Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..gec.gw203l&link_type=abstract
American Physical Society, Gaseous Electronics Conference October 5-8, 1999 Norfolk, VA, abstract #GW2.03
Physics
Scientific paper
Since the early 1960's, numerical models have been successful in reproducing experimental measurements of discharge parameters (electric field, electron density, radiation efficiency etc.) in conventional fluorescent lamps. These lamps operate with a few micron of mercury vapor in a few torr of buffer gas (usually argon) in a discharge column of 1-2 cm radius, with typical current densities 20-100 mAcm^(-2). Recent developments in the lighting industry have been towards "highly loaded" lamps, with current densities far in excess of these values. Examples are sub-miniature lamps, with discharge radii of order 2 mm and "electrodeless" lamps, in which the absence of electrodes permits standard size lamps to operate at much higher discharge currents. Numerical models have been less succesful in describing these discharges. Since radiation accounts for 60-80% of the power balance, it is natural to question the role of radiation transport in determining the discharge parameters. Recent experimental and numerical work (J.E. Lawler, invited paper, this conference) has re-examined this issue, particularly with repsect to UV radiation. Further, the cross sections of a number of important electron imapct excitation and chemi-ionization processes are poorly known. Finally, most models assume that the electron energy distribution function is "local" and Maxwellian for energies below the first excited state of mercury, with various approximations used regarding the depeletion of the high energy tail. This paper will discuss these issues and current activitries to improve the quality of data and the theoretical basis for these models.
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