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HMPID Project

HMPID Project. Assembly & Tests of CsI QE monitors: VUV-scanner and ASSET Milestone: December 2002. VUV Scanner

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HMPID Project

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  1. HMPID Project Assembly & Tests of CsI QE monitors: VUV-scanner and ASSET Milestone: December 2002

  2. VUV Scanner • System for “in-situ” quality control of large area CsI photocathodes (PCs) immediately after the deposition: scanning measurement of the photocurrent produced illuminating PCs with a collimated light beam from a VUV deuterium source; • concept, design, drawings, production: done • assembly & tests: done • ASSET (“ASmall Sample Evaporation and Test facility”) • R&D setup: • Characterization of small samples of CsI films • absolute QE evaluation with a VUV monochromator of resolution of ~4 nm. The monochromator system was designed to be compatible with the UV-system of the VUV-scanner (i.e. allow both UV-systems to be interchangeable): done • assembly and tests: done

  3.  Monitoring: - RGA - Temperatures - Pressures - CsI deposition rates - Witness samples - VUV scanner (rel. QE) • Layout of the CERN/HMPID CsI deposition plant & VUV scanner

  4. Auto CAD drawings: Pad cathode mounted on rails VUV scanner mounted on rails Reference PM Protective box 4 CsI sources (in series)

  5. (relative Quantum Efficiency determination) Production/assembly/tests

  6. Before … Now: Multiplexer PicoAmmeter D2-lamp All scanning motions and photo-current readout-electronics are equipped with a remote control (NIDAQ/LabView) Turbo pump Optics Primary vac.pump Inside evaporator 

  7. VUV Scanner platform inside: PC ‘trolley Anode ring & Cathode ring & gnd shield Vacuum feed through (4x) Rotating Mirror Horizontal alignment of mirror and anode Vertical alignment of Ref.PM and anode Ref.PM & housing

  8. - 5 0 155 5 150 145 Optical alignment with laser (e.g. red spot) • Tests, e.g.: • remote control X,Y motion (scan), • PicoAmp.-readout • incident UV-spot scan with photo-diode

  9. ASSET:ASmall Sample Evaporation and Test facility Previous layout/concept: relative QE determination implicit test for VUV-scanner application: OK P< 10-5mbar sample holder for 2 samples (18x18mm2) Ref.PM (CsTe) picoAm.2 S1 S2 picoAm.1 evaporation chamber UV test chamber anode grid UV source 4 interferential filters on rotary disk: relative QE UV light spot of   5mm ASSET upgrade with UV-monochromator: absolute QE measurements 

  10. UV test chamber Upgrade concept & design (compatible with VUVscanner optics) Ref PM Sample holder Deuterium lamp with quartz exit-window anode grid monochromator box (leak- & light-tight) diaphragm output Argon UV-mirror input Argon MgF2 lens & x-y micro-control lens holder

  11. Upgraded setup is ready System test: Deuterium Lamp spectrum D2-peak at l=160 nm is being cut off by the quartz exit window of the D2-lamp I [pA] l [nm]

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