136296280
Characteristics of round and extracted strands of Nb3Al Rutherford cable
Long Nb{sub 3}Al strands with copper stabilizer are promising for future high field accelerator magnets. A 1.2 kilometer Nb{sub 3}Al strand with Cu stabilizer was fabricated at the National Institute for Materials Science in Japan. Using this strand a 30 meter Cu stabilized Nb{sub 3}Al Rutherford cable was made for the first time by a collaboration of NIMS and Fermilab. The Nb{sub 3}Al strands extracted from cable with a relatively low packing factor showed almost no J{sub c} degradation. But the extracted strands from the highly compacted cable showed some degradation in both J{sub c} and n value, which may be caused by local separation of the copper stabilizer. Still, its J{sub c} degradation is lower than that of typical Nb{sub 3}Sn strands. The current limit due to magnetic instability in low field is about 500 A at 4.2 K. The magnetization of the strands, which was measured with balanced coils at 4.2 K, showed large flux jumps, usually around 1.5 T. This value is much larger than the B{sub c2} (4.2 K) of the Nb matrix, which is around 0.4 Tesla. The magnetic instability of the Nb{sub 3}Al strand at low field is not completely understood, but it might be explained by the superconducting coupling current through the Nb matrix.
215736286
STATUS AND PERSPECTIVE OF THE NB3AL DEVELOPMENT IN JAPAN
The RHQT process enables to form a stoichiometric Nb3Al with fine-grain structures via a bcc supersaturated solid solution and so that a large Jc is achieved over the whole range of magnetic fields without trading off the excellent strain tolerance. A long-length of RHQ processing has been established, and a rectangular but Cu stabilized Nb3Al strand is about to be commercially available for NMR uses. Another stabilization technique has been developed and likely applicable to accelerator uses. Research activities at the KEK with respect to the low field Jc characterization are also described.
1637482
Constraints on New Physics from Long Baseline Neutrino Oscillation Experiments
New physics beyond the Standard Model can lead to extra matter effects on neutrino oscillation if the new interactions distinguish among the three flavors of neutrino. In a previous paper [1], we argued that a long-baseline neutrino oscillation experiment in which the Fermilab-NUMI beam in its high-energy mode [2] is aimed at the planned Hyper-Kamiokande detector [3] would be capable of constraining the size of those extra effects, provided the vacuum value of sin 2 2θ23 is not too close to one. In this paper, we discuss how such a constraint would translate into limits on the coupling constants and masses of new particles in various models. The models we consider are: models with   
117490007
Constraints on New Physics from Matter Effects on Neutrino Oscillation
archiveprefix: arXiv primaryclass: hep-ph reportnumber: VPI-IPPAP-06-06 slaccitation: %%CITATION = HEP-PH/0610281;%%
119989444
Future constraints on and from lepton universality
In the near future, experimental constraints on charged current (CC) lepton universality can be expected to improve dramatically. First, the PIENU experiment at TPIUMF and the PEN experiment at PSI aim to improve the bound on the ratio by almost an order of magnitude. Second, by analyzing existing data, the Belle experiment aims to improve the bound on the ratio by a factor of three. Further improvements can be expected by analyzing the τ decays in existing Belle data. There also exist a large amount of unanalyzed W decay data from the Tevatron. These new bounds will place very tight constraints on possible new physics beyond the Standard Model. For example, the 95% bounds on R-parity violating couplings will be improved as follows: These limits will be very difficult to improve further, even with future high statistics neutrino experiments such as NuSOnG [1]. However, for certain types of new physics, the combination of CC lepton universality data and NuSOnG will have a dramatic effect. I demonstrate this using a model in which neutrino mixing with heavy gauge singlet states suppress both the CC and NC neutrino couplings.