Simulation of Conventional and Unconventional Photo- cathode Geometries Valentin Ivanov Muons, Inc. 20 July 2009 Muons, Inc. 1 st Workshop on Photo-cathodes.

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Presentation transcript:

Simulation of Conventional and Unconventional Photo- cathode Geometries Valentin Ivanov Muons, Inc. 20 July 2009 Muons, Inc. 1 st Workshop on Photo-cathodes

20 Jul st Workshop on Photo-cathodes Outline Brief review of numerical toolkit for micro channel plate simulation; Optimization of the photo electron capturing for Funnel MCP; Conventional MCPs with composite secondary emitters; Comparison of emission properties for different analytic models; Future problems; Resume.

20 Jul st Workshop on Photo-cathodes Original software toolkit to simulate the MCPs General purpose 2D electron optical relativistic code “POISSON-2” Micro channel plate simulator MCPS Monte Carlo simulator MCS Secondary electronsPhoto-electrons Electron gun with double grid: Ua=5kV, Ug=0, B=1.5T, I=5.3A

20 Jul st Workshop on Photo-cathodes Part 1. Funnel MCP

20 Jul st Workshop on Photo-cathodes Funnel type MCP (FMCP) Photo cathode Pore Transparent film Optimization of capturing ratio for photo-electrons by varying the outer radius and resistance of photo cathode FMCP is an alternative version of conventional MCP which can prevent the ion feedback damage. FMCP also makes easier the first-strike problem.

20 Jul st Workshop on Photo-cathodes Efficiency of photo emission photons Photo-electrons Equipotential lines The efficiency of photo-electron capturing depends on many factors (funnel geometry, photo-cathode resistance, voltage etc.). It is strongly depends on the position at the cathode surface

20 Jul st Workshop on Photo-cathodes Electron multiplication in the funnel MCP Secondary electrons Photo-electrons Photons The result of numerical simulation for the electron multiplication in 5um pores. Parameters: L/D=40; Material properties: Sigma max=3; Umax=400V.

20 Jul st Workshop on Photo-cathodes Numerical results for FMCP simulation Current distribution of secondary electrons at cross-section Z=20um Angular distribution of photo emission is described by Cos(Theta) dependence

20 Jul st Workshop on Photo-cathodes Part 2. Conventional MCP

20 Jul st Workshop on Photo-cathodes Secondary emission for composite materials These approximations were used in simulation of the INCOM MCP with parameters: D=40um, L/D=40, L=1.6mm, Voltage U=1kV Secondary emission properties for different materials common used as the emitters in MCP The approximations of SEE curve for composite material (30%Al2O3+70%ZnO) used in different semi-analytical models

20 Jul st Workshop on Photo-cathodes Comparison for different Secondary-emission models 1. Guest’s Model 2. Ito’s Model 3. Lie-Dekker Model 4. Agarwal’s Model = = Z is atomic number and A the atomic weight k=0 for textured carbon, 1.5 for polished surface, 2 for crystalline (1 – default); - is an argument value corresponds to the maximum of g n (z), n – is an adjustable parameter (default value is 0.35 for V≤ V max, z m =1.84, g n (z m )=0.725, and 1 for V>3 V max ); θ – incident angle, V – impact energy, V max – impact energy corresponds to a maximum of SEE yield, α – surface absorption factor, β – smooth factor 5. Rodney-Vaugham’s Model = s =0.62 for v 1. is biggest value for SEE curve σ(V 0 )=1

20 Jul st Workshop on Photo-cathodes Comparison for different models (cont.) Courtesy of Z.Insepov

20 Jul st Workshop on Photo-cathodes The results of INCOM MCP simulation MCP parameters: D=40um, L/D=40, L=1.6mm, Voltage U=1kV. Time resolution for the MCP Rt=33.1 ps. Actual resolution with PC-MCP and MCP-anode gaps will be bigger. Different emission models give difference in the gain computation about 30-40%.

20 Jul st Workshop on Photo-cathodes Nearest future plans Extend the field representation in the pores to take into account the tilted electric field in chevron-pair plates which can substantially increase the gain; Incorporate the saturation model to our numerical codes; Provide systematic comparison for emission models with experimental data.

20 Jul st Workshop on Photo-cathodes Resume Numerical optimization of funnel MCP parameters substantially increased the capturing of photo-electrons and total gain factor; Simulation of conventional MCP with secondary emitter of composite material detects a big difference in the gain factor for different analytical models; Existing numerical codes should be improved to satisfy the main requirements in simulation of modern MCP photo-detectors.