Publication Details

Tajima, T, Canabal, A, Zhao, Y, Romanenko, A, Moeckly, B, Nantista, CD, Tantawi, S, Phillips, L, Iwashita, Y & Campisi, IE (2007), MgB2 for Application to RF Cavities for Accelerators, IEEE Transactions on Applied Superconductivity, 17(2), pp. 1330-1333.


Magnesium diboride (MgB2) has a transition temperature (Tc) of ~40 K, i.e., about 4 times as high as that of niobium (Nb).We have been evaluating MgB2 as a candidate material for radio-frequency (RF) cavities for future particle accelerators. Studies in the last 3 years have shown that it could have about one order of magnitude less RF surface resistance (Rs) than Nb at 4 K. A power dependence test using a 6 GHz TE011 mode cavity has shown little power dependence up to ~12 mT (120 Oe), limited by available power, compared to other high-Tc materials such as YBCO. A recent study showed, however, that the power dependence of Rs is dependent on the coating method. A film made with on-axis pulsed laser deposition (PLD) has showed rapid increase in Rs compared to the film deposited by reactive evaporation method. This paper shows these results as well as future plans.



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