Update on Foils (in SBND and DUNE) Andrzej Szelc (University of Manchester)
This Talk ● You've just heard about updates to the simulation of scintillation light in DUNE and SBND. ● This talk will give a quick update on the hardware side: – towards foil installation in SBND. – status in DUNE. 06/03/19 A. M. Szelc @ DUNE UK 2
Foils in SBND ● Wavelength-shifter covered reflector foils placed on the cathode will improve uniformity and light collection efficiency. ● UK-proposed and led activity. ● Production of components now complete. ● Installation in CPA in the APPROVED spring. 06/03/19 A. M. Szelc @ DUNE UK 3
Foils • 0.032” (~0.8 mm) thick FR4 (resin- impregnated fibreglass) • The reflector foils are produced by laminating 3M DF2000MA (~99% reflectivity) onto both sides of the FR4 (38 μm). • 64 plates are required (4 per CPA window). • TPB Evaporations split between Manchester and Brazil. • Principle: TPB wavelength-shifts VUV light, which is then reflected and can be detected by PMTs. Stolen from V. Basque SBND talk. 06/03/19 A. M. Szelc @ DUNE UK 4 4
First foil! V. Basque August 2018 06/03/19 A. M. Szelc @ DUNE UK 5 5
Feb/March 2019 50 foils Feb 2019 31 foils In total, the foil will have accumulated over 24000 miles points! V. Basque 06/03/19 A. M. Szelc @ DUNE UK 6 6
UK foil making team 06/03/19 A. M. Szelc @ DUNE UK 7
Towards DUNE ● The main questions are: – Compatibility with the HV system. – Sensitivity of light detectors (ARAPUCA/X- ARAPUCA) to visible light. – Need to understand engineering and installation procedures (work being performed by the HV consortium). Surface resistivity also ridiculously high. (Y. Ramachers, Warwick) Clark Griffith, Sussex 06/03/19 A. M. Szelc @ DUNE UK 8
Towards DUNE ● The main questions are: – Compatibility with the HV system. – Sensitivity of light detectors (ARAPUCA/X- ARAPUCA) to visible light. – Need to understand engineering and installation procedures (work being performed by the HV consortium). Surface resistivity also ridiculously high. (Y. Ramachers, Warwick) Clark Griffith, Sussex
How to mount foils on the CPA • The goal is to minimize the impact on the CPA construction. The reflector foils could be implemented post CPA production. • Current solution is to maintain the current CPA design, and include a set of attachment holes on each CPA resistive panel to allow the installation of reflector foils in smaller tiles on both sides of the CPA surfaces in the UG cleanroom. From Bo Yu, Potential distribution on a and Francesco 1cm square cell with 5mm Pietropaolo hole. The maximum voltage at the corners of the cell is 290V. 10 06/03/19 A. M. Szelc @ DUNE UK 10
Effect of foils Assuming 2.5% ARAPUCA efficiency. Applying measured transmittance of TPB coated glass Keeping 50% of detectors not covered in WLS to improve uniformity. (not best case scenario) Assuming 80% cathode coverage (potentially conservative) O. Bazavan, V. Griguta, Manchester 06/03/19 A. M. Szelc @ DUNE UK 11
Tests at CERN test stand (Foil – CPA, HV Compatibility) ● First run of CERN 50 l dewar in December with full non-perforated foil. ● Look for discharges and space-charge effects. ● Plan to repeat with perforated foil and PEN soon. CPA plate with Glued on Reflective foil. 06/03/19 A. M. Szelc @ DUNE UK 12
Preliminary Results P. Green B. Bilki 06/03/19 A. M. Szelc @ DUNE UK 13
Conclusions ● SBND foil production complete. Installation in a few months. ● Foils on cathode are one of the options considered by the DUNE PDS consortium (photon collection boosters) and are in TDR. ● UK groups involved in DUNE PD Consortium: Edinburgh, Manchester, Sussex, Warwick. ● R&D to develop mounting method in DUNE ongoing. ● Lots of places to get involved. 06/03/19 A. M. Szelc @ DUNE UK 14
Save the date, Details coming soon. LIDINE 2019 Manchester, UK 28-30, Aug, 19 Light Detection in Noble Elements 06/03/19 A.M. Szelc, UK-LA Workshop, Campinas 15
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