Commit 462715d4 authored by Håkan Wennlöf's avatar Håkan Wennlöf
Browse files

Merge branch 'trapping_mandic' into 'master' 

Updated the Mandic Trapping Model used in Allpix2

See merge request allpix-squared/allpix-squared!1125
parents b41b3878 3a848215

AUTHORS.md

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@@ -77,3 +77,4 @@ The following authors, in alphabetical order, have developed or contributed to A 
* Morag Williams, University of Glasgow, [williamm](https://gitlab.cern.ch/williamm)

* Koen Wolters, [kwolters](https://gitlab.cern.ch/kwolters)

* Samuel Wood, University of Oxford, [sam-sw](https://github.com/sam-sw)

* Jixing Ye, University of Trento, [jiye](https://gitlab.cern.ch/jiye)

doc/usermanual/06_models/04_trapping.md

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@@ -148,7 +148,7 @@ with the parameters 


```math

\begin{aligned}

c_e      &= 0.054 \,\text{ns}\,\text{cm}^{-2} \\

c_e      &= 0.54 \,\text{ns}\,\text{cm}^{-2} \\

\kappa_e &= -0.62 \\

\\

c_h      &= 0.0427 \,\text{ns}\,\text{cm}^{-2} \\
@@ -159,7 +159,11 @@ c_h &= 0.0427 \,\text{ns}\,\text{cm}^{-2} \\ 
for electrons and holes, respectively.



The parameters for electrons are taken from \[[@Mandic]\], for measurements at a temperature of $`T = -20 \,\text{°C}`$, and

the results extrapolated to $`T = -30 \,\text{°C}`$. A scaling from electrons to holes was performed based on the default

the results extrapolated to $`T = -30 \,\text{°C}`$.



The c_e has been updated accordingly based on the erratum \[[@MandicErratum]\].



A scaling from electrons to holes was performed based on the default

values in Weightfield2 \[[@weightfield2]\].



This model can be selected in the configuration file via the parameter `trapping_model = "mandic"`.
@@ -259,4 +263,5 @@ detrapping_time_hole = 10ns 
[@dortmundTrapping]: https://doi.org/10.1109/TNS.2004.839096

[@CMSTrackerTrapping]: https://doi.org/10.1088/1748-0221/11/04/p04023

[@Mandic]: https://doi.org/10.1088/1748-0221/15/11/p11018

[@MandicErratum]: https://doi.org/10.1088/1748-0221/16/03/E03001

[@weightfield2]: http://personalpages.to.infn.it/~cartigli/Weightfield2/index.html

src/physics/Trapping.hpp

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@@ -131,12 +131,13 @@ namespace allpix { 
     * @brief Mandic effective trapping model

     *

     * Parametrization taken from https://doi.org/10.1088/1748-0221/15/11/P11018, section 5.

     * Updated the c_e based on https://doi.org/10.1088/1748-0221/16/03/E03001

     * Scaling from electrons to holes taken from default beta values in Weightfield2

     */

    class Mandic : virtual public TrappingModel {

    public:

        explicit Mandic(double fluence) {

            tau_eff_electron_ = 0.054 * pow(fluence / Units::get(1e16, "/cm/cm"), -0.62);

            tau_eff_electron_ = 0.54 * pow(fluence / Units::get(1e16, "/cm/cm"), -0.62);

            tau_eff_hole_ = tau_eff_electron_ * (4.9 / 6.2);

        }

    };