ATTENUATOR Controller
Attenuation wheels - hardware description
There are two wheels, each contains set of 10 attenuation foils. The wheels
are located one-by-one so total thickness of foils is for x-rays a sum
of foil from wheel#1 and wheel#0.
-
On wheel#1 there are 10 wholes (of diameter 10 mm) covered with quite thick
plates of metal (Al: from 0 to 3 mm; Pb: from 2 to 3 mm).
-
On wheel#0 there are 10 wholes (of diameter 10 mm) covered with thin plates
of metal (Al: from 0 to 0.45mm).
![Attenuator's wheels - fron view [jpg, 300dpi, 26kB]. You can see only wheel#1.](att_front.jpg)
![Attenuator's wheels - side view [jpg, 300dpi, 19kB]. Upper is wheel#1, lower - wheel#0](att_side.jpg)
Since both wheels turn independently you can set 100 different pairs
thus fine tune intensity of measured beam.
|
Position
|
Wheel#1
|
Wheel#0
|
|
metal
|
thickness
[mm]
|
metal
|
thickness
[mm]
|
| 0 |
Al |
0 |
Al |
0 |
| 1 |
Al |
0.50 |
Al |
0.05 |
| 2 |
Al |
1.00 |
Al |
0.10 |
| 3 |
Al |
1.50 |
Al |
0.15 |
| 4 |
Al |
2.00 |
Al |
0.20 |
| 5 |
Al |
2.50 |
Al |
0.25 |
| 6 |
Al |
3.00 |
Al |
0.30 |
| 7 |
Pb |
2.00 |
Al |
0.35 |
| 8 |
Pb |
3.00 |
Al |
0.40 |
| 9 |
none |
user's defined |
Al |
0.45 |
Thickness of attenuating foils on 2 independent wheels