BDSIM: /home/cern/BDSIM_new/src/BDSSbendMagField.cc Source File

00001 /* BDSIM code.    Version 1.0
00002    Author: Grahame A. Blair, Royal Holloway, Univ. of London.
00003    Last modified 24.7.2002
00004    Copyright (c) 2002 by G.A.Blair.  ALL RIGHTS RESERVED. 
00005 */
00006 
00007 #include "BDSGlobalConstants.hh"
00008 #include "G4UniformMagField.hh"
00009 #include "globals.hh"
00010 #include "geomdefs.hh"
00011 #include "BDSSbendMagField.hh"
00012 
00013 const int DEBUG = 0;
00014 
00015 BDSSbendMagField::BDSSbendMagField(const G4ThreeVector& aField,
00016                                const G4double length,
00017                                const G4double angle) 
00018   :G4UniformMagField(aField)
00019 {
00020   if(angle!=0.)
00021     {    // original
00022       //    itsLocalRadius=length/angle;
00023       itsLocalRadius=-length/angle;// minus sign for correct machine convention
00024       // check for synchrotron radiation factors
00025       G4double B_inferred= 
00026         (BDSGlobals->GetBeamMomentum()/GeV)/
00027         (0.299792458 * (GeV/tesla/m)*itsLocalRadius/m);
00028 
00029       if(DEBUG) G4cout<<"B_inferred="<<B_inferred/tesla<<
00030         " aField="<<aField/tesla<<G4endl;
00031     }
00032   else
00033     G4Exception("BDSSbendMagField: zero angle not allowed");
00034 }
00035 
00036 
00037 BDSSbendMagField::~BDSSbendMagField()
00038 {}
00039