TY - RPRT TI - Plasma-Material Interaction Under Simulated Combustion Environment in Electrothermal-Chemical Launchers AU - Bourham, M.A. AU - Gilligan, J.G. A3 - The US Army Armament, Munitions and Chemical Command, Watervliet Arsenal, Benét Weapons Laboratory DA - 1994/5// PY - 1994/5// M3 - Final Technical Report PB - The US Army Armament, Munitions and Chemical Command, Watervliet Arsenal, Benét Weapons Laboratory ER - TY - RPRT TI - Plasma-Material Interactions Relevant to Electrothermal-Chemical Launchers Under Realistic Operational Conditions AU - Bourham, M.A. AU - Gilligan, J.G. A3 - The US Army Armament, Munitions and Chemical Command, Watervliet Arsenal, Benét Weapons Laboratory DA - 1994/5// PY - 1994/5// M3 - Final Technical Report PB - The US Army Armament, Munitions and Chemical Command, Watervliet Arsenal, Benét Weapons Laboratory ER - TY - CONF TI - Performance of Bore Protective Materials Under a Combustion Environment in a Plasma-Propellant Interaction Experiment AU - Bourham, M.A. AU - Gilligan, J.G. AU - Nahm, M.L. T2 - 31th JANNAF Combustion Meeting C2 - 1994/10/17/ C3 - Proceedings of the 31th JANNAF Combustion Meeting CY - Sunnyvale, CA DA - 1994/10/17/ PY - 1994/10/17/ ER - TY - CONF TI - Analysis of Plasma-Augmented Burn Rates for JA2 Propellant AU - Oberle, W.E. AU - Stobie, I.C. AU - Del Guercio, M. AU - Bourham, M.A. AU - Gilligan, J.G. T2 - 31th JANNAF Combustion Meeting C2 - 1994/10/17/ C3 - Proceedings of the 31th JANNAF Combustion Meeting CY - Sunnyvale, CA DA - 1994/10/17/ PY - 1994/10/17/ ER - TY - JOUR TI - Initial Results on High Enthalpy Plasma Generation in a Magnetized Coaxial Source AU - Mayo, R. M. AU - Bourham, M. A. AU - Caress, R. W. AU - Black, D. C. AU - Glover, M. E. T2 - Fusion Technology AB - Initial investigation on high enthalpy plasma stream generation in the North Carolina State University Coaxial Plasma Source[1] (CPS) facility is presented. Tenuous, yet high enthalpy, flows are produced from this Magnetized Coaxial plasma Gun (MCG) which allow laboratory study of plasma streams with a wide variety of applications. The applicability includes, but is not limited to, advanced thrusters for electric space propulsion, astrophysical jets and critical ionization phenomena, magnetic fusion compact toroid devices and tokamak fueling, large scale plasma etching and deposition, etc. DA - 1994/11// PY - 1994/11// DO - 10.13182/fst94-a40318 VL - 26 IS - 3P2 SP - 1221-1225 J2 - Fusion Technology LA - en OP - SN - 0748-1896 UR - http://dx.doi.org/10.13182/fst94-a40318 DB - Crossref ER - TY - JOUR TI - Electrothermal Plasma Gun as a Pellet Injector AU - Kincaid, R.W. AU - Bourham, M.A. T2 - Fusion Technology AB - The NCSU electrothermal plasma gun SIRENS has been used to accelerate plastic (Lexan polycarbonate) pellets, to determine the feasibility of the use of electrothermal guns as pellet injectors. The use of an electrothermal gun to inject frozen hydrogenic pellets requires a mechanism to provide protective shells (sabots) for shielding the pellet from ablation during acceleration into and through the barrel of the gun. The gun has been modified to accommodate acceleration of the plastic pellets using special acceleration barrels equipped with diagnostics for velocity and position of the pellet, and targets to absorb the pellet's energy on impact. The length of the acceleration path could be varied between 15 and 45 cm. The discharge energy of the electrothermal gun ranged from 2 to 6 kJ. The pellet velocities have been measured via a set of break wires. Pellet masses were varied between 0.5 and 1.0 grams. Preliminary results on 0.5 and 1.0 g pellets show that the exit velocity reaches 0.9 km/s at 6 kJ input energy to the source. Higher velocities of 1.5 and 2.7 km/s have been achieved using 0.5 and 1.0 gm pellets in 30 cm long barrel, without cleaning the barrel between the shots. DA - 1994/11// PY - 1994/11// DO - 10.13182/fst94-a40228 VL - 26 IS - 3P2 SP - 637-641 J2 - Fusion Technology LA - en OP - SN - 0748-1896 UR - http://dx.doi.org/10.13182/fst94-a40228 DB - Crossref ER - TY - JOUR TI - Diagnostics Modules for Tokamak Disruption Experiments AU - Nahm, M.L. AU - Buchanan, C.D. AU - Bourham, M.A. AU - Gilligan, J.G. T2 - Fusion Technology AB - Diagnostic modules equipped with various sensors can provide useful information on key parameters for disruption events, e.g. energy deposition, vapor shielding effect, plasma pressure and force distribution. The modules are, basically, DIMES samples (Divertor Materials Evaluation System) equipped with sensors, coupled to digitizing unites and interfaced to a data acquisition system. The DIMES samples are part of the lower divertor diagnostics on the DIII-D tokamak. Three top-cap prototype diagnostics modules have been designed and fabricated. The initial testing and calibration have been performed using the SIRENS plasma gun at an energy deposition of 1 to 12 MJ/m2 over 0.1 to 1.0 ms, with a plasma pressure >100 MPa. DA - 1994/11// PY - 1994/11// DO - 10.13182/fst94-a40225 VL - 26 IS - 3P2 SP - 618-622 J2 - Fusion Technology LA - en OP - SN - 0748-1896 UR - http://dx.doi.org/10.13182/fst94-a40225 DB - Crossref ER - TY - JOUR TI - Erosion of Plasma-Facing Components Under Simulated Disruption-Like Conditions Using an Electrothermal Plasma Gun AU - Bourham, M.A. AU - Gilligan, J.G. T2 - Fusion Technology AB - The NCSU electrothermal plasma gun, SIRENS, has been used to evaluate the erosion behavior of plasma-facing components under conditions simulating plasma disruption in tokamaks. The device is capable of producing conditions with heat fluence up to 10 MJ/m2 over 0.1 and 0.25 ms pulse duration. In future large tokamaks, plasma-facing components are expected to receive heat fluxes during a plasma disruption, which may exceed 100 GW/m2 over 0.01–5 ms. The vapor, which is developed at the ablating surface, absorbs a fraction of the incoming plasma energy. Candidate plasma-facing materials have been exposed to heat fluxes in the SIRENS facility (primarily from a blackbody spectrum photons), up to 100 GW/m2 over 0.1–0.25 ms. The vapor shielding effect has been demonstrated and analyzed for the divertor candidate materials. DA - 1994/11// PY - 1994/11// DO - 10.13182/fst94-a40209 VL - 26 IS - 3P2 SP - 517-521 J2 - Fusion Technology LA - en OP - SN - 0748-1896 UR - http://dx.doi.org/10.13182/fst94-a40209 DB - Crossref ER - TY - RPRT TI - Measurements of actinide transmutation in the hard spectrum of a fast reactor AU - Trybus, C L; AU - Collins, P J; AU - Maddison, D W; AU - Bunde, K A; AU - Palmtag, S ; AU - Palmiotti, G DA - 1994/11// PY - 1994/11// UR - https://www.osti.gov/scitech/biblio/204716-measurements-actinide-transmutation-hard-spectrum-fast-reactor ER - TY - RPRT TI - MCNP: Multigroup/adjoint capabilities AU - Wagner, J.C.; AU - Redmond, E.L. II; AU - Palmtag, S.P.; AU - Hendricks, J.S. A3 - Office of Scientific and Technical Information (OSTI) AB - This report discusses various aspects related to the use and validity of the general purpose Monte Carlo code MCNP for multigroup/adjoint calculations. The increased desire to perform comparisons between Monte Carlo and deterministic codes, along with the ever-present desire to increase the efficiency of large MCNP calculations has produced a greater user demand for the multigroup/adjoint capabilities. To more fully utilize these capabilities, we review the applications of the Monte Carlo multigroup/adjoint method, describe how to generate multigroup cross sections for MCNP with the auxiliary CRSRD code, describe how to use the multigroup/adjoint capability in MCNP, and provide examples and results indicating the effectiveness and validity of the MCNP multigroup/adjoint treatment. This information should assist users in taking advantage of the MCNP multigroup/adjoint capabilities. DA - 1994/4/1/ PY - 1994/4/1/ DO - 10.2172/10145615 VL - 4 PB - Office of Scientific and Technical Information (OSTI) UR - https://www.osti.gov/scitech/biblio/10145615-mcnp-multigroup-adjoint-capabilities ER - TY - BOOK TI - A Handbook on the community college in America its history, mission, and management DA - 1994/// PY - 1994/// PB - Westport, Conn: Greenwood Press ER -