890e35a5 |
1 | > Title: |

2 | Alignment of the EMCAL Supermodules for year 1 with corrected geometry |

3 | > Date: |

4 | 05.11.2010 |

5 | > Subdetector: |

6 | EMCAL |

7 | > Report URL: |

8 | https://edms.cern.ch/document/1014917 |

9 | > Version: |

10 | 1 |

11 | > General Observations: |

12 | Surveyed points on the EMCAL support rails are the only reliable |

13 | points to use. They are located at the rail ends, and we have a |

14 | relationship between these survey marks and the modules, assuming |

15 | that the detector as built matches the design. The relationship is |

16 | based on a simplified 3D model of the supermodule, which is an 8 |

17 | cornered box, where 4 corners coincide with the eta = 0 end of the |

18 | modules and the other 4 corners are the survey marks. After |

19 | entering the positions of the 4 survey marks, the 3D application |

20 | CATIA gives the position of the 4 end module corners and the phi |

21 | variation between 2 adjacent supermodules. |

22 | |

23 | The goal is to convert the points from CATIA to a |

24 | transformation matrix for the center of each virtual (software) SuperModule. |

25 | The virtual supermodules are also 8-cornered boxes, but the |

26 | dimensions are determined differently. The x dimension matches the |

27 | size of the strip modules, the y dimension is determined by the strip |

28 | module size and placement (the angle of the strip module changes the |

29 | position of its top-most edge), and the z length is currently 350.0 |

30 | cm, which is approximately 42 cm longer than the active area of the |

31 | physical supermodules. This extra length is a historical artifact from |

32 | the development days of the detector. |

33 | |

34 | Point name format is SMVolumeID_CATIAPointID. |

35 | > Coordinate System: |

36 | ALICEPH |

37 | > Units: |

38 | m |

39 | > Nr Columns: |

40 | 7 |

41 | > Column Names: (choose one) |

42 | Point Name,XPH,YPH,ZPH,Point Type,PrecisionXY(mm),PrecisionZ(mm) |

43 | > Data: |

44 | 40960_00 -0.709 4.312 0.000 T 1 2 |

45 | 40960_01 -0.714 4.318 3.077 T 1 2 |

46 | 40960_10 0.730 4.333 0.000 T 1 2 |

47 | 40960_11 0.726 4.340 3.077 T 1 2 |

48 | 40961_00 0.730 4.333 0.000 T 1 2 |

49 | 40961_01 0.735 4.327 -3.077 T 1 2 |

50 | 40961_10 -0.709 4.312 0.000 T 1 2 |

51 | 40961_11 -0.705 4.307 -3.077 T 1 2 |

52 | 40962_00 -2.158 3.801 0.000 T 1 2 |

53 | 40962_01 -2.170 3.809 3.077 T 1 2 |

54 | 40962_10 -0.807 4.299 0.000 T 1 2 |

55 | 40962_11 -0.817 4.304 3.077 T 1 2 |

56 | 40963_00 -0.807 4.299 0.000 T 1 2 |

57 | 40963_01 -0.797 4.295 -3.077 T 1 2 |

58 | 40963_10 -2.158 3.801 0.000 T 1 2 |

59 | 40963_11 -2.147 3.794 -3.077 T 1 2 |