Organization:
Physics (PH)

Description

The mission of the Physics Department is to provide defense-relevant, advanced education and research programs to meet Naval unique needs, and increase the warfighting effectiveness of the U.S. Naval Forces, DoD and allied armed forces.

Website of the organization

https://nps.edu/web/physics

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Publication Search Results

Now showing 1 - 10 of 63

Evaluation process for chemical/biological/radiological hazard assessment models
(Monterey, California. Naval Postgraduate School, 1996-08) Schacher, G. E. (Gordon Everett); Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Research and Sponsored Programs Office (RSPO); Physics
Summary of Research 1997
(Monterey, California, Naval Postgraduate School, 1997) Maier, William B.; Cleary, David D.; Physics (PH); Graduate School of Engineering and Applied Science (GSEAS); Department of Physics
This report contains summaries of research projects in the Department of Physics. A list of recent publications in also included which consists of conference presentations and publications, books, contributions to books, published jounal papers, technical reports, and thesis abstracts.
Primes: The first two thousand four hundred prime numbers
(Monterey, California. Naval Postgraduate School, 1990-12) Kinney, Gilbert Ford; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Research and Sponsored Programs Office (RSPO); Physics
These simple and mathematically elegant but practically useless prime number listings could have an appeal for afficionados of elementary number theory. They were prepared using a computer adaptation of the Sieve of Aratosthenes of Alexandria and the computations made on a small personal computer with an 8-bit microprocessor, a 64K random access memory, and a 2- megahertz clock. Computing time for checking 21, 380 integers and identifying the included 2400 prime numbers was about thirty minutes. This computational effort is quite modest compared to others such as two which are reported to have examined the first ten million integers. But the mere 2400 primes reported here, plus related items such as the number of prime twins and the integer gap between successive primes, are presented in tangible form
Professor John Dyer Memorial Lecture : the origin of the universe from quantum chaos, an introduction to current ideas
(Monterey, California. Naval Postgraduate School, 1989-05) Woehler, Karlheinz E.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
In his recently published book 'A Brief History of Time', S. Hawking describes his remarkable insights into the problem of the origin of our universe. In this talk a more quantitative description of some of the important principles from this book is presented as a mathematical appendix to it. A brief review of the ideas of the Standard Big Bang Model of the Universe is given in terms of the evolution equation that follows from Einstein's theory. The meaning of the Cosmological Constant, its relation to Vacuum Energy, the model of the empty DeSitter Space and Gravity is derived. By analogy to Schrodinger mechanics one can give the general features of Quantum Cosmology', in which the origin of the universe can be viewed as a Quantum tunneling process in imaginary time from a Quantum Chaos state of no space, no time, no matter to an inflationary expanding DeSitter space which eventually transits into the Hot Big Bang Expansion that we see
Investigation of the Effect of Convergent Detonation on Metal Acceleration and Gurney.
(2012-06) Ludwig, Wibke; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
There are longstanding interests in the analysis of explosive effects and applications in order to derive properties and predict an explosive’s behavior. This work makes a contribution to the research field of metal acceleration by the means of detonations. The effects of both planar and convergent detonation fronts on metal acceleration are investigated with respect to the Gurney model. The derived characteristic velocity, the so-called Gurney constant, is material specific and characterizes the ability of metal acceleration for a certain explosive. The hydrocode program ANSYS AUTODYN is used to calculate and analyze the simulations of this work. The focus is set on cylinder expansion tests with respect to parametric variations. In addition, cylindrical coaxial charges are explored in order to compare the different methods of realizing a convergent detonation front. Experimental and simulated results are compared, discussed and evaluated.
Internal explosions of reactive aluminum with a PBX in air
(Monterey, California. Naval Postgraduate School, 1983-08) Reinhardt, Richard Alan; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Dept. of Physics
Computations were performed for pressure, temperature and equilibrium product yield in the internal explosions of 208.5 lbs of reactive aluminum with 52.1 lbs of a PBX in air for air volumes ranging from 2000 to 50000 cubic feet. The decrease in overpressure with increasing volume is interrupted by a temporary rise in the region where the solid present changes from A1N to A1
Free Electron Laser material damage studies
(Monterey, California. Naval Postgraduate School, 2000-11) McGinnis, Roger D.; Thomson, R. W.; Short, L. R.; Herbert, A.; Lampiris, D.; Christodoulou, A.; Colson, W. B.; Shinn, M. D.; Neil, G.; Benson, S.; Gubeli, J.; Evans, R.; Jordan, K.; Physics (PH); Thomas Jefferson National Accelerator Facility; Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Institute for Joint Warfare Analysis
Today's surface ships are faced with an increased vulnerability to anti-ship cruise missiles, due to a change from operating in open oceans to primarily operating in the world's littorals. One possible solution to counter this threat is the use of a high-energy laser to destroy the missiles in flight. The Free Electron Laser is possibly the best choice of lasers for a marine environment since its wavelength can be changed over a wide range allowing the operator to choose the best wavelength to transmit through the atmosphere. Material damage studies on various anti-ship cruise missile materials were carried out at Thomas Jefferson National Accelerator Facility (TJNAF) in Newport News, Virginia. Experimental procedures presented in this report allow a scaled down laser of a few hundred to a few thousand watts to evaluate the damage from a weapon size laser of the megawatt class. The EEL beam bombards the target with a steady stream of picosecond length pulses at rates of 18MHz or greater. No other experiments have previously been done to explore the effects of the EEL pulse on materials. This report contains the work of several theses conducted at the Naval Postgraduate School over the past two years, and has been a productive cooperation among NPS, TJNAF, NRL, and NSWD at Port Hueneme, to the benefit of the Department of Defense.
UMD/NPS free electron laser research
(Monterey, California. Naval Postgraduate School, 2008) Colson, William B.; Blau, Joseph; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); University of Maryland
Simulations and theoretical analysis are used to study the development of high-average-power free electron lasers (FELs). Various existing and proposed FELs are studied, in both amplifier and oscillator configurations. Comparisons to experimental results show good agreement in each case. At the outset of this project, short Rayleigh length (SRL) optical cavities were proposed to reduce the optical intensity on the mirrors. Contrary to conventional wisdom, our simulations showed that an SRL FEL would have good gain and power extraction. This was recently confirmed experimentally at Jefferson Laboratory. System sensitivity to misalignments and distortions are also studied, and tolerance limits are established for tilts and shift of various components such as the mirrors, electron beam, and magnetic quadrupoles. These tolerances have already been readily achieved in laboratories using active alignment. The research done over 8 years on this project has resulted in 19 published papers, 21 M.S. theses, 2 Ph.D. dissertations, and 26 conference presentations, which are summarized in this report.
A short take-off/vertical landing (STOVL) aircraft carrier (S-CVX)
(Monterey, California. Naval Postgraduate School, 1998-05-01) Calvano, Charles Natale; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Mechanical Engineering
This report documents a systems engineering and design capstone project, directed by the Total Ship Systems Engineering (TSSE) faculty and undertaken by students in the TSSE program at the Naval Postgraduate School and performed over two academic quarters. It takes a fresh look at the basic design and operation of the modem aircraft carrier, assuming availability of short take-off and vertical landing (STOVL) aircraft, employing gas turbine ship propulsion and providing significant capability to support humanitarian operations. In the design study reported here, the authors take a systems engineering approach to a totally new carrier design which may best suit the requirements for the next generation aircraft carrier. The central goal was to provide a ship to meet all of the current mission requirements of the existing Nimitz class carriers but in a platform that is significantly lower in life cycle costs. The outcome is a ship based on a concept called "super-island"; a large island structure that can provides drive-through "pit- stops" for aircraft refueling and rearming as well as other major functions. Other areas of major innovation include: weapons handling, information processing and distribution, engineering layout and manning. The report provides an overview of the major ship systems as well as detailed discussions of selected design areas chosen to illustrate those systems that had the most impact on meeting design goals.
A New Methodology for Assessing the Military Value of Tactical Intelligence and Surveillance Systems
(Monterey, CA; Naval Postgraduate School, 1995-05) Sternberg, Joseph; Thackeray, Ross; Johnson, Frederick; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Physics
The objective of this program is to develop and apply a methodology for assessing the impact of indications and warning (I&W) information, derived from external sources, on the mission success of a naval carrier battle group CVBG). This would provide the basis for assessing the operational importance of the performance characteristics (timeliness, frequency of coverage, quality of information, etc.) of current or proposed information systems and to evaluate the consequences of enemy interference or deception. The need to account for operational decisions based on conflicting and incomplete information has led to the development of a unique wargame as a key element of the methodology.