1 / 11

マイクロメッシュを用いた 三次元電場構造型 μ-PIC の開発

マイクロメッシュを用いた 三次元電場構造型 μ-PIC の開発. 神戸大学　　越智 敦彦、本間康浩、桂華 智裕、 　　　　　　　　故島陽太、守谷健司、道前武. 1. Introduction 2. Test operation of prototype 3. Summary. 日本物理学会 2007 年春季大会　 26 Mar. 2007. Introduction. Mesh. 400 m m. Micro pixel chamber ( m -PIC) Position resolution ( - 100 m m)

brent-workman
Download Presentation

マイクロメッシュを用いた 三次元電場構造型 μ-PIC の開発

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. マイクロメッシュを用いた三次元電場構造型μ-PICの開発マイクロメッシュを用いた三次元電場構造型μ-PICの開発 神戸大学　　越智 敦彦、本間康浩、桂華 智裕、 　　　　　　　　故島陽太、守谷健司、道前武 1. Introduction 2. Test operation of prototype 3. Summary 日本物理学会2007年春季大会　26 Mar. 2007

  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 willbe attained safely • 104-5 • Reduction of positive ion distribution across detection volume • ~ 1% (simulation)

  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 • No gating method needed

  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 mounted on m-PIC by hand. Size of m-PIC = 3cm x 3cm. Efficient area using mesh = 2mm x 3cm

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

  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 • Gain of 2 x 104 were attained • With prototype mesh (distance is about 300mm) • More studies are needed for tuning up the parameters • Simulation studies  Keika will talk

  11. Future prospects • How to hold the mesh on detector? • How to keep the flatness of the mesh? • Wire or leg? • Insulations are attached with micro mesh or m-PIC? • Optimization of geometries and operation voltage? • Collection efficiency ↑and gas gain　↑ • To get consistency of simulation and measurement • 2 dimensional readout and larger detection area • With amplifiers and data acquisition system • We have to get the budget for this project !!! • There is no budget about this project yet !! • We need more than 5M JPY to make new design of m-PIC

More Related