Last modified by sndueste on 2025/02/06 10:58
From version 3.1
edited by sndueste
on 2020/04/08 15:01
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To version 1.1
edited by sendels
on 2019/08/09 12:46
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1 -XWiki.sndueste
1 +XWiki.sendels
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1 +* [[LINK to detailled infos from MSK~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:http://mskwiki/index.php?title=BAM-DAQ_Channels||shape="rect"]]
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1 1  * the relevant data is the Arrivaltime FLASH.SDIAG/BAM/4DBC3/LOW_CHARGE_ARRIVAL_TIME
2 -* besides the arivaltime from FLASH1 there is also the FLASH2/3 electron arrival time saved. The BAM data is saved for the complete RF pulse. First bunches are from FLASH1 then there is a gap for switching and then there is a second part for FLASH2 (starting at the FLASH2 start time (recorded in DAQ as {{code language="none"}}/FL2/Timing/start time flash2{{/code}}))
3 3  
4 4  \\
5 5  
6 6  * There are now (since March 2017) LOW and HIGH charge channels. for now the LOW_CHARGE Channel is the relavant one.
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7 7  * bigger numbers indicate later arrivaltime of the electrons
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8 8  * the arrivaltime sould be within -20 ps and +20 ps . otherwise there might be a problem ...
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9 9  * There is a BAM status parameter: FLASH.SDIAG/BAM/4DBC3/BAM_STATUS.1 (the 1 indicates FLASH1)
10 10  ** bit 0 (value: 1) = data is valid,
11 11  ** bit 1 (value: 2) = at least 1 bunch is present,
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17 17  
18 18  * if DBC3 is not working then also 3DBC2 can be used. there is a linear correlation between BC2 and BC3
19 19  
32 +(from Marie: der groesste Drift-Beitrag kommt immer aus dem Injektor (also alles zw. Injektorlaser und ACC39) Einfluss von ACC23 ist deutlich kleiner. Im Mittel hat man einen linearen Zusammenhang zw. Ankunftszeit BC2 zu BC3.)
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21 21  
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37 +
22 22  === more Info: ===
23 23  
24 24  \\
25 25  
26 -* [[LINK to detailed infos from MSK (may only work inside DESY network)(% class="confluence-embedded-file-wrapper confluence-embedded-manual-size" %)~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:http://www.desy.de/~~mbock/pages/BAM_daq_channel_descriptions.html||rel="nofollow" shape="rect" class="external-link"]]
27 27  * [[talk by Marie (2011)>>attach:FLASH-seminar-2011_BAM_study_results.pdf]]
28 28  * contact: Marie Kristin Czwalinna
29 29  
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34 34  \\
35 35  
36 36  * the streak camera measures the delay between optical (amplified) laser and FEL (dipole radiation). - not in respect to the master clock !
37 -* streak camera ONLY delivers data which is averaged over several 10 seconds. there is NO shot to shot info.
52 +* streak camera ONLY delivers data which is averaged over seveal 10 seconds. there is NO shot to shot info.
38 38  * a larger value of the streak camera delay indicates that the optical laser comes later than the FEL (or FEL earlier than the laser ...)