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ISABELLE

Description: A summary is presented of the general features of the design and status of the ISABELLE storage ring facility at BNL including projected experiments, and cost estimates. (GHT)
Date: January 1, 1978
Creator: White, D.H.
Partner: UNT Libraries Government Documents Department

Access control system for ISABELLE

Description: An access system based on the one now in operation at the CERN ISR is recommended. Access doors would presumably be located at the entrances to the utility tunnels connecting the support buildings with the ring. Persons requesting access would insert an identity card into a scanner to activate the system. The request would be autologged, the keybank adjacent to the door would be unlocked and ISABELLE operations would be notified. The operator would then select the door, activating a TV-audio link. The person requesting entry would draw a key from the bank, show it and his film badge to the operator who would enable the door release.
Date: August 17, 1977
Creator: Potter, K. & Littenberg, L.
Partner: UNT Libraries Government Documents Department

Notes on luminosity variation at ISABELLE

Description: In the present ISABELLE design, the luminosity at each insertion will be the same, unless special efforts are taken to get a low-..beta.. insertion or reduced crossing angle. These can only change the luminosity by factors of 2 to 4 from insertion to insertion. An estimation of the range of desired luminosities is given.
Date: October 19, 1977
Creator: Herrera, J.C.; Marx, M.; Roe, B. & Rosenberg, E.I.
Partner: UNT Libraries Government Documents Department

Industrial participation in TRISTAN project at KEK, Japan

Description: Industry-Laboratory collaborations played a very important role in the construction of TRISTAN electron-positron colliding beam facility, and brought this construction project to a successful completion in a scheduled time. What had motivated the collaborations, what were the important elements in the successful collaborations and how the collaborations worked will be given based on the authors experience as the TRISTAN Project Director. It is my pleasure to participate in this meeting of IISSC, and to present a talk on my experience with industry-laboratory cooperations in the construction of a major high energy accelerator facility in Japan; namely the TRISTAN electron-positron colliding beam facility project at KEK, (National Laboratory for High Energy Physics) in Tsukuba, Japan.
Date: January 1, 1990
Creator: Ozaki, Satoshi.
Partner: UNT Libraries Government Documents Department

Recent improvements in luminosity at PEP

Description: We will describe improvements which have led to new records for peak and average luminosity at PEP. Comparison of recent results with several earlier lattice and optical modifications shows rather good correlation with the predictions of a beam-beam simulation program.
Date: March 1, 1983
Creator: Helm, R.; Allen, M. & Chao, A.
Partner: UNT Libraries Government Documents Department

rf reference line for PEP

Description: A rf phase reference line in 6 segments around the 2200 meter circumference PEP storage ring is described. Each segment of the reference line is phase stabilized by its own independent feedback system, which uses an amplitude modulated reflection from the end of each line. The modulation is kept small and decoupled from the next segment to avoid crosstalk and significant modulation of the rf drive signal. An error evaluation of the system is made. The technical implementation and prototype performance are described. Prototype tests indicate that the phase error around the ring can be held below 1 degree with this relatively simple system.
Date: March 1, 1979
Creator: Schwarz, H.D. & Weaver, J.N.
Partner: UNT Libraries Government Documents Department

Open areas and open access

Description: One objective of the two open areas in the present ISABELLE design is to provide flexibility with respect to the size and shape of experimental equipment that would eventually be installed there. No permanent building would be installed initially. A second objective of the design of open areas is to keep initial costs as low as practicable. Another objective is open access. This note explores this idea and some design concepts based on it. It would permit inserting large pieces of experimental equipment quickly and removing them with equal ease and speed. Entire experiments would be moved in a single piece (or a few) by building them on movable platforms with capacities of up to about 1000 tons per platform. Most experiments could be built on a single platform or on a few. The shielding must also be moved. It must also be organized into a small number of large units. A scheme using large tanks filled with water is described. It is important to make the equipment on a given platform as complete and self-contained as possible, with a minimum of interconnections for power, coolant, controls, data transmission, etc. 5 figures. (RWR)
Date: January 1, 1978
Creator: Thorndike, A.M.
Partner: UNT Libraries Government Documents Department

Two superconducting storage rings: ISABELLE

Description: The general features of the design and the status of the ISABELLE storage ring project at the present time are reported. It brings up to date the results reported at the National Particle Accelerator Conference in March 1977. The most significant change since that time has been an upgrading of the energy of the overall facility, and acceptance of the project by the Department of Energy.
Date: January 1, 1978
Creator: Sanford, J.R.
Partner: UNT Libraries Government Documents Department

BEAM-CAVITY INTERACTION IN ELECTRON STORAGE RINGS

Description: A formal expression is obtained for the energy loss per turn, of a rigid bunch of electrons, to a closed cylindrical cavity with quality factor Q. The expression is valid provided the diameter of the entrance and exit ports for the beam are small compared to the bunch length. The effect of the ports is studied in an independent computational method. The energy loss is numerically evaluated for a range of parameters of interest to electron storage rings.
Date: April 1, 1975
Creator: Henkin, Bruce M. & Sauer, Kenneth
Partner: UNT Libraries Government Documents Department

THE EQUILIBRIUM LENGTH OP HIGH-CURRENT BUNCHES IN ELECTRON STORAGE RINGS

Description: An equilibrium theory of the length of intense electron bunches circulating in a storage ring is presented. The consequence of electrical interaction with various resonant structures is expressed in terms of quadratures over the impedance of the structures, and impedance functions for a variety of elements are evaluated. It is shown that elements having resonances at high frequency can, above transition, cause bunches to increase in length with increasing current. The parametric dependence of the bunch lengthening is found to be in good agreement with observations, and numerical estimates, which are in substantial agreement with experiment, are presented.
Date: August 7, 1970
Creator: Pellegrini, C. & Sessler, A.M.
Partner: UNT Libraries Government Documents Department

Flip-Flop Modes in Symmetric and Asymmetric Colliding-Beam Storage Rings

Description: A model of self-consistent beam blow-up in a colliding beam storage ring is described which explains the appearance of flip-flop modes in both symmetric and asymmetric beam systems. It derives the strong-strong steady-states and their stabilities from the weak-strong behavior. This model agrees well with the observed flip-flop behavior in storage rings, including the hysteresis seen when the beams are flipped from one asymmetric steady state to the other. It can be used to predict the behavior of proposed facilities in which the two colliding beams are characterized by different parameters.
Date: August 1, 1989
Creator: Tennyson, J.L.
Partner: UNT Libraries Government Documents Department

Overview of the bump-magnet system at the LANSCE proton storage ring

Description: An upgrade program for increasing the stored beam current in the Proton Storage is presently under way. A part of the upgrade is the design and installation of a four-magnet beam-bumping system used for phase-space painting and minimizing interaction of the stored beam with the injection stripper foil. This paper describes the bump- magnet system including the relevant beam requirements, magnet specifications, power-cable specifications, pulsed-modulator requirements, and beam-tube eddy-current effects. The magnets are ferrite window-frame magnets with saddle windings. The series-pass pulsed modulators are programmable both in rise and fall time as well as amplitude. The peak current can be varied between 50 and 300 A. The pulsed-current rise-time is fixed at 1 ms, and the linear fall- time during which beam is injected into the ring can be varied between 0.5 and 1.5 ms.
Date: September 1, 1997
Creator: Rose, C.R.; Barlow, D.B.; Blind, B.; Neri, F.; Power, J.F. & Walstrom, P.L.
Partner: UNT Libraries Government Documents Department

Closed orbit response to quadrupole strength variation

Description: We derive two formulae relating the variation in closed orbit in a storage ring to variations in quadrupole strength, neglecting nonlinear and dispersive effects. These formulae correct results previously reported [1,2,3]. We compare the results of the formulae applied to the ATF with simulations using MAD, and consider their application to beam-based alignment.
Date: January 20, 2004
Creator: Wolski, Andrzej & Zimmermann, Frank
Partner: UNT Libraries Government Documents Department