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An initial assessment of the robust and compact hybrid environmental lidar (RACHEL)

(2010)

Authors:

AC Povey, DM Peters, RG Grainger, D Rees, JL Agnew

Abstract:

The Robust And Compact Hybrid Environmental Lidar (RACHEL) is a 355nm, 4-channel Raman lidar system that has been developed for unattended, continuous measurement of the distributions of particulates, water vapour, and other pollutants in the boundary layer and troposphere, including the capacity for scanning the full hemisphere. The system has been designed to be portable and low-cost, providing the potential to investigate a wide range of environments with a single instrument. Deployment at the beginning of 2010 at the STFC Chilbolton Observatory has provided a unique opportunity to cross-compare the instrument against the numerous lidar and radar systems stationed at the observatory and to evaluate the implementation of various measurements into the data evaluation, such as radiosondes, radiometers, and aircraft observations. The system was deployed during the Eyjafjallajökull eruption of April 2010, observing the appearance and evolution of the ash plume over southern England.
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Some implications of sampling choices on comparisons between satellite and model aerosol optical depth fields

ATMOSPHERIC CHEMISTRY AND PHYSICS 10:22 (2010) 10705-10716

Authors:

AM Sayer, GE Thomas, PI Palmer, RG Grainger
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The inter-comparison of major satellite aerosol retrieval algorithms using simulated intensity and polarization characteristics of reflected light

ATMOSPHERIC MEASUREMENT TECHNIQUES 3:4 (2010) 909-932

Authors:

AA Kokhanovsky, JL Deuze, DJ Diner, O Dubovik, F Ducos, C Emde, MJ Garay, RG Grainger, A Heckel, M Herman, IL Katsev, J Keller, R Levy, PRJ North, AS Prikhach, VV Rozanov, AM Sayer, Y Ota, D Tanre, GE Thomas, EP Zege
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Transport impacts on atmosphere and climate: Shipping

ATMOSPHERIC ENVIRONMENT 44:37 (2010) 4735-4771

Authors:

Veronika Eyring, Ivar SA Isaksen, Terje Berntsen, William J Collins, James J Corbett, Oyvind Endresen, Roy G Grainger, Jana Moldanova, Hans Schlager, David S Stevenson
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The radiation tolerance of specific optical fibres exposed to 650 kGy(Si) of ionizing radiation

Journal of Instrumentation IOP Publishing 4:7 (2009)

Authors:

B Arvidsson, K Dunn, Cigdem Issever, Brian Huffman, M Jones, J Kierstead, G Kuyt, T Liu, A Povey, E Regnier, Anthony Weidberg, A Xiang, J Ye

Abstract:

The LHC upgrade will extensively increase the area of silicon detectors used in the ATLAS experiment and require substantial changes to the readout system of both the ATLAS and CMS experiments. The two experiments are expected to use optical systems for part of the data and control paths which must withstand levels of radiation equivalent to a dose of approximately 400 kGy(Si) at 30 cm from the collision region (including a safety factor of 1.5). As part of the search for acceptably radiation hard optical fibres, four Graded Index multimode (GRIN) optical fibres and one single-mode (SM) fibre were tested to 650 kGy(Si) equivalent dose. One of the GRIN fibres was also tested at 5 different dose rates, in order to understand the dose rate effects. These tests have validated the radiation tolerance of a single-mode fibre and two multimode fibres for use at the SLHC for warm operation. Some interesting features of the time dependence of the fibre radiation damage and future plans are discussed. © 2009 IOP Publishing Ltd and SISSA.
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