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in creator/contributor: "Russell, S."

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Measuring emittance using beam position monitors

The Los Alamos Advanced Free Electron Laser uses a high charge (greater than InC), low emittance (normalized rams emittance less than 5[pi] mm mrad) photoinjector driven accelerator. The high brightness achieved is due, in large part, to the rapid acceleration of the electrons to relativistic velocities. As a result, the beam does not have time to thermalize its distribution and its universe profile is, in general, non-Gaussian. This, coupled with the very high brightness, makes it difficult to… more

Date: January 1, 1993

Creator: Russell, S. & Carlsten, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measuring emittance using beam position monitors

The Los Alamos Advanced Free Electron Laser uses a high charge (greater than InC), low emittance (normalized rams emittance less than 5{pi} mm mrad) photoinjector driven accelerator. The high brightness achieved is due, in large part, to the rapid acceleration of the electrons to relativistic velocities. As a result, the beam does not have time to thermalize its distribution and its universe profile is, in general, non-Gaussian. This, coupled with the very high brightness, makes it difficult to… more

Date: June 1, 1993

Creator: Russell, S. & Carlsten, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

HIGH CURRENT L-BAND LINAC

The Sub-Picosecond Accelerator (SPA) at the Los Alamos National Laboratory is an L-band photoinjector. Using magnetic compression, the SPA routinely compresses 8 MeV, 1 nC per bunch electron beams from an initial temporal FWHM bunch length of 20 ps to less than 1 ps. In recent plasma wakefield accelerator experiments, we have compressed a 2 nC per bunch electron beam to an approximate temporal length of 1 ps.

Date: February 2001

Creator: Russell, S.; Carlsten, B. & Goettee, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States

Two tables are presented. The first is a comprehensive table of 157 young igneous systems in the western United States, giving locations, physical data, and thermal energy estimates, where appropriate for each system. The second table is a list of basaltic fields probably less than 10,000 years old in the western United States.

Date: January 1, 1978

Creator: Smith, R. L.; Shaw, H. R.; Leudke, R. G. & Russell, S. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Measuring the RMS length of short electron pulses with an rf cavity and a beam position monitor

The Sub-picosecond Accelerator at Los Alamos National Laboratory is a 1,300 MHz, 8 MeV photoinjector. Its beam can be bunched to sub-picosecond lengths using a magnetic chicane. To observe this, the author uses an rf cavity operating in a TM{sub 110} mode to generate a transverse magnetic dipole field that streaks each bunch as it passes. Inserting a screen downstream, he determines the pulse length by measuring the increase in the beam spot width. To achieve sufficient resolution two things mu… more

Date: August 1, 1997

Creator: Russell, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Preliminary results of RMS emittance measurements performed on the sub-picosecond accelerator using beam position monitors

The Sub-picosecond Accelerator at Los Alamos National Laboratory is a 1300 MHz, 8 MeV photoinjector. Concerned mainly with the exploration of bunched electron beams, the Sub-picosecond Accelerator facility is also used for a variety of other research. One ongoing task is the exploitation of the second moment properties of beam position monitor signals to measure the rms emittance. The unique properties of photoinjector beams make Gaussian assumptions about their distribution inaccurate and trad… more

Date: August 1, 1997

Creator: Russell, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Subpicosecond compression experiments at Los Alamos National Laboratory

The authors report on recent experiments using a magnetic chicane compressor at 8 MeV. Electron bunches at both low (0.1 nC) and high (1 nC) charges were compressed from 20 ps to less than 1 ps (FWHM). A transverse deflecting rf cavity was used to measure the bunch length at low charge; the bunch length at high charge was inferred from an induced energy spread of the beam. The longitudinal centrifugal-space charge force is calculated using a point-to-point numerical simulation and is shown not … more

Date: September 1, 1995

Creator: Carlsten, B.E.; Russell, S.J. & Kinross-Wright, J.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Coherent synchrotron radiation experiments for the LCLS

The authors describe a coherent synchrotron radiation experiment planned at Los Alamos to support the design of the Linac Coherent Light Source (LCLS) x-ray FEL. Preliminary simulations of the LCLS compressors show that a clever tuning strategy can be used to minimize the electron`s beam emittance growth due to noninertial space-charge forces by employing a delicate cancellation of these forces. The purpose of the Los Alamos experiment, using a sub-picosecond chicane compressor, is to benchmark… more

Date: December 31, 1998

Creator: Carlsten, B.E. & Russell, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Bayesian Treaty Monitoring: Preliminary Report

No Description Available.

Date: July 12, 2011

Creator: Russell, S. J.; Myers, S. C.; Arora, N. S.; Moore, D. A. & Sudderth, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experimental Investigation of Flutter of a Propeller With Clark Y Section Operating at Zero Forward Velocity at Positive and Negative Blade-Angle Settings

Report presenting an investigation of the flutter of a small one-blade wooden propeller with a Clark Y section. The highest flutter speeds were found in the vicinity of the angle of zero aerodynamic moment, with flutter speed increasing in this region with decreasing pressure.

Date: December 1949

Creator: Baker, John E. & Paulnock, Russell S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hovering and Low-Speed Performance and Control Characteristics of an Aerodynamic-Servocontrolled Helicopter Rotor System as Determined on the Langley Helicopter Tower

Report presenting an investigation to obtain basic performance and control characteristics of an aerodynamic-servocontrolled rotor system. Results regarding the hovering performance, low-speed flight performance, control effectiveness, transient response to collective pitch, and transient response to cyclic pitch are provided.

Date: May 1950

Creator: Carpenter, Paul J. & Paulnock, Russell S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hovering and Low-Speed Performance and Control Characteristics of the Kaman Helicopter Rotor System as Determined on the Langley Helicopter Tower. TED No. NACA DE 205

From Summary: "An investigation has been conducted with the Langley helicopter tower to obtain basic performance and control characteristics of the Raman rotor system. Blade-pitch control is obtained in this configuration by utilizing an auxiliary flap to twist the blades. Rotor thrust and power required were measured for the hovering condition and over a range of wind velocities from 0 to 30 miles per hour. The control characteristics and the transient response of the rotor to various control … more

Date: September 27, 1949

Creator: Carpenter, Paul J. & Paulnock, Russell S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Childhood Asthma and Smoking: Moderating Effect of Preterm Status and Birth Weight

Article exploring the association between second-hand smoke exposure, asthma, and asthma severity in children ages 6-17 as well as the effect of birth weight and prematurity (BWP) on parental smoking and asthma. Results indicate that focused asthma interventions in children should inquire about BWP status as well as parental smoking and household smoke exposure to reduce asthma morbidity and mortality.

Date: April 17, 2021

Creator: Ogbu, Chukwuemeka E.; Ogbu, Stella C.; Khadka, Dibya & Kirby, Russell S.

Item Type: Article

Partner: UNT College of Science

open access

INTOR Critical Issue D: Maintainability. Tritium Containment and Personnel Access vs Remote Maintenance, Chapter VI of the US INTOR Report for Phase Two A, Part 2

The purpose of this study is to compare the benefits and costs associated with personnel access mmaintenance procedures compared to those of all-remote maintenance procedures. The INTOR Phase Two A, Part I configuration was used to make this comparison. For both approaches, capital and operating costs were considered to first order, maintenance equipment requirements were investigated, maintenance requirements common to both approaches and unique to each were identified, tritium handling requir… more

Date: January 1, 1984

Creator: Spampinato, P. T.; Finn, P. A.; Gohar, Y.; Yang, S. T.; Stasko, R. R.; Morrison, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Preliminary Experimental and Analytical Evaluation of Diborane as a Ram-Jet Fuel

Report presenting an analytical and experimental evaluation of diborane as a ram-jet fuel, which seems to offer greater flight range, thrust, and combustion stability beyond what is attainable with petroleum fuels. Results regarding ideal thrust, stability, deposits, and flight range with several blends of diborane are provided.

Date: December 22, 1950

Creator: Gammon, Benson E.; Genco, Russell S. & Gerstein, Melvin

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Ion beam mixing of titanium overlayers with hydroxyapaptite substrates

The mixing of titanium overlayers with hydroxyapatite (HA) substrates via ion irradiation has been demonstrated. Analysis via secondary ion mass spectroscopy (SIMS) indicates an interfacial broadening of titanium and calcium of the implanted sample compared to that of the unimplanted sample. Attendant to the observed ion beam mixing of titanium into the HA, the oxygen signal of the titanium overlayer increases as a result of ion irradiation. It is supposed that this change is evident of diffusi… more

Date: January 1, 1995

Creator: Levine, T. E.; Nastasi, M.; Alford, T. L.; Suchicital, C.; Russell, S.; Luptak, K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comprehensive Assignment of Mass Spectral Signatures from Individual Bacillus atrophaeus Spores in Matrix-Free Bioaerosol Mass Spectrometry

We have conducted studies to fully characterize the mass spectral signature of individual Bacillus atrophaeus, previously known as Bacillus subtilis var niger or Bacillus globigii, spores obtained in matrix-free bioaerosol mass spectrometry (BAMS). Mass spectra of spores grown in unlabeled, {sup 13}C-labeled and {sup 15}N-labeled growth media are used to determine the number of carbon and nitrogen atoms associated with each mass peak. To determine the parent ion structure associated with fragme… more

Date: October 22, 2004

Creator: Srivastava, A; Pitesky, M; Steele, P; Tobias, H; Fergenson, D P; Horn, J et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

F-3 and F-4 Engine Tests of Several High-Antiknock Components of Aviation Fuel

Report discussing testing on triptane, hot-acid octane, diisopropyl, neohexane, mixed xylenes, cumene, benzene, toluene, and methyl tert-butyl ether in several blends to determine their knock-limited performance data in F-3 and F-4 engines at standard operating conditions. All of the blending agents examined were found to be usable, with concentrations varying depending on various thermodynamic properties.

Date: November 27, 1944

Creator: Imming, Harry S.; Barnett, Henry C. & Genco, Russell S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Knock-Limited Blending Characteristics of Blends of Triptane and 28-R Aviation Fuel

"F-3 and F-4 knock data are presented for blends of 0, 20, 40, 60, and 80 percent by volume of triptane in 28-R reference fuel plus approximately 4.6 ml TEL per gallon in the final blends. For comparison of knock-limited performance, 28-R reference fuel containing 2.7 percent by volume of xylidines and leaded to 6 ml TEL per gallon is included. In order to provide information on temperature sensitivities, two sets of modified conditions were used in addition to the standard F-4 engine condition… more

Date: April 1944

Creator: Evvard, John C.; Imming, Harry S. & Genco, Russell S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Chinguetti - Terrestrial Age and Pre-Atmospheric Size

Chinguetti is a 4.5 kg mesosiderite find recovered from the Adra region of Mauretania. In this paper the authors analyse a portion of the recovered sample for cosmogenic radionuclides to determine its terrestrial age, and to determine its pre-atmospheric radius. They determined the terrestrial age of Chinguetti to be < 30 ky. They constrain the pre-atmospheric radius to 50--80 cm and the shielding depths of 15--25 cm. These data indicate that Chinguetti is a comparatively recent fall.

Date: January 14, 2000

Creator: Welten, K. C.; Masarik, J.; Bland, P. A.; Caffee, M. W.; Russell, S. S.; Grady, M. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

1981-2010 U. S. Hourly Normals

This is the hourly normals meteorological data.

Date: 2012

Creator: Applequest, Scott; Arguez, Anthoney; Durre, Imke; Squares, Michael F. & Yin, Xungang

Item Type: Text

Partner: UNT Libraries Government Documents Department

open access

Investigation of Inhibitory Influences in Neuronal Monolayer Networks Cultured from Mouse Spinal Cord

The effects of the inhibitory neurotransmitters gammaamino butyric acid (GABA) and glycine were characterized on spontaneous activity recorded from mouse spinal cord cultures. The GABA concentration which completely inhibited burst activity was chosen as a quantifiable measure of culture drug response and was used to 1) assess interculture and intraculture variability, 2) determine the influence of culture age and initial activity on GABA responses, and 3) compare the GABA responses between net… more

Date: August 1992

Creator: Jordan, Russell S. (Russell Stall)

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Operation of the high brightness linac for the advanced free-electron laser initiative at Los Alamos

Free-electron lasers and high energy physics accelerators have increased the demand for very high-brightness beam sources. This paper describes the design of an accelerator which has produce beams of less than 2.1 [pi] mm-mrad at 1 nC and emittances of 3.7 and 6.5 [pi] mm-mrad for 2 and 3 nC, respectively. The accelerator has been operated between 10 and 18 MeV.The beam emittance growth in the accelerator is minimized by using a photoinjector electron source integrated into the design of the li… more

Date: January 1, 1993

Creator: Sheffield, R. L.; Austin, R. H.; Chan, K. C. D.; Gierman, S. M.; Kinross-Wright, J. M.; Kong, S. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operation of the high brightness linac for the advanced free-electron laser initiative at Los Alamos

Free-electron lasers and high energy physics accelerators have increased the demand for very high-brightness beam sources. This paper describes the design of an accelerator which has produce beams of less than 2.1 {pi} mm-mrad at 1 nC and emittances of 3.7 and 6.5 {pi} mm-mrad for 2 and 3 nC, respectively. The accelerator has been operated between 10 and 18 MeV.The beam emittance growth in the accelerator is minimized by using a photoinjector electron source integrated into the design of the li… more

Date: June 1, 1993

Creator: Sheffield, R. L.; Austin, R. H.; Chan, K. C. D.; Gierman, S. M.; Kinross-Wright, J. M.; Kong, S. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department