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FINAL REPORT. RELIABILITY TEST: X-RAY RING EXIT CHAMBERS CROTCH RADIATION ABSORBERS.

Description: This report details the efforts by engineers at the National Synchrotron Light Source (NSLS) of Brookhaven National Laboratory (BNL) to evaluate the reliability of water-cooled radiation absorbers used in the NSLS X-ray ring. These absorbers are part of the 16 dipole vacuum chambers which comprise the arc sections of the ring. They are located at the intersections (crotch) of the beamline exit ports with the electron beam chamber, and are commonly referred to as "crotches". The purpose of these efforts was to demonstrate the reliability of the crotches under operating conditions that the crotches will be subjected to over the entire expected life of the ring. The efforts described include engineering calculations, finite element analysis, conceptual design for a reliability test, test implementation and descriptions, results and conclusions related to these analyses and tests.
Date: April 9, 1999
Creator: Lynch, D. R.
Partner: UNT Libraries Government Documents Department

Hot coal gas desulfurization with manganese-based sorbents

Description: The focus of work being performed on Hot Coal Gas Desulfurization is primarily in the use of zinc ferrite and zinc titanate sorbents; however, prior studies at the US Steel Fundamental Research Laboratories in Monroeville, PA, by E.T. Turkdogan indicated that an alternate sorbent, manganese dioxide-containing ore in mixture with alumina (75 wt % ore + 25 wt % Al{sub 2}/O{sub 3}) may be a viable alternative to zinc-based sorbents. Manganese, for example, has a lower vapor pressure in the elemental state than zinc hence it is not as likely to undergo depletion from the sorbent surface upon loading and regeneration cycles. Also manganese oxide is less readily reduced to the elemental state than iron hence the range of reduction potentials for oxygen is somewhat greater than for zinc ferrite. In addition, thermodynamic analysis of the manganese-oxygen-sulfur system shows it to be less amenable to sulfation than zinc ferrite. Potential also exists for utilization of manganese higher temperatures than zinc ferrite or zinc titanate. This presentation gives the thermodynamic background for consideration of manganese-based sorbents as an alternative to zinc ferrite. To date the work which has been in progress for nine months is limited at this stage to thermogravimetric testing of four formulations of manganese-alumina sorbents to determine the optimum conditions of pelletization and induration to produce reactive pellets.
Date: September 1, 1993
Creator: Lynch, D. & Hepworth, M. T.
Partner: UNT Libraries Government Documents Department

Thermal cycle time simulation analysis of a crotch photon absorber in an x-ray storage ring

Description: The National Synchrotron Light Source is an electron accelerator facility at Brookhaven National Laboratory. The aim of this study is to test the capability of certain components in the accelerator to operate under these increased currents using Finite Element Analysis and prototype experimentation. Research efforts will be devoted to determine whether the component fails due to operating the beam at higher current levels. It has been concluded that certain components in the accelerator might be subject to failure under these upgrades. Among these components is the exit chamber crotch component, which is the direct link between the actual accelerator storage ring and the beam ports. This component is cyclically subjected to a high temperature and its design life as this temperature is increased, is under question. Analyzing this component through finite element analysis as well as simulating a prototype beam on the actual part in experiment is essential in testing and verifying whether this component needs upgrading or is capable of handling the increased heat load.
Date: August 1, 1998
Creator: Morgan, J.; Lynch, D. & Woodle, M.
Partner: UNT Libraries Government Documents Department

Reliability test: X-ray ring exit chambers crotch radiation absorbers. Final report

Description: This report details the efforts by engineers at the National Synchrotron Light Source (NSLS) of Brookhaven National Laboratory (BNL) to evaluate the reliability of water-cooled radiation absorbers used in the NSLS X-ray ring. These absorbers are part of the 16 dipole vacuum chambers which comprise the arc sections of the ring. They are located at the intersections (crotch) of the beamline exit ports with the electron beam chamber, and are commonly referred to as crotches. The purpose of these efforts was to demonstrate the reliability of the crotches under operating conditions that the crotches will be subjected to over the entire expected life of the ring. The efforts described include engineering calculations, finite element analysis, conceptual design for a reliability test, test implementation and descriptions, results and conclusions related to these analyses and tests.
Date: April 9, 1999
Creator: Lynch, D.R. & Morgan, J.
Partner: UNT Libraries Government Documents Department

THERMAL CYCLE TIME SIMULATION ANALYSIS OF A CROTCH PHOTON ABSORBER IN AN X-RAY STORAGE RING

Description: The National Synchrotron Light Source is an electron accelerator facility at Brookhaven National Laboratory. To improve on the brightness of its synchrotron radiation it is important that this accelerator operates at its maximum design currents of excess of 500 mA at 2.5 GeV. Currently, it is running at 350 mA at the same energies of 2.5 GeV. With on-going developments and advancements in beam technology instrumentation, the National Synchrotron Light Source looks to maintain its position at the forefront of world class beam accelerators. But in order to accomplish this, this accelerator must run at higher currents. The aim of this study is to test the capability of certain components in the accelerator to operate under these increased currents using Finite Element Analysis and prototype experimentation. Research efforts will be devoted to determine whether the component fails due to operating the beam at higher current levels. Full studies of the component's performance will be conducted along with any necessary improvements needed to operate at these levels. It has been concluded that certain components in the accelerator might be subject to failure under these upgrades. Among these components is the exit chamber crotch component, which is the direct link between the actual accelerator storage ring and the beam ports. This component is cyclically subjected to a high temperature and its design life as this temperature is increased, is under question. Analyzing this component through finite element analysis as well as simulating a prototype beam on the actual part in experiment is essential in testing and verifying whether this component needs upgrading or is capable of handling the increased heat load.
Date: August 1998
Creator: Morgan, J.; Lynch, D. & Woodle, M.
Partner: UNT Libraries Government Documents Department

MECHANICAL DESIGN OF NSLS MINI - GAP UNDULATOR (MGU)

Description: The mechanical design considerations are discussed with respect to the currently installed X-13 and future X-29 MGU. Comparisons to the previous 2 generations of variable small-gap undulator evolution in the NSLS X-ray ring are made and design improvements noted. The design requirements and mechanical difficulties for holding, positioning and driving the magnetic arrays are explored. Structural, thermal and electrical considerations which influenced the design are then analyzed. The mechanical performance of the MGU currently installed at X-13 is examined and future installations and enhancements are presented.
Date: September 5, 2002
Creator: LYNCH,D. & RAKOWSKY,G.
Partner: UNT Libraries Government Documents Department

NSLS IN-VACUUM UNDULATORS AND MINI-BETA STRAIGHTS.

Description: We review the work carried out in the X13 R&D Straight Section of the NSLS X-Ray Ring on small gap in-vacuum undulators (IVUNs). Then we discuss: (1) plans to replace the pure permanent magnet undulator in X13 by a hybrid design providing stronger magnetic fields, enhancing the tunability of the device; (2) plans to install hybrid IVUNs in the two RF straights of the X-Ray Ring, increasing the number of insertion devices in the XRay Ring to eight; (3) the possibility of reducing the vertical beta function in the X13 straight from 0.33 m down to 0.16 m. This reduction in beta function would allow us to decrease the usable undulator gap from 3mm down to 2mm, further increasing the tuning range.
Date: June 18, 2001
Creator: RAKOWSKY,G.; LYNCH,D.; BLUM,E.B. & KRINSKY,S.
Partner: UNT Libraries Government Documents Department

CHAMBER MOTION MEASUREMENTS AT THE NSLS X-RAY RING.

Description: Work has been ongoing at the NSLS to improve the orbit stability of the X-Ray Ring by accounting for the thermal motion of the vacuum chamber, which supports the electron beam position monitors (BPMs). In-situ contact measurements of the vacuum chamber motion have been carried out using support stands that have been designed and extensively tested to reduce errors associated with thermal changes in the stands themselves. Using this chamber motion as a correction to the orbit motion measured by the BPMs, the precise location of the radiation beam can be predicted. These predictions are compared with actual radiation beam measurements on the experimental floor, and with predictions based solely on BPM measurements of the electron beam position. This paper reviews this work including stand design and performance, chamber motion measurements, predictions based on these data, and results.
Date: March 29, 1999
Creator: SOLOMON,L.; LYNCH,D.; SAFRANEK,J. & SINGH,O.
Partner: UNT Libraries Government Documents Department

Beryllium window for synchrotron light sources

Description: As part of an on-going upgrade program at the National Synchrotron Light Source, a parametric study of rectangular flat and curved beryllium windows of varying thickness and heights and under varying thermal loading was undertaken. The study consisted of a series of 2D and 3D thermal stress finite element analyses to determine the relative benefit of various combinations of parameters with respect to the windows` ability to withstand thermal loads. This study includes evaluation of fixed versus flexible mounting of flat and curved beryllium windows. Buckling analyses for both types of mountings are also included.
Date: October 1, 1996
Creator: Lynch, D.R.; Berman, L.; Montanez, P.; Pjerov, S.; Stefan, P. & Woodle, M.
Partner: UNT Libraries Government Documents Department

Molecular dynamics simulations of dense plasmas

Description: We have performed quantum molecular dynamics simulations of hot, dense plasmas of hydrogen over a range of temperatures(0.1-5eV) and densities(0.0625-5g/cc). We determine the forces quantum mechanically from density functional, extended Huckel, and tight binding techniques and move the nuclei according to the classical equations of motion. We determine pair-correlation functions, diffusion coefficients, and electrical conductivities. We find that many-body effects predominate in this regime. We begin to obtain agreement with the OCP and Thomas-Fermi models only at the higher temperatures and densities.
Date: December 31, 1993
Creator: Collins, L. A.; Kress, J. D.; Kwon, I.; Lynch, D. L. & Troullier, N.
Partner: UNT Libraries Government Documents Department

Design and construction a full copper photocathode RF gun

Description: The design and construction of an all copper S-band one-and-half cell photocathode electron gun without a choke joint is described. The methods utilized to determine the field balance at the operational frequency without usage of the bead pulling perturbation measurement is given together wit the computational data.
Date: July 1, 1993
Creator: Wang, X. J.; Batchelor, K.; Ben-Zvi, I.; Lynch, D.; Sheehan, J. & Woodle, M.
Partner: UNT Libraries Government Documents Department

A superconducting wiggler magnet for the NSLS x-ray ring

Description: The superconducting 5 pole, 5 Tesla wiggler which has been operating in the X-17 straight section of the x-ray storage ring at the National Synchrotron Light Source (NSLS) since 1989 will soon be replaced by a new wiggler being built by Oxford Instruments with lower operating costs, higher reliability, and greater performance. The new wiggler has three modes of operation: the full wiggler with 11 poles producing 3.0 T, the partial wiggler with 5 poles at 4.7 T, and the wavelength shifter with a single pole producing 5.5 T. The full wiggler, optimized for the digital subtraction radiography program, will produce the same x-ray flux at the 33 KeV iodine K-edge as the existing wiggler operating at 4.7 T but will reduce the higher energy harmonics delivered to the target. The partial wiggler will deliver the same flux for solid state physics experiments as the existing wiggler, and the wavelength shifter will provide an elliptically polarized x-ray beam that is not now available.
Date: July 1, 1997
Creator: Blum, E.B.; Lynch, D.R. & Singh, O.V.
Partner: UNT Libraries Government Documents Department

Report of the terawatt laser pressure vessel committee

Description: In 1995 the ATF project sent out an RFP for a CO2 Laser System having a TeraWatt output. Eight foreign and US firms responded. The Proposal Evaluation Panel on the second round selected Optoel, a Russian firm based in St. Petersburg, on the basis of the technical criteria and cost. Prior to the award, BNL representatives including the principal scientist, cognizant engineer and a QA representative visited the Optoel facilities to assess the company's capability to do the job. The contract required Optoel to provide a x-ray preionized high pressure amplifier that included: a high pressure cell, x-ray tube, internal optics and a HV pulse forming network for the main discharge and preionizer. The high-pressure cell consists of a stainless steel pressure vessel with various ports and windows that is filled with a gas mixture operating at 10 atmospheres. In accordance with BNL Standard ESH 1.4.1 ''Pressurized Systems For Experimental Use'', the pressure vessel design criteria is required to comply with the ASME Boiler and Pressure Vessel Code In 1996 a Preliminary Design Review was held at BNL. The vendor was requested to furnish drawings so that we could confirm that the design met the above criteria. The vendor furnished drawings did not have all dimensions necessary to completely analyze the cell. Never the less, we performed an analysis on as much of the vessel as we could with the available information. The calculations concluded that there were twelve areas of concern that had to be addressed to assure that the pressure vessel complied with the requirements of the ASME code. This information was forwarded to the vendor with the understanding that they would resolve these concerns as they continued with the vessel design and fabrication. The assembled amplifier pressure vessel was later hydro tested to 220 psi (15 Atm) ...
Date: September 25, 2000
Creator: Woodle, M.H.; Beauman, R.; Czajkowski, C.; Dickinson, T.; Lynch, D.; Pogorelsky, I. et al.
Partner: UNT Libraries Government Documents Department

Structural load inventory database for the Kansas City Plant

Description: This report discusses a structural load inventory database (LID) which has been developed to support configuration management at the DOE Kansas City Plant (KCP). The objective of the LID is to record loads supported by the plant structures and to provide rapid assessments of the impact of future facility modifications on structural adequacy. Development of the LID was initiated for the KCP`s Main Manufacturing Building. Field walkdowns were performed to determine all significant loads supported by the structure, including the weight of piping, service equipment, etc. These loads were compiled in the LID. Structural analyses for natural phenomena hazards were performed in accordance with UCRL-15910. Software to calculate demands on the structural members due to gravity loads, total demands including both gravity and seismic loads, and structural member demand-to-capacity ratios were also developed and integrated into the LID. Operation of the LID is menu-driven. The LID user has options to review and print existing loads and corresponding demand-to-capacity ratios, and to update the supported loads and demand-to-capacity ratios for any future facility modifications.
Date: October 1, 1993
Creator: Hashimoto, P. S.; Johnson, M. W.; Nakaki, D. K.; Wilson, J. J.; Lynch, D. T. & Drury, M. A.
Partner: UNT Libraries Government Documents Department

Site specific seismic hazard analysis at the DOE Kansas City Plant

Description: A site specific seismic hazard analysis is being conducted for the Kansas City Plant to support an on-going structural evaluation of existing buildings. This project is part of the overall review of facilities being conducted by DOE. The seismic hazard was probabilistically defined at the theoretical rock outcrop by Lawrence Livermore National Laboratory. The USArmy Engineer Waterways Experiment Station conducted a subsurface site investigation to characterize in situ S-wave velocities and other subsurface physical properties related to the geology in the vicinity of the Main Manufacturing Building (MMB) at the Bannister Federal Complex. The test program consisted of crosshole S-wave, seismic cone penetrometer testing,and laboratory soil analyses. The information acquired from this investigation was used in a site response analysis by City College of New York to determine the earthquake motion at grade. Ground response spectra appropriate for design and evaluation of Performance Category 1 and 2 structures, systems, and components were recommended. Effects of seismic loadings on the buildings will be used to aid in designing any structural modifications.
Date: October 1, 1995
Creator: Lynch, D.T.; Drury, M.A.; Meis, R.C.; Bieniawski, A.; Savy, J.B.; Llopis, J.L. et al.
Partner: UNT Libraries Government Documents Department

A superconducting short period undulator for a harmonic generation FEL experiment

Description: A three stage superconducting (SC) undulator for a high gain harmonic generation (HGE) FEL experiment in the infrared is under construction at the NSLS in collaboration with Grumman Corporation. A novel undulator technology suitable for short period (6--40mm) undulators will be employed for all three stages, the modulator, the dispersive section and the radiator. The undulator triples the frequency of a 10.4[mu]m CO[sub 2] seed laser. So far a 27 period (one third of the final radiator) prototype radiator has been designed, built and tested.
Date: January 1, 1993
Creator: Ingold, G.; Solomon, L.; Ben-Zvi, I.; Krinsky, S.; Li, D.; Lynch, D. et al.
Partner: UNT Libraries Government Documents Department

High resolution-angle resolved photoemission studies of high temperature superconductors

Description: Recent photoemission studies of Y 123 and Bi 2212 performed with high energy and angular resolution have provided detailed information on the nature of the states near the Fermi level. Measurements of the superconducting gap, band dispersion, and the density of states near the Fermi level in the normal state all support a Fermi liquid description of these materials. 5 refs., 4 figs.
Date: August 1, 1989
Creator: Olson, C.G.; Liu, R.; Lynch, D.W.; Veal, B.W.; Chang, Y.C.; Jiang, P.Z. et al.
Partner: UNT Libraries Government Documents Department

TECHNICAL DESIGN REPORT FOR A NOSECONE CALORIMETER (NCC) FOR THE PHENIX EXPERIMENT.

Description: A remarkable result has emerged from the first several years of data taking at RHIC--the high temperature and density phase of QCD matter created in heavy ion collisions at RHIC is best described as a near perfect fluid--the strongly interacting Quark-Gluon-Plasma (sQGP). This state is characterized by a small viscosity to entropy ratio, and a high density of color charges which induces huge energy losses of partons transversing the medium. The task for the future is to understand the characteristics of the sQGP, and perhaps more importantly--to gain some insight into how and why such a medium is created. The PHENIX detector has been one of the primary experimental tools at RHIC; in particular the electromagnetic calorimeter has been a critical component of many of the measurements leading to this discovery. The coverage of the present PHENIX electromagnetic calorimeter is rather limited, covering half the azimuth and -0.35< {eta} <0.35 Further progress requires larger coverage of electromagnetic calorimetry, both to increase the rate for low cross section phenomena, and to cover a broader range of pseudorapidity to study the rapidity dependence of the medium. A pair of Nosecone Calorimeters (NCC) has been designed covering both positive and negative rapidity regions 1< |{eta}| <3 of the PHENIX detector. The NCC will make it possible to perform tomographic studies of the jet energy dependence of energy loss and medium response, by using direct photons as trigger particles over a large rapidity range. The technique of correlating trigger hadrons with low momentum hadrons has been powerfully exploited at RHIC to study the evolution of back to back jets [1, 2] and hence the response of the medium. The NCC will make it possible to do such studies using direct photons as the trigger particles. The direct photon in such ''photon-jet'' events tags the ...
Date: August 1, 2007
Creator: EXPERIMENT, PHENIX; OBRIEN,E.; BOOSE, S.; CHIU, M.; JOHNSON, B.M.; KISTENEV, E.P. et al.
Partner: UNT Libraries Government Documents Department

A superconducting short period undulator for a harmonic generation FEL experiment

Description: A three stage superconducting (SC) undulator for a high gain harmonic generation (HGE) FEL experiment in the infrared is under construction at the NSLS in collaboration with Grumman Corporation. A novel undulator technology suitable for short period (6--40mm) undulators will be employed for all three stages, the modulator, the dispersive section and the radiator. The undulator triples the frequency of a 10.4{mu}m CO{sub 2} seed laser. So far a 27 period (one third of the final radiator) prototype radiator has been designed, built and tested.
Date: July 1, 1993
Creator: Ingold, G.; Solomon, L.; Ben-Zvi, I.; Krinsky, S.; Li, D.; Lynch, D. et al.
Partner: UNT Libraries Government Documents Department