Commercialization of atom interferometers for borehole gravity gradiometry. Fourth quarterly report, July--September 1993.

摘要

The present status of tasks is: Task 1- Solution of tomography problem (completed qtrs. 1 and 2), Task 2- Study influence of vibrations (completed qtr. 3), Task 3- List of borehole imposed constraints (completed qtr.3 with update this qtr.), Task 4- Evaluate merits of various cooling schemes (completed this qtr.), Task 5- Specify magnet system requirements (completed qtr. 3), Task 6-Specify laser system (in progress), and Task 7- a. specify detector, b. specify gratings and layout, c. specify gratings and magnet spacers, d. specify vacuum system (all in progress). During this quarter, we report an update to Task 3, as well as the completion of Task 4. Work on Tasks 6 and 7 is in progress. The use of a magneto-optic trap (MOT), the choice of atomic species, state of the art for lithium MOT's, use of lenses to increase the intensity, computerized simulation of system throughtput, and magnetic lens design are the topics addressed concerning Task 4.