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Initiation of long, free-standing Z-discharges by CO2 laser gas heating
High current discharge channels can neutralize both current and space charge of very intense ion beams. Therefore they are considered as an interesting alternative for the final focus and beam transport in a heavy ion beam fusion reactor. At the GSI accelerator facility, 50 cm long, stable, free-standing discharge channels with currents in excess of 40 kA in 2 to 25 mbar ammonia (NH{sub 3}) gas are investigated for heavy ion beam transport studies. The discharges are initiated by a CO{sub 2} laser pulse along the channel axis before the discharge is triggered. Resonant absorption of the laser, tuned to the {nu}{sub 2} vibration of the ammonia molecule, causes strong gas heating. Subsequent expansion and rarefaction of the gas prepare the conditions for a stable discharge to fulfill the requirements for ion beam transport. This paper describes the laser-gas interaction and the discharge initiation mechanism. We report on the channel stability and evolution, measured by fast shutter and streak imaging techniques. The rarefaction of the laser heated gas is studied by means of a hydrocode simulation.
Date:
April 19, 2004
Creator:
Nieman, C.; Tauschwitz, A.; Penache, D.; Neff, S.; Knobloch, R.; Birkner, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Rapidity and species dependence of particle production at largetransverse momentum for d+Au collisions at psNN = 200 GeV
We determine rapidity asymmetry in the production of charged pions, protons and anti-protons for large transverse momentum (p{sub T}) for d+Au collisions at {radical}s{sub NN} = 200 GeV. The rapidity asymmetry is defined as the ratio of particle yields at backward rapidity (Au beam direction or -ve rapidity) to those at forward rapidity (d beam direction or +ve rapidity). The identified hadrons are measured in the rapidity regions |y| < 0.5 and 0.5 < |y| < 1.0 for the p{sub T} range 2.5 < p{sub T} < 10 GeV/c. We observe significant rapidity asymmetry for charged pion and proton+anti-proton production in both rapidity regions. The asymmetry is larger for 0.5 < |y| < 1.0 than for |y| < 0.5 and is almost independent of particle type. The measurements are compared to various model predictions employing multiple scattering, energy loss, nuclear shadowing, saturation effects, and recombination, and also to a phenomenological parton model. We find that asymmetries are sensitive to model parameters and show model-preference. The rapidity dependence of {pi}{sup -}/{pi}{sup +} and {bar p}/p ratios in peripheral d+Au and forward neutron-tagged events are used to study the contributions of valence quarks and gluons to particle production at high p{sub T}. …
Date:
December 19, 2006
Creator:
Abelev, B. I.; Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Report
System:
The UNT Digital Library
Three-pion Hanbury-Brown-Twiss correlations in relativistic heavy-ion collisions from the STAR experiment
Data from the first physics run at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory, Au+Au collisions at {radical}s{sub NN} = 130 GeV, have been analyzed by the STAR Collaboration using three-pion correlations with charged pions to study whether pions are emitted independently at freezeout. We have made a high-statistics measurement of the three-pion correlation function and calculated the normalized three-particle correlator to obtain a quantitative measurement of the degree of chaoticity of the pion source. It is found that the degree of chaoticity seems to increase with increasing particle multiplicity.
Date:
June 19, 2003
Creator:
Adams, J.; Adler, C.; Ahammed, Z.; Allgower, C.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
The Ranger (San Antonio, Tex.), Vol. 68, No. 17, Ed. 1 Friday, February 19, 1993
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
February 19, 1993
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 3, No. 786, Ed. 1 Wednesday, September 19, 1906
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
September 19, 1906
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner-Press (Brenham, Tex.), Vol. 40, No. 71, Ed. 1 Tuesday, June 19, 1923
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
June 19, 1923
Creator:
Robertson, Ruby
Object Type:
Newspaper
System:
The Portal to Texas History
Mt. Pleasant Daily Times (Mount Pleasant, Tex.), Vol. 21, No. 57, Ed. 1 Friday, May 19, 1939
Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
May 19, 1939
Creator:
Cross, G. W.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner-Press (Brenham, Tex.), Vol. 31, No. 250, Ed. 1 Tuesday, January 19, 1915
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
January 19, 1915
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Seguiner Zeitung. (Seguin, Tex.), Vol. 19, No. 40, Ed. 1 Thursday, May 19, 1910
Weekly German-language newspaper from Seguin, Texas that includes local, state and national news along with advertising.
Date:
May 19, 1910
Creator:
Gofemann, H. G. B.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 169, Ed. 1 Friday, July 19, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 19, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
The La Grange Journal (La Grange, Tex.), Vol. 70, No. 20, Ed. 1 Thursday, May 19, 1949
Weekly newspaper from La Grange, Texas that includes local, state, and national news along with extensive advertising.
Date:
May 19, 1949
Creator:
Priebe, Charles W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Fayette County Record (La Grange, Tex.), Vol. 43, No. 101, Ed. 1 Tuesday, October 19, 1965
Semi-weekly newspaper from La Grange, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 19, 1965
Creator:
Priebe, Charles W.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner-Press (Brenham, Tex.), Vol. 39, No. 20, Ed. 1 Wednesday, April 19, 1922
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
April 19, 1922
Creator:
Robertson, Ruby
Object Type:
Newspaper
System:
The Portal to Texas History
The Humble Echo (Humble, Tex.), Vol. 1, No. 36, Ed. 1 Friday, February 19, 1943
Weekly newspaper from Humble, Texas that includes local, state, and national news along with advertising.
Date:
February 19, 1943
Creator:
Beaumont, E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 6, No. 1741, Ed. 1 Tuesday, October 19, 1909
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
October 19, 1909
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
Centroid and Envelope Eynamics of Charged Particle Beams in an Oscillating Wobbler and External Focusing Lattice for Heavy Ion Fusion Applications
Recent heavy ion fusion target studies show that it is possible to achieve ignition with direct drive and energy gain larger than 100 at 1MJ. To realize these advanced, high-gain schemes based on direct drive, it is necessary to develop a reliable beam smoothing technique to mitigate instabilities and facilitate uniform deposition on the target. The dynamics of the beam centroid can be explored as a possible beam smoothing technique to achieve a uniform illumination over a suitably chosen region of the target. The basic idea of this technique is to induce an oscillatory motion of the centroid for each transverse slice of the beam in such a way that the centroids of different slices strike different locations on the target. The centroid dynamics is controlled by a set of biased electrical plates called 'wobblers'. Using a model based on moments of the Vlasov-Maxwell equations, we show that the wobbler deflection force acts only on the centroid motion, and that the envelope dynamics are independent of the wobbler fields. If the conducting wall is far away from the beam, then the envelope dynamics and centroid dynamics are completely decoupled. This is a preferred situation for the beam wobbling technique, because …
Date:
July 19, 2011
Creator:
Logan, Ronald C. Davidson and B. Grant
Object Type:
Report
System:
The UNT Digital Library
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 6, No. 1586, Ed. 1 Monday, April 19, 1909
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
April 19, 1909
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Leader. (Lampasas, Tex.), Vol. 19, No. 22, Ed. 1 Friday, April 19, 1907
Weekly newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
April 19, 1907
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Banner-Press (Brenham, Tex.), Vol. 50, No. 73, Ed. 1 Monday, June 19, 1933
Daily newspaper from Brenham, Texas that includes local, state, and national news along with extensive advertising.
Date:
June 19, 1933
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 9, No. 314, Ed. 1 Friday, December 19, 1884
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
December 19, 1884
Creator:
Rankin, John G. & Levin
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News. (Albany, Tex.), Vol. 20, No. 38, Ed. 1 Friday, February 19, 1904
Weekly newspaper from Albany, Texas that includes local, state and national news along with advertising.
Date:
February 19, 1904
Creator:
McCarty, Richard H.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Leader. (Lampasas, Tex.), Vol. 17, No. 23, Ed. 1 Friday, May 19, 1905
Weekly newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
May 19, 1905
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
Mt. Pleasant Daily Times (Mount Pleasant, Tex.), Vol. 14, No. 82, Ed. 1 Monday, June 19, 1933
Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
June 19, 1933
Creator:
Cross, G. W.
Object Type:
Newspaper
System:
The Portal to Texas History
Mt. Pleasant Daily Times (Mount Pleasant, Tex.), Vol. 16, No. 93, Ed. 1 Wednesday, June 19, 1935
Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
June 19, 1935
Creator:
Cross, G. W.
Object Type:
Newspaper
System:
The Portal to Texas History