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Changes for page Filter-Units

Last modified by sndueste on 2025-04-23 17:45
From version 25.1
edited by sndueste
on 2021-11-02 14:15
Change comment: There is no comment for this version
To version 27.6
edited by sndueste
on 2025-04-23 14:29
Change comment: Renamed back-links.

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1 +FS-FLASH USER tmp.Additional helpful things.jddd-linked help pages.WebHome
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1 -
2 -
3 3  {{toc/}}
4 4  
5 5  = Filter control =
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10 10  
11 11  The moving procedure is supervised by a protection system. First of all the fast shutter is closed before moving the filter wheel (to protect the filters during moving) and blocked till the movement is over. Then the fast shutter has to be opened again with the Fast shutter control button. It does not open automatically!
12 12  
13 -In addition the pulse energy and the number of bunches in the FEL is monitored. IF the radiation dose exceeds a certain limit the filters can not be moved into the beam. Then the beam has to be attenuated using the gas attenuator to a range where the filters can be used again. More info: [[JdddFilterProtection>>doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter protection in jddd.WebHome]]
11 +In addition the pulse energy and the number of bunches in the FEL is monitored. IF the radiation dose exceeds a certain limit the filters can not be moved into the beam. Then the beam has to be attenuated using the gas attenuator to a range where the filters can be used again. More info: [[JdddFilterProtection>>doc:FS-FLASH USER tmp.jddd-linked help pages.Filter-Units.Filter protection in jddd.WebHome]]
14 14  
15 -Current limits are:  [[image:attach:doselimits.jpg||height="250"]]:
13 +Current limits are: [[image:attach:image2021-11-11_13-46-32.png||height="250"]]
16 16  
15 +(until Nov 2021 we had 300 µJ for single pulse and 2000µJ for the bunch train integral as limit. This turned out to be to much since several filters (mainly Nd and Zr) got damaged in 2020 and 2021) 
16 +
17 17  \\
18 18  
19 19  == Calculation of the transmission ==
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24 24  We tried to use the measured transmission where ever we have measured data. The measurement in the end includes e.g. oxide layers that may alter the transmission significantly ( see example for Al below).
25 25  
26 26  Thus the displayed transmission may be different from the CXRO calculations using the pure filter material (with out oxide layers).
27 -
28 -Since we do not have measured values for all filters / thicknesses  and wavelength ranges there may be situations where the shown transmission may be e.g. smaller for a thinner filter of the same material (since it was measured) in comparison to a thicker (not measured) one ...
29 29  {{/info}}
30 30  
31 31  \\
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56 56  
57 57  = Filter transmission - measurements and oxide layers =
58 58  
59 -* The transmission data for the transmission calculation in jddd uses combined data from CXRO and the measures transmission from BESSY.
57 +* The transmission data for the transmission calculation in jddd uses combined data from CXRO and the measures transmission from BESSY / PTB.
60 60  * Thin oxide layers may alter the transmission significantly. As was found for the thin Al foils a transmission of 6 nm (2x3nm) Al,,2,,O,,3,, fits well with the measured data - at least much better as compared to only using Al without oxide layer.
61 61  * [[image:attach:image2021-11-2_14-6-43.png||height="250"]][[image:attach:image2021-11-2_14-6-54.png||height="250"]][[image:attach:image2021-11-2_14-7-1.png||height="250"]]
62 62  * similar results are obtained for Si and Zr ... see filter details below
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65 65  
66 66  \\
67 67  
68 -* [[doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter details.WebHome]]
66 +* [[doc:FS-FLASH USER tmp.jddd-linked help pages.Filter-Units.Filter details.WebHome]]
69 69  
70 70  \\
71 71  
72 72  = Documentation of the filter protection in jddd =
73 73  
74 -* [[JdddFilterProtection>>doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter protection in jddd.WebHome]]
72 +* [[JdddFilterProtection>>doc:FS-FLASH USER tmp.jddd-linked help pages.Filter-Units.Filter protection in jddd.WebHome]]
75 75  
76 76  = More (special) info =
77 77  
78 78  == Mounted filters, replacement in N2 box ==
79 79  
80 -* [[Filter History and mounted filters of FLASH1 and FLASH2:>>doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter wheels in FLASH1 and FLASH2.WebHome]] what filter was mounted at which motor position
78 +* [[Filter History and mounted filters of FLASH1 and FLASH2:>>doc:FS-FLASH USER tmp.jddd-linked help pages.Filter-Units.Filter wheels in FLASH1 and FLASH2.WebHome]] what filter was mounted at which motor position
81 81  * [[doc:FLASHUSER.jddd-linked help pages.Filter-Units.Replacement filters in N2 flow box.WebHome]]
82 82  
83 83  \\
100 nm Al measured transmission_with Oxid.png
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2020-09-16 14_51_08-combined filter transmission for server.opju _ - __win.desy.de_home_sndueste_My .png
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Al_filters.pdf
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AllFiltersPTB.pdf
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DESY_KW17_15_Filter.zip
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Filterrad.opj
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Filters_mounted_BL_filter_wheel.pdf
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Filters_replacement.pdf
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Mercadier_FLASH_filters.pdf
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TransmissionFilterwheel.pdf
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TransmissionFilterwheel_FLASH1.pdf
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doselimits.jpg
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filter overview.jpg
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transmissioncurves.jpg
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