Albert J. Lieber

Nanosecond Gating of Proximity Focused Channel Plate Intensifiers

Vidicon coupled, proximity‐focused channel plate image intensifiers are currently being gated by 4 nsec FWHM pulses. Resolution achieved is better than 9 line pairs/mm on the intensifier photocathode.

Investigation of micro-channel plates as parallel-bore electron collimators for use in a proximity-focused ultra-fast streak tube☆

Abstract Micro-channel plates have been investigated for use as parallel-bore electron collimators for energies up to 10 keV. The collimation quality of plates of three aspect ratios has been measured using a dc beam. Measured angular acceptance profiles indicate good collimation. This investigation was carried out as part of a design study of an ultra-fast proximity-focused streak tube using a micro-channel plate for transverse photoelectron velocity selection.

Nanosecond High Resolution Framing Camera

A framing camera employing proximity focused image intensifiers with an effective frame rate of 108 frames/sec and a spatial resolution of greater than 10 line pairs/mm on the 25 mm diam photocathode has been constructed and tested. The camera consists of six proximity focused image intensifiers coupled in a hexagonal array. This array may be viewed by either a standard film camera or an image orthicon television camera for remote monitoring. Interframe duration is adjustable from overlapping to several times the frame duration. Frame duration is adjusted by changing the pulse width from the main pulse generator. The shuttering circuit demonstrates zero interframe jitter and accurately known interframe and frame durations. Tests indicate there is no physical reason this technique cannot be extended to equivalent frame rates of greater than 109 frames/sec using low resistance photocathodes.

Investigation of microchannel plates as parallel‐bore collimators for electron pulses

Microchannel plates have been investigated for use as parallel‐bore collimators using a chopped electron beam. This note compares the collimation ability of plates with theory and gives transmission results. It is found that collimation ability approaches the ideal collimator when pulse duration does not allow charge buildup on tubule walls of the plate.

Micro-channel plate as a parallel-bore collimator for soft X-ray imaging☆

Abstract We show that a micro-channel plate may be used as a parallel-bore collimator for imaging the soft X-rays emitted in laser-target interactions. Using Fe K radiation, we find experimentally that degradation of spatial resolution due to grazing-angle reflections is a negligible effect. A camera made of a commercially available micro-channel plate of 9 μm bore diameter can give spatial resolution better than 20 μm.

Time Correlation Method for Extracting a Fast Rising Component from a Complex Pulse

A technique of shape discrimination, especially useful for certain types of input pulses, is presented. The parametric response of a system employing this technique is examined. The results of an experimental evaluation are discussed.