beam: 30 keV / 30 uJ
reduce to single bunch for insertion
put FEL imager in
put DD into beam at X=178 mm
we found the signal
centering the DD by minimising the diffrence signal
Bias voltage = 40 V
when moving Y there seems to be some mechanical bending of the detector holder. The position reached the negative end of the range (approx. -9 mm).
When moving out and in again we could find the beam at:
X= 178.629 (centred)
Y= -3.48 (close to center)
see screenshot
run 29 with DD and IMGFEL
The aperture was opened by moving the slits from 2x2 to 4x4 mm
switch to 2 bunches
screenshot
try to center Y position
stop run 29
run 30: approx. 5 min at this position
change FEL-imager ND filter to 0.9 to avoid saturation
run31
take IMGFEL out and switch to 50 bunches
actual X center = 178.44
move left until we loose the signal and scan x from 176.5 to 179.9
y signal changes -> mechanical coupling
run 32
in order to center the Y position we had to move 2 mm down to -5.53
run 33:
move left until we loose the signal and scan x from 176.5 to 179.9
y signal changes
Now the center of y seems to be at -2.88 mm
Image was observed with FEL YAG imager, x movement does not result in a horizontal motion but it is some sort of a diagonal motion
After some movements the y center is now at -5.23 mm
After a new try the y center is at -3.37 mm
Due to the mechanical problem with the Y-position we do the scan with the K-mono chamber X-motor
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see elogs from Jan and Tuba
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Sascha made an orbit kick with 150 bunches
due to some numerical problem the kick is disturbed (see screenshot)
DD can reproduce the kick trace
take run 40
Sascha altered the orbit again 150 bunches
https://ttfinfo.desy.de/XFELelog/show.jsp?dir=/2022/47/26.11_a&pos=2022-11-26T17:20:00
(see attached graph)
take run 41
set bias from 40 V to 100 V
run 42
Bias set to 40 V again
beam changed to 27 keV
x-calibration scan from 8.3 to 11.7 (K-mono X)
run 43
Bias -> 100 V
run 44 (as before)
Bias -> 20 V
run 45
Suspicion: beam is touching K-mono setup
move K-mono chamber to X=4.6 mm and move DDM X to 173.55
Y again has to be adjusted, is now -3.18
bias set to 40 V
scan K-mono X from 3.1 to 6.1
run 46
bias runs: see Tuba's elog
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