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D-0 North End Cap Calorimeter Cold Test Results
The North endcap calorimeter vessel was recieved on July 1, 1990. A cooldown of the pressure vessel with liquid nitrogen was performed on July 10-11 to check the vessel's integrity. With the pressure vessel cold, the insulating vacuum was monitored for leaks. Through out the testing, the insulating vacuum remained good and the vessel passed the test. The cold test was carried out per the procedures of D-Zero engineering note 3740.220-EN-250. The test was very similar to the cold test performed on the Central Calorimeter in October of 1987. Reference D-Zero engineering notes 3740.210-EN-122, 3740.000-EN107, and 3740.210-EN-110 for information about the CC cold test. The insulating vacuum space was pumped on while equipment was being connected to the pressure vessel. Two hours after starting to pump with the blower the vacuum space pressure was at about 210 microns. Pumping on the vacuum space for the next 15 hours showed no progress and a leak detector was connected to the pumping line. A leak check showed a leak in a thermocouple feedthru on the vacuum space relief plate. After fixing the leak, the pressure dropped to 16 microns in less than one hour. A rate of rise test was performed starting …
Date:
August 2, 1990
Creator:
Michael, J.
Object Type:
Report
System:
The UNT Digital Library
D-0 South End Cap Calorimeter Cold Test Results
The South endcap calorimeter vessel was moved into Lab A on Sept. 18, 1990. A cooldown of the pressure vessel with liquid nitrogen was performed on Sept. 26 to check the vessel's integrity. With the pressure vessel cold, the insulating vacuum was monitored for leaks. Through out the testing, the insulating vacuum remained good and the vessel passed the test. The cold test was carried out per the procedures of D-Zero engineering note 3740.220-EN-250. The test was very similar to the cold test performed on the Central Calorimeter in October of 1987. The test of the ECS was performed in the same manner using the same equipment as the ECN cold test. Reference D-Zero engineering notes 3740.210-EN-122, 3740.000-EN-I07, and 3740.210-EN-II0 for information about the CC cold test. Reference EN-260 for the results of the ECN cold test. The insulating vacuum space was pumped on while equipment was being connected to the pressure vessel. Two hours after starting to pump with the blower the vacuum space pressure was at about 40 microns. The pumping continued overnight (another 16 hours). In the morning the pressure was 11.5 microns. A rate of rise test was performed. With the pump valved off, the pressure …
Date:
November 26, 1990
Creator:
Rucinski, R.
Object Type:
Report
System:
The UNT Digital Library
A 1. 5--4 Kelvin detachable cold-sample transfer system: Application to inertially confined fusion with spin-polarized hydrogens fuels
A compact cold-transfer apparatus for engaging and retrieving samples at liquid helium temperatures (1.5--4K), maintaining the samples at such temperatures for periods of hours, and subsequently inserting them in diverse apparatuses followed by disengagement, is described. The properties of several thermal radiation-insulating shrouds, necessary for very low sample temperatures, are presented. The immediate intended application is transportable target-shells containing highly spin-polarized deuterons in solid HD or D{sub 2} for inertially confined fusion (ICF) experiments. The system is also valuable for unpolarized high-density fusion fuels, as well as for other applications which are discussed. 9 refs., 6 figs.
Date:
January 1, 1990
Creator:
Alexander, N.; Barden, J.; Fan, Q. & Honig, A.
Object Type:
Report
System:
The UNT Digital Library
2-D Axisymmetric Line Transport
The methods used in the ALTAIR code for computing the transfer of spectral line radiation in two-dimensional axially-symmetric geometry are described. ALTAIR uses a variable-Eddington-tensor approach, in which the transfer equation of non-coherent line scattering is written in moment form, and the moments are closed with an assumed tensor relating the monochromatic pressure tensor and energy density; this Eddington tensor is obtained self-consistently using an accurate angle-dependent solution of the transfer equation. The finite element method for solving the moment system, and the discontinuous finite element method for solving the S{sub n} equation of transfer are described. Two applications of the method are discussed: line formation in uniform cylinders with different length-diameter ratios, and monochromatic transfer on an irregular x-y mesh (the Mordant test problem). 13 refs., 2 figs.
Date:
November 20, 1990
Creator:
Castor, John I.; Dykema, Pieter G. & Klein, Richard I.
Object Type:
Article
System:
The UNT Digital Library
2 MW 110 GHz ECH heating system for DIII-D
A 2 MW 110 GHz ECH system using Varian 0.5 MW gyrotrons is under construction for use on the DIII-D tokamak by late 1991. Most of the components are being design and fabricated at General Atomics, including the gyrotron tanks, superconducting magnets, and transmission line. These components are intended for operation with 10 second pulses and, in the future, with 1 MW gyrotrons. 6 refs., 5 figs.
Date:
September 1990
Creator:
Moeller, C.; Prater, R.; Callis, R.; Remsen, D.; Doane, J.; Cary, W. et al.
Object Type:
Article
System:
The UNT Digital Library
3-D computer simulations of EM fields in the APS vacuum chamber: Part 1, Frequency-domain analysis
The vacuum chamber proposed for the storage ring of the 7-GeV Advanced Photon Source (APS) basically consists of two parts: the beam chamber and the antechamber, connected to each other by a narrow gap. A sector of 1-meter-long chamber with dosed end plates, to which are attached the 1-inch-diameter beampipes centered at the beam chamber, has been built for experimental purposes. The 3-D code MAFIA has been used to simulate the frequency-domain behaviors of EM fields in this setup. The results are summarized in this note and are compared with that previously obtained from 2-D simulations and that from network analyzer measurements. They are in general agreement. A parallel analysis in the time-domain is reported in a separate note. The method of our simulations can be briefly described as follows. The 1-inch diameter beampipes are terminated by conducting walls at a length of 2 cm. The whole geometry can thus be considered as a cavity. The lowest RF modes of this geometry are computed using MAFIA. The eigenfrequencies of these modes are a direct output of the eigenvalue solver E3, whereas the type of each mode is determined by employing the postprocessor P3. The mesh sizes are chosen such that …
Date:
September 4, 1990
Creator:
Chou, W. & Bridges, J.
Object Type:
Report
System:
The UNT Digital Library
3-D Depth Migration via McClellan Transformations
Three-dimensional seismic wavefields may be extrapolated in depth, one frequency at a time, by two-dimensional convolution with a circularly symmetric, frequency- and velocity-dependent filter. This depth extrapolation, performed for each frequency independently, lies at the heart of 3-D finite-difference depth migration. The computational efficiency of 3-D depth migration depends directly on the efficiency of this depth extrapolation. McClellan transformations provide an efficient method for both designing and implementing two-dimensional digital filters that have a particular form of symmetry, such as the circularly symmetric depth extrapolation filters used in 3-D depth migration. Given the coefficients of one-dimensional, frequency- and velocity-dependent filters used to accomplish 2-D depth migration, McClellan transformations lead to a simple and efficient algorithm for 3-D depth migration. 21 refs., 12 figs.
Date:
1990~
Creator:
Hale, D.
Object Type:
Report
System:
The UNT Digital Library
3 Dimensional radiation transport in dispersive media
In plasmas the collective motion of free electrons affects the propagation of radiation by bending the light ray trajectory. The closer the light wave frequency is to the electron plasma frequency in value, the more pronounced the effect. We will present the results of radiation transport calculations in 3 spatial dimensions in the refractive plasma environment and compare the calculation to one done where the ray bending has been neglected (straight line ray paths). We also present the numerical method used for the refractive transport. 4 refs., 5 figs.
Date:
November 1, 1990
Creator:
Mayle, R.W.
Object Type:
Article
System:
The UNT Digital Library
3 pièces pour double basse et bande
Access:
Use of this item is restricted to the UNT Community
Recording of Orlando Jacinto Garcia's 3 pièces pour double basse et bande. Was written for bassist Robert Black and completed in the summer of 1990. The tape part was made using the bass player's recordings of brief musical pieces (i.e. tremolos, harmonics...) which were then digitized by the composer, sometimes transforming and mixing the material in layers of sound. The second of the three pieces is characteristic of a genre of glissandos, register changes, and also long holds both on tape and for the live double bass part. Great care as to the correctness of tone and the control of timbre is necessary on the part of the double bass player.
Date:
1990
Creator:
García, Orlando Jacinto
Object Type:
Sound
System:
The UNT Digital Library
[3 Women and a Man Talking]
Photograph of three women and a man talking. One of the women is wearing a Russian gold star and holding a pen.
Date:
1990~
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
A 4. pi. tracking TPC magnetic spectrometer for RHIC
The primary physics objective of the 4{pi} TPC magnetic spectrometer proposal is to search for the Quark-Gluon Plasma. In previous workshops we have discussed what the possible hadronic signatures of such a state of matter would be. Succinctly, the QGP is a direct prediction of non-perturbative QCD. Therefore the question of the existence of this new state of matter bears directly on the validity of non-perturbative QCD. However, since non-perturbative QCD has never been established, it is apparent that what may await us is a host of new phenomena that will go beyond the standard model.
Date:
January 1, 1990
Creator:
Danby, G.; Eiseman, S. E.; Etkin, A.; Foley, K. J.; Hackenburg, R. W.; Longacre, R. S. et al.
Object Type:
Article
System:
The UNT Digital Library
A 5-cm dipole for the SSC-DE-1
A 5cm SSC superconducting dipole that develops 6.6 tesla at 5790 A is proposed. The two layer magnet has 12% more transfer function than the present design as a result of using thin collars and close in'' iron. The thin collars provide precise positioning of the coils; they also provide minimum prestress (perhaps 2000 psi) as aid for magnet assembly. A welded skin around the iron provides the final prestress and shapes and the coil geometry. A prestressed aluminum bar placed between the vertically split iron yokes provides precise control of the gap between yokes halves and is designed to allow gap to close tightly during cooldown so that there is no decrease of prestress. In order to reduce the effect of iron saturation on the field multipoles the iron ID has been optimized to an elliptical shape. The coil inner layer is a 30 strand cable with 1.3:1 cu/sc. The outer layer is a 36 strand cable wit 1.8:1 cu/sc. At the operating field of 6.6 tesla the current density in the copper is 666 A/mm{sup 2} and 760 A/mm{sup 2} in the inner and outer layers respectively. The magnet short sample performance is limited by the inner layer. …
Date:
April 30, 1990
Creator:
Caspi, S.
Object Type:
Report
System:
The UNT Digital Library
9-1-1 Caller, Volume 2, Number 2, May/June 1990
Bimonthly newsletter of the Texas Advisory Commission on State Emergency Communications discussing news and activities of the organization as well as other information related to 9-1-1 services and other emergency communication within Texas.
Date:
May 1990
Creator:
Texas. Advisory Commission on State Emergency Communications.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
9-1-1 Caller, Volume 2, Number 3, July/August 1990
Bimonthly newsletter of the Texas Advisory Commission on State Emergency Communications discussing news and activities of the organization as well as other information related to 9-1-1 services and other emergency communication within Texas.
Date:
July 1990
Creator:
Texas. Advisory Commission on State Emergency Communications.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
[12 panel handmade paper and silk artwork]
The artwork consists of twelve panels in varying hues of pinks, blues, browns with some angular textured lines resembling furrows and some blue lines resembling water run through and across the panels.
Date:
1990~
Creator:
Spear, Shigeko
Object Type:
Artwork
System:
The UNT Digital Library
[13 Women with Military Medals]
Photograph of thirteen unidentified women wearing military medals on their jackets sitting and standing in two rows; behind them red and white decorative paneling and a blue stained glass window are visible in the background.
Date:
1990
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
A 15 MeV proton diagnostic for DIII-D
A 15 MeV proton diagnostic that is patterned after the ASDEX proton probe is presently being fabricated for the DIII-D tokamak. A bellows assembly inserts a silicon detector into the vacuum for plasma operation and retracts it for baking. The detector preamplifier is situated in a reentrant tube (at atmosphere) beside the detector; electrically, the whole assembly is referenced to vessel potential. Orbit calculations in realistic magnetic field geometries predict a proton detection efficiency of O(10{sup {minus}7}). The diagnostic will be used for burnup studies at high {beta} and particle transport studies in the H-mode. 25 refs., 4 figs.
Date:
October 1, 1990
Creator:
Duong, Hau & Heidbrink, W.W. (California Univ., Irvine, CA (USA))
Object Type:
Article
System:
The UNT Digital Library
16 Channel ECL repeater
This paper describes the circuits of a 16 channel CL repeater. (LSP)
Date:
March 7, 1990
Creator:
Graupman, Dan
Object Type:
Report
System:
The UNT Digital Library
24 Hour pumping test of production well 905-120P
As part of the Savannah River Site (SRS) Aquifer Characterization Program, the Environmental Sciences Section (ESS) of the Savannah River Laboratory (SRL) is attempting to determine the water transmitting characteristics of the different aquifer units underlying the SRS by conducting single well pumping tests on wells installed as part of the SRS Baseline Hydrogeologic Investigation. In April 1990, while performing the single well pumping test, an opportunity became available to collect data on aquifer properties utilizing a production well and observation wells. At this time the US Army Corps of Engineers (COE) was completing a new production well (well 905-120P) in P-Area. This well, located in close proximity to well cluster P-24, was to undergo a 24-hour performance test by the COE. ESS arranged with the subcontractor working on the Single Well pumping Test project. Dames Moore, to instrument the appropriate observation wells and to coordinate data collection with the COE.
Date:
December 1, 1990
Creator:
Bledsoe, H.W.
Object Type:
Report
System:
The UNT Digital Library
24 Hour pumping test of production well 905-120P
As part of the Savannah River Site (SRS) Aquifer Characterization Program, the Environmental Sciences Section (ESS) of the Savannah River Laboratory (SRL) is attempting to determine the water transmitting characteristics of the different aquifer units underlying the SRS by conducting single well pumping tests on wells installed as part of the SRS Baseline Hydrogeologic Investigation. In April 1990, while performing the single well pumping test, an opportunity became available to collect data on aquifer properties utilizing a production well and observation wells. At this time the US Army Corps of Engineers (COE) was completing a new production well (well 905-120P) in P-Area. This well, located in close proximity to well cluster P-24, was to undergo a 24-hour performance test by the COE. ESS arranged with the subcontractor working on the Single Well pumping Test project. Dames & Moore, to instrument the appropriate observation wells and to coordinate data collection with the COE.
Date:
December 1, 1990
Creator:
Bledsoe, H. W.
Object Type:
Report
System:
The UNT Digital Library
30+ years of plasma simulation
None
Date:
December 19, 1990
Creator:
Langdon, B.
Object Type:
Article
System:
The UNT Digital Library
[38 Adulted Building]
Photograph of the 38 Adulted Building in Laredo, Texas.
Date:
December 1, 1990
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
A 40 mm bore quadrupole magnet for the SSC
A 40 mm bore quadrupole magnet design, called QC'', has been made for the SSC with the following parameters: 208 T/m gradient at 6500A, 2-layer cos 2 {theta}'' winding arrangement with 30 strand cable and one spacer wedge per coil. Structural support is provided by self-supporting interlocking collars; two types of symmetrical laminations are pre-assembled into collar packs for ease of assembly. This paper will describe the design of a prototype quadrupole magnet for the SSC and preliminary tests results on 1 m models. 7 refs., 6 figs., 2 tabs.
Date:
September 1, 1990
Creator:
Taylor, C.E.; Barale, P.; Caspi, S.; Dell'Orco, D.; Fritz, D.; Gilbert, W.S. et al.
Object Type:
Article
System:
The UNT Digital Library
50 kA, 50 kV DC international and switching systems for the Los Alamos ZTH experiment
Los Alamos National Laboratory has completed the engineering design and development for the high power electrical switching networks for the ZTH experiment. ZTH is Reversed Field Pinch (RFP) plasma experiment with a 4 MA plasma current capability. Power to the ohmic heating (OH), equilibrium field (EF), and toroidal field (TF) coils will be provided from a 1.43 GVA turbo-alternator, which has over 600 MJ of extractable energy. The DC interrupting switch will handle 2.4 GVA, 150 MJ during initial machine operations. An additional 150 to 200 MJ are required for flat-topping the plasma current. A new ultra-high power switch, designed and tested at Los Alamos, will be used to reconfigure the power supply connections so that the supplies can be switched from parallel to series operation. In this manner, the same supplies can be used to charge and then flat-top the OH coils. The inexpensive cost of these switches results in significant economy of power supplies and systems. Detailed engineering information will be presented for the family of 25 kA and 50 kA, 50kV fast isolation and transfer switches, including testing of special water-cooled units capable of 50,000 amperes continuous duty. Similarly, detailed engineering data will be provided for the …
Date:
January 1, 1990
Creator:
Reass, W. A.; Cordova, R. J. & Garcia, J. G.
Object Type:
Article
System:
The UNT Digital Library