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Comparison between radiation hardness of Bi2Sr2Ca2Cu3Ox tapes and MgB2 tapes and films

Danilo Botta 1Angelica Chiodoni 1Roberto Gerbaldo 1Gianluca Ghigo 1Laura Gozzelino 1Francesco Laviano 1Bruno Minetti 1Enrica Mezzetti 1Roberto Cherubini 2Alberto Rovelli 3Antonino Amato 3Giovanni Giunchi 4Eugenio Monticone 5

1. Dipartimento di Fisica, Politecnico di Torino, Italy, corso Duca degli Abruzzi, 24, Torino 10129, Italy
2. INFN - Laboratori Nazionali di Legnaro, Italy (INFN-LNL), Viale dell'Università 2, Legnaro (Pd) 35020, Italy
3. INFN - Laboratori Nazionali del Sud, Italy (INFN-LNS), via Santa Sofia, 62, Catania 95123, Italy
4. EDISON S.p.A., Italy, Foro Buonaparte, 31, Milano 20121, Italy
5. Istituto Elettrotecnico Nazionale "Galileo Ferraris", Italy (IEN), Strada delle Cacce, 91, Torino 10135, Italy


In this work we present a wide spectrum of ac/dc magnetic and magneto-optical characterizations of Bi2Sr2Ca2Cu3Ox (BSCCO) tapes and MgB2 tapes, before and after irradiation by means of high energy ions. The fluences were about 1011 ions/square centimeter. BSCCO tapes were irradiated up to 15% of their thickness by means of 0.25 GeV gold ions (Tandem facility energy ); the penetration depth was evaluated by TRIM simulations. In such tapes there is a decrease of critical temperature of about 0.5 K [1,2,3]; a large sensitivity to the high energy ions is exhibited, showing up in a significant enhancement of critical currents as well as in a large shift of the irreversibility line towards high temperatures (clear signatures of Bose-glass-like transition are present).
MgB2 tapes were irradiated with 0.25 GeV but the damaging effect was within experimental errors. In order to reach the maximum damaging effect, if present, the gold ions energy was increased up to 4.5 GeV (gold ions, CS-facility energy). TRIM simulations allow to establish that in this case the ions cross about 100% of the sample thickness. No significant changes were found in the useful range of temperatures. Thus MgB2 bulk exhibits a quite remarkable radiation hardness [4] with respect to high energy ions. The same hardness is exhibited by MgB2 films under low energy monochromatic protons of 3.5 MeV up to fluences of 1016 p/cm2.
This scenario points towards radiation hardness of MgB2 as a valuable figure of merit with respect to application of this material in hard ambient.

This work was partially supported by Istituto Nazionale di Fisica Nucleare, Italy (MaBo project)

[1] E. Mezzetti, L. Gherardi et al., Phys. Rev. B 59, (1999) 3890
[2] L. Gherardi, P. Caracino et al., Mater. Sci. Eng. B 39, (1996) 66
[3] L. Martini, S. Zannella et al., Physica C 261, (1996) 196
[4] G. Ghigo, B. Minetti et al., IEEE Trans. Appl. Supercond. 13, (2003) 3518


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Presentation: poster at E-MRS Fall Meeting 2004, Symposium E, by Danilo Botta
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-29 13:36
Revised:   2009-06-08 12:55