WorldCat Identities

Collins, Carl B.

Overview
Works: 20 works in 66 publications in 1 language and 92 library holdings
Genres: Conference papers and proceedings 
Roles: Editor, Author
Classifications: TA1673,
Publication Timeline
.
Most widely held works by Carl B Collins
Proof of the Feasibility of Coherent and Incoherent Schemes for Pumping a Gamma-Ray Laser by C. B Collins( Book )

17 editions published between 1987 and 1993 in English and held by 18 WorldCat member libraries worldwide

Recent approaches to the problem of the gamma-ray laser have focused upon upconversion techniques in which metastable nuclei are pumped with long wavelength radiation. At the nuclear level the storage of energy can approach tera-joules. 10 to the 12th power J per liter for thousands of years. However, any plan to use such a resource for a gamma-ray laser poses problems of a broad interdisciplinary nature requiring the fusion of concepts taken from relatively unrelated fields of physics. Our research group has described several means through which this energy might be coupled to the radiation fields with cross sections for stimulated emission that could reach 10 to the -17th power sq. cm. Such a stimulated release could lead to output powers as great as 3 x 10 to the 21st power Watts/liter. Since 1978 we have pursued an approach for the upconversion of longer wavelength radiation incident upon isomeric nuclear populations that can avoid many of the difficulties encountered with traditional concepts of single photon pumping. Recent experiments have confirmed the general feasibility and have indicated that a gamma-ray laser is feasible if the right combination of energy levels and branching ratios exists in some real material. Of the 1986 distinguishable nuclear materials, the present state-of-the-art has been adequate to identify 29 first-class candidates, but further evaluation cannot proceed without remeasurements of nuclear properties with higher precision
Proceedings of the International Conference on Lasers '80 : New Orleans, Louisiana, December 15-19, 1980 by International Conference on Lasers( Book )

4 editions published in 1981 in English and held by 18 WorldCat member libraries worldwide

Proceedings of the International Conference on Lasers '81, New Orleans, Louisiana, December 14-18, 1981 by International Conference on Lasers( Book )

3 editions published in 1981 in English and held by 12 WorldCat member libraries worldwide

Gamma-ray lasers : proceedings of the 1st international gamma-ray laser workshop (GARALAS'95), Predeal, Romania, 19-23 August 1995 by 1995, Predeal> GARALAS. <1( Book )

6 editions published in 1997 in English and held by 8 WorldCat member libraries worldwide

The Demonstration of the Feasibility of the Tuning and Stimulation of Nuclear Radiation( Book )

7 editions published between 1985 and 1991 in English and held by 7 WorldCat member libraries worldwide

This project concerns the demonstration of the feasibility of the tuning and perhaps even stimulation of nuclear radiation. Theory has indicated that anti-Stokes Raman upconversion of intense but conventional long wavelength sources of radiation produced by scattering from isomeric states of nuclear excitation could lead to significant sources of tunable gamma-radiation characterized by the natural Mossbauer widths of the lines. This would result in lines with sub-Angstrom wavelengths and widths of a few MHz. Whether or not these processes can reach threshold depends upon the resolution of basic issues lying in a interdisciplinary region between quantum electronics and nuclear physics that have not been previously addressed. It was the purpose of this work to study these issues experimentally. The overall problem being addressed is a broad one that naturally divides into three lines: (1) Coupling pump power into a nucleus, (2) Extracting nuclear excitation with a radiation field, and (3) Insuring material survival. Such a perspective is beyond the scope of a single project and only the second line has been addressed by the work supported by this grant. (rh)
The Nitrogen Ion Laser( Book )

6 editions published between 1974 and 1977 in English and held by 6 WorldCat member libraries worldwide

The characterization and thermal scaling of the nitrogen ion laser pumped by charge transfer from He(3+) is reported in this work. Intense laser emission in the violet at 427 nm has been observed and found to have a linewidth less than 0.3 A. The pumping ions, He(2+) and He(3+), were produced by discharge of a fast-pulsed electron beam gun, APEX-1, into several atmospheres of a mixture of helium and nitrogen. Excitation current densities ranged from 1.1 to 2.5 KA/sq cm at 1 MV over a 1 x 10 cm transverse geometry. Under these conditions, the efficiency of the emission of 427 nm laser radiation was found to be proportional to the total pressure raised to the 1.2 power. Efficiencies of 1.6 relative to the energy lost by the electron beam in the radiating volume have been achieved in volumes of 16 cc at room temperature. Outputs of 35 mJ have been obtained from the 16 cc working volume at 30 atm pressure under these conditions. Thermal scaling of the laser has been investigated and a strong inverse dependence of laser output on gas temperature was observed
Investigation of the Feasibility of the Electron Beam-Excited, High-Pressure Recombination Laser( Book )

5 editions published between 1972 and 1974 in English and held by 5 WorldCat member libraries worldwide

The report describes research applied toward the determination of the feasibility of developing a recombining, electron beam-excited plasma into a pulsed laser of exceptionally high peak power. The indication of small signal gain for optical amplification at 5875 A is the principal subject of this supplement. (Author)
Renewal of Research on Triggering Nuclear Spin Isomers( Book )

2 editions published in 2005 in English and held by 2 WorldCat member libraries worldwide

Nuclear spin isomers store electromagnetic energy at densities reaching 1.3 GJ/g for shelf lives approaching centuries. The best combination of shelf life and energy storage is found in Hf-178. It has been shown to release its stored energy when triggered by x-ray flashes at modest power levels. In this work trigger pulses were derived from tunable, monochromatic x-rays produced by synchrotron radiation sources. It was proven that the triggering was initiated by photoionization of an electron from the L-shell surrounding the isomeric nucleus. A fraction of 0.16% of those photoionizing events led to triggering of the release of the energy stored by the Hf-178 nuclear spin isomer. Confidence in these positive experimental results reached 92 sigma which is equivalent to 1,824 nines of certainty
Use of L and M Shell Electrons to Trigger Nuclear Spin Isomers( Book )

2 editions published in 2007 in English and held by 2 WorldCat member libraries worldwide

Populations of nuclear spin isomers of 178Hfm2 can be triggered to release their stored energies by the absorption of x-rays having energies in the range 9-13 keV. We have found the basic absorption spectrum for triggering to be approximately 0.16% of the cross section for photoionization of the L-shell electrons surrounding the isomeric nuclei. The maximum effect is induced by X-rays with energies exceeding the threshold for the photoionization of L3 electrons by amounts less than 10 eV. Absorption of a photon of that energy, around 9567 eV triggers the release of 2.446 MeV, thus producing a gain of radiative energy of 256 times for each event. Confidence in the observations of such triggering is better than 10 followed by 1823 zeros to 1
Low-Impedance Compact Modulators Capable of Generating Intense Ultra-fast Rising Nanosecond Waveforms( Book )

2 editions published in 2006 in English and held by 2 WorldCat member libraries worldwide

In this work, efforts were concentrated upon exploration and examinations of the impedance parameter space and output pulse characteristics of the Blumlein devices to facilitate development of reliable pulsers capable of generating intense ultra wideband electric fields. Output pulse characteristics available from our Blumlein pulsers with different number of lines, line impedances and switching devices were examined. The range of pulse characteristics that may be of interest for Bioelectric and Isomer Research applications were recorded. Issues concerning the switch longevity were studied by fabrication and testing the GaAs photoconductive switches treated with the amorphic diamond. Longevity tests were performed and results for the switch lifetime demonstrated a significant improvement with the application of amorphic diamond. In addition, we studied and surveyed various methods and geometries for non-intrusive electric field delivery and flash x-ray production. Low impedance x-ray diodes were designed and implemented. Output waveforms and x-ray generation were examined by the proper matching of diodes to Blumlein pulsers commutated by thyratrons and/or photoconductive switches. Ultra-fast rising x-ray pulses were produced and studied
Progress in the Production of Samples of Gamma Ray Laser Candidate Materials( )

2 editions published between 1995 and 1996 in English and held by 2 WorldCat member libraries worldwide

Studies of the 29 possible candidates to use as the working medium of a gamma ray laser have identified the 31-year isomer of Hafnium-178 as the best. This research is aimed at the development of a production cycle for this rare substance. A major success of this year's work has been the discovery in byproduct debris from the synthesis of medical isotopes of a quantity of this material equal to 99% of the world's inventory. Chemical conditioning and recovery of this sample have been initiated. Also, an evaluation was made of the 142 reactions with potential for restocking the existing inventories. (AN)
The Gamma-Ray Laser Project( Book )

2 editions published between 1987 and 1989 in English and held by 2 WorldCat member libraries worldwide

Recent approaches to the problem of the gamma-ray laser have focused upon upconversion techniques in which metastable nuclei are pumped with long wavelength radiation. At the nuclear level the storage of energy can approach tera-Joules (10 to the 12tj power J) per liter for thousands of years. However, any plan to use such a resource for a gamma-ray laser poses problems of a broad interdisciplinary nature requiring the fusion of concepts taken from relatively unrelated fields of physics
Proceedings by International Conference on Lasers '80( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

Charge Transfer Pumping of the Helium Nitrogen Laser at Atmospheric Pressures in an Electrical Avalanche Discharge( Book )

1 edition published in 1977 in English and held by 1 WorldCat member library worldwide

An Atmospheric Electrical Avalanche (AEA) laser, stabilized by displacement current preionization, has been developed to support the study of the collisional pumping of the N2(+), B yields X, electronic transition by the kinetic step He2(+) + N2 + He yields N2+(B 2 Sigma sub u) + 3He. With proper preionization, the AEA laser has been operated at a PRF of 1 to 30 Hz in an avalanche mode at 100 to 200 A/sq. cm. and E/p of 5 v/cm/torr. At pressures from 1 to 8 atm an essentially uniform, 30 cu. cm. volume containing a high concentration of He2(+) has been produced. Resulting laser output pumped by the charge transfer reaction has exceeded 1MW peak power at 427.8 nm. in a 4 nsec pulse. Efficiency with respect to the electrical power flowing through the laser tube has exceeded 2% and output pulse energies have exceeded 1% of the input pulse of energy dissipated in the laser tube. (Author)
The Demonstration of the Feasibility of the Tuning and Stimulation of Nuclear Radiation. Gamma Ray Laser( Book )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

This project concerns the demonstration of the feasibility of the tuning and perhaps even stimulation of nuclear radiation. Theory has indicated that anti-Stokes Raman upconversion of intense but conventional long wavelength sources of radiation produced by scattering from isomeric states of nuclear excitation could lead to significant sources of tunable gamma radiation characterized by the natural Mossbauer widths of the lines. This would result in lines with sub-Angstrom wavelengths and widths of a few MHz. Whether or not these processes can reach threshold depends upon the resolution of basic issues lying in an interdisciplinary region between quantum electronics and nuclear physics that have not been previously addressed. It was the purpose of this work to study these issues experimentally. Our proposal has been that the key to the excitation of significant levels of multiphoton phenomena lay in the use of small oscillating fields to manipulate the greater ferromagnetic and ferroelectric fields in which nuclei were immersed. Unfortunately, such materials are almost always magnetostrictive or piezoelectric and concern had lingered that all coherent phenomena would be overwhelmed and degraded by periodic Doppler shifts produced by vibrations excited by such mechanical efforts. In the past year we completed an experiment in which we dressed nuclear states with photons from the periodic oscillation of magnetization transported by spin waves through a medium unable to propagate vibrations. Large effects were found to confirm our models
Activities of the International Laser Science Conference (1st) Held on 18-22 November, 1985 at Dallas, Texas( Book )

1 edition published in 1986 in English and held by 1 WorldCat member library worldwide

Because of the high standards imposed by the Organizing and Program Committees upon the acceptance of papers, this conference provided an optimal format for the dissemination of results in laser science among workers in the field, many of whom are Army Contractors. A compact and profound perception was presented of the state of the art which lies at the nucleus of many applications that are also on interest to the Army. Moreover, participation enable Contractors to obtain a professional critique of their own efforts as they became more aware of the field in which they work
Expansion of Research on the Tuning and Stimulation of Nuclear Radiation( Book )

1 edition published in 1986 in English and held by 1 WorldCat member library worldwide

This contract supported a critical phase of an ongoing project having the objective of determining the feasibility and means of realizing a gamma-ray laser. Previous work had served to establish that a gamma-ray laser is feasible if a certain combination of elementary properties can be found in a real nuclear material. Traditional technology could not support the evaluation of these laser-like properties of nuclei and new methodologies had to be developed. Described here are highly significant successes in the development and demonstration of prototypes of two new devices need for the screening of candidate laser materials in a realistic time frame, a flash x-ray device for pumping test materials and a Nuclear Raman Spectrometer to facilitate the search for certain arrangements of nuclear energy levels. Keywords include: Extreme Ultraviolet, Tunable XUV, and Gamma ray laser
Gaseous Electronics Conference (35th) Held at Dallas, Texas, 19-22 October 1982( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

This Conference is sponsored each year by the Division of Electron and Atomic Physics of the American Physical Society, and was hosted this year by UTD. One hundred forty-four papers were presented in 19 sessions. Two workshops were held, one devoted to Atomic and Molecular Collisions Processes in Dense Plasmas and the other to Chemical Processes in Planetary Atmospheres
The Gamma-Ray Laser Project: Proof of the Feasibility of Coherent and Incoherent Schemes for Pumping a Gamma-Ray Laser( Book )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

Recent approaches to the problem of the gamma-ray laser have focused upon upconversion techniques in which metastable nuclei are pumped with long wavelength radiation. At the nuclear level the storage of energy can approach tera-Joules (10 to the 12th power J) per liter for thousands of years. However, any plan to use such a resource for a gamma-ray laser poses problems of a broad interdisciplinary nature requiring the fusion of concepts taken from relatively unrelated fields of physics. Since 1978 we have pursued an approach for the upconversion of longer wavelength radiation incident upon isomeric nuclear populations that can avoid many of the difficulties encountered with traditional concepts of single photon pumping. Recent experiments have confirmed the general feasibility and have indicated that a gamma-ray laser is feasible if the right combination of energy levels and branching ratios exists in some real material. Resolution of the question of the feasibility of a gamma-ray laser now rests upon the determination of: 1) the identity of the best candidate, 2) the threshold level of laser output, and 3) the upconversion driver for that material
Blue-Green Laser Output from N(+2) and XeF( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

The objective of this work was to determine the feasibility of developing, first the helium nitrogen charge transfer laser, and later the XeF laser into efficient scalable devices excited by preionized discharges for the production of blue-green outputs. The performance and scalability of the N2(+) laser pumped by charge transfer from He2(+) was determined in such a discharge environment. The gain and saturation parameters were measured and a regenerative amplifier capable of operation at 470.9 nm was constructed. A traveling wave device was built which at 427 nm produced peak powers of 5 MW in the forward direction and which had a front-to-back ratio of 10,000 to 1 for the pulse energies. Efforts were made to apply that technology to the problem of switching the output from a XeF laser into the C yields A transition at 480 nm. Gain and saturation parameters were examined and it was found that the relative gains between the stronger UV transition and the blue-green transition were greater than 30 to 1. These results implied that the blue-green transition of XeF was too weak to support the development of any practical device pumped by a preionized discharge. (Author)
 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.89 (from 0.73 for Proceeding ... to 0.99 for The Demons ...)

Associated Subjects
Languages
English (66)