1662741
D-brane interactions in type IIB plane-wave background
The cylinder diagrams that determine the static interactions between pairs of Dp-branes in the type IIB plane wave background are evaluated. The resulting expressions are elegant generalizations of the flat-space formulae that depend on the value of the Ramond-Ramond flux of the background in a non-trivial manner. If each of the interacting D-branes separately preserves half the supersymmetries, the closed-string and open-string descriptions consistently transform into each other under a modular transformation. These results are derived for configurations of euclidean signature D(p+1)-instantons but also generalize to lorentzian signature Dp-branes.
9607753
Anomalous creation of branes
In certain circumstances when two branes pass through each other a third brane is produced stretching between them. We explain this phenomenon by the use of chains of dualities and the inflow of charge that is required for the absence of chiral gauge anomalies when pairs of D-branes intersect.
121755839
PHASE CONTOURS AND BOOTSTRAPS. I.
121062482
N=4 Yang-Mills and N=8 Supergravity as Limits of String Theories
The formulation of supersymmetric string theories in ten dimensions is generalized to incorporate compactified dimensions. Expressions for the one-loop four-particle S -matrix elements of N = 4 Yang-Mills and N = 8 supergravity in four dimensions are obtained by studying the string-theory loop amplitudes in the limit that the radii of the compactified dimensions and the Regge slope parameter simultaneously approach zero. If certain patterns that emerge should persist in the higher orders of perturbation theory, then N = 4 Yang-Mills in four dimensions would be ultraviolet finite to all orders, whereas N = 8 supergravity in four dimensions would have ultraviolet divergences starting at three loops.
123230985
Off-shell states in the dual model
Abstract We present a class of Lorentz invariant, gauge invariant off-shell amplitudes for the ordinary Veneziano and Ramond-Neveu-Schwarz dual models. They correspond to interactions with the string which are local in space-time.
120539667
Anomaly cancellations in supersymmetric D = 10 gauge theory and superstring theory☆
Abstract Supersymmetric ten-dimensional Yang-Mills theory coupled to N = 1, D = 10 supergravity has gauge and gravitational anomalies that can be partially cancelled by the addition of suitable local interactions. The remaining pieces of all the anomalies cancel if the gauge group is SO(32) or E 8 × E 8 . These cancellations are automatically incorporated in the type I superstring theory based on SO(32). A superstring theory for E 8 × E 8 has not yet been constructed.
54492459
Design parameters for a 7.2 tesla bending magnet for a 1.5 GeV compact light source
This report describes the design for a 7.2 tesla superconducting dipole magnet for a compact synchrotron light source. The proposed magnet is a Vobly type modified picture frame dipole that has the flux returned through unsaturated iron. In this magnet, the iron in the pole pieces is highly saturated. Separately powered coils around the pole pieces are used to direct the flux lines until the flux can be returned through the unsaturated iron. The proposed dipole will develop a uniform field over a region that is 80 mm high by 130 mm wide over a range of central induction from 0.4 T to almost 8 T. Each dipole for the compact light source will have a magnetic length of about 0.38 meters.
117480318
High field solenoids for muon cooling
I LBNL-44189 SC-MAG-688 High Field Solenoids for Muon Cooling M. A. Green a , Y. Eyssa b , S. Kennyb, J. R. Miller b and S. Prestemon b a Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA b National High Magnetic Field Laboratory, Tallahassee FL 32310, USA September 1999 Fourth European Conference on Applied Superconductivity Sitges, Spain, 14 through 17 September 1999 To be Published in the EUCAS-99 Proceedings This work was performed at the Lawrence Berkeley National Laboratory with the support of the Director, Office of Science, U. S. Department of Energy under Contract No. DE-AC03- 76SF00098.
121004261
A burnout safety condition for superconducting magnets and some of its applications
From the time evolution of the current in a superconducting coil during a quench, an upper limit can be computed for the temperature reached anywhere in the coil. A condition under which the danger of burnout is eliminated is derived here. It is used to show how the tests of superconducting magnets can be made safe against burnout and it provides constraints for the design of some type of magnets.
54892068
GROUND PLANE INSULATION FAILURE IN THE FIRST TPC SUPERCONDUCTING COIL
mm I UNIVERSITY OF CALIFORNIA LBL-12326 C Q k A • V.IL . V U . I Lawrence Berkeley Laboratory Engineering & Technical Services Division To b e p r e s e n t e d a t t h e 7 t h I n t e r n a t i o n a l C o n f e r e n c e on Magnet T e c h n o l o g y , K a r l s r u h e , West Germany, March 3 0 - A p r l l 3 , 1 9 8 1 ; and t o be p u b l i s h e d In t h e P r o c e e d i n g s GROUND-PLANE INSULATION FAILURE IN THE FIRST TPC SUPERCONDUCTING COIL M.A. G r e e n , P . Del P i e r r e , K. D e r b y , J . M . D u O l i v a r e s , P . H . E b e r h a r d , B . T . F u l t z , R.D. G i a u q u e , G.H. G i b s o n , F . S . G o u l d i n g , J . I . Kim, P . S . M a r t i n , J . W . M o r r i s , M. P r i p s t e i n , R.R. R o s s , M.D. S h a p i r o , E.G. S m i t s , and J . D . T a y l o r March Prepared for the U.S. Department ot Energy under Contract W-7405-ENG-4B MsmiurtoN OF THIS n u r is WIUUTEO
122023958
Tests on large diameter superconducting solenoids designed for colliding beam accelerators
Two prototype large diameter thin coil solenoids which use the mechanical structure to moderate quenches, have been built and systematically tested. The solenoids are cooled by two phase helium flowing in tubes which form a part of the coil structure. The coils have been tested by inducing a series of quenches at various currents. The results of these tests are given in this paper.