Instrumental effects on the temperature and density derived from the light ion mass spectrometer
Abstract
An expression for the flux into a retarding potential analyzer (RPA) is derived which takes into account the instrumental effect of a dependence on energy of the solid angle of the acceptance cone. A second instrumental effect of a limited bandpass is briefly discussed. Using the (LIMS) instrument on SCATHA, it is shown that temperatures and densities derived without considering the effect of the solid angle dependence on energy will be too low, dramatically so for E(t) E(1), where E(1) is the e folding distance of the solid angle dependence and E(t) is the thermal energy of the plasma. For E(t) E(1), there is effectively no impact on the derived temperatures and densities if the solid angle effect is ignored.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 June 1983
 Bibcode:
 1983STIN...8330994C
 Keywords:

 Instrument Errors;
 Ion Density (Concentration);
 Ion Temperature;
 Mass Spectrometers;
 Scatha Satellite;
 Accuracy;
 Angles (Geometry);
 Curve Fitting;
 Field Of View;
 Flux (Rate);
 Mathematical Models;
 Instrumentation and Photography