D. Fryberger

On Generalized Electromagnetism and Dirac Algebra

Using a framework of Dirac algebra, the Clifford algebra appropriate for Minkowski space-time, the formulation of classical electromagnetism including both electric and magnetic charge is explored. Employing the two-potential approach of Cabibbo and Ferrari, a Lagrangian is obtained that is dyality invariant and from which it is possible to derive by Hamiltons principle both the symmetrized Maxwells equations and the equations of motion for both electrically and magnetically charged particles. This latter result is achieved by defining the variation of the action associated with the cross terms of the interaction Lagrangian in terms of a surface integral. The surface integral has an equivalent path-integral form, showing that the contribution of the cross terms is local in nature. The form of these cross terms derives in a natural way from a Dirac algebraic formulation, and, in fact, the use of the geometric product of Dirac algebra is an essential aspect of this derivation. No kinematic restrictions are associated with the derivation, and no relationship between magnetic and electric charge evolves from the (classical) formulation. However, it is indicated that in bound states quantum mechanical considerations will lead to a version of Diracs quantization condition. A discussion of parity violation of the generalized electromagnetic theory is given, and a new approach to the incorporation of this violation into the formalism is suggested. Possibilities for extensions are mentioned.

Tests and Description of Beam Containment Devices and Instrumentation - A New Dimension in Safety Problems

The destructive capability of the beam power of some accelerators was dramatically demonstrated in a series of tests at SLAC using an 18 GeV e- beam at average powers ranging from 165 to 880 kW. The purpose of the experiments was to examine a series of devices which simulated beam stoppers, protection collimators and burnthrough monitors as presently applied at SLAC. Specific attention was given to the recording of burnthrough times, temperature behavior, and to the analysis of failure modes. A summary of the test data is presented. The design of an extensive electronic system to prevent damage to mechanical devices and to detect onset of destruction is discussed. Various sensors are connected to integrating and peak reading circuits to form power, beam verification and errant beam monitors. Burnthrough monitors shut down the accelerator if damage occurs to critical items. New features such as self-checking, protected wiring and rapid on-line calibration are described.

A data-acquisition system for a large wire chamber spectrometer

Abstract A large wire chamber spectrometer for the study of neutral K-meson decays has been constructed. The construction and performance of the wire chamber and high voltage pulsing system, the readout and data-acquisition systems are described.

A Small particle model as a possible explanation of recently reported cavity lights

Abstract Very unusual light phenomena have been observed inside superconducting niobium cavities under an electrical excitation equivalent to an average acceleration of ∼4 MV / m . Of particular interest is the observation of what appear to be objects executing elliptical orbits. A small particle model that yields a cylindrical harmonic oscillator potential well inside such a cavity is developed and appears to offer considerable promise as an analytical framework in which to understand these observations; the harmonic oscillator potential well has elliptical orbits as general solutions. However, explicit calculations indicate that with the cavity excitation parameters associated with this data, it is highly unlikely that a small object orbiting in such a potential well can be made of any known material. Deficiencies of the model are discussed, and avenues for further study, both theoretical and experimental, are indicated..

Coulomb scattering of an electron by a monopole

The Coulomb scattering of an electron by a magnetic monopole is analyzed using a lowest-order quantum perturbation approximation suggested by a two-potential Lagrangian form for classical electromagnetism, generalized through the use of spacetime algebra to include magnetic monopoles. Good agreement with existing conventional analyses of this problem is demonstrated.

A reply to “a comment on generalized electromagnetism and Dirac algebra”

Issues raised by W. A. Rodrigues, Jr. are discussed.

Recent Results for e + e − Annihilation at Spear

In this presentation I shall assume that everyone is familiar with the existence of two narrow resonances coupling to electrons1,2,3 at masses of 3.1 and 3.7 GeV. Properties of these resonances will be described at length. I shall also discuss upper limits which we can place for the production of other such resonances in the range 3.2 to 5.9 GeV.4 Lastly, I shall discuss some tantalizing structure at 4.1 GeV.5 This talk will concentrate upon the experimental facts, various speculations will be left for other speakers. It should be emphasized that most results described are preliminary and are subject to refinement.

A Wire Spark Chamber Spectrometer with a Capacitor Memory and FET Readout

A 20-plane wire chamber spectrometer utilizing capacitors as memory elements and suitable for operation in a magnetic field is described. The (parallel) wire planes are separated by 1 cm. The active areas of the chambers range in size from 120 × 120 cm2 to 200 × 240 cm2. The wire separation is 1 mm. Each readout wire is connected to a separate capacitor resulting in a 30 K-bit memory for the total system. Using FETs as gates, the capacitors are read out in 32 bit words. These words are formatted into data sets of 18 bits/spark and transferred to a PDP-9 computer. Digital processing of data is briefly described, including the computer interface and test procedures. Advantages of this system are discussed together with some performance characteristics.