55614129
Codes and supersymmetry in one dimension
Adinkras are diagrams that describe many useful supermultiplets in D=1 dimensions. We show that the topology of the Adinkra is uniquely determined by a doubly even code. Conversely, every doubly even code produces a possible topology of an Adinkra. A computation of doubly even codes results in an enumeration of these Adinkra topologies up to N=28, and for minimal supermultiplets, up to N=32.
17725107
Adinkras for Clifford Algebras, and Worldline Supermultiplets
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x ABSTRACT Adinkras are a graphical depiction of representations of the N-extended super- symmetry algebra in one dimension, on the worldline. These diagrams repre- sent the component elds in a supermultiplet as vertices, and the action of the supersymmetry generators as edges. In a previous work, we showed that the chromotopology (topology with colors) of an Adinkra must come from a doubly even binary linear code. Herein, we relate Adinkras to Cliord
56573720
DEVELOPMENT OF THE DUAL-SLOT RESONANCE LINAC*
We present the development of a novel electron accelerating structure with strong cell-to-cell coupling. The coupling is provided by a pair of resonant slots, separated by a non-resonant void region, located within the wall between adjacent cells. The 10+2/2 cell standingwave structure, operating in a phase and amplitude stabilized π/2 mode, will provide an energy gain of 10 MeV.
108610387
Simulations of the laser photocathode injector
New, fully electromagnetic simulations of the beam optics in a laser-photocathode injector have been make using the PIC Code MASK. The recent studies are for the two-cavity design now undergoing tests by R. Sheffield, LANL. Pulses up to 10 nC are simulated, using cavities operating at 1300 MHz with above 1 MeV energy gain per cavity. The work is guided by previous simulation results which show that to achieve good agreement with the best experimental results, it is necessary to use very high RF fields near the cathode and to maintain small beam cross sections, corresponding to very high emission density.
16636257
Design of a wiggler-focused, sheet beam X band klystron
An X band klystron using a sheet beam and wiggler focusing was simulated using the 2 + 1/2 dimensional particle in cell code MASK. Simulation of the rf cavities was by means of the port approximation used in modelling of standard klystrons. The wigglers, which would need permanent magnets to achieve the required field strengths, were modelled using an idealized analytic expression with an exponential rise and a linear taper superimposed on a sinusoidal variation. Cavity locations and tunings were varied for maximum output power. Beam voltage and current were also varied to explore the effect on efficiency. Both an idealized laminar beam and a more realistic beam from a gun design code were studied. For a voltage of 200 kV and current of 20 amp per linear cm efficiencies of approximately 50% were calculated.
738055
The linac and booster RF systems for a dedicated injector for SPEAR
A 120 MeV, 2856 MHz, traveling wave linear accelerator (linac), with a microwave gun, alpha magnet, and chopper, has been built at the Stanford Synchrotron Radiation Laboratory (SSRL) as a preinjector for and along with a 3 GeV, 358.54 MHz, booster synchrotron ring. The resulting injector will be available on demand to fill the Stanford Positron-Electron Accelerator Ring (SPEAR), which is a storage ring now dedicated to synchrotron light production. A description is given of the injector's two separate and different frequency RF systems. Synchronization of the two, non-harmonic systems is achieved through the linac's chopper. Some of the interesting mechanical and electrical details are discussed and the operating characteristics of the linac and ring RF are highlighted.<<ETX>>
124416371
CTF3 Drive-Beam Injector Design
The Two-Beam Accelerator concept is one of the most promising methods for producing RF power for future linear colliders. In particular it allows upgrades to multiTeV energies. One of its challenges is the production of the high current drive beam, which as it passes through decelerating structures, produces RF power for acceleration of the main beam. These challenges must be studied at a smaller scale test facility.