1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // |
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28 | |
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29 | #include "globals.hh" |
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30 | |
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31 | #include "G4GeometryManager.hh" |
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32 | |
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33 | #include "F04GlobalField.hh" |
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34 | |
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35 | #include "F04FocusSolenoid.hh" |
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36 | #include "F04SimpleSolenoid.hh" |
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37 | |
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38 | F04FocusSolenoid::F04FocusSolenoid(G4double Ba, G4double Bb, G4double fz, |
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39 | G4LogicalVolume* lv, |
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40 | G4ThreeVector c) : F04SimpleSolenoid(B1, fz, lv, c) |
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41 | |
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42 | { |
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43 | B1 = Ba; |
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44 | B2 = Bb; |
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45 | Half = false; |
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46 | } |
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47 | |
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48 | void F04FocusSolenoid::addFieldValue(const G4double point[4], |
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49 | G4double field[6]) const |
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50 | { |
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51 | G4ThreeVector global(point[0],point[1],point[2]); |
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52 | |
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53 | G4ThreeVector local = global2local.TransformPoint(global); |
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54 | |
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55 | if (isOutside(local)) return; |
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56 | |
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57 | G4double length = ((F04SimpleSolenoid*)this)->getLength(); |
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58 | |
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59 | G4double Bz = (B2-B1) * std::abs(local.z())/(length/2.) + B1; |
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60 | |
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61 | if (Half) { if (local.z() >= 0.) Bz = B1; } |
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62 | |
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63 | G4ThreeVector B(0.0,0.0,Bz); |
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64 | |
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65 | B = global2local.Inverse().TransformAxis(B); |
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66 | |
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67 | field[0] += B[0]; |
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68 | field[1] += B[1]; |
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69 | field[2] += B[2]; |
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70 | } |
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