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Title: SEMIANNUAL REPORT FOR THE PERIOD JULY 1 TO DECEMBER 31, 1962

Abstract

The status of experiments on electron scattering, photoproduction of mesons, wide-angle muon pair production, photoproduction of pairs with large momentum transfers, photoproduction of sigma particles, pion production in peripheral processes, wide-angle electron pair production, and the Compton effect at 1 to 3 Bev is summarized. The status of shielding studies, spark chamber studies of photoproduction, and bubble chamber investigations are also included. Magnets, targets, ejection-type vacuum chambers, photon-beam drift tubes and collimators, detectors, cables, cryogenic cooling equipment, radiation detectors, and construction of supplementary shielding walls were involved in design efforts and procurement of equipment and facilities. Modifications and improvements at the accelerator proper were made on the magnet power supply, the r-f system, the Drivac high-vacuum pumps and other components and facilities. Operation at energies up to 6.2 Bev and with intensities up to 30% of design intensity (6 x 10/ sup 12/ electrons/sec) was achieved. Data of a technical nature are very limited. (D.C.W.)

Publication Date:
Research Org.:
Cambridge Electron Accelerator, Mass.
Sponsoring Org.:
US Atomic Energy Commission (AEC)
OSTI Identifier:
4728812
Report Number(s):
CEAL-1003
NSA Number:
NSA-17-019415
DOE Contract Number:
AT(30-1)-2076
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-63
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; BEAM OPTICS; BEAMS; BUBBLE CHAMBERS; CEA; CIRCUITS; COLLIMATORS; COMPTON EFFECT; COOLING; CRYOGENICS; DETECTION; ELECTRON BEAMS; ELECTRONS; ELEMENTARY PARTICLES; ENERGY RANGE; LENSES; MAGNETS; MEASURED VALUES; MESONS; MICROWAVES; MUONS; OPERATION; OPTICAL SYSTEMS; PAIR PRODUCTION; PHOTONS; PHOTOPRODUCTION; PIONS; POWER; PUMPS; RADIATIONS; SCATTERING; SHIELDING; SIGMA PARTICLES; SPARK CHAMBERS; SYNCHROTRONS; TARGETS; TESTING; TUBES; VACUUM; WIRES

Citation Formats

None. SEMIANNUAL REPORT FOR THE PERIOD JULY 1 TO DECEMBER 31, 1962. United States: N. p., 1963. Web. doi:10.2172/4728812.
None. SEMIANNUAL REPORT FOR THE PERIOD JULY 1 TO DECEMBER 31, 1962. United States. doi:10.2172/4728812.
None. Fri . "SEMIANNUAL REPORT FOR THE PERIOD JULY 1 TO DECEMBER 31, 1962". United States. doi:10.2172/4728812. https://www.osti.gov/servlets/purl/4728812.
@article{osti_4728812,
title = {SEMIANNUAL REPORT FOR THE PERIOD JULY 1 TO DECEMBER 31, 1962},
author = {None},
abstractNote = {The status of experiments on electron scattering, photoproduction of mesons, wide-angle muon pair production, photoproduction of pairs with large momentum transfers, photoproduction of sigma particles, pion production in peripheral processes, wide-angle electron pair production, and the Compton effect at 1 to 3 Bev is summarized. The status of shielding studies, spark chamber studies of photoproduction, and bubble chamber investigations are also included. Magnets, targets, ejection-type vacuum chambers, photon-beam drift tubes and collimators, detectors, cables, cryogenic cooling equipment, radiation detectors, and construction of supplementary shielding walls were involved in design efforts and procurement of equipment and facilities. Modifications and improvements at the accelerator proper were made on the magnet power supply, the r-f system, the Drivac high-vacuum pumps and other components and facilities. Operation at energies up to 6.2 Bev and with intensities up to 30% of design intensity (6 x 10/ sup 12/ electrons/sec) was achieved. Data of a technical nature are very limited. (D.C.W.)},
doi = {10.2172/4728812},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Feb 01 00:00:00 EST 1963},
month = {Fri Feb 01 00:00:00 EST 1963}
}

Technical Report:

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  • 8 9 = ; 7 8 < : ; 8 5 E 9 8 were tested on the Model C stellarator showing good experimental and theoretical agreement. Equilibrium of a toroidal plasma with a conducting aperture limiter was also examined experimentally and theoretically. Measurements of floating potential differences at the bottom and top showed a pronounced positive potential peak. Studies of the effect of a helical field on plasma behavior showed the measured transform to agree well with the calculated values. Use of the absolute intensities of spectral lines in the vacuum ultraviolet region of stellarator emission for diagnostic purposesmore » was examined; a vacuum monochromator device was used with acceptable results on the stellarator. A technique was developed for using the change in the ratio of the intensity of certain resonance multiplets of impurity ions to determine the electron temperature; tests using various impurity ions showed varying agreement with other determinations. Temperature determinations made using Doppler broadening of spectral lines compared well with the conductivity temperature at low currents. The vacuum ultraviolet monochromator was used to study the power loss due to impurity radiation; the power loss was compared to the input power. For a He discharge, between 30 and 100% of the input energy was lost as radiation. Current steps in the current trace of plasmas dominated by runaway electrons were examined. No appreciable chainge in cyclotron radiation was noted for step losses to the wall; for the absorption type of steps, the data support a model involving an electron-electron two stream instability. A 4-mm microwave interferometer was used to study the electron density distribution by measuring the propagation of the extraordinary mode. The dispersion curves compare favorably with graphs of a theoretical cold plasma dispersion relation. The return of the hydrogen gas that is removed during ohmic heating was also studied. Neutral gas return from the walls was found time dependent, and the percentage return proved small for several msec. The Etude device was used to investigate the presence of fluctuating electric fields transverse to the confining field as a cause of high electron loss during ohmic heating. The arrangement was deemed capable of accounting for ion diffusion across the magnetic field and for part of the electron diffusion. Experimental and theoretical curves for potential distribution made with the L-2 device agree well. Plasma heating by absorption of ion-cyclotron waves in a region of decreasing magnetic field was investigated in the B-66 device using diamagnetic probe measurements, an ion energy analyzer, and impurity measurements. The waves were concluded to heat deuterons to a temperature around 100 v. The Q-1 low-temperature Cs plasma device was used to study longitudinal trandsport phenomena. At low currents experimental and theoretical results agreed. Research on damping and propagation of ion acoustic waves in highly ionized plasmas gave evidence for collisionless damping of ion waves. Langmuir probes were used in and extensive study of space and timc dependence of the plasma density in a Stellarator. Results are graphed. Work in kinetic theory included development of a convergent classical kinetic equation for a plasma, derivation of a two-particle correlation function for an unstable plasma, investigation of charge neutrality for a Coulomb system in thermal equilibrium, and extension of the expansion for a weakly coupled spatial homogeneous system to fourth order. Stability studies dealt with the effect of a finite gyration radius on stellarator stability, the effect of finite conductivity on hydromagnetic instabilities, stability of hydromagnetic systems with dissipation, some results of quasi-linear theory, computer investigations of current instabilities, and the effects of viscosity and heat conductivity upon oscillations of current-carrying plasmas. The high-frequency conductivity of a plasma was also studied« less
  • The ML-1 power plant produced electrical power for the first time on September 21, 1962. All objectives of the initial experiment were achieved. In general, plant performance was about as predicted with the exception that unanticipated high temperatures were observed in the upper tube sheet of the reactor calandria. This condition was subsequently attributed, in major part, to energy deposition in the tube sheet from hot gas flow which bypassed the fuel element insulation through imperfect fuel element seats. The shutdown period was devoted to installation of a dynamometer (for load absorption during future testing), installation of the Milletron Computer,more » installation of the deoxygenation system, and the completion of minor modifications to the plant. The IB-8T-2 (ML-1 first core prototype) in-pile experiment was concluded on October 7 after more than 10,000 hours of satisfactory operation. Investigations of the cause of embrittlement in the IB-8T-1 in-pile test specimen were continued without definite resolution of the phenomenon. Engineering work was completed, hardware procured, and disassembly and reassembly completed for the modification of the TCS-670 to improve performance and eliminate certain mechanical deficiencies. Engineering for the modification of the CSN1 turbine compressor set to improve performance was completed. The assembly of the alternator and start motor was completed and preliminary performance tests of the alternator were initiated. The performance specification of the ML-1A power plant was completed and submitted to the USAEC. (auth)« less
  • >The initial experimental work on the high-field superconducting characteristics has started with an investigation of the effect of grain size on the critical field-critical current (H/sub c/ - I/sub c/) relationship. Measurements have been made which show an anomalous behavior of H/sub c/ versus I/ sub c/ for a certain range of grain sizes. Initial experiments on the properties of superconducting thin filaments have been performed on samples consisting of lead imbedded in a copper matrix. The results have indicated that sizedependent behavior occurs before it would be expected on a theoretical basis. It is possible that the normal coppermore » electrons are severely affecting the superconducting properties of the lead. (auth)« less
  • Contents: Very low frequency wave propagation; Electron and solid state physics; Control theory and applications; Electronic circuits and instrumentation; Electromagnetic phenomena: (antennas, coupled antennas and arrays, antennas and waves in dielectric, conducting, and plasma media, antennas and transmission lines).