No abstract available

No abstract available

[en] In order to achieve a high luminosity in EPIC, the proposed UK e⁺-e^- storage ring, low-β insertions will be used at each of the four interaction regions. The consequent increase in chromaticity, xi = (ΔQ/Q)/(Δp/p), must be corrected by means of sextupoles, which in turn introduce third and higher order resonances. This effect sets an upper limit to the allowable β-values in the high-β quadrupoles of the interaction region. (auth)

[en] A requirement for the EPIC aluminium vacuum chamber extrusions is for a bake-out under vacuum at a temperature of 200⁰C. The material selected for the vessel is an aluminium alloy (6061 T4) which suffers creep deformation at the bake-out temperature. A theoretical estimate of creep effects is presented. (author)

[en] This report covers the nine-month period, February 15 to November 15, 1976. During this period, in the main part, continued activities towards the completion of the EPICS and HRS spectrometers at LAMPF were continued. The entire HRS facility was successfully completed and test-data are now being taken. The EPICS channel was completed, and the tune-up of the channel successfully done. The EPICS spectrometer assembly is still continuing. Data taking on one experiment in collaboration with CEN de Saclay was completed. Ph.D. was awarded to one student during this period. A list of publications is included

No abstract available

[en] In the proposed electron-positron storage ring EPIC, very high peak currents in the circulating beams will give rise to transient beam loading effects. These effects were studied in order to find the extra rf power needed because of them. (auth)

[en] Due to the high cost of the magnets in the main ring of EPIC it is important to minimise their apertures by keeping vacuum chamber walls as thin as possible. The aluminium extrusions to be used in the normal cells are of two different sections for passing through the dipole and quadrupole magnets. In the insertions stainless steel chambers may be used. The purpose of this note is to examine the strength of the aluminium extrusions. (author)

[en] The Cornell Electron Storage Ring (CESR) has provided over 2.5 f^-1 integrated luminosity on the Y(4S) resonance and nearby continuum, facilitating measurements of B meson decays. In order to seek out rarer events, the luminosity of the storage ring must maintain a geometric growth. The luminosity upgrade program of CESR provides this growth capability while utilizing many of the developments in technology and accelerator physics required for later upgrade to an asymmetric B factory. All upgrades incorporate approximately the same per-bunch parameters as in CESR's present operation. The next step in the upgrade replaces the individual bunches with open-quotes bunch trains,close quotes or closely spaced groups of bunches treated as a single bunch by the pretzel separation scheme. The higher beam currents will require improvements to the RF, vacuum, feedback, and injector systems. Separation at the parasitic interaction points near the main interaction point is provided by a small horizontal crossing angle. Machine experiments have been conducted to determine criteria for separation at parasitic crossings and measure the effects of small crossing angles on beam-beam dynamics, as well as study other topics related to the upgrade program

[en] The life of a High Energy Physics experiment is divided into four stages; planning, setting up, data taking and analysis. The first and last of these stages are continually increasing the load and already overworked central computing facilities. This situation may be eased by moving some of the data reduction into the date taking stage, which is generally controlled by a minicomputer. Replacing the mini-computer by a faster and more powerful machine is a possible solution but more remarkable gains may be achieved by adding special computing hardware to which the minicomputer acts as a host. This paper outlines the design considerations and architecture of hardware intended for this application, and illustrates its usefulness in an experiment