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Lamport, J. E.

Publications and source records attributed to Lamport, J. E..

9 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1980

The high energy cosmic ray detector for Spacelab II

A large cosmic ray detector to be flown on Spacelab II is presently under construction at the University of Chicago. The instrument, with a geometric factor of 5 sq m-ster, is designed to measure the elemental composition and the energy spectra of individual cosmic ray nuclei (Li to Fe) from 50 GeV/nucleon to several TeV/nucleon. Plastic scintillators are used for charge determination, and gas Cerenkov and transition radiation detectors for energy measurements. The instrument and its functions are described, and several test results that are important for an optimum design are discussed.

Lamport, J. E.↗
NASA NTRS1974

Electrons and protons accelerated in Mercury's magnetic field

Fluxes of protons with energies of about 550 kev and electrons with energies of about 300 kev which exceed approximately 10,000 and 100,000 per sq cm per sec, respectively, have been discovered in the magnetosphere of Mercury. Electron fluxes greater than 1000 per sq cm per sec are also observed in the outbound pass of the Mariner 10 spacecraft through the magnetosheath. The intensity vs time profiles of the particle fluxes in the magnetosphere appear with sudden onsets beginning at interplanetary background levels and persisting for times equivalent to their being distributed spatially over regions having a scale size comparable to the planetary radius. It is shown that the radiation events observed in the magnetosphere and magnetosheath are transient and are not interpretable in terms of stable trapped particle populations.

Simpson, J. A.↗
NASA NTRS1974

Search by Mariner 10 for electrons and protons accelerated in association with Venus

Results of a search, with the aid of Mariner 10, for electrons and protons produced by acceleration occurring from the interaction of the solar wind and interplanetary field with the Venusian ionosphere. No evidence was found for Venus-associated particle fluxes with instrumentation capable of measuring flux variations approximately 1000 times smaller than those of the Mariner 5 detectors for charged particles, although the Mariner 10 measurements were made in the presence of an interplanetary particle flux that was extremely stable and characteristic of minimum solar activity. In addition, no evidence was obtained for electron or proton fluxes in the vicinity of the planet, nor any evidence for electron bursts in or near the observed bow shock, thus giving rise to the conclusion that Venus has no magnetosphere.-

Simpson, J. A.↗
NASA NTRS1972

Advanced technical developments in support of scientific experiments in space

A technique was developed for preparing solid state, lithium-drifted silicon detectors. Hollow cylindrical detectors were built and tested for possible use as anticoincidence shields to replace conventional plastic scintillators and photomultipliers. A fission cell was developed for the Pioneer F/G instruments and the IMP I subsystem. An electron current detector was developed for Jovian belt measurements of electron flux. A number of circuits and semiconductor devices was also developed.

Lamport, J. E.↗