Accession Number : AD0284290

Title :   A SPIN-ECHO MEMORY FOR A CARRIER TYPE DIGITAL COMPUTER

Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s) : WANLASS,L.K.

Report Date : 28 AUG 1961

Pagination or Media Count : 1

Abstract : Electron spin-echo was studied as a possible carrier digital computer memory element at microwave frequencies. A general study is made of solid state paramagnetic crystals as possible storage materials. Spin-spin and spin-lattice relaxation times are considered in general, and were measured for calcite, silicon, and other crystals. A study was made of cross-relaxation in calcite using a stimulated spin-echo technique. A decrease in the potential storage time of this crystal by a factor of 8000 is reported due to this relaxation mechanism. Detailed measurements were made on the spinecho signals obtainable at microwave frequencies, and usable amplitude echoes are reported for many crystals and impurity concentrations. A study of noise sources and signal to noise ratios was made. An original system for storing the phase of phase script information pulses was investigated. A complete carrier computer regenerative memory system using two spin-echo devices and a single connecting channel was considered. The storage capacity of the memory device was theoretically determined. (Author)

Descriptors :   *MEMORY DEVICES, *DATA STORAGE SYSTEMS, BARIUM COMPOUNDS, CALCITE, CRYOGENICS, DIGITAL COMPUTERS, NUCLEAR SPINS, OSCILLATORS, RUBY, SILICON, SULFATES

Distribution Statement : APPROVED FOR PUBLIC RELEASE