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Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 11
UPDATEUPDATE ON TRIESTE ON TRIESTE LAB. ACTIVITYLAB. ACTIVITY
The set-up to measure currents
THGEM prototypes from ELTOS
First measurements on 4 pieces
Chamber for prototype test
The set-up to measure signals
Fulvio Tessarotto
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 22
The HV power supplyThe HV power supply
We used for this measurement one channel of the
CAEN N471A power supply, reading the voltage from
the LED display ( +- 1 V ) and the current from the
“current monitor” output (5 mV offset, 1 mV/nA)
We checked the stability of the power supply by looking
at signals on the HV output, using a HV cable, a 1 nF
capacitor and Le Croy oscilloscope
Typical ripple has ~ 30 μs period, 80 mV pp at HV=4kV,
the ripple amplitude being roughly linear with voltage
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 33
Ripple on the oscilloscopeRipple on the oscilloscope
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 44
HV – Power Supply: Ripples
HV= 2kV
HV= 4kV
Power Supply
HV cable
1nF
LEMOcableSCOPE
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 55
HV – Power Supply: Ripples
Receiving a phone call
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 66
Home-made Home-made picoamperometerpicoamperometer
Implemented scheme
CMOS Operational Amplifier: AD 8607
10 MΩ feedback resistor: VISHAY CNS020 (+- 0.02%, +- 10 ppm/ºC)
1 nF to 100 nF feedback capacitor
10 M protection resistor
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 77
The home-made The home-made picoammeterspicoammeters
Several temporary arrangements were tested for the home-made picoamperometers, using solderless breadboard, micro pcb on ceramic insulators and customly designed pcb’s for home-made picomaperometers
- When powered by batteries they work fine at HV (tested up to 8kV), with stable offsets <10 pA
- Using a battery + resistor current source of ~60 pA we checked that the reading was correct at few pA level; the ultimate resolution is still to be determined
At ground, the agreement between Keithley measurements and home-made picoammeters values is roughly 1pA
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 88
CMOS Operational Amplifier: AD 8607
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 99
First tests of the set-upFirst tests of the set-up
1) PS – cable1 – PA – cable2
Oscillations with amplitudes proportional to L x V (cable length x PS voltage; no oscillations with PS off).
2) PS – cable1 – PA1 – cable2 – THGEM – cable3 – PA2
Oscillations are the same on PA1 and PA2
Decision: redundancy, shortest possible cables,
design final set-up but start measurements before it is ready
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1010
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1111
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1212
What we observed
Power Supply
Box with ThickGEM – no holes
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1313
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1414
Reading the voltmetersReading the voltmeters
We decided to register picoammeter redings by saving pictures of the displays
CANON Camera programmed to shoot every 2 seconds: this allows registering measurements and all intermediate operations done by humans
From picture analysis the images on LED displays are translated into numbers (~ 40000 pictures so far)
This solution avoids electrical connections to the acquisition system
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1515
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1616
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, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1717
Summary tableSummary table
NameDrilling 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 Global Etching Panasonic
We received 10 samples per type
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1818
Documentation example Documentation example C3C3
FASE DI LAVORAZIONE
QUADROTTO ELTOS = 0.38 35/35 320 X 375MATERIALE PANASONIC R-1566 HF
STABILIZZARE INNER 140° 4 ORE
PRIMA FORATURA ( SOLO FORI DI SERVIZIO)AGGIUNGERE LA SCRITTA C3 SUL BORDO
STAMPA ESTERNI INCISIONE INDIRETTAAGGIUNGERE LA SCRITTA C3 SUI CS
SECONDA GALVANICA ( SOLO STAGNO )STRIPPAGGIO RISTON
INCISIONE AMONIACALE RAME 35µ
NON STRIPPARE STAGNO
FORATURA PASSANTE ( DIAMETRO 0.4 )
INCISIONE AMONIACALE RAME 35µINCIDERE USANDO LA VELOCITA ADEGUATA IN MODO DA CREARE UN ISOLAMENTO DI 50µ
INTORNO ALLA CORONA DEL FORO
STRIPPARE STAGNO
SCONTORNATURA
LAVAGGIO CIRCUITI AD ULTRASUONI IN ACQUA DEMINERALIZZATA
IMBALLO E SPEDIZIONE
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 1919
TheThe
FR4 FR4
materialmaterial
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2020
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Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2222
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Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2424
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2525
ProcedureProcedure
THGEM prototypes are kept under vacuum before and after measurement
Handling is done with polyethylene gloves only
Mounting at the centre of the test box, soldering cables and screwing nylon screws on ~5 cm nylon columns: ~ 10 min
HV provided to “TOP” of THGEM prototype, “BOTTOM” at ground (some field above while no field below THGEM)
Flushing with N2 at ~20 l/h for more than 3 hours before switching HV on
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2626
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2727
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2828
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 2929
Maximum Maximum voltage in voltage in
NN22 Vmax: highest value of HV
which has been applied for more than 3 min without discharges.
V maxtype rim sample I sample II
50µm (TOP)
M5 50µm (BOTTOM) 2590 V 2400 V
no
M1 -test 1 no 2200 V 2000 V
M1 -test 2 2300 V 2120 V
50µm
C3 50µm 2050 V 1700 V
E1 -test 1 no 2600 V
E1 -test 2 no 2650 V
50µm
M4 0µm 2100 V
0µm
M4 50µm 2270 V
100µm
C4 100µm 3370 V
Preliminary conclusions:
C3 seems to be the worst (50 μm)
C4 seems to be the best (100 μm)
E1 and M5 are very good
M1 and M4 are similar
Reversing M4 rim makes a difference
We provide negative voltage to the “top” of the THGEM
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3030
We are building a more compact set-up
Box for 4 THINGS- HV connectors will be on the back side
PCB
OEM44 voltmeter
Connectors for batteriesResistor (10Mohm)Capacitor (10nF)OA - AD8607Guarding “ring”Connectors for OEM44 voltmeter
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3131
Test of analog r/o chainTest of analog r/o chain
Single photon signals are generated by a picosecond laser providing ~20 ps long pulses and a correlated timing signalLaser amplitudes are reduced by geometric selection and laser tune down to a probability of 95% no photon pulses. One pixel of a Hamamtsu R7600-03-M16 MAPMT is used to provide signal to our analog r/o chain through a resistive divider (reducing the signal by a factor 4).The ORTEC 142 preamp coupled to the ORTEC 450 amplifier and the CAEN N957 was used to collect amplitude spectra a rough calibration was performed for several gain factors, showing evidence of non linearities for large signals: only signals in the linear range have been used Spectra were taken at various gains and combined in a single plot to increase the dynamic range of the measurement
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3232
Single photon amplitude spectra from Single photon amplitude spectra from MAPMTMAPMT
825 V
0
500
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0 1 2 3 4 5V out from preamp
cou
nts
850 V
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0 1 2 3 4 5V out preamp
co
un
ts
875 V
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cou
nts
900 V
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0 1 2 3 4 5
V out from preamplifier
coun
ts
925 V
0
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0 1 2 3 4 5V out from preamplifier
co
un
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Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3333
THGEM test THGEM test chamberchamber
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3434
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3535
Very first spectrum of THGEM Very first spectrum of THGEM signals from Fe source seen signals from Fe source seen
in TSin TS
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3636
Fulvio TESSAROTTO CERN, 23/04/2008 - Contribution from TriesteCERN, 23/04/2008 - Contribution from Trieste 3737