Filter details
- Filter transmission details
- Mounted filters, replacement in N2 box
- Data collection of FEL parameters and Filter damage
Filter transmission details
- The transmission data can be found at e.g. (depending on the filter wheel) /export/doocs/server/blfilters2_server/data/ or http://doocs-git.desy.de/cgit/doocs/server/photondiag/filterwheel.git/tree/data files generated from CXRO. We use the WL range 0.5 nm to 60 nm
- Transmission of filters calculated from CXRO as pdf for and filter wheels
- : Transmission of filters as measured by PTB as pdf (and here are the )
- : Transmission of Nb, Zr, Al, Si Luxel filters measured between 2.5nm and 25nm by the PTB in comparison with CXRO data
- : Laurents transmission measurements for "Rohringer" Beamtime - shows deviations for Si !
Filter overview - what transmission data is actually shown
filter type | actually used transmission data for the DOOCS display | comments | |
|---|---|---|---|
Al 100 nm | CXRO data for 100 nm Al and 2x 3 nm Oxide | in agreement with FLASH and PTB measurements | |
Al 200 nm | CXRO data for 200 nm Al and 2x 3 nm Oxide | in agreement with FLASH and PTB measurements | |
Al 400 nm | CXRO data for 400 nm Al and 2x 3 nm Oxide | in agreement with FLASH measurements | |
Al 500 nm | CXRO data for 500 nm Al and 2x 3 nm Oxide | used the same Oxide layers as for thinner filters - no measurements available | |
Al 780 nm | CXRO data for 780 nm Al and 2x 3 nm Oxide | used the same Oxide layers as for thinner filters - no measurements available | |
C/Al/C 500 nm | CXRO data for 500 nm Al + 2x 3 nm Al Oxide and 500 nm C | used the same Oxide layer for Al as for thinner filters - no measurements available | |
Zr 200 nm | CXRO data for 200 nm Zr and 2x 7 nm Oxide | in agreement with FLASH and PTB measurements | |
Zr 290 nm | CXRO data for 290 nm Zr and 2x 7 nm Oxide | in agreement with FLASH and PTB measurements | |
Zr 330 nm | CXRO data for 330 nm Zr and 2x 7 nm Oxide | used the same Oxide layer as for thinner filters - no measurements available | |
Nb 200 nm | PTB measurements (2.5nm and 25nm) - shorter and longer Wl extrapolated with CXRO data | based on PTB measurements | |
Nb 380 nm | PTB measurements (2.5nm and 25nm) - shorter and longer Wl extrapolated with CXRO data | based on PTB measurements | |
Nb 980 nm | CXRO data for Nb 980 nm | no measurements available | |
SI 220 nm | CXRO data for 220 nm Si and 2x 3 nm Si Oxide and 2x10 nm carbon layer | in agreement with FLASH and PTB measurements | |
Si 400 nm | CXRO data for 400 nm Si and 2x 3 nm Si Oxide and 2x10 nm carbon layer | in agreement with FLASH and PTB measurements |
Measurements at FL21 (2021)
Aluminium filters
- An oxide layer thickness of 2 x 3 nm fits the PTB and the FLASH measurements well and agrees with the expected thickness
- According to Wikipedia/ PhysRevLett.82.4866 : "Metallic aluminium is very reactive with atmospheric oxygen, and a thin passivation layer of aluminium oxide (4 nm thickness) forms on any exposed aluminium surface in a matter of hundreds of picoseconds."
Silicon
here one expects also only few nm of oxide. this is however not sufficient to explain the measured transmissions. an additional layer of (2x) 10 nm carbon contamination was assumed to get an agreement to the measurements.
Zirconium
for Zr an oxide layer of (2x) 7.5 nm was assumed to get agreement with the measured data. The difference with and without oxide is however not very large ...
for the other filters there is either only a small difference between measurement and calculated transmission or we do not have measurements and use the CXRO data ...
Mounted filters, replacement in N2 box
- Filter History and mounted filters of FLASH1 and FLASH2: what filter was mounted at which motor position
- Replacement filters in N2 flow box
Data collection of FEL parameters and Filter damage
Filter material | Thickness[nm] | Wavelength [nm] | pulse energy [µJ] | # of Bunches | Apertures? | Integral dose (mJ) | Filter unit | survived? | date | Comments |
Al | 100 | 13 | 300 | 1 | 3mm | ~3 | BL wheel 2 | hours | Sept 2014 | Adrians beamtime |
Al | 198 | 13 | 1.8 | 401 | 3mm | ~0.7 | BL wheel 2 | ~10 minutes | August 2014 | only in combination with Nb 385nm on wheel 1, Attenuator with Xe at 5% transmission (0.15mbar), Industry beamtime |
Nb | 385 | 13 | 1.8 | 401 | 3mm | ~0.7 | BL wheel 1 | ~10 minutes | August 2014 | only in combination with Al 198nm on wheel 2, Attenuator with Xe at 5% transmission (0.15mbar), Industry beamtime |
Nb | 197 | 13 | 2.5 | 401 | 3mm | ~1 | BL wheel 2 | ~10 minutes | August 2014 | only in combination with Al 423 nm on wheel 1, Attenuator with Xe at 5% transmission (0.15mbar), Industry beamtime |
Al | 423 | 13 | 2.5 | 401 | 3mm | ~1 | BL wheel 2 | ~15 minutes | August 2014 | only in combination with Al 423nm on wheel 1, Attenuator with Xe at 5% transmission (0.15mbar), Industry beamtime |
Al | 101 | 13 | 2.5 | 401 | 3mm | ~1 | BL wheel 2 | ~15 minutes | August 2014 | only in combination with Al 423nm on wheel 1, Attenuator with Xe at 5% transmission (0.15mbar), Industry beamtime |
Al | 298 | 13 | 2.5 | 401 | 3mm | ~1 | BL wheel 2 | ~15 minutes | August 2014 | only in combination with Al 423nm on wheel 1, Attenuator with Xe at 5% transmission (0.15mbar), Industry beamtime |
C Al C | 500 | 13 | 2.5 | 401 | 3mm | ~1 | BL wheel 2 | ~15 minutes | August 2014 | only in combination with Al 423nm on wheel 1, Attenuator with Xe at 5% transmission (0.15mbar), Industry beamtime |
Al | 423 | 13 | 2.5 | 401 | 3mm | ~1 | BL wheel 1 | ~1 h | August 2014 | Industry beamtime, Attenuator with Xe at 5% transmission (0.15mbar) |
Al | 423 | 13 | 70 | 1 | 3mm | 0.07 | BL wheel 1 | ~1 h | August 2014 | Industry beamtime |
Al | 193 | 13 | 52 | 1 | 3mm | 0.05 | BL wheel 1 | ~1 h | August 2014 | Industry beamtime |
Al | 193 | 13 | 50-80 | 1 | 3mm, 5mm, 10mm | ~0.1 | BL wheel 1 | ~30min | August 2014 | Industry beamtime |
Si | 419 | 19 | 15-20 | 87 | 3mm | 1.3 | BL wheel 1 | 36h | June 2014 | Moshammer beamtime , ~ 70% of beam were absorbed! http://ttfinfo.desy.de/ExpHallelog/show.jsp?dir=/2014/24/13.06&pos=2014-06-13T17:17:44 |
Al | 400 | 19 | 15-20 | 87 | 3mm | 1.3 | BL wheel 1 | many h | June 2014 | Moshammer beamtime , ~ 70% of beam were absorbed! http://ttfinfo.desy.de/ExpHallelog/show.jsp?dir=/2014/24/13.06&pos=2014-06-13T17:56:57 |
Zr | 200 | 19 | 2-3 | 77 | 1mm | 0.2 | BL wheel 1 | few h | June 2014 | |
Al | 100 | 13 | 6-8 | 15 | 1mm ! | ~ 0.1 | BL | short ? - then BROKEN | Jan 2014 | |
Al | 200 | 4 | 180 | 1 | none, but 2-3 mm beam in the hall | ~ 0.2 | BL | yes, minutes | Dec 2013 | |
Al | 400 | 4 | 180 | 1 | none, but 2-3 mm beam in the hall | ~ 0.2 | BL | yes, minutes | Dec 2013 | |
Si3N4 | 350 | 4.3 | 180 | 1 | none, but 2-3 mm beam in the hall | ~ 0.2 | BL | yes, minutes | Dec 2013 | |
Al | 100 | 4.3 | 180 | 1 | none, but 2-3 mm beam in the hall | ~ 0.2 | BL | BROKEN | Dec 2013 | |
Si | 220 | 4.3 | 180 | 1 | none, but 2-3 mm beam in the hall | ~ 0.2 | BL | BROKEN | Dec 2013 | |
Zr | 220 | 4.3 | 180 | 1 | none, but 2-3 mm beam in the hall | ~ 0.2 | BL | BROKEN | Dec 2013 | |
Al | 100 | 6.8 | 80 | 30 | 3mm | 2.4 | BL | BROKEN | Mar 2011 |
