28 June 2015 to 2 July 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Measurements of YBCO pancake coils: thermal conductivity, quench, and NZP at 4.2 K and 10 T.

29 Jun 2015, 09:00
Exhibit Hall (Arizona Ballroom) ()

Exhibit Hall (Arizona Ballroom)

Poster Presentation ICMC-08 - Superconductor Stability and AC Losses M1PoA - Superconducting Materials and Applications


Dr Milan Majoros (The Ohio State University)


High energy physics (HEP) magnets require high magnetic fields, demanding the use of new superconducting materials. YBCO coated conductors are of interest in a number of possible HEP applications, including high field solenoids for muon colliders. The temperature distribution, quench, the normal zone propagation, and conductor protection are highly important in these applications. In the present work we have measured thermal conductivity, stability, and normal zone propagation in a YBCO pancake coil at 4.2 K in liquid helium bath. The experiments have been done in applied magnetic fields up to 10 T at transport currents of a certain percentage of the coil critical current. A pancake coil with 27 mm ID and 37 mm OD was measured. It was instrumented for voltage and temperature measurements at several places around the winding, such that both radial and azimuthal quench propagation could be measured. Several heaters were placed on the inner-most part of the winding. Thermal conductivity was measured by applying a steady heater power and measuring the temperature gradient. Heat pulses of various powers and durations were generated to measure quench and NZP. This work was performed on a “dry” winding; these results are baselines for comparisons of several different epoxy and insulation winding modes.

Primary author

Dr Milan Majoros (The Ohio State University)


Dr Christopher Kovacs (The Ohio State University) Prof. Edward Collings (The Ohio State University) Prof. Michael Sumption (The Ohio State University)

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