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THGEM: TRIESTE LAB.
EQUIPMENT AND CONTACTS
WITH POSSIBLE PRODUCER
Fulvio Tessarotto
Introduction
THGEM prototypes from ELTOS
Equipping the Trieste Laboratory
Test boxes
Home made amperometers
CERN, 13/02/2008
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GDD Meeting
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Contribution from Trieste
Fulvio TESSAROTTO
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Introduction
The development of MPGD-based photon detectors is considered to be
very 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 complemented
by some work at Trieste home laboratory
CERN, 13/02/2008
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GDD Meeting
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Contribution from Trieste
Fulvio TESSAROTTO
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Introduction
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
CERN, 13/02/2008
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GDD Meeting
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Production of THGEM prototypes
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
CERN, 13/02/2008
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GDD Meeting
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Production of THGEM prototypes
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 6000LZ
6-spindle-roboter
Estimated cost for large number of
holes: ~ 1 euro per 1000 holes
CERN, 13/02/2008
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GDD Meeting
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Contribution from Trieste
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THGEM prototype geometry
Size of active area: 30mm x 30 mm
Thickness: 0.4 mm
Holes diameter: 0.4 mm
Pitch: 0.8 mm diameters
Material: R-1566 Panasonic
(halogen free, anti CAF)
Cu thickness: 35 μm
CERN, 13/02/2008
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GDD Meeting
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Contribution from Trieste
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THGEM prototypes we ordered
We ordered 6 identical pieces for each prototype group,
2 groups without holes for reference measurements and
13 groups with different production characteristics:
1) Single drilling, no etching
2) Double drilling: 0.4 mm + 0.45 mm diam. on one side
only
3) Double drilling: 0.4 mm + 0.50 mm
4) Double drilling: 0.4 mm + 0.60 mm
5) Triple drilling 0.4 mm + 0.50 mm + 0.50 mm on the other
side too
6) Drilling + etching 0.010 mm
7) Drilling + etching 0.025 mm
8) Drilling + etching 0.050 mm
9) Same as 8) with different material (Isola PLC370 HR)
10) Drilling + etching 0.100 mm
11) Drilling + laser photolytic imaging + etching 0.010 mm
12) Drilling + laser photolytic imaging + etching 0.050 mm
13) Drilling + global etching (no protection) 0.010 mm
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Summary table
Nam
eDrilling 0.4 mm
Rim 1 (μm)
Rim 2 (μm)
rim production
material
M1
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
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THGEM test box
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THGEM test box
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THGEM test box
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Signal amplitude spectra
 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
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Multichannel 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
CERN, 13/02/2008
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Anodic current measurement
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
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Home-made Feedback
amperometer
Scheme of principle
10 MΩ feedback resistor (+ parallel capacitor)
CMOS Operational Amplifier: AD 8607
OEM44 Voltmeter: 4.5 digits
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
We are considering alternatives which would allow automatic recording
CERN, 13/02/2008
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GDD Meeting
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Estimate of resolution of the
home-made amperometer
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
CERN, 13/02/2008
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GDD Meeting
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Contribution from Trieste
Fulvio TESSAROTTO
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