è¶³» GEM ï¼ GEM » micromegas
Embed Size (px)
Transcript of è¶³» GEM ï¼ GEM » micromegas
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
Operation testIt measures it by using six Pad.
Operation testSetupPadEd100[V/cm]VGEM 320[V]Pad~GEM190240[V]GasP-10Ar90%CH410%
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