ELECTRON DENSITY MEASUREMENT SYSTEM FOR PARTIALLY IONIZED GASES

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$59,756.00
Award Year:
1990
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
12996
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Spire Corp
Patriots Pk, Bedford, MA, 01730
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Yi-kang Pu
(617) 275-6000
Business Contact:
() -
Research Institution:
n/a
Abstract
A RADIO FREQUENCY MULTI-CHANNEL PROBE ARRAY METHOD IS PROPOSED TO DETERMINE THE DENSITIES OF PLASMAS PRODUCED IN LABORATORY CHAMBERS BY HIGH POWER MICROWAVE BREAKDOWN. IN ADDITION TO MAKING TIMERESOLVED MEASUREMENTS OF ELECTRON DENSITY, THE ARRAY WILL ALSO PROVIDE SPATIAL INFORMATION ON THE PLASMA DENSITY PROFILE. THE PROBE ARRAY METHOD IS BASED ON THE DIRECT RELATIONSHIP BETWEEN THE ELECTRICAL RESISTIVITY OF THE PLASMA AND THE ELECTRON DENSITY, TAKING ADVANTAGE OF THE HIGH COLLISIONALITY OF THE CHARGE CARRIERS WITH THE NEUTRAL GAS PARTICLES. THIS METHOD IS EXPECTED TO MEASURE ELECTRON DENSITIES RANGING FROM 10(4) TO 10(10)CM(-3) IN PLASMAS WITH NEUTRAL GAS PRESSURE OF 0.01 TO 3 TORR. WITH SUFFICIENTLY HIGH FREQUENCY (3 MHZ OR MORE), A TIME RESOLUTION OF 10 MICROSECONDS CAN BE EASILY OBTAINED IN DENSE PLASMAS; DC PROBE DRIVE IS PROPOSED FOR TIME-RESOLVED MEASUREMENTS OF VERY LOW PLASMA DENSITIES. THE TWODIMENSIONAL PROBE ARRAY IS CAPABLE OF DETERMINING A LINE-AVERAGED PLASMA DENSITY PROFILE. THE PROBE TECHNIQUE WILL BE ESPECIALLY IMPORTANT IF THE SPATIAL UNIFORMITY OF THE PLASMA MUST BE MONITORED AND CONTROLLED.

* information listed above is at the time of submission.

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