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Calorimetric method of ac loss measurement in a rotating magnetic field
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10.1063/1.3458003
/content/aip/journal/rsi/81/7/10.1063/1.3458003
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/7/10.1063/1.3458003

Figures

Image of FIG. 1.
FIG. 1.

Principle of calorimetric measurement.

Image of FIG. 2.
FIG. 2.

The schematic arrangement showing the experimental setup.

Image of FIG. 3.
FIG. 3.

Schematic diagram showing the test rig rotated up to a speed of 2100 rpm (35 Hz) and generate magnetic field of 0.35 T at the magnet center.

Image of FIG. 4.
FIG. 4.

The inner vessel cold finger with the sample holder mounted along with the diagnostic wiring.

Image of FIG. 5.
FIG. 5.

Temperature profile during sample holder calibration with a heater mounted on the sample holder.

Image of FIG. 6.
FIG. 6.

The calibration curve between the temperature rise and fixed heat load applied to sample holder only (without samples) at 80 K.

Image of FIG. 7.
FIG. 7.

Sample holder temperature profile when exposed to a peak field of 0.23 T and rotated at 1800 rpm (30 Hz) without any sample mounted.

Image of FIG. 8.
FIG. 8.

The calibration curve between temperature rise and fixed heat load in copper sample at 80 K.

Image of FIG. 9.
FIG. 9.

Variation in temperature rise against frequency with varied from 0.07 to 0.23 T in copper sample.

Image of FIG. 10.
FIG. 10.

ac loss in copper sample to establish the loss measurement technique at 80 K

Image of FIG. 11.
FIG. 11.

Temperature rise due to total ac loss in sample 1 when exposed to rotating magnetic field at 84 K.

Image of FIG. 12.
FIG. 12.

Temperature rise due to total ac loss in sample 1 neutralized when exposed to rotating magnetic field at 84 K.

Image of FIG. 13.
FIG. 13.

The calibration curve obtained to establish temperature rise in (a) the sample holder only with open symbols and (b) sample holder with the sample 1-neutralized with solid symbols against a fixed heat load.

Image of FIG. 14.
FIG. 14.

Total ac loss in sample 1 HTS YBCO-123 coated conductor.

Tables

Generic image for table
Table I.

Brief summary of rotating magnet assembly.

Generic image for table
Table II.

Samples used in the measurement of ac losses and calibrating the test rig.

Generic image for table
Table III.

Sample 1 temperature rise with frequency at 0.1 T.

Generic image for table
Table IV.

Heat load worked out due to temperature rise.

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/content/aip/journal/rsi/81/7/10.1063/1.3458003
2010-07-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Calorimetric method of ac loss measurement in a rotating magnetic field
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/7/10.1063/1.3458003
10.1063/1.3458003
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