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  • Comparison between a THGEM made of ARLON and a ...A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6 Variacon of resolucon at each region n 0 0.105 0.21 0.315 0.42 A1 A2 A3 A4 A5
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RD51 Collaboration Meeting Comparison between a THGEM made of ARLON and a traditional THGEM made of FR4 1 INFN, Trieste - ICTP, Trieste Jinky Agarwala Tuesday, September 27, 2017

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  • RD51CollaborationMeeting

    ComparisonbetweenaTHGEMmadeofARLONandatraditionalTHGEM

    madeofFR4

    1

    INFN,Trieste-ICTP,Trieste

    JinkyAgarwala

    Tuesday,September27,2017

  • RD51CollaborationMeeting 2

    • ARLONandFR4THGEMs• Setupandconditionsofthemeasurements• Comparisonofresults• Effectofx-rayillumination• PreviouscharacterizationofaTHGEMmadeofPermaglass

    • Conclusions

    Outlines

    Tuesday,September27,2017

  • RD51CollaborationMeeting 3

    ARLONandFR4THGEMs

    Area:(300x300)sq.mmThicknessofthepiece:0.4mmPitch:0.8mmHolediameter:0.4mmNoRim

    ARLON25FRDielectricconstant:3.58

    Ceramic-filledfiberglassmaterial

    FiberglassFR4Dielectricconstant:4.7

    Wovenfiberglassandepoxyresin

    Tuesday,September27,2017

    BothproducedbyELTOS

  • RD51CollaborationMeeting 4

    TheReadoutPads(Anode):•24x24matrix•Dividedinto18regions•Eachregionhas32(4x8)padsreadtogether

    GasUsed:Ar:CO2=70:30

    HVPS:CAENN1471HSoftwareforHVPS:GECO2020PreAmplifier:CREMAT110Amplifier:Ortec672MCA:AMPTEK8000A

    Source:55Fe(5.9keV)Rate:5kHz

    Tuesday,September27,2017

    Multi-Pad Anode (12mm X 12mm)

    Thickness:0.4mm

    KAPTONDrift

    17.5mm

    2.5mm

  • RD51CollaborationMeetingTuesday,September27,2017 5

    ARLON:DriN_SCAN

    Eff.G

    ain

    130

    135

    140

    145

    150

    E_Din[kV/cm]

    0.2 0.4 0.6 0.8 1

    FR4:InducZon_Scan

    Eff.G

    ain

    0

    55

    110

    165

    220

    E_I[kV/cm]

    0 1 2 3 4

    ARLON:InducZon_SCAN

    Eff.Gain

    0

    50

    100

    150

    200

    E_Iin[kV/cm]

    0 1 2 3 4

    Measurements:DriftScansandInductionScans

    Similarresponses

  • RD51CollaborationMeetingTuesday,September27,2017 6

    EffectiveGain

    Verysimilareffectivegains

    Vc 889V

    |Ec| 22.2kV/cm

    ΔV10 178V

    |ΔE10| 4.45kV/cm

    Vc 902V

    |Ec| 22.6kV/cm

    ΔV10 192V

    |ΔE10| 4.8kV/cm

    ARLON

    FR4E_Ind=2kV/cm,E_D=0.8kV/cm

    EffecZveGainVsΔV

    Eff.G

    ain

    10

    100

    1000

    DeltaVinVolts1100 1175 1250 1325 1400ARLON FR4

    y=aebxa=1.906x10-5b=1.256x10-2

    y=aebxa=1.209x10-5b=1.294x10-2

  • RD51CollaborationMeeting 7

    EnergyResolution

    Calibrationfactor:1.048228231electronsperchannel,27channels/fC

    Tuesday,September27,2017

    EnergyResolution:11.9%

    ARLON FR4

    EnergyResolution:12.2%

    TheyhavethesameEnergyResolution

  • RD51CollaborationMeetingTuesday,September27,2017 8

    Effectivegainvariationwithtime

    ARLON FR4

    8h

    60h

    Gainvariationswithtimeforthetwopiecesarenotthesame

  • RD51CollaborationMeetingTuesday,September27,2017 9

    CorrelationbetweeneffectivegainandP/T

    CorrectionFactor(C):1+0.00151X{(P/T)-(P_0/T_0)}Correctionisappliedif:0.01<|1-C|<0.001ThisrecipeisusedbyCOMPASSRICH-1hybriddetectors

    LabviewHVcontrolprogramwithP,Tcorrections

    HVbiasmodifiedtocompensateforPandTvariations

  • RD51CollaborationMeeting 10

    GainstabilizationwithHVcorrections

    Tuesday,September27,2017

    Variationwithin+(-)2.5%

  • RD51CollaborationMeetingTuesday,September27,2017 11

    GainUniformityARLON FR4

    σ=9.1% σ=16.1%

  • 12

    Effect of illumination by 55Fe source

    Variaconofeff.gainateachregion

    Eff.G

    ain

    0

    70

    140

    210

    280

    A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6

    Variaconofresoluconateachregion

    Resoluco

    n

    0

    0.105

    0.21

    0.315

    0.42

    A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6

    Broadeningofthespectra

    UniformityscanperformedafterA6wasilluminatedfor5hours

    Eff.Gain

    Eff.G

    ain

    0

    75

    150

    225

    300

    PosiZonoftheSource

    A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6

    ResoluZon

    FWHM

    /Mean

    0

    0.125

    0.25

    0.375

    0.5

    PosiZonoftheSource

    A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6

    UniformityscanperformedafterA4wasilluminatedfor67hours

  • RD51CollaborationMeetingTuesday,September27,2017 13

    LongtermpersistenceoftheilluminationeffectonARLONandFR4

    08-Sept11-Sept13-Sept15-Sept18-Sept

    10DAYS

    26-Jun21-July24-July01-Aug09-Aug06-Sept08-Sept

    70DAYS

    ARLON FR4

    A3 A4 A6 C4A6 C3 C6 A1

  • RD51CollaborationMeetingTuesday,September27,2017 14

    • TheresponsesofidenticalTHGEMsmadeofARLONandFR4havebeencompared

    • Thegainandtheenergyresolutionarethesame• ThechargingupisfasterinFR4• TherecoveryfromtheilluminationeffectismuchslowerinARLON

    • TheARLONmaterialisnotsuitableforhighrateTHGEMapplication

    Conclusions

  • GAS DETECTORS

    15

    About PERMAGLAS

    • Permaglas ME730 by RESARM Engineering Plastics SA

    ▪ Epoxy glass fibre material, amorphous, machinable

    ▪ The plate planarity is obtained by machining Purchased by us:

  • GAS DETECTORS

    16

    THICKNESS UNIFORMITY

    • Raw material characterization

    • Nominal thickness 0.7 mm ▪ /Δ/ < 4%; σ < 2%

    • Nominal thickness 1 mm ▪ /Δ/ < 2%; σ < 1%

    à Very good thickness uniformity!

    Cu layers glued at CERN by Rui de Oliveira

    Drilling performed by ELTOS

  • GAS DETECTORS

    17

    ELECTROSTATIC PROPERTIES

    PASCHEN test for 1mm thick piece

    90% PASCHEN limit

  • GAS DETECTORS

    18

    RESULTS

    • UNIFORMITY SCAN: ▪ σ: 13%

    • ENERGY RESOLUTION: ▪ 20 %

    • GAIN PERFORMANCE: ▪ A robust device

    Gas: Ar:CO2= 70:30

    Source: 55Fe

  • GAS DETECTORS

    19

    TIME DEPENDENT EFFECTS

    CHARGING UP STUDIES

    Effect of the ion motion in the material

  • GAS DETECTORS

    20

    CONCLUSIONS about PERMAGLAS THGEM

    • Robust material with good uniformity performance

    • Difficult to get good quality thin foils

    • Limited gain dependence on rate (charging up) and time (ion displacement in the bulk dielectric)

  • RD51CollaborationMeetingTuesday,September27,2017 21

    ThankYou


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