Session GW1: Lighting Plasmas
8:00 AM–9:30 AM, Wednesday, October 3, 2007
Doubletree Crystal City Room: Crystal Ballroom A
Chair: John Curry, NIST
Abstract ID: BAPS.2007.GEC.GW1.3
Abstract: GW1.00003 : Investigations of HID Lamp Electrodes under HF Operation
8:30 AM–8:45 AM
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Abstract 
Authors:
Jens Reinelt
(Ruhr-University Bochum)
Oliver Langenscheidt
(Ruhr-University Bochum)
Michael Westermeier
(Ruhr-University Bochum)
Juergen Mentel
(Ruhr-University Bochum)
Peter Awakowicz
(Ruhr-University Bochum)
Low pressure lamps are operated many years at high frequencies to improve the efficiency of these lamps and drivers. For high pressure discharge lamps this operation mode has not been installed yet. Generally it can be assumed that there are changes in the electrode physics which may lead to an undesired lamp behavior if HID lamps are operated at a high frequency. To gain insights into these fundamental changes the so called Bochum Model Lamp is used. It is an easy system which allows a fundamental research on HID electrode behavior and the near electrode region without the occurrence of acoustic resonances. For the investigation phase resolved photography, pyrometry and spectrometry is used. The presented results describe changes in the electrode temperature and changes in the kind of arc attachment on the electrodes (diffuse and spot mode) depending on frequency. Also measurements of the Electrode-Sheath-Voltage (ESV), depending on frequency, are presented.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.GEC.GW1.3