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.
42734730
Portable, X-Band, Linear Accelerator Systems
Three light-weight, x-band, electron accelerators have been developed to provide a series of highly portable sources of x-rays and neutrons for nondestructive testing. The 1.5 MeV x-ray unit has a 200 kW magnetron for an RF source and an air-cooled, traveling wave accelerating structure to minimize Its weight. The 4 and 6 MeV units share the same drive system which contains a 1.2 MW magnetron. The 4 MeV unit uses a traveling-wave guide to produce x-rays and the 6MeV unit uses a standing-wave guide to produce x-rays or neutrons. The choice of 9.3 GHz was dictated by the availability of a high power coaxial magnetron and by the obvious dimensional and weight advantages of a higher frequency over the more common S-band frequencies around 3 GHz.
18642583
Application of a Mapping Function Technique to the Design of Damped Detuned Structures and to the Rapid Calculation of Their Wakefields
In order to reduce the dipole wake encountered by the first few bunches accelerated in a multi-bunch NLC scenario the DDS (damped detuned structure) was redesigned such that a much improved Gaussian fall-off occurs in the initial wake-function. From the 9 parameterized model of DDS1 the authors use a mapping function to allow DDS 3 and 4 to be modeled and hence avoid additional and prohibitively time consuming MAFIA runs. The equivalent circuit parameters and geometrical parameters are treated as functions of the synchronous frequency and are readily mapped onto the new synchronous frequencies. The new geometrical parameters form a family where each is associated with the iris diameter.
15840236
Effects of alternating cell misalignments on the DDS
The authors study some effects of cell misalignments in accelerator structures in which each cell is displaced the same amount and direction but with sign which alternates from cell to cell. In particular they study the manifold radiation in a damped detuned structure (DDS1) and wakefield effects in a uniform constant impedance structure. A synchronous wave aliasing phenomenon is observed. In previous treatments the effect of cell misalignment has been modeled by replacing it by beam displacement. Here they compare finite difference simulation of cell misalignment with the beam displacement model. They conclude with discussions about the relevance of the results for general misalignment profiles.
38996638
Nanosecond Electron Beam Generation and Instrumentation at SLAC
of the present SLAC injector including the latest beam chopping equipment. Two off-axis guns can each be grid-modulated with trains of pulses as short as 5 nanoseconds. An initial 39.667 MHz beam deflector has sufficient deflecting field to reject adjacent electron bunches of the 2856 MHz prebunched beam, thereby loading one RF bucket of the accelerator every 12.5 nanoseconds. Fast pulse amplifiers can be used in conjunction with the chopping system to produce any spacing which is a multiple of 12.5 nanoseconds. After the first accelerator section (35 MeV) a quarter wave resonant balanced deflector chops beams to 1 nanosecond for SPEAR injection. A second reverse traveling wave deflector is used in conjunction with the upstream deflector to generate 25 or;50 nanosecond spaced single bunch beams.
54003178
A source of highly polarized electrons at the stanford linear accelerator center
Abstract A polarized electron source based upon photoionization of a state-selected 6 Li atomic beam has been developed as an injection gun for the Standford two-mile electron linear accelerator. The source (PEGGY) produces a pulsed beam of electrons with a maximum intensity of 2.6×10 9 electrons per pulse, a polarization of 0.85, a pulse length of 1.6 μs, and a repitition rate of 180 pulses/s. Since its installation at SLAC in July 1974, PEGGY has been used in several energy electron-nucleon scattering experiments.
123454883
Four-charged-particle final states from the interaction of 2.7 gev/c pi-plus on deuterium
17568135
Topology Types of Adinkras and the Corresponding Representations of N -Extended Supersymmetry
We present further progress toward a complete classification scheme for describing supermultiplets of N-extended worldline supersymmetry, which relies on graph-theoretic topological invariants. In particular, we demonstrate a relationship between Adinkra diagrams and quotients of N-dimensional cubes, where the quotient groups are subgroups of $(Z_2)^N$. We explain how these quotient groups correspond precisely to doubly even binary linear error-correcting codes, so that the classification of such codes provides a means for describing equivalence classes of Adinkras and therefore supermultiplets. Using results from coding theory we exhibit the enumeration of these equivalence classes for all cases up to 26 supercharges, as well as the maximal codes, corresponding to minimal supermultiplets, for up to 32 supercharges.
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
121210133
Inclusive production of charged and neutral sigma hyperons in K−p interactions at 14.3 GeV/c
Abstract Inclusive production of Σ + , Σ − and Σ 0 hyperons in K − p interactions at 14.3 GeV/ c has been studied and compared to Λ production. Cross sections are presented as a function of longitudinal and transverse momenta and compared to the pp → Σ + + anything data.
116487099
The trace of the energy momentum tensor and the lattice interaction measure at finite temperature