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Quarterly technical progress report, October 1-December 30, 1983

Description: Several new initiatives were begun in coal preparation, including a project to develop a liquid CO/sub 2/ coalescence process that will produce a superclean coal containing less than 1% ash. Another new project in this area is focusing on chemical coal cleaning for the removal of harmful trace elements, such as arsenic, lead, and zinc. Milestones were reached in both of our major electron beam flue gas cleanup projects. In the area of coal-water mixtures, our major industrial contracts are now … more
Date: April 1, 1984
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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650 mm long liquid hydrogen target for use in a high intensity electron beam

Description: This paper describes a 650 mm long liquid hydrogen targetr constructed for use in the high intensity electron beam at the Stanford Linear Accelerator Center (SLAC). The main design problem was to construct a target that would permit the heat deposited by the electron beam to be removed rapidly without boiling the hydrogen so as to maintain constant target density for optimum data taking. Design requirements, cosntruction details and operating experience are discussed.
Date: February 1, 1984
Creator: Mark, J.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Relativistic fluid formulation and theory of intense relativistic electron beams

Description: A new general relativistic fluid formulation has been obtained for intense relativistic electron beams (IREB) with arbitrarily high relativistic mass factor ..gamma... This theory is valid for confined IREB equilibria such as those found inside high energy accelerators as well as in the pinched and ion-focused regimes of beam propagation in plasma channels. The new relativistic fluid formulation is based on the covariant relativistic fluid formulation of Newcomb with the parameter lambda identi… more
Date: January 1, 1984
Creator: Siambis, J.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Intense e-beam interaction with matter

Description: This document describes work done in this period on certain nonlinear processes of potential importance at high energy densities in condensed matter, and on the theory of the electron slowing-down-cascade spectrum engendered in solids by e-beams.
Date: January 1, 1984
Creator: Ritchie, R.H. & Crawford, O.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analytic solution for the problem of gridded gap-electron flow interaction

Description: The present study is motivated by the modelling of high-power klystrons. The two basic components of a Klystron are the resonant cavities and the drift spaces. This paper addresses only the first of these two components. Modelling of the drift spaces is deferred to future work. The formulation is not restricted to Klystron modelling, but is applicable to any problem involving the interaction of an electron beam with a resonant cavity. While the theory of Klystrons has been worked out in detail … more
Date: January 1, 1984
Creator: Kheifets, S.; Yu, S. & Jaeger, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High brightness cathode experiments on the experimental test accelerator (ETA). Final report

Description: The experiments performed on the ETA during the months of September through October of 1984 were intended to accomplish two objectives; to discover or develop a source capable of producing an electron beam whose brightness is substantially higher than that of previous sources, and to determine, if possible, the mechanisms which limit the source brightness so that further enhancements might be obtained. The results of the experiments met these objectives to a limited degree. A cathode material (… more
Date: January 1, 1984
Creator: Schlitt, L. & Proulx, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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First order variation of the dispersion function with particle energy deviation

Description: The variation of the dispersion function with the particle energy deviation can presently be calculated from second order transfer matrices; its periodic solution is determined numerically. The general differential equations for the dispersion function deduced from the complete equation of motion to second order are solved, using Green's function integral leading to an analytical expression of the periodic solution of the dispersion function D/sub 0/ and of the first order perturbation, D/sub 1… more
Date: December 1, 1984
Creator: Delahaye, J. P. & Jaeger, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Look at energy compression as an assist for high power rf production

Description: The desire to construct electron linacs of higher and higher energies, coupled with the realities of available funding and real estate, has forced machine designers to reassess the limitations in both accelerator gradient (MeV/m) and energy. The gradients achieved in current radio-frequency (RF) linacs are sometimes set by electrical breakdown in the accelerating structure, but are in most cases determined by the RF power level available to drive the linac. In this paper we will not discuss RF … more
Date: August 9, 1984
Creator: Birx, D. L.; Farkas, Z. D. & Wilson, P. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experiments on ETA comparing wire-conditioned and non-wire-conditioned beam propagation

Description: This report describes experiments in beam propagation with the ETA beam during 1982 following accelerator cavity modifications which allowed a maximum beam current of up to 8 kA at the entrance to the propagation tank. A prominent new feature of the propagation in high pressure gas was an enhancement of the net current as the beam propagated. In some cases this enhanced current was nearly double the injected beam current. The strong current enhancement was associated with strong transverse hose… more
Date: January 18, 1984
Creator: Clark, J. C.; Lauer, E. J.; Prono, D. S. & Struve, K. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron transport and transient conductivity of irradiated insulators

Description: Irradiation of an insulator by an intense electron beam causes a large transient increase in the conductivity, due to ionization. In this talk, the development of a theory of this effect and comparison with experiments are described. Predictions of the scaling of transient conductivity over a wide range of beam current are made on the basis of present understanding, and issues for future work are presented. 9 figures.
Date: January 1, 1984
Creator: Crawford, O.H. & Ritchie, R.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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60 GHz, 200 kW CW gyrotron with high output mode purity

Description: For the first time, a Varian 60 GHz gyrotron, designed specifically to generate microwaves in a single output mode, has been operated at power levels up to 200 kW CW. High output mode purity is required for the efficient utilization of gyrotrons as high power microwave sources for electron cyclotron resonance heating (ECRH) in magnetic fusion plasmas. Using mode-specific directional couplers, measurements of the output mode content indicated that greater than 95% of the microwave output was in … more
Date: January 1, 1984
Creator: Jory, H.; Felch, K.; Bier, R.; Fox, L.; Huey, H.; Ives, L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experience with a high-brightness storage ring: the NSLS 750 MeV vuv ring

Description: The NSLS vuv ring is the first implementation of the proposals of R. Chasman and G.K. Green for a synchrotron radiation source with enhanced brightness: its lattice is a series of achromatic bends with two zero-gradient dipoles each, giving small damped emittance; and these bends are connected by straight sections with zero dispersion to accommodate wigglers and undulators without degrading the radiation damping properties of the ring. The virtues of the Chasman-Green lattice, its small betatro… more
Date: January 1, 1984
Creator: Galayda, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Database requirements for the Advanced Test Accelerator project

Description: The database requirements for the Advanced Test Accelerator (ATA) project are outlined. ATA is a state-of-the-art electron accelerator capable of producing energetic (50 million electron volt), high current (10,000 ampere), short pulse (70 billionths of a second) beams of electrons for a wide variety of applications. Databasing is required for two applications. First, the description of the configuration of facility itself requires an extended database. Second, experimental data gathered from t… more
Date: November 5, 1984
Creator: Chambers, F.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design considerations for a 100 kW c-w, 140 GHz gyrotron oscillator

Description: A gyrotron oscillator capable of generating 100 kW of c-w power is currently under development at Varian. The tube is being designed for operation in the TE/sup 0//sub 031/ cavity mode with the electron beam located at the second radial electric field maximum in the cavity. The electron beam will be produced by a magnetron injection gun and the 56 kG magnetic field required for 140 GHz operation will be provided by a superconducting magnet. Initial design calculations for the important elements… more
Date: January 1, 1984
Creator: Felch, K.; Bier, R.; Fox, L.; Huey, H.; Ives, L.; Jory, H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron storage ring beam lifetime dependence on pressure and pumping speed

Description: The beam loss in electron storage rings depends to a large extent on the interaction of the beam with heavier residual gas molecules such as CO, CO/sub 2/ and A due to Bremsstrahlung and Coulomb scattering. The gas density inside the vacuum chamber is determined by the surface condition of the vacuum chamber which is bombarded by photons (synchrotron radiation) generated by circulating electron beams and by the installed pumping. During the spring shutdown the x-ray ring vacuum system was updat… more
Date: January 1, 1984
Creator: Halama, H.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Wake fields and wake field acceleration

Description: In this lecture we introduce the concepts of wake fields and wake potentials, examine some basic properties of these functions, show how they can be calculated, and look briefly at a few important applications. One such application is wake field acceleration. The wake field accelerator is capable of producing the high gradients required for future very high energy e/sup +/e/sup -/ linear colliders. The principles of wake field acceleration, and a brief description of experiments in progress in … more
Date: December 1, 1984
Creator: Bane, K.L.F.; Wilson, P.B. & Weiland, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Variation of the damping partition numbers with particle energy deviation

Description: Until now, calculation of the rates of change of the damping partition numbers with particle energy took into account only the effects of quadrupole fields. It has been found however, by tracking particles in the LEP Electron Positron Accumulator that the actual variation of the damping partition numbers with energy can be increased up to a factor three by introduction of sextupole fields. The present note gives a complete analytical expression for the variation of the damping partition numbers… more
Date: October 1, 1984
Creator: Delahaye, J. P. & Jaeger, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Operation of a quasioptical electron cyclotron maser

Description: The electron cyclotron maser or gyrotron concept has been developed to produce sources producing 200 kW at 28 GHz continuously, and higher power outputs and frequencies in pulsed mode. These sources have been useful in electron cyclotron resonance heating (ECRH) in magnetically confined fusion devices. However, higher frequencies and higher power levels will be required in reactor-grade fusion plasmas, with likely requirements of 1.0 MW or more per source at 140 GHz. Conventional gyrotrons foll… more
Date: December 1, 1984
Creator: Morse, E. C. & Pyle, R. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SLC positron damping ring optics design

Description: The basic SLAC Linear Collider operation scheme assumes the use of two damping rings, one for the e/sup -/, one for the e/sup +/, in order to reduce the colliding beam normalized emittances to 30..pi.. ..mu..radm hence raising the corresponding luminosity by a factor 170. The e/sup -/ damping ring which optics was designed by H. Wiedemann, has been extensively studied and modelled since it's completion at the end of 1982. The e/sup +/ damping ring to be built soon will be based on the same desi… more
Date: December 1, 1984
Creator: Delahaye, J. P. & Rivkin, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Storage-ring FEL for the vuv

Description: A free-electron laser for the vuv operating in a storage ring requires an electron beam of high density and low energy spread and a short wavelength, narrow-gap undulator. These conditions tend to produce longitudinal and transverse beam instabilities, excessive beam growth through multiple intrabeam scattering, and a short gas-scattering lifetime. Passing the beam only occasionally through the undulator in a by-pass straight section, as proposed by Murphy and Pellegrini, allows operation in a … more
Date: September 1, 1984
Creator: Peterson, J. M.; Bisognano, J. J.; Garren, A. A.; Halbach, K.; Kim, K. J. & Sah, R. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Facilities for studying radiation damage in nonmetals during irradiation

Description: Two facilities have been developed for making optical absorption, luminescence and other measurements on a single sample before, during and after irradiation. One facility uses /sup 60/Co gamma rays and the other 0.5 to 3 MeV electrons from an accelerator. Optical relays function as spectrophotometers, luminescenc detectors, etc. All radiation sensitive components are outside of walk-in irradiation chambers; all measurement control and data recording is computerized. Irradiations are made at co… more
Date: August 1, 1984
Creator: Levy, P.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Two-beam accelerator

Description: In the two-beam accelerator (TBA) concept, an electron linear accelerator structure is established in which two beams propagate. One is an intense low energy beam that is made to undergo free electron lasing to produce microwaves. These microwaves are then coupled to another part of the structure where they act to produce a high longitudinal electric gradient that is used to accelerate a second relatively low intensity electron beam to very high energies. The TBA was originally suggested by Ses… more
Date: September 1, 1984
Creator: Selph, F.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Confinement of low-energy electrons near metallic surfaces for plasmon generation

Description: A novel technique is used in studying the energy loss spectrum of aloof (nontouching) electrons with surfaces. Metallic foils perforated by microchannels restrict the maximum impact parameter to the channel radius (20 to 200 nm). The passage of electrons (20 to 2000 eV) near the cylinder walls results in prominent energy-loss structure. In silver, a resonance loss peak at 3.5 to 3.6 eV is attributed to the formation of surface plasmons on the silver channels. The problem is modeled by a classic… more
Date: January 1, 1984
Creator: Warmack, R. J.; Ferrell, T. L.; Ritchie, R. H.; Becker, R. S.; Mamola, K. C.; Buncick, M. C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optical loop framing

Description: The ATA provides an electron beam pulse of 70-ns duration at a 1-Hz rate. Our present optical diagnostics technique involve the imaging of the visible light generated by the beam incident onto the plant of a thin sheet of material. It has already been demonstrated that the light generated has a sufficiently fast temporal reponse in performing beam diagnostics. Notwithstanding possible beam emittance degradation due to scattering in the thin sheet, the observation of beam spatial profiles with r… more
Date: June 1, 1984
Creator: Kalibjian, R.; Chong, Y.P.; Prono, D.S. & Cavagnolo, H.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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