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PMT Radiation Damage

PMT Radiation Damage. Yasar Onel for University of Iowa. HF Detectors Readout. Readout Box. IP.  11 m away from IP. Fact: High energetic muons or residues of late hadron showers may reach to HF Readout Box. HF PMT Specs. Hamamatsu R7525 PMT has 8 stages dynode

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PMT Radiation Damage

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  1. PMT Radiation Damage Yasar Onel for University of Iowa

  2. HF Detectors Readout Readout Box IP 11 m away from IP. Fact: High energetic muons or residues of late hadron showers may reach to HF Readout Box.

  3. HF PMT Specs • Hamamatsu R7525 PMT has • 8 stages dynode • 25 mm diameter bialkali photocathode • borosilicate glass window • maximum QE at 450 nm (23%) The glass window can be source of Cerenkov light itself

  4. HF Radiation Environment • Recent radiation background simulations show improvement in the design of the shielding around the PMT region by a factor of ~two. There is no issue with the radiation dose or neutron flux where the PMTs are located. • All neturons 2.54x1012 • Neutrons (E>100KeV) 1.63x1012 • Neutrons (E>20 MeV) 5.12x1011 • Ch. Hadrons 2.26x1010 • Muons 4.65x109 • Photons 1.53x1012 • Dose 7 krad

  5. Neutrons on Glass • PMT window materials (silica and borosilicate) were studied in a reactor and compared with other data • 6 x 1012 n/cm2 • 4.1 x 1013 n/cm2(Hamamatsu points at 14 MeV, red) • 2.5 x 1014 n/cm2(Hamamatsu points at 14 MeV, blue) • 6 x 1014 n/cm2 • Expected total neutron fluence at the PMTs is 2.5 x 1012 n/cm2 in 10 years (E>100 keV 1.6x1012, E>20 MeV 5.1x1011) • Expect transmission loss of a few percent over ten years; • not a problem.

  6. HF MAPS of fluence/dose Fluence of hadrons (E>100 keV) in cm-2 s-1 (upper plot) Radiation dose in Gy (lower plot) in the HF and its surroundings. (Values for 5 105 pb-1)

  7. HF Radiation Environment Erchov, A.: Radiation monitoring in the HF area

  8. All parameters checked at Iowa

  9. UNIVERSITY of IOWA PMT TEST STATION

  10. LabVIEW software

  11. Radiation-hardness measurements of high OH- content quartz fibres at IRRAD

  12. Experimental Setup We investigated the darkening of two high OH_ content quartz fibres irradiated with 24 GeV protons at the Cern PS facility IRRAD. The two tested fibres have a 0.6mm quartz core diameter, one with hard plastic cladding (qp) and the other with quartz cladding (qq). These fibres were exposed at about 1.25 Grad in 3 weeks. The fibres became opaque below 380nm and in the range 580–650 nm. The darkening under irradiation and damage recovery after irradiation as a function of dose and time are similar to what we observed with electrons.

  13. Attenuation Parameters Attenuation parameters wrt the radiation “Radiation-hardness measurements of high OH content quartz fibres irradiated with 24 GeV protons “ Nuclear Instruments and Methods in Physics Research A 585 (2008) 20–27up to 1.25 Grad 15

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