1 / 15

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

tannar
Télécharger la présentation

PMT Radiation Damage

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related