parse_extinguish.cpp

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/* This file is part of Cloudy and is copyright (C)1978-2017 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */
/*ParseExtinguish parse the extinguish command */
#include "cddefines.h"
#include "rfield.h"
#include "parser.h"

/*ParseExtinguish parse the extinguish command */
void ParseExtinguish( Parser &p )
{
        // extinguish ionizing continuum by absorbing column AFTER
        // setting luminosity or intensity.  First number is the column
        // density (log), second number is leakage (def=0%)
        // last number is lowest energy (ryd), last two may be omitted
        // from right to left 
        // 
        // extinction is actually done in extin, which is called by ContSetIntensity

        DEBUG_ENTRY( "ParseExtinguish()" );

        rfield.ExtinguishColumnDensity = (realnum)p.FFmtRead();
        if( p.lgEOL() )
                p.NoNumb("extinguishing column");

        // default is for the number to be the log of the column. 
        // there is a linear option for the column or optical depth,
        // if linear does not occur then log, and convert to linear */
        if( !p.nMatch("LINE"  ) )
        {
                if( rfield.ExtinguishColumnDensity>35. )
                {
                        fprintf(ioQQQ,
                                " The first parameter on this command line is the log of either the column density or optical depth.\n");
                        fprintf(ioQQQ,
                                " The value seems pretty big to me - please check it.\n");
                        /* flush it since we will probably crash */
                        fflush(ioQQQ);
                }
                rfield.ExtinguishColumnDensity = exp10(rfield.ExtinguishColumnDensity);
        }

        /* option to set leakage - default is 0. */
        rfield.ExtinguishLeakage = (realnum)p.FFmtRead();
        if( p.lgEOL() )
                rfield.ExtinguishLeakage = 0.;

        /* negative leaks are logs */
        if( rfield.ExtinguishLeakage < 0. )
                rfield.ExtinguishLeakage = exp10(rfield.ExtinguishLeakage);

        if( rfield.ExtinguishLeakage > 1. )
        {
                /* but leaks greater than 1 are not allowed */
                fprintf( ioQQQ, " A leakage of%9.0f%% was entered - this must be less than 100%%\n", 
                        rfield.ExtinguishLeakage*100. );
                cdEXIT(EXIT_FAILURE);
        }
        // user input check that H-ionizing radiation is blocked if
        // table Draine used */
        rfield.lgBlockHIon = true;

        /* option to set lowest energy for absorber */
        rfield.ExtinguishLowEnergyLimit = (realnum)p.FFmtRead();
        if( p.lgEOL() )
                rfield.ExtinguishLowEnergyLimit = 0.99946f;
        else
        {
                if( rfield.ExtinguishLowEnergyLimit <= 0. )
                        rfield.ExtinguishLowEnergyLimit = exp10(rfield.ExtinguishLowEnergyLimit);
                if( rfield.ExtinguishLowEnergyLimit < 0.99946 )
                        fprintf( ioQQQ, " Energy less than 1 Ryd!!\n" );
        }

        /* specify optical depth at 1 Ryd rather than column density */
        if( p.nMatch("OPTI"  ) )
        {
                /* convert the optical depth into the proper column density */
                rfield.ExtinguishColumnDensity /= (realnum)(rfield.ExtinguishConvertColDen2OptDepth*
                        pow(rfield.ExtinguishLowEnergyLimit,rfield.ExtinguishEnergyPowerLow) );
        }

        return;
}