Irradiation Studies of Optical Components 4 3 2 5 1 CERN, ~ April 15-24, 2005 1 GeV proton beam 4 x 10 15 proton Irradiation dose: equivalent to 40 pulses.

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Presentation transcript:

Irradiation Studies of Optical Components CERN, ~ April 15-24, GeV proton beam 4 x proton Irradiation dose: equivalent to 40 pulses of 24 GeV proton beam Received radiation dose: 3231 Gy, ~ 3.2 x 10 5 rad or 3.2 x 10 6 rem (assume a quality factor of 10)

Before irradiation April, 2005 Optical components

Irradiation summary – transmittance/reflectance measurements Activity right after irradiation: 4 mSv/h on contact 30 µSv/h at 50 cm away Activity ~ 1 month later (5/23/05): 0.5 mSv/hr on contact (50 µrem/h) Activity arrived at BNL ~ background level

3-feet long of Schott imaging fiber before and after irradiation before after 50 x500 x I = I o e -αt From fused silica results: α = 0.62, for t = 0.1 cm Projected transmission for t=3-ft of the imaging fiber: e -(0.62)(91 cm) = 3 x !!! for ~40 proton pulses If α is linearly prop. to # of proton pulses, transmission for 1 proton pulse = 0.244

Fujikura imaging fibers

Sumitomo imaging fibers IGN-08/20 - sample 5 meter limit >20 meter available All have small imaging area <2 mm diameter