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in subjects: "Synchrotrons 430300* -- Particle Accelerators-- Auxiliaries & Components"

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Experience with the NEG (nonevaporable getter) strips at the Brookhaven heavy ion transport line

The AGS and the Tandem Van de Graaff, two valuable physics assets, are now jointed together by a transport line of 700 m in length. This line allows heavy ions from the Tandem, up to a fully striped silicon (M = 28) to be injected into the AGS and accelerated to energies of approximately 15 GeVamu. New areas of physics research at very high nuclear densities can now be studied using some of the extensive experimental facilities already existing at the AGS. With the addition of a booster synchro… more

Date: January 1, 1988

Creator: Hseuh, H. C.; Benjamin, J.; Stattel, P.; Feigenbaum, I. & Manni, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Magnetic measurements of the correction and adjustment magnets of the main ring

Correction magnets correct the field imperfections and alignment errors of the main quadrupole and bend magnets. For reducing and controlling chromaticity there are 186 sextupoles and 78 octupoles, while for suppressing various resonances there are 12 normal and 18 skew sextupoles and 24 normal and 19 skew quadrupoles. Beam positions are individually controlled by 108 horizontal and 108 skew dipoles. This report includes results of the all Main Ring correction and adjustment magnet harmonic mea… more

Date: July 1, 1986

Creator: Trbojevic, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Low-level rf system for the AGS Light Ion Program

The new low level rf system for the light ion acceleration program features direct digital control of a phase continuous rf synthesizer clocked by finite changes in the B field. The system, its operation and testing are described. The system covers the complete rf frequency range and switches over from single cavity acceleration to multiple cavity acceleration with no beam loss. It also switches from the programmed drive to the normal bootstrap system.

Date: January 1, 1987

Creator: Kovarik, V.; Ahrens, L.; Barton, D. S.; Frankel, R.; Otis, A.; Pope, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design and status of the AGS booster accelerator

Comments are given on some areas of the design considered for the AGS Booster Accelerator, including lattice design, energy and repetition rate, injection, radio frequency system, and the vacuum system. The current status is then briefly described. (LEW)

Date: January 1, 1987

Creator: Forsyth, E. B. & Lee, Y. Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Radial damping by octupole for ZGS beam

Landau damping by the octupolar tune spread is used to prevent the radial blowup of the beam during the acceleration cycle. The octupole field is produced by a set of pole face windings in the ring magnets. The strength of the octupole field, which is controlled by the Zero Gradient Synchrotron (ZGS) programmer, is set to give a tune profile of ..nu../sub x/ = 0.83 + 0.008 x a/sup 2/, where a is the radial coordinate of the aperture in unit of cm. The radial damper feedback system, which has be… more

Date: January 1, 1977

Creator: Cho, Y.; Rauchas, A. & Wright, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Advanced concepts in accelerator timing control

The control system for the Booster accelerator presently under construction at BNL includes a timing section with serial high speed coded data distribution, computer based encoders for both real time and field driven clocks and a method of easily tracking the performance and reliability of these timing streams. We have developed a simple method for the generation of timing which operates to produce pulses which may be repeated as desired with minimal latency.

Date: January 1, 1988

Creator: Frankel, R. & Salwen, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Degassing of the AGS extraction magnets with uv light

Two types of degassing sources, a uv lamp and in Infrared (IR) radiant heat lamp, were tested in spare AGS kicker magnets and septum magnets. This paper reports our study of the degassing treatment during pumpdowns of two kicker magnets.

Date: January 1, 1987

Creator: Hseuh, H. C.; Tuozzolo, J. E. & Trabocchi, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Update on the tevatron muon shield

In 1984, the dichromatic train was installed for an initial set of tests. Along with these tests of train performance, measurements of muon rates at various depths in the berm were taken in order to check Monte Carlo predictions. Data were taken at a range of train momentum settings, and from a bare target. The results of those studies are presented here and compared to predictions. In 1985, the quadrupole triplet train was installed for a wide band neutrino run. During this run, 5.5 m of 1.8 m… more

Date: September 15, 1986

Creator: Malensek, A. & Stutte, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Operational experience and techniques for controlled longitudinal phase space dilution in the AGS using a high harmonic cavity

A fixed frequency 93 MHz harmonic cavity has been installed in the AGS ring. The primary purpose of this harmonic cavity is to increase (dilute) the longitudinal phase space area occupied by the beam by as much as a factor of four (to 4.0 eV-s) in a controlled, rapid manner while maintaining a smooth local density. This then will permit essentially lossless passage through transition energy (8.0 GeV) at intensities higher than previously achieved. Although the system controls permit as many as … more

Date: January 1, 1989

Creator: Reece, R. K.; Ahrens, L.; Abola, A.; Brennan, J. M.; Cameron, P.; Ciardullo, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Operational experience with superconducting synchrotron magnets

The operational experience with the Fermilab Tevatron is presented, with emphasis on reliability and failure modes. Comprisons are made between the operating efficiencies for the superconducting machine and for he conventional Main Ring.

Date: March 1, 1987

Creator: Martin, P.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tha AGS Booster high frequency rf system

A high level rf system, including a power amplifier and cavity has been designed for the AGS Booster. It covers a frequency range of 2.4 to 4.2 Mhz and will be used to accelerate high intensity proton, and low intensity polarized proton beams to 1.5 GeV and heavy ions to 0.35 GeV per nucleon. A total accelerating voltage of up to 90kV will be provided by two cavities, each having two gaps. The internally cross-coupled, pushpull cavities are driven by an adjacently located power amplifier. In or… more

Date: January 1, 1988

Creator: Sanders, R.; Cameron, P.; Damn, R.; Goldman, M.; Jablonski, E.; Keane, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design considerations for a large aperture high field superconducting dipole

The final phase of the Fermilab upgrade proposal calls for a new ring of superconducting magnets to be placed in the existing Main Accelerator tunnel. The goal of this design study is to specify a high field dipole (HFD) that is capable of supporting fixed target operation (ramping, resonant extraction) at a field of 6.6T (1.5 Tev) and colliding beam physics at 8.0T (1.8 Tev). The magnetic field quality at high field is set by the large amplitude orbits associated with resonant extraction. The … more

Date: March 1, 1989

Creator: Harfoush, F.; Ankenbrandt, C.; Harrison, M.; Kerby, J.; Koepke, K.; Mantsch, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Generic device controller for accelerator control systems

A new distributed intelligence control system has become operational at the AGS for transport, injection, and acceleration of heavy ions. A brief description of the functionality of the physical devices making up the system is given. An attempt has been made to integrate the devices for accelerator specific interfacing into a standard microprocessor system, namely, the Universal Device Controller (UDC). The main goals for such a generic device controller are to provide: local computing power; f… more

Date: January 1, 1987

Creator: Mariotti, R.; Buxton, W.; Frankel, R. & Hoff, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The determination of the 805 MHz side coupled cavity dimensions for the Fermilab Linac upgrade

In order to achieve the proper frequencies and coupling in Side Coupled Accelerator Structures, it is often necessary to model the cavities. In order to reduce the number of modeling steps and hence reduce machine shop time and cost, we have drawn heavily upon previous LAMPF experience and present day numerical calculation programs. Using a few aluminum cavity models at selected machine energies, we have been able to predict the frequency and coupling of our structures with good accuracy. This … more

Date: September 1, 1990

Creator: Jurgens, Thomas G.; Miller, Harold W.; Moretti, Alfred & Zhou, Ping

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The A0 abort system for the Tevatron upgrade

The installation of electrostatic separator modules at B48 and C17 in the Tevatron necessitates changes to the Tevatron abort system. There will no longer be room for either the proton or antiproton kicker magnets used in the present system. The kickers at C17 will be permanently removed. The kickers at B48 will be temporarily removed for collider operation and will be replaced for fixed target operation. The existing proton abort system will remain unchanged during fixed target operation. This… more

Date: March 1, 1989

Creator: Crawford, Curtis

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Characteristics of inversion operation on Fermilab phase controlled pulsed power supplies

A well known property of phase controlled rectifiers with pulsed inductive loads is the ability to advance firing angles from full rectification (positive voltage) to full inversion (negative voltage). Though these properties have been effectively used in the Main Ring power supplies, they have not been extensively utilized for beam line magnet power supplies. Modifications to permit advancing phase angle sufficiently to permit inversion were made on TransRex 500 kW power supplies and Ling 55 k… more

Date: January 1, 1977

Creator: Trendler, R. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-speed rf data transmitter for the Fermilab booster beam damping system

A description is given of the design and realization of an rf transmitter system capable of driving very fast modulation envelopes (12 ns to 20 ns) representative of analog signals through long coaxial cables. The transmitter employs two amplitude-modulated carriers to transmit the amplitude and the polarity of the input drive signal simultaneously, via frequency-division multiplexing over an 800 MHz spectrum in the vhf and uhf bands.

Date: January 1, 1977

Creator: Jachim, S. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Report of the Census Task Force on beamline control system requirements

A special task force was appointed to study the experience with the present beamline control system at Fermilab and to make recommendations in this area. The charge of the committee and the list of its members are appended. In order to carry out its assignment, the committee conducted a series of meetings in which it discussed the controls situation in general and the best way to approach the user community. The various groups of users were identified, and a letter was written to representative… more

Date: October 2, 1986

Creator: Barsotti, E. J.; Bartlett, J. F.; Bogert, V. D.; Borcherding, F. O.; Butler, J.; Czarapata, P. C. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Suppression of transverse instabilities by fast feedback in the Fermilab booster

Systems to damp radial and vertical instabilities of individual rf bunches in the Fermilab Booster are being implemented. The positions of individual bunches are derived from stripline pickups. The position information is transmitted over a variable delay, amplified, and applied to deflectors after one almost complete revolution, 6.25 horizontal and 6.75 vertical betatron wavelengths downstream of the pickup. Motivation, system concepts, design considerations, and initial operating experience a… more

Date: January 1, 1977

Creator: Ankenbrandt, C.; Higgins, E. F. Jr. & Johnson, R. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Flux creep in a TEVATRON cable

We have measured the slow magnetization decay of a short sample (2.3 cm) of Tevatron cable in fields up to 0.3 T. The special susceptometer in development for these measurements is based on a commercial SQUID and is described in detail. The observed decay is logarithmic in time as expected from flux creep in the NbTi filaments. A strong correlation was found between the decay and the magnetization status of the sample. It is too early yet to present a quantitative correlation between what we ob… more

Date: August 22, 1988

Creator: Kuchnir, M. & Tollestrup, A.V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Logic and control module for the Fermilab booster beam damper

A logic and control module is included in the electronic system of the booster superdamper. This module produces a 9-bit digital word that controls the delay of beam bunch position information in the Fermilab booster synchrotron so that it arrives at the damping electrodes at the same time as the bunch of beam to be corrected. This delay word generator also has an output feature that only allows delay time decreases as the booster synchrotron frequency program increases monotonically. Such a fe… more

Date: January 1, 1977

Creator: Sandberg, B. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A high level, low frequency rf system for the acceleration of light ions in the AGS

A high level, low frequency rf system for accelerating light ions is described. This system accelerates ions from typically 7 to 8 MeV/nucleon to 200 MeV/nucleon. It operates at the 12th harmonic of the AGS rotation frequency, in a nominal range of 0.5 to 2.5 MHz. It preaccelerates the beam so that a synchronous ''bucket-to-bucket'' transfer can be made to the present AGS proton rf system for further acceleration up to energies of about 14 GeV/nucleon, covering the frequency range of 2.5 to 4.5… more

Date: January 1, 1987

Creator: Sanders, R.; Barton, D.; Frey, W.; Montemurro, P.; Otis, A.; Plotkin, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Operation of general purpose stepping motor controllers at the National Synchrotron Light Source

A prototype and four copies of a general purpose subsystem for mechanical positioning of detectors, samples, and beam line optical elements which constitute experiments at the National Synchrotron Light Source facility of Brookhaven National Laboratory have been constructed and placed into operation. Construction of a sixth subsystem is nearing completion. The subsystems effect mechanical positioning by controlling a set of stepping motors and their associated position encoders. The units are g… more

Date: October 1, 1986

Creator: Stubblefield, F.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Updated overview of the Tevatron control system

A single unified control system is used for all of the Fermilab accelerators and storage rings, from the LINAC to the Tevatron and antiproton source. A review of the general features is given - these include a 'host' system consisting of a number of minicomputers integrated with many distributed microprocessors in a variety of subsystems, usage of an in-house developed protocol, GAS, for communication between the two classes of machines, and a Parameter Page program, designed in conjunction wit… more

Date: October 1, 1987

Creator: Lucas, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department