thgem: prototype device

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 11

THGEM:THGEM: PROTOTYPE PROTOTYPE DEVICEDEVICE

Design of the first prototype

Production of THGEM foils

The prototype assembly

Tests in the laboratory

Test in the COMPASS beam

Fulvio Tessarotto

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 22

Drawings of the first Drawings of the first prototypeprototype

We started from the design of the prototype structure andthe mechanics of its test box

The prototype test box contains:a quartz radiator

a wire cathode framethe THGEMs and spacer framesa segmented collection anode pcb

We hope to perform the test of the first prototype using muons of the COMPASS beam or halo and a quartz radiator to generate Cherenkov photons.

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 33

THE PROTOTYPE THE PROTOTYPE STRUCTURE STRUCTURE

wireswires

11stst THGEM (CsI THGEM (CsI here,external here,external face)face)

22ndnd THGEM THGEM

collection anodecollection anode

apertures for gas apertures for gas circulationcirculation

read-outread-out

Quartz radiator(truncated cone)

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Photon DetectorsPhoton Detectors

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 1616

THGEM production for the THGEM production for the prototypeprototype

following the preliminary indications coming from the laboratory tests, the geometrical parameters of our first

THGEM prototype have been defined:

Thickness: 0.20 mm

Holes diameter: 0.20 mm

Pitch: 0.50 mm

Material: fiberglass + 17 μm thick Cu

Active area: 10 cm х 10 cm

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 1717

Raw material

CNC drilling

Electrodes etching

Rim if needed

Resist covering

THGEM production process

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 1818

10 cm x 10 cm THGEM

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 1919

THGEM: HV connections

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THGEM: edge and holes

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THGEM: edge and holes

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THGEM: edge and holes

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 2323

THGEM: holes

0.2 mm

0.5 mm

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 2424

Anode with 256 padsAnode with 256 pads

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 2525

Anode pcb, connector Anode pcb, connector sideside

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 2626

Anode pcb, glued on Anode pcb, glued on Al frameAl frame

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 2727

Anode pcb, glued on Al frame, with smd

connectors

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 2828

Read-out for the initial Read-out for the initial tests:tests:

as for the MAPMTsas for the MAPMTs

Replacing the cover with Replacing the cover with the quartz radiator with a the quartz radiator with a mylar/aclar foil: test the mylar/aclar foil: test the device as ionizing particle device as ionizing particle detectordetector

Initial test configurationInitial test configuration

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 2929

PLANNINGPLANNING

Lab tests, no CsILab tests, no CsI Beam tests, no CsIBeam tests, no CsI

Trigger prepared in 888, at the end of the hall, to trigger on halo (or beam) mu’s

If possible, apply CsI on the If possible, apply CsI on the external surface of the first external surface of the first THGEM THGEM

Test with quartz radiator !Test with quartz radiator !

Fulvio TESSAROTTO CERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH sessionCERN, 14/09/2007 - COMPASS Collaboration Meeting - RICH session 3030

A. Braem CsI A. Braem CsI evaporation plantevaporation plant