Lifetime testing UV LEDs for use in the LISA charge management system. (26th September 2017)

• Record Type: Journal Article
• Authors: Hollington, D; Baird, J T; Sumner, T J; Wass, P J
• Is Part Of: Classical and quantum gravity. Volume 34:Number 20(2017:Oct.)
• Publication Date: 2017-09-26
• Subjects: LISA -- UV LED -- charge management -- lifetime -- discharging; Quantum gravity -- Periodicals; Gravitation -- Periodicals; Relativity (Physics) -- Periodicals; Space and time -- Periodicals; Periodicals; 521.1
• DOI: 10.1088/1361-6382/aa87eb
• Languages: English
• ISSNs: 0264-9381

Abstract

Abstract: As a future charge management light source, UV light-emitting diodes (UV LEDs) offer far superior performance in a range of metrics compared to the mercury lamps used in the past. As part of a qualification program a number of short wavelength UV LEDs have been subjected to a series of lifetime tests for potential use on the laser interferometer space antenna (LISA) mission. These tests were performed at realistic output levels for both fast and continuous discharging in either a DC or pulsed mode of operation and included a DC fast discharge test spanning 50 days, a temperature dependent pulsed fast discharge test spanning 21 days and a pulsed continuous discharge test spanning 507 days. Two types of UV LED have demonstrated lifetimes equivalent to over 25 years of realistic mission usage with one type providing a baseline for LISA and the other offering a backup solution.