- 20060709.lightguide.pdf: PDF writeup
- 20060709.lightguide.tar.gz: tarball

* curvedx2m54x3m09x4m05b.eps: compact focussing lightguide The black dots are focal points on a particular ray. Ideally they would all lie on top of one another. The position of a focal point actually does imply the slope of the focal plane in its vicinity. It only can be changed at the cost of imperfect focussing. The focal plane was twisted to vertical orientation to allow photon detectors to be oriented parallel to the magnetic field. The shorter the focal length, the bigger the focussing imperfections both absolute (in millimetres) and relative (in degrees or beta). The aim was here to get the dynamic range of 20degrees (45-25) into less than 50mm range, so the focal plane could be covered by a standard 50mm or 2" side length PMT. Focussing polynomial is y= -5.4/60^2*x^2 - 0.9/60^3*x^3 - 0.5/60^4*x^4

the focal plane is at x=77mm, these values can be further optimised.

Focussing imperfections [sigma]:

45deg 0.15mm ; 35deg 0.16mm ; 25deg 0.47mm .

- compact focussing lightguide with two reflections:

- curvedx2m54x3m09x4m05m.eps: compact focussing lightguide with two reflections

I am not happy with the focussing (sigma=0.3-0.5mm, quick hand optimisation only), and the vertical focal plane is not the best orientation either, only a compromise propagated from the Disc calculations above. Getting the focal plane perpendicular to the magnetic field may be necessary, which is good news as best focussing is achieved with somewhere between 60-80degrees and not the 90 degrees. No constraint for the focal plane orientation would be even better news... -- KlausFoehl - 06 May 2006

I | Attachment | Action | Size | Date | Who | Comment |
---|---|---|---|---|---|---|

gif | lightguidex2m54x3m09x4m05mirror_.gif | manage | 4.1 K | 05 May 2006 - 21:49 | KlausFoehl | compact focussing lightguide with two reflections |

gif | lightguidex2m54x3m09x4m05_.gif | manage | 4.4 K | 05 May 2006 - 21:48 | KlausFoehl | compact focussing lightguide |

gif | lightguidex2m54x3m09x4m05mirror.gif | manage | 6.0 K | 05 May 2006 - 21:28 | KlausFoehl | compact focussing lightguide with two reflections |

gif | lightguidex2m54x3m09x4m05.gif | manage | 6.6 K | 05 May 2006 - 21:21 | KlausFoehl | compact focussing lightguide |

gif | fit_proofofconceptc.gif | manage | 6.8 K | 09 Jul 2006 - 13:54 | KlausFoehl | optimised lightguide |

gif | lightguidex2m50x3m10x4m10.gif | manage | 8.6 K | 06 May 2006 - 13:38 | KlausFoehl | possible Barrel end |

eps | curvedx2m54x3m09x4m05m.eps | manage | 10.8 K | 05 May 2006 - 21:29 | KlausFoehl | compact focussing lightguide with two reflections |

eps | curvedx2m54x3m09x4m05b.eps | manage | 22.9 K | 05 May 2006 - 21:23 | KlausFoehl | compact focussing lightguide |

20060709.lightguide.pdf | manage | 105.0 K | 09 Jul 2006 - 13:43 | KlausFoehl | PDF writeup | |

gz | 20060709.lightguide.tar.gz | manage | 276.0 K | 09 Jul 2006 - 13:44 | KlausFoehl | tarball |

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