117804340
DESIGN OF PROTON LINEAR ACCELERATORS FOR ENERGIES UP TO 300 Mev
Extension of the conventional 2 pi structure for particle acceleration to 200 Mev or higher requires minimization of power losses by optimizing cavity and drift-tube parameters. Using a previously developed method, an optimization of the cavity drift-tube dimensions was made at 200 Mc and at energies of 50, 100, 150, and 200 Mev to give minimum power losses for cylindrical tubes. Drift tubes of other shapes may reduce observed high-energy power losses due to currents in the drift-tube surface. Ellipsoidal tubes appear more efficient than the cylindrical tubes. (D.C.W.)
124960127
THE OPERATION OF THE FIRST SECTION OF THE NAL LINEAR ACCELERATOR.
115467134
OPERATION OF NAL LINAC AT ENERGIES TO 139 MeV.
55868408
400-MeV upgrade for the Fermilab linac
Fermilab plans to upgrade the Tevatron to expand the physics research program in both the fixed target and the collider operating modes. The first phase of this program is to increase the energy of the H{sup -} linac from 200 to 400 MeV in order to reduce the incoherent space change tuneshift at injection into the Booster which can limit either the brightness or the total intensity of the beam. The linac upgrade will be achieved by replacing the last four 201 MeV, with seven 805 MHz side-coupled cavity modules operating at an average axial field of about 8 MV/m. This will allow acceleration to 400 MeV in the existing Linac enclosure. 4 refs., 3 figs., 1 tab.
123057920
Magnetic Guide Field Measurements and Corrections in the MURA 50‐MeV Electron Accelerator. VI
Methods of measurement and correction of the magnetic fields of the MURA 50‐MeV electron accelerator are described. Measurements of the vertical and horizontal field components were made and the field errors corrected. Correction coils, iron shims, and adjustment of magnet positions were used to produce fields within the required tolerances. Computer methods were used to calculate needed corrections and to evaluate the quality of the corrections achieved.
210069014
Cooling Scenario Study Week
118446941
SU(2|2) for theories with sixteen supercharges at weak and strong coupling
archiveprefix: arXiv primaryclass: hep-th reportnumber: HU-EP-10-15 slaccitation: %%CITATION = ARXIV:1003.5547;%%
118984920
Hidden Local and Non-local Symmetries of S-matrices of N=2,4,8 SYM in D=2+1
This talk, based principally on [1], is devoted to properties of tree-level S-matrices of N = 2,4,8 SYM inD = 2 + 1. We’ll discuss an on-shell formalism for three-dimensional theories inspired by the spinor-helicityframework in four spacetime dimensions. Our framework will be shown be to particularly well suited for theextraction of hidden symmetries and algebraic structures that the scattering amplitudes of the three-dimensionaltheories posses. In particular we shall discuss the manifest SO(N) symmetry of the S-matrix to all orders inperturbation theory; a symmetry that the Lagrangians of these theories do not have. After a brief discussionof the ramiﬁcation of the SO(N) invariance to the D2 − M2 brane dualities, we shall introduce an on-shellsuperﬁeld framework for three-dimensional theories and end with a surprising hint of the existence of non-localsymmetries for the S-matrix of the N = 8 theory.
7242147
BPS Wilson Loops on S**2 at Higher Loops
archiveprefix: arXiv primaryclass: hep-th reportnumber: HU-EP-08-13 slaccitation: %%CITATION = ARXIV:0804.4098;%%
6991151
Wavy Wilson line and AdS / CFT
Wilson loops which are small deviations from straight, infinite lines, called wavy lines, are considered in the context of the AdS/CFT correspondence. A single wavy line and the connected correlation function of a straight and wavy line are considered. It is argued that, to leading order in "waviness," the functional form of the loop is universal and the coefficient, which is a function of the 't Hooft coupling, is found in weak coupling perturbation theory and the strong coupling limit using the AdS/CFT correspondence. Supersymmetric arguments are used to simplify the computation and to show that the straight line obeys the Migdal–Makeenko loop equation.
118678233
Scattering Amplitudes of Massive N = 2 Gauge Theories in Three Dimensions
We study the scattering amplitudes of mass-deformed Chern-Simons theories and Yang-Mills-Chern-Simons theories with N = 2 supersymmetry in three dimensions. In particular, we derive the on-shell supersymmetry algebras which underlie the scattering matrices of these theories. We then compute various 3 and 4-point on-shell tree-level amplitudes in these theories. For the mass-deformed Chern-Simons theory, odd-point amplitudes vanish and we find that all of the 4-point amplitudes can be encoded elegantly in superamplitudes. For the Yang-Mills-Chern-Simons theory, we obtain all of the 4-point tree-level amplitudes using a combination of perturbative techniques and algebraic constraints and we comment on difficulties related to computing amplitudes with external gauge fields using Feynman diagrams. Finally, we propose a Britto-Cachazo-Feng-Witten recursion relation for mass-deformed theories in three dimensions and discuss the applicability of this proposal to mass-deformed N = 2 theories.