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Forum: Processes Involving Optical Photons
Re: Question Help on Teflon Reflection needed (Aiwu Zhang)
Re: None Re: Help on Teflon Reflection needed (Angus HOLLANDS)
Date: 07 Dec, 2017
From: Aiwu Zhang <Aiwu Zhang>

Hi Angus, Thanks for replying to my question.

I now simplified the study by using only one layer teflon (0.2 mm) in the air, then I hit the material with optical photon (3 eV, eg.) and try to visually see if the reflection make any sense.

I tested some combinations of optical properties, but at the best situation I could only see very small probability (<10%) of reflection (What I want is 100% reflection).

A complete list of the properties is below, I tried to remove some, or to change the values, but nothing would work as I want (I also attached a picture showing the process, in which the blue traces indicate the optical photon paths, I run 10 events and occasionally I could see one reflection).

Could you tell me where I did wrong? Thank you!

{ name: "OPTICS",

index: "ptfe_fabric", // Gore DRP Diffuse Reflector (ePTFE)

surface: 1,

finish: "groundfrontpainted",

model: "glisur",

type: "dielectric_metal",//sigmaalpha: 0.5,// polish: 1.1,//

REFLECTIVITY_option: "wavelength",

REFLECTIVITY_value1: [60.0, 100.0, 200.0, 400.0, 800.0, 1200.0, ],

REFLECTIVITY_value2: [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, ],//REFLECTIVITY_value2: [1.0, 1.0, 0.95, 0.993, 0.993, 0.993, ],

ABSLENGTH_option: "wavelength",

ABSLENGTH_value1: [200.0, 800.0, ],

ABSLENGTH_value2: [100.0, 100.0, ],//ABSLENGTH_value2: [0.001, 0.001, ],

SPECULARSPIKECONSTANT_option: "wavelength",

SPECULARSPIKECONSTANT_value1:[60.0, 100.0, 200.0, 400.0, 800.0, 1200.0, ],

SPECULARLOBECONSTANT_value2:[0.99, 0.99, 0.99, 0.99, 0.99, 0.99],

SPECULARLOBECONSTANT_option: "wavelength",

SPECULARLOBECONSTANT_value1:[60.0, 100.0, 200.0, 400.0, 800.0, 1200.0, ],

SPECULARSPIKECONSTANT_value2:[0.01, 0.01, 0.01, 0.01, 0.01, 0.01],

BACKSCATTERCONSTANT_option: "wavelength",

BACKSCATTERCONSTANT_value1:[60.0, 100.0, 200.0, 400.0, 800.0, 1200.0, ],

BACKSCATTERCONSTANT_value2:[0., 0., 0., 0., 0., 0.],

EFFICIENCY_option: "wavelength",

EFFICIENCY_value1: [200.0, 800.0],

EFFICIENCY_value2: [1.0, 1.0],

RINDEX_option: "wavelength",

RINDEX_value1: [60.0, 200.0, 300.0, 600.0, 800.0, ],

RINDEX_value2: [1.458, 1.458, 1.458, 1.458, 1.458, ],

PROPERTY_LIST: ["REFLECTIVITY","ABSLENGTH","SPECULARSPIKECONSTANT","SPECULARLOBECONSTANT" , "BACKSCATTERCONSTANT", "EFFICIENCY", "RINDEX", ],

}

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      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/12/07/18.34-59495-test_reflection.PNG

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1 None: Re: Help on Teflon Reflection needed   (Daren Sawkey - 13 Dec, 2017)
(_ None: Re: Help on Teflon Reflection needed   (Aiwu Zhang - 13 Dec, 2017)
(_ None: Re: Help on Teflon Reflection needed   (Daren Sawkey - 13 Dec, 2017)
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