PAC09 - List of Authors (O'Conor, J.G.)

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

O'Conor, J.G.

Paper	Title	Page
TH5RFP017	Grad-Level Radiation Damage of SiO2 Detectors	3479
	N. Simos, G. Atoian, H. Ludewig, J.G. O'Conor, S.N. White BNL, Upton, Long Island, New York N.V. Mokhov Fermilab, Batavia
	Funding: Work performed under the auspices of the US Department of Energy SiO2 quartz fibers of the LHC ATLAS 0-degree calorimeter (ZDC) anticipated to experience integrated doses of a few Grad at their closest position were exposed to 200 MeV protons and neutrons at the BNL Linac. Specifically, 1mm- and 2mm- diameter quartz (GE 124) rods were exposed to direct 200 MeV protons during the first phase of exposure leading to peak integrated dose of ~28 Grad. Exposure to a primarily neutron flux of 1mm-diameter SiO2 fibers was also achieved with a special neutron source arrangement. In a post-irradiation analysis the quartz fiber transmittance was evaluated as a function of the absorbed dose. Dramatic degradation of the transmittance property was observed with increased radiation damage. In addition, detailed evaluation of the fibers under the microscope revealed interesting micro-structural damage features and irradiation-induced defects. This paper presents the results of the irradiation damage study.

Paper

Title

Page

TH5RFP017

Grad-Level Radiation Damage of SiO2 Detectors

3479

N. Simos, G. Atoian, H. Ludewig, J.G. O'Conor, S.N. White
BNL, Upton, Long Island, New York
N.V. Mokhov
Fermilab, Batavia

Funding: Work performed under the auspices of the US Department of Energy

SiO2 quartz fibers of the LHC ATLAS 0-degree calorimeter (ZDC) anticipated to experience integrated doses of a few Grad at their closest position were exposed to 200 MeV protons and neutrons at the BNL Linac. Specifically, 1mm- and 2mm- diameter quartz (GE 124) rods were exposed to direct 200 MeV protons during the first phase of exposure leading to peak integrated dose of ~28 Grad. Exposure to a primarily neutron flux of 1mm-diameter SiO2 fibers was also achieved with a special neutron source arrangement. In a post-irradiation analysis the quartz fiber transmittance was evaluated as a function of the absorbed dose. Dramatic degradation of the transmittance property was observed with increased radiation damage. In addition, detailed evaluation of the fibers under the microscope revealed interesting micro-structural damage features and irradiation-induced defects. This paper presents the results of the irradiation damage study.