thgem: trieste lab. equipment and contacts with possible producer
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Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 11
THGEM:THGEM: TRIESTE LAB. TRIESTE LAB. EQUIPMENT AND CONTACTS EQUIPMENT AND CONTACTS WITH POSSIBLE PRODUCERWITH POSSIBLE PRODUCER
Introduction
THGEM prototypes from ELTOS
Equipping the Trieste Laboratory
Test boxes
Home made amperometers
Fulvio Tessarotto
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 22
IntroductionIntroduction
The development of MPGD-based photon detectors is considered to bevery important by Trieste, Turin and others in the COMPASS RICH group
We believe there is a brilliant future for gaseous PD’s
To start with, THGEM have been selected for this investigation
First studies in 2007: Elena Rocco in MPGD lab at CERN
Elena’s activity will continue for 2008, and will be complementedby some work at Trieste home laboratory
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 33
The aim of this presentation is to give informations about two items:
First contacts with a possible THGEM producer
Activity to equip our laboratory in Trieste for THGEM tests
People involved for 2008:Jaroslav Polak (PHD, ~100%)
Gabriele Giacomini (postdoc, ~100%)Giorgio Menon (~50%)
Fulvio Tessarotto (~50%)
We plan to provide updates whenever meaningful
IntroductionIntroduction
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 44
Production of THGEM Production of THGEM prototypesprototypes
Following indications from Rui de Oliveira we contacted an
Italian producer: ELTOS S.p.A. (Arezzo, Tuscany)http://www.eltos.it/en/main/en-main.htm
They have wide experience in production of pcb’s of all kinds
~90 workers, high tech equipments
We noticed:
modern work organization
willingness to produce special pieces
understanding of our goals
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 55
Production of THGEM Production of THGEM prototypesprototypes
Small diameter holes need high rotation speed of the driller: the multi-spindle machines at ELTOS can reach 180000 turns/min,
allowing hole diameters as narrow as 150 μm.
Nominal drilling tolerance: +- 10 μm
POSALUX ULTRASPEED 6000LZ6-spindle-roboter
Estimated cost for large number of holes: ~ 1 euro per 1000 holes
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 66
THGEM prototype THGEM prototype geometrygeometry
Size of active area: 30mm x 30 mmThickness: 0.4 mmHoles diameter: 0.4 mmPitch: 0.8 mm diametersMaterial: R-1566 Panasonic(halogen free, anti CAF)Cu thickness: 35 μm
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 77
THGEM prototypes we THGEM prototypes we orderedordered
We ordered 6 identical pieces for each prototype group,2 groups without holes for reference measurements and13 groups with different production characteristics:1) Single drilling, no etching2) Double drilling: 0.4 mm + 0.45 mm diam. on one side
only3) Double drilling: 0.4 mm + 0.50 mm4) Double drilling: 0.4 mm + 0.60 mm5) Triple drilling 0.4 mm + 0.50 mm + 0.50 mm on the other
side too6) Drilling + etching 0.010 mm7) Drilling + etching 0.025 mm8) Drilling + etching 0.050 mm9) Same as 8) with different material (Isola PLC370 HR)10) Drilling + etching 0.100 mm11) Drilling + laser photolytic imaging + etching 0.010 mm12) Drilling + laser photolytic imaging + etching 0.050 mm13) Drilling + global etching (no protection) 0.010 mm
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 88
Summary tableSummary tableNam
eDrilling 0.4
mm Rim 1 (μm) Rim 2 (μm) rim production materialM1 Y 0 0 NO Panasonic
M2 Y 25 0 Drilling Panasonic
M3 Y 50 0 Drilling Panasonic
M4 Y 100 0 Drilling Panasonic
M5 Y 50 50 Two Sides Drilling Panasonic
R NO NO NO NO Panasonic
RI NO NO NO NO Isola
C1 Y 10 10 Etching Panasonic
C2 Y 25 25 Etching Panasonic
C3 Y 50 50 Etching Panasonic
C3I Y 50 50 Etching Isola
C4 Y 100 100 Etching Panasonic
C5 Y 10 10 Laser + Etching Panasonic
C6 Y 50 50 Laser + Etching Panasonic
C7 Y 10 10 Laser + Global Etching Panasonic
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 99
THGEM test boxTHGEM test box
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 1010
THGEM test boxTHGEM test box
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 1111
THGEM test boxTHGEM test box
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 1212
Signal amplitude Signal amplitude spectraspectra
Signals formed on the anode will be read out by ORTEC preamplifier 142PC and Research amplifier ORTEC 450. The preamp has noise from 300 e- at 0 pF to 450 e- at 100 pF, rise time of 25 ns at 0 pF to 150 ns at 100 pF The preamp sensitivity is 6.5 V/pC The amplifier has adjustable gain from 2.5 to 3000, shaping time ~1μs
We will use a 55Fe source at start, Ar-CO2 70% - 30% (1 bar) Gains between 10 and 10000 should provide signal amplitudes in the range from 0.2 fC to 200 fC
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 1313
Multichannel analyzerMultichannel analyzer
Amplified signals will be digitized by CAEN N957 multichannel analyzer.13 bit ADC, 800 ns conversion time, internal buffer for 65535 signals computer controlled via C++ libreries, 30 Mb/s USB2 transfer rate
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 1414
Anodic current Anodic current measurementmeasurement
For anodic current we will use a KEITHLEY 6485 picommeter (with 10 fA resolution in the lowest range, up to 1000 readings per sec and drivers for control and data storage (LabVIEW, C++, …) Should not be used above 42 V
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 1515
Home-made Feedback Home-made Feedback amperometeramperometer
This device has been tested to operate at high voltage, powered by batteries.
We plan to use one of these for each voltage line
The cost of the pieces for this device is in the order of 100 euros
Scheme of principle
CMOS Operational Amplifier: AD 8607
10 MΩ feedback resistor (+ parallel capacitor)
OEM44 Voltmeter: 4.5 digits
We are considering alternatives which would allow automatic recording
Fulvio TESSAROTTO CERN, 13/02/2008 - GDD Meeting - Contribution from TriesteCERN, 13/02/2008 - GDD Meeting - Contribution from Trieste 1616
Estimate of resolution of Estimate of resolution of the home-made the home-made amperometeramperometer
Using a current generator: 3V battery + 50 GΩ resistor we checked the Keithley response: 61.43 pA +- 0.23 pA
Providing the same current to the home-made amperometer we obtained: 61.8 pA +- 2.7 pA
In both cases no special shielding was provided
=> We hope to provide < 10 pA resolution in real HV + THGEM set-up
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