38762481
The PEP Injection System
A system to transport 10-to-15-GeV electron and positron beams from the Stanford Linear Accelerator and to inject them into the PEP storage ring under a wide variety of lattice configurations has been designed. Optically, the transport line consists of three 360° phase-shift sections of FODO lattice, with bending magnets interspersed in such a way as to provide achromaticity, convenience in energy and emittance definition, and independent tuning of the various optical parameters for matching into the ring. The last 360° of phase shift has 88 milliradians of bend in a vertical plane and deposits the beam at the injection septum via a Lambertson magnet. Injection is accomplished by launching the beam with several centimeters of radial betatron amplitude in a fast bump provided by a triad of pulsed kicker magnets. Radiation damping reduces the collective amplitude quickly enough to allow injection at a high repetition rate.
107968565
MBE-4: an induction linac experiment for heavy ion fusion
The multiple-beam induction linac approach to a heavy ion fusion driver features continuous current amplification along the accelerator and a minimum of transverse beam manipulation from source to pellet. Current amplification and bunch length control require careful shaping of the accelerating voltages. This driver approach exploits developments in electron induction linac technology that have occurred within the last 15 years at LBL, LLNL and NBS. MBE-4 is a four beam induction linac that models much of the accelerator physics of the electrostatically focused section of a considerably longer induction accelerator. Four parallel Cs/sup +/ beams are electrostatically focussed and will be accelerated from 200 keV to approximately one MeV when the experiment is complete in the spring of 1987. The current in each of the four beams will increase from 10 to 40 mA due to both increase in beam speed and shortening of the bunch length. Results of experiments with the injector and first eight accelerating gaps are presented.
41238054
PEP Insertion Quadrupole Design Features
The insertion quadrupoles for the PEP storage ring must have a very uniform gradient to focus the circulating beams to a very small size at the interaction point for high luminosity. Quads have been built which achieve the desired field within the full pole aperture radius to approximately one part in 104. The design features which permitted this achievement are described.
111218115
Controlling Accelerator Engineering Costs
Cost control for accelerator engineering involves task definition, planning related expenditures, measuring progress, tabulation of costs and projections, and, most important of all, follow-up for corrections. Accelerator engineering costs are best regulated by the accelerator engineer, since those who are in any way detached from the work cannot exercise the most effective control. The accelerator engineer should be assisted by providing him with an effective system, appropriate forms and reports, and administrative support.
33708694
Acceleration of Uranium at the Bevalac
Recent upgrading projects have extended the mass range of particles that can be accelerated at the Bevalac to include any element of the periodic table to energies above 1 billion electron volts per atomic mass unit. This capability was verified on 11 May 1982 with the production of a uranium beam at 147.7 million electron volts per atomic mass unit.
117723646
ROCK EXCAVATION BY PULSED ELECTRON BEAMS
If an intense short pulse of megavolt electrons is deposited in a brittle solid, dynamic spalling can be made to occur with removal of material. Experiments were made on several types of hard rock; results are reproducible and well-described theoretically. An accelerator with a rapidly-pulsed scanning electron beam was designed that could tunnel in hard rock about ten times faster than conventional drill/blast methods.
119387313
Charged hadron production at high X in E+ E- annihilation at S**(1/2) = 29-GEV
123050118
$f1(1285)$ formation in photon photon fusion reactions
Abstract We have observed formation of the f 1 (1285) in the reaction e + e - →e + e - π + π - η ( η → γγ ). Its γγ ∗ width is determined in several Q 2 bins. The γγ coupling parameter for the f 1 (1285) is found to be 2.4±0.5±0.5 keV. This value is compared to that for the X (1420), another J =1 state formed in γγ fusion reactions, which may belong to the same meson nonet.
123222571
Measurement of the photon structure function F(2) (gamma) (X, Q**2) between 10-GEV**2 < Q**2 < 60-GEV**2
124490005
An experimental study of spin 1 mesons produced in two photon reactions
125894282
BOSE-EINSTEIN CORRELATIONS OF PIONS IN e+ e-ANNIHILATION AT 29-GeV CENTER-OF-MASS ENERGY