73 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Brookhaven Rhic"  
Results: 1 - 24 next
open access

Relativistic heavy ion physics

Description: In 1992 a proposal by the Iowa State University experimental nuclear physics group entitled Relativistic Heavy Ion Physics'' was funded by the US Department of Energy, Office of Energy Research, for a three-year period beginning November 15, 1991. This is a progress report for the first six months of that period but, in order to give a wider perspective, we report here on progress made since the beginning of calendar year 1991. In the first section, entitled Purpose and Trends,'' we give some b… more
Date: January 1, 1992
Creator: Hill, J. C. & Wohn, F. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Two-photon physics and the coming generation of heavy ion colliders

Description: The possibilities for two-photon physics at the coming generation of heavy ion colliders is discussed. Particular attention is given to both e{sup +}, e{sup {minus}} production and resonance production of the Higgs particle. For e{sup +},e{sup {minus}} production the inadequacy of traditional perturbation theory is outlined, and through of the introduction of approximations valid for heavy ions it is shown how to sum a class of non-perturbative diagrams. The role of the nuclear form factor in s… more
Date: January 1, 1992
Creator: Rhoades-Brown, M.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

(Pion interferometry search for a phase change in hadronic matter in relativistic heavy ion collisions and its application to RHIC: Progress report)

Description: The purpose of this research is to assist in the investigation of the behavior of hadronic matter under extreme conditions. Specifically, this project intends to actively involve Creighton students and faculty in the search for indications of a phase transition from hadronic to quark matter. It is believed that the conditions necessary for the formation of this quark-gluon plasma include large energy densities over extended volumes. The technique of boson interferometry may prove to be the effe… more
Date: January 1, 1992
Creator: Cherney, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The PHENIX experiment at RHIC

Description: We review the current status of the design of a major RHIC detector which focuses primarily on the detection of dilepton pairs, direct photons, and selected hadron signals. The physics motivation and goals, the present conceptual design, and various technical issues are presented and discussed. The plan for continuing the design work over the next year is outlined.
Date: January 1, 1992
Creator: Aronson, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Silicon drift chamber studies for the RHIC STAR experiment

Description: The two-hit resolution of a silicon drift chamber is measured using a pulsed Nd:Yag laser and a time digitizer readout. The data is analyzed by forming the covariance matrix in time samples, and transforming to a matrix in amplitude and time variation of each of the two hits. The resolution of the two-hit separation is found to be better than 25 microns with a drift field of 530 V/cm and a separation of more than 500 microns, with the resolution increasing to 50 microns as the separation nears … more
Date: February 24, 1992
Creator: Humanic, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Transition crossing in the RHIC

Description: This report summarizes the study of various longitudinal problems pertaining to the transition-energy crossing in the proposed Relativistic Heavy Ion Collider. Scaling laws are provided for the effects of chromatic non-linearity, self-field mismatch, and microwave instability. It is indicated that the beam loss and bunch-area growth are mainly caused by the chromatic non-linear effort, which is enhanced by the space-charge force near transition. Computer simulation using the program. TIBETAN sh… more
Date: January 1, 1992
Creator: Wei, Jie.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The dependence of the dynamic aperture on the tune in RHIC

Description: This note studies the dependence of the dynamic aperture on the choice of the operating tune {nu}{sub x}, {nu}{sub y} in RHIC. Tracking studies for 1000 turns were done over the tune range {nu}{sub x} {approx equal} {nu}{sub y} = 28 to {nu}{sub x} {approx equal} {nu}{sub y} = 29.5. It was found that in each tune interval of length {Delta}{nu} = 0.5, e.g. {nu} = 28.5 to {nu} = 29, the dynamic aperture as a function of the tune has 5 peaks, each of which is a possible operating point. Each of the… more
Date: February 1, 1992
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Time-dependent hydrogen and helium pressure profiles in a long, cryogenically cooled tube, pumped at periodic intervals

Description: Many particle accelerators and colliders throughout the world make use of superconducting magnets to focus highly relativistic beams. These magnets are cooled to [approximately]4.2[degree]K For practical reasons, the beam pipes, encircled by the magnets, also operate at these cryogenic temperatures. This paper presents a theoretical model for determining pressure profiles, in space and time, stemming from either hydrogen or helium gas leak into the cold-bore tube with appendage pumps located at… more
Date: January 1, 1992
Creator: Hobson, J.P. (National Vacuum Technologies, Inc., Ontario (Canada)) & Welch, K.M. (Brookhaven National Lab., Upton, NY (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

RHIC spin collaboration

Description: This talk will describe RHIC, the spin-RHIC complex, give examples of our sensitivity, present our goals, and discuss the big remaining problem.
Date: January 1, 1992
Creator: Bunce, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design studies on the RHIC position monitor system

Description: The Relativistic Heavy Ion Collider (RHIC) under construction at Brookhaven National Laboratory will consist of two superconducting storage rings 3.8 km in circumference sharing one tunnel in a side by side configuration. After injection from the existing AGS, the collider will accelerate and store a range of ion species extending from protons through gold to energies of 250 GeV for protons and 100 GeV/nucleon for fully stripped gold ions. Storage times should exceed 10 hours. As in most modem … more
Date: September 1, 1992
Creator: Shea, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study on the results from SYNCH and MAD programs in calculating lattice with coordinate rotation

Description: In some lattices, it is necessary to introduce coordinate rotation around the beam axis, for example, in such a lattice, where the horizontal deflection and the change in level are mixed. the results from SYNCH and MAD programs in calculating such a lattice have been studied and some discrepancies have been found. The arrangement of this simple lattice is shown in these outputs. The dispersion functions are discussed first and then the Twiss Parameters ([beta]'s and [alpha]'s).
Date: December 1, 1992
Creator: Xu, Jianming.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Polarized protons at RHIC

Description: The approval for construction of the Relativistic Heavy Ion Collider (RHIC) provides a potential opportunity to collide polarized proton beams at energies up to 500 GeV in the center of mass and high luminosities approaching 2 {times} 10{sup 32}/cm{sup 2}/sec. This capability is enhanced by the fact that the AGS has already accelerated polarized protons and relies on the newly completed Accumulator/Booster for providing the required polarized proton intensity and a system of spin rotators (Sibe… more
Date: January 1, 1992
Creator: Makdisi, Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The electromagnetic calorimeter for the STAR experiment at RHIC

Description: The STAR detector at RHIC can be used both for searches for quark-gluon plasma and for high energy pp spin physics. An electromagnetic calorimeter is being planned which will be used for triggering on High pt direct gammas, e[sup [plus minus]], and the electromagnetic component of jets. Jets will be measured for both kinds of physics by using the electro-magnetic calorimeter and central TPC tracking. We describe some features of the fiber-tile calorimeter as it is presently being designed.
Date: January 1, 1992
Creator: Underwood, D.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sub 60 ps timing resolution using large area Silicon Avalanche Diodes

Description: The new generation of planned experiments in high energy and nuclear physics requires high pixel density time-of-flight detection systems which mark the occurrence of an event with sub-100 ps accuracy. Conventional fast phototubes and scintillators do not easily lend themselves to large scale mechanical and electrical integration and generally prove to be very expensive. As an alternative technology, we report on the development and optimization of Silicon Avalanche Diodes (AVDs). The project i… more
Date: October 1, 1992
Creator: Hauger, A.; Hirsch, A.; Porile, N.; Scharenberg, R.; Stringfellow, B.C.; Tincknell, M. (Purdue Univ., Lafayette, IN (United States). Dept. of Physics) et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Axial variations in the magnetic field of superconducting dipoles

Description: Periodic variations in the field along the axis have been observed in a large number of superconducting dipoles. Both long and short versions of the SSC magnet have been examined as well as prototypes for the RHIC accelerator and coils from the CBA and ISABELLE projects. This field oscillation is present in all the components of the field. The period of the longitudinal pattern was found to match the conductor transposition length over a wide range of pitches. The amplitude of variation increas… more
Date: January 1, 1992
Creator: Ghosh, A. K.; Robins, K. E. & Sampson, W. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The pumping of hydrogen and helium by sputter-ion pumps

Description: The pumping of hydrogen in diode and triode sputter-ion pumps is discussed. The type of cathode material used in these pumps is shown to have a significant impact on the effectiveness with which hydrogen is pumped. Examples of this include data for pumps with aluminum and titanium-alloy cathodes. Diode pumps with aluminum cathodes are shown to be no more effective in the pumping of hydrogen than in the pumping of helium. The use of titanium or titanium alloy anodes is also shown to measurably i… more
Date: January 1, 1992
Creator: Welch, K.M.; Pate, D.J. & Todd, R.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Brookhaven highlights

Description: This publication provides a broad overview of the research programs and efforts being conducted, built, designed, and planned at Brookhaven National Laboratory. This work covers a broad range of scientific disciplines. Major facilities include the Alternating Gradient Synchrotron (AGS), with its newly completed booster, the National Synchrotron Light Source (NSLS), the High Flux Beam Reactor (HFBR), and the RHIC, which is under construction. Departments within the laboratory include the AGS dep… more
Date: January 1, 1992
Creator: Rowe, M.S.; Cohen, A.; Greenberg, D. & Seubert, L. (eds.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The characterization and selection of superconductor wire and cable for RHIC

Description: This report describes the procedures used to select a single vendor for superconductor cable for the RHIC 80 mm dipole and quadrupole magnets, and some insertion dipoles with 110 mm aperture. Experience gained at BNL through involvement with the HERA and SSC Projects provided valuable Teaming experiences for this work. A performance specification was prepared and three qualified vendors were selected to complete a preproduction lot of 63,000 ft. of cable (approximately five multifilament billet… more
Date: January 1, 1992
Creator: Greene, A.F.; Garber, M.; Ghosh, A.K.; McChesney, D. & Morgillo, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Polarized protons in large center of mass collisions

Description: We present a scheme for polarized proton operation in the RHIC collider complex. For low energies the partial siberian snake project in the AGS is reviewed. As the energy is increased the difficulties of preserving the polarization also increases. A plan for preserving the polarization at high energies in RHIC using two Siberian Snakes is discussed. Spin rotators will be used around the collision points so that the helicity can be varied.
Date: December 31, 1992
Creator: Tepikian, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The dependence of the dynamic aperture on the tune in RHIC

Description: This note studies the dependence of the dynamic aperture on the choice of the operating tune {nu}{sub x}, {nu}{sub y} in RHIC. Tracking studies for 1000 turns were done over the tune range {nu}{sub x} {approx_equal} {nu}{sub y} = 28 to {nu}{sub x} {approx_equal} {nu}{sub y} = 29.5. It was found that in each tune interval of length {Delta}{nu} = 0.5, e.g. {nu} = 28.5 to {nu} = 29, the dynamic aperture as a function of the tune has 5 peaks, each of which is a possible operating point. Each of the… more
Date: February 1, 1992
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen