
 fect of the number of strands on the cable parameters\, the sensitivity of
  electrical properties to cable compaction\, measurements of cable expansi
 on during reaction\, and the effect of intermediate annealing between the 
 two cable fabrication steps. The cable optimization process was aimed at a
 chieving both mechanical stability and minimal damage to the internal arch
 itecture of the Restacked-Rod Process (RRP®) Nb3Sn strands to be used in 
 the magnet short models. Both the 108/127 RRP wire\, which is presently a 
 baseline conductor for Nb3Sn magnet R&D in the US\, and a new 150/169 RRP 
 wire were used for the cable optimization studies. In particular\, the 150
 /169 RRP wire was used to develop a 40-strand cored cable technology\, and
  in fabrication of 300 m of cable with stainless steel core for an 11 T di
 pole short model. Strand and cable studies included electrical characteriz
 ation of transport properties at high fields and of flux jumps stability a
 t low fields\, magnetization measurements\, metallographical analyses of i
 nternal damage and ANSYS finite element modeling.\n\nhttp://indico.cern.ch
 /conferenceDisplay.py?confId=180593
LOCATION:CERN
URL:http://indico.cern.ch/conferenceDisplay.py?confId=180593
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