X23A2 Ion Chambers
- Run at 600 volts
- Beam (before the mirror) passes 28.1 cm above the table top
This table gives the heights of the centers of the ion chamber windows for various common mirror angles:
When the mirror is at |
I0 front |
I0 back |
It front |
It back |
Ir front |
Ir back |
absent |
28.1 cm |
28.1 cm |
28.1 cm |
28.1 cm |
28.1 cm |
28.1 cm |
0.22 |
28.4 cm |
28.5 cm |
28.7 cm |
28.9 cm |
28.9 cm |
29.1 cm |
Testing the new ion chambers
The measurement shown here is an 88 point time sequence measured soon after a fill at 9862 eV with N2 in all chambers and all chambers at 108 gain.
The noise measurements were made using this data file and this Ifeffit macro.
I00
This is a 3 inch chamber upstream of the slits. It is used as the signal for the second crystal feedback system.
Time series + linear fit |
Residual of linear fit |
|
|
average signal |
16254 |
standard deviation |
1.8377 |
noise |
0.113E-03 |
I0
This is a 4 inch chamber downstream of the mirror and upstream of the sample.
Time series + linear fit |
Residual of linear fit |
|
|
average signal |
8929 |
standard deviation |
1.0260 |
noise |
0.115E-03 |
It
This is an 8 inch chamber downstream of the sample.
Time series + linear fit |
Residual of linear fit |
|
|
average signal |
13631 |
standard deviation |
1.4417 |
noise |
0.106E-03 |
Ir
This is an 8 inch chamber at the end of the table.
Time series + linear fit |
Residual of linear fit |
|
|
average signal |
12888 |
standard deviation |
1.3666 |
noise |
0.106E-03 |