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External-Fuel Thermionic Reactors
The concept of the external-fuel thermionic converter, in which the fuel surrounds an inner emitter annulus, is introduced and the major advantages of its use in a thermionic reactor are discussed. In-core reactors, ranging from 15-ekW to megawatts, can be designed based on external-fuel converter modules of fixed emitter and collector dimensions. Sizes and weights of typical reactors in this power range are shown.
Date:
May 1, 1968
Creator:
Abbate, M. J.; Eisen, C. L.; Raab, B. & Schock, Alfred
System:
The UNT Digital Library
The Multicomponent Laminar Boundary Layer Over Graphite Sphere Cones: Solutions for Quasisteady Ablation and Application to Transient Reentry Trajectories.
None
Date:
May 1, 1968
Creator:
Bartlett, E. P. & Grose, R. D.
System:
The UNT Digital Library
Diffusion in polycrystalline Y/sub 2/O/sub 3/ and Er/sub 2/O/sub 3/
A tracer sectioning technique was employed to measure cation self-diffusion coefficients in fully dense polycrystalline materials under oxidizing conditions. Results are D = 1.65x10/sup -2/ exp(-69,200/RT) cm/sup 2//s for Y/sub 2/O/sub 3/ (1400 to 1670/sup 0/C), and D = 1.48 exp(-102,200/RT) cm/sup 2//s for Er/sub 2/O/sub 3/ (1400 to 1700/sup 0/C). The greater activation energy for erbium diffusion in erbia is attributed to a mass effect. Oxygen diffusion coefficients were extracted from observations in the reoxidation of small single crystals of uniformly reduced oxides produced by vacuum fusion. The oxidation process proceeded by the development of a fully oxidized external shell, the growth of which was rate-limited by diffusion of interstitially dissolved oxygen through the oxidized layer to a sharp interface with the reduced material. The growth of the oxidized shell was followed by means of a thermobalance. Oxygen diffusion coefficients were calculated to be D = 6.01x10/sup -6/ exp(-19,600/RT) cm/sup 2//s for Y/sub 2/O/sub 3/ (1064 to 1276/sup 0/C), and by D = 4.76x10/sup -5/ exp(-30,100/RT) cm/sup 2//s for Er/sub 2/O/sub 3/ (1060 to 1292/sup 0/C).
Date:
May 1, 1968
Creator:
Berard, M.F.
System:
The UNT Digital Library
R-1 parametric shield studies on PAX: reactivity worth of mockup borated aluminum--titanium hydride shields
None
Date:
May 1, 1968
Creator:
Huen, A.
System:
The UNT Digital Library
Analysis of the engine resonance survey in the transverse direction at 3$sup 0$-45' (series I) of the vibration survey of XECF in ETS-1
This report was prepared as an account of work sponsored by an agency of the United States Government.
Date:
May 1, 1968
Creator:
Jellison, J. E.; Tow, D. & Rosser, R. C.
System:
The UNT Digital Library
Operation of the Cambridge Electron Accelerator for Fiscal Years 1968, 1969, and 1970
None
Date:
May 1, 1968
Creator:
Strauch, K
System:
The UNT Digital Library
Contract Work Statement. Supplement XXIV to Appendix B Dated February 1, 1968, Applicable to Modification No. 32. Work to Be Performed During the Period October 1, 1967--September 30, 1968
This report addresses a contract work statement.
Date:
May 1, 1968
Creator:
unknown
System:
The UNT Digital Library
Monthly report of activities: MAY 1, 1969
Some of the activities this month are: (1) The AEC authorization bill was passed by the House of Representatives on April 4 and by the Senate on April 8. It has been signed by the President. The 200 BeV accelerator is authorized for construction in fiscal year 1969, with a total authorization of $32.333 million. The appropriation bill is in the House at the time of this report. (2) A tentative decision has been made to incorporate an injection storage ring into the accelerator design. This ring, if built, will have the radius of the main synchrotron and will be mounted on the wall of the main-ring enclosure. In order to avoid confusion with the CERN ISR, we have decided to call our device the accumulator. Protons will be injected into the accumulator from the booster at 10 GeV kinetic energy. Thirteen bunches will be stored during the 2.6-second cycle. They will then be extracted from the accumulator in one turn and injected into the main ring. The principal advantage of the accumulator is that the booster works continuously rather than in short bursts. The repetition rate of the booster will therefore be reduced from 15 Hz to 5 Hz. …
Date:
May 1, 1968
Creator:
unknown
System:
The UNT Digital Library
Performance of three sizes of solid core nuclear engines for space missions
None
Date:
May 1, 1968
Creator:
unknown
System:
The UNT Digital Library
SNAP 19, Phase III. Volume II. Heat sources. Final report
None
Date:
May 1, 1968
Creator:
unknown
System:
The UNT Digital Library
Subcontract work statement. Supplementary agreement No. 7
None
Date:
May 1, 1968
Creator:
unknown
System:
The UNT Digital Library
XE-2 Operating Limits Document, Phase IA
None
Date:
May 1, 1968
Creator:
unknown
System:
The UNT Digital Library
XE-2 Safety Evaluation Report, Phase IA
None
Date:
May 1, 1968
Creator:
unknown
System:
The UNT Digital Library