Abstract
We present here the development of a facility to generate high (multi megagauss) magnetic field of 4 to 5µs rise time, using inertial magnets. The facility includes a low inductance, high current capacitor bank (280 kJ/40 kV) and an inertial magnet, which is a copper disk machined to have a keyhole in it. As the high current from the capacitor bank is discharged through the copper disk, a high magnetic field is produced along its axis, before it is destroyed by the combined effect of the dynamic loading and skin effect. A maximum peak magnetic field of 257 T is realized, when the magnet with 3.6mm inner diameter, 35mm outer diameter and 5mmlength, is powered by the capacitor bank charged to 28 kV (134 kJ). The transient magnetic field is measured using a B dot probe with an error of ±25 T. The probe in most of high field shots (> 200 T) got destroyed before recording the peak field and the trailing edge of the magnetic field. Experimental evidence of enhancement of the probe survival for longer time in copper disks using spatial non-uniform conductivity with 1mm thick SS brazed to the inner wall of the inertial magnet is also reported.
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References
Frings Paul H, Luc Van Bockstal 1995 Strength versus conductivity. Physics B 211: 73–76
Furth H P, Waniek RW 1956 Production and use of high transient magnetic fields I. Rev. Sci. Instrum. 27(4): 195–203
Furth H P, Levine M A, Waniek R W 1957 Production and use of high transient magnetic fields II. Rev. Sci. Instrum. 28(11): 949–958
Knoepfel H 1970 Pulsed magnetic fields (Amsterdam and London: North Holland Publishing Company)
Miura N, Herlach F 1985 Pulsed strong and ultra strong magnetic fields—Applications of strong and ultra strong magnetic fields (Topics in Applied physics Vol. 57) (Heidelberg: Springer)
Portugall O, Puhlmann N, Muller H U, Barczewski M, Stolpe I, Von Ortenberg M 1999 Mega gauss magnetic field generation in Single-turn coils: New frontiers for scientific experiments. J. Phys. D: Appl. Phys. 32: 2354–2366
Shearer JW 1969 Interaction of the capacitor bank produced mega gauss fields with small single turn coils. J. Appl. Phys. 40(11): 4490–4497
Shneerson GA, Sergey I Krivosheev 2004 Development and achievements in single turn coil technique. Mega gauss X Berlin, Germany
Singleton J 2004 The national high magnetic pulsed field facility at Los Alamos National Laboratory. Physica B 346: 614–617
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Nalini, N., Kaushik, T.C. & Gupta, S.C. Generation and measurement of multi megagauss fields in inertial magnets. Sadhana 35, 547–556 (2010). https://doi.org/10.1007/s12046-010-0034-9
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DOI: https://doi.org/10.1007/s12046-010-0034-9