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マイクロメッシュを用いた 高増幅率型 μ-PIC の開発 Development of m -PIC using micro mesh

マイクロメッシュを用いた 高増幅率型 μ-PIC の開発 Development of m -PIC using micro mesh. 神戸大学　　越智 敦彦、桂華 智裕. 1. Introduction 2. Test operation of prototype 3. Simulation studies 4. Summary. Kobe Univ. Atsuhiko Ochi, Tomohiro Keika. Introduction. Mesh. 400 m m. Micro pixel chamber ( m -PIC)

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マイクロメッシュを用いた 高増幅率型 μ-PIC の開発 Development of m -PIC using micro mesh

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  1. マイクロメッシュを用いた高増幅率型μ-PICの開発Development of m-PICusing micro mesh 神戸大学　　越智 敦彦、桂華 智裕 1. Introduction 2. Test operation of prototype 3. Simulation studies 4. Summary Kobe Univ. Atsuhiko Ochi, Tomohiro Keika

  2. Introduction Mesh 400mm • Micro pixel chamber (m-PIC) • Position resolution ( - 100mm) • Timing resolution ( < 100ns) • High rate capability ( > 107c/sec/mm2) • With micro mesh • Higher gain in stable operation (>104)

  3. Effect using micro mesh • Higher Electric field around the anode • Vertical direction against detection flat • Without increase of e-field near cathode edge •  Higher gas gain will attain safely • Reduction of positive ion distribution across detection volume

  4. Applications • Replacement of m-PIC with GEM • Real time imaging device for • X-ray • Gamma-ray • Charged particle • Neutron • etc. • TPC • Low ion diffuse

  5. Prototype test • Micro mesh was mounted on m-PIC • Supported by plastic film / nylon wire • Support structure is future tasks • Distance between m-PIC and wire • About 300mm • Micro mesh is connected to HV controller • Operation gas • Ar:C2H6 = 90:10

  6. Micro scope pictures for same place (different focus point) 0.5mm Micro mesh mount on m-PIC by hand. Size of m-PIC = 3cm x 3cm. Efficient area using mesh = 2mm x 3cm

  7. 信号 Test parameters • Only signal pulses (gain) were measured • Gain dependency on • Anode voltage (=Va) • Mesh voltage (=Vm) • Drift voltage (=Vd) Drift Plane Vd Mesh Vm 10mm Cathode 100mm 10mm Anode Va

  8. Gain curve (Va, Vm dependence) Gain • Vd-Vm = 100V (Vd=2kV for no mesh plot) • Gas: Ar(90%)+C2H5(10%) • Source: Fe55 (5.9kV) Va [V]

  9. Collection efficiency problem • Collection efficiencies for electrons • Depend on Vd-Vm … smaller is better Gain Gain Va=450V Va=450V Without Mesh With mesh (Vm=0V) Vd [V] Vd [V]

  10. Current status of development • Came up with the new idea • m-PIC with micro mesh • Prototypes were made and tested • Gas multiplicity of it is more than 3 times • More studies are needed for tuning up the parameters • Simulation studies  Keika will talk • There are many issue to study • How to hold the mesh on detector? • Optimization of geometries and operation voltage? • 2 dimensional readout and larger detection area • We have to get the budget for this project !!! • There is no budget about this project yet !!

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