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足付き GEM / GEM 付き micromegas. 佐賀大学 大学院工学系研究科物理学専攻 1年 青座 篤史. Good point of GEM. Good point of micromegas. Gain is large. Easy to handle. Danger of damaging RO electronics is a little. Diffusion at the gas amplification is small. Weak point of GEM. Weak point of micromegas. - PowerPoint PPT Presentation

Transcript of 足» GEM ï¼ GEM » micromegas

  • GEMGEMmicromegas

  • Goodpoint of GEMThe frame becomes a dead space.Good point of micromegasDiffusion at the gas amplification is largeGain is largeGain is smallWeak point of GEMWeak point of micromegasThe frame is necessarydischargeDamage to RO electronics.Easy to handleMulti-layer structureDiffusion at the gas amplification is smallDanger of damaging RO electronics is a little.

  • GEM+micromegasGEMStructure to combine GEM with micromegasGEM+micromegasgas amplification areaGain is largeThe danger of the electrical discharge is reduced. amplification areaThe amplification area is kept away from the reading part. The frame is unnecessary.

  • micromegasOperation test in airThere were a lot of electrical discharges in a low potential difference(250V280V. 50

  • Result of electric field calculation by Maxwell3DIt is a high electric field in the place where the insulator is near Pad.The insulator should be vertical to Pad.

  • micromegassetupED100[V/cm]PadFe555.9keVPad3.01cmPad100micromegasGasP1095C4H10515mThe same method as saclay group

  • Operation test of micromegas(meshP1095C4H105440V

  • GEM+micromegasGEMGEM1010

  • Operation testEd100[V/cm]VGEM250[V]Pad~GEM250[V]SetupGasP-10Ar90%CH410%

  • Operation testIt measures it by using six Pad.

  • Operation testSetupPadEd100[V/cm]VGEM 320[V]Pad~GEM190240[V]GasP-10Ar90%CH410%

  • PadGEM240VPadGEM230VPadGEM220VPadGEM210VPadGEM200VPadGEM190V55Fe

  • ArCH4=8020ArCH4=7030ArCH4=6040ArCH4=5050ArCH4=4060ArCH4=3070ArCH4=2080The mixture ratio of the gas was changed. ArCH4=0100ArCH4=9010ArCH4=955

  • GEM1GEMresolution0.13resolution0.10Ed100[V/cm]VGEM320[V]Pad~GEM210[V]GasP-10Ar90%CH410%Result of measurement

  • SummaryGain is large was able to be confirmed.no reproducibility. GEMmicromegasGEMPad

  • Question concerning GarfieldIONFEEDBACKAvalanchelossesFeedbackGEMGATEion

  • Question concerning GarfieldQ2/Q11VGEMholeGASGarfieldQ2/Q1

  • step sizeInterval when position of electron is updated

    Step size is specified by the number of collisions and length. Question concerning GarfieldThe calculations are stopped if the number of step reaches the maximum number of steps allowedIt reaches the maximum number of steps before the particle reaches the electrode if the step size is too small. If the steps are too large, the method is inaccurate.1000

  • lengthQuestion concerning Garfieldextraction efficiencyextraction efficiencycollection efficiencycollection efficiencyNumber of collisions

  • GASEFFECTMeasurement by Saulisimulation

  • HOLEDIAMETEREFFECTMeasurement by Saulisimulation