Parameters of the beamline cameras
Position / name | Camera type | looks from left or right (in beam dir) | lens type | iris setting | calibration hor (mm/pix) | calibration vert (mm/pix) | Hor/Vert ratio | calibration image | calibration date | comment |
Ce:YAG cam | AC 1300 30 gm | left | 50 mm and 15 mm rings | motorized | 0.0157 | 0.0225 | looking at the +- 5 mm marks | 2014 | looks under quite funny angle ... http://ttfinfo.desy.de/ExpHallelog/show.jsp?dir=/2015/21/18.05&pos=2015-05-18T16:59:33 | |
BL0M0 | A311f | right | 0.216 (for BL with 30 deg accounted for ) | 0.109 (for BL) | ||||||
BL0M1 | A311f | |||||||||
BL3M0 | A311f | right | 25mm lens and 2 1mm rings. | 2 | BL3: 0.21 ; BL1/2: 0.17 | BL3: 0.080 ; BL1/2: 0.070 | 0.43 (24 deg) | May 2015 | ||
BL3M1 | A311f | right | 50 mm lens right at the window flangue ( diufficult to acess ) | 1.4 | 0.091 +-0.01 | 0.041 +- 0.005 | 0.5 | March 2014 | the mirror was moved in 1 mm steps horizontal, the vertical calibration is based on a round alignment laser (here a aspect ratio of 2:1 was found) | |
BL3M2 | A311f | left ( thus the focussed beam is closer to the camera) | 25mm lens with 2 mm rings | 1.4 | focussed: 0.174 unfocussed: 0.22 | focussed: 0.078 unfocussed: 0.093 | 0.58 (= 30 deg) | May 2015 | ||
BL1M0 | A311f | left | 25mm 2 mm rings | BL2: 0.13 / BL1: 0.17 | BL2: 0.071 / BL1: 0.080 | 0.58 | ||||
BL1M1 | A311f | left (only one beampos monitired) | 50 mm lens with 12 mm intermedeate rings | 2 | 0.081 (incl 30 deg) | 0.037 | 0.52 (= 27 deg screen) | May 2015 | exchanged the old 16 mm lens with 50 mm | |
BL2M0 | A311f | right ( thus the UNfocussed beam is closer to the camera) | 50 mm and 5 mmm intermedeate ring | 1.4 | focussed:0,144 (incl 30 deg) unfocussed: ??? | focussed: 0.061unfocussed: ??? | 0.5 | May 2015 | the old 25 mm lens was changed to the 50 mm to get a better usage of the camera image | |
BL2Filt | A311f | left | 25 mm lens with 2 rings , | 1.4 | 0.11 (+- 0.01) | 0.060 | 0.7 | May 2015 | ||
FLASH2 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
FL2_CE_YAG_DET1 | AC 1300 30 gm | left | 25mm computar | Motorized | ||||||
FL2_CE_YAG_DET2 | AC 1300 30 gm | left | 25mm computar | motorized | 0.041 (with binning2) | 0.053 (with binning2) | May2014 | |||
FL2_CE_YAG_DET3 | ||||||||||
FL2_CE_YAG_DET4 | ||||||||||
FL2_SCR0 | AC 1300 30 gm | left | 16mm computar + 2x 1 mm intermedeate Rings | motorized | 0.13 (with binning2) | 0.062 (with binning2) | 0.56 = 30deg | May2015 | ||
FL2_SCR1 | AC 1300 30 gm | left | 16mm computar + 2x 1 mm intermedeate Rings | motorized | 0.10 (with binning2) | 0.05 (with binning2) | 0.52 = 30deg | May2015 | ||
FL2_SCR2 | AC 1300 30 gm | left | 16mm computar + 2x 1 mm intermedeate Rings | motorized | 0.10 (with binning2) | 0.05 (with binning2) | 0.50 = 30deg | May2015 | ||
FL21_SCR1 | ||||||||||
FL21_SCR2 | ||||||||||
FL22_SCR2 | ||||||||||
FL24_SCR1 | ||||||||||
FL24_SCR2 | ||||||||||
FL24_SCR3 | ||||||||||
FL24_SCR4A | ||||||||||
FL24_SCR4B | ||||||||||
FL24_PINHOLE_A | ||||||||||
FL24_PINHOLE_B | ||||||||||
FL26_SCR1 | ||||||||||
Important calibration Things
Calibration procedure
- Calibration with marks / holes
- first the size in pixel of a structure of known size is determined. (be careful images saved as PNG may have a different pixel size as the original image !!)
- The Vertical calib factor can be determined directly
- The hor calib factor hat to take into account that the beam on the screen is larger due to the projection. So the calibration factor is larger for the horizontal direction in contrast to the vertical. this gives the angle of the screen in respect to the camera Tan = projection / beam. for the beam one can use the vertical size ( for round objects / beams). This gives the calibration for objects on the screen. However the Beam is projected on the screen and is larrger than the beam itself. and as second step one has to include the projection of the beam onto the screen with the factor Cos(screen angle)
- for our 30 deg screns this is: calib(for Beamprofiles) = calib(with objects on the screen) / Cos(screen angle) = calib(with objects on the screen) * 1.15
- for illustration:
Distance Focussing mirror to Screen.
For BL2 and 3 the distance of the screen is about 55 cm from middle of the ellipsoid to the screen.
Screen dimensions
Height: 40 mm
Large holes: 2 mm diameter
Small holes: 1 mm diameter
distance of the large holes vertical: 10 mm
distance of the large and the small hole horizontal: 5 mm
distance of the hole groups horizontal: 23 mm
- Beamline_screens.jpg:
There is also an older Version with only 3 holes. there the diameter is also 2 mm and the distance between the holes is 23 mm