Magnetization Measurements

1
Magnetization Measurements

• Cristian Boffo
• Emanuela Barzi, Joe Ozelis

2
Nb3Sn Sample

• Strand wound on tube before reaction
• Measurement with sample on Stainless steel tube
  slipped on G10 holder
• Bkground measured with tube slipped on G10 holder

3
Software Development
4
Magnetization axis
Equation without sample

• Equation with sample in

Subtraction
Balancing circuit effect R1 ? Rcomp2000 ?
Vin0.9995 EMF
5
Magnetization axis

• Final correction formula

Sample area
6
First Comparison

• IGC SR05-15 Four Split High Tin
• Goldfarb _at_ NIST measurement 16 less (coil
  config.)
• Sumption _at_ Ohio State Univ. measurement 296 more
  (straight config.)
• We expected an higher value than Goldfarb due to
• Higher filament diameter (1.4mm / 1 mm)
• lower Cu/not Cu ratio

7
System Calibration

• Send our tested sample to other calibrated
  facilities
• Evaluate slope during Meissner phase up to 0.1T
  (0.1 T/min)

Experimental slope value -0.6662 0.0037
(0.56) Expected slope value -1 Results
consistent with Goldfarb data on SR05-15
8
Conclusion

• Better resolution on Nb3Sn
• Calibration
• Correct magnetization axis unit
• Different measurements
• /- 2T
• from 0T to 3T (probably stable up to 4T)
• from 10T to 13T
• AC losses measurement
• Eddy current effect