Wiki source code of Info collection for the BAM
Version 1.1 by sendels on 2019-08-09 12:46
Show last authors
| author | version | line-number | content |
|---|---|---|---|
| 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"]] | ||
| 2 | |||
| 3 | \\ | ||
| 4 | |||
| 5 | * the relevant data is the Arrivaltime FLASH.SDIAG/BAM/4DBC3/LOW_CHARGE_ARRIVAL_TIME | ||
| 6 | |||
| 7 | \\ | ||
| 8 | |||
| 9 | * There are now (since March 2017) LOW and HIGH charge channels. for now the LOW_CHARGE Channel is the relavant one. | ||
| 10 | |||
| 11 | \\ | ||
| 12 | |||
| 13 | * bigger numbers indicate later arrivaltime of the electrons | ||
| 14 | |||
| 15 | \\ | ||
| 16 | |||
| 17 | * the arrivaltime sould be within -20 ps and +20 ps . otherwise there might be a problem ... | ||
| 18 | |||
| 19 | \\ | ||
| 20 | |||
| 21 | * There is a BAM status parameter: FLASH.SDIAG/BAM/4DBC3/BAM_STATUS.1 (the 1 indicates FLASH1) | ||
| 22 | ** bit 0 (value: 1) = data is valid, | ||
| 23 | ** bit 1 (value: 2) = at least 1 bunch is present, | ||
| 24 | ** bit 2 (value: 4) = calibration is on, | ||
| 25 | ** bit 3 (value: 8) = internal feedback is on, | ||
| 26 | ** bit 4 (value: 16) = tuning mode is on | ||
| 27 | |||
| 28 | \\ | ||
| 29 | |||
| 30 | * if DBC3 is not working then also 3DBC2 can be used. there is a linear correlation between BC2 and BC3 | ||
| 31 | |||
| 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.) | ||
| 33 | |||
| 34 | \\ | ||
| 35 | |||
| 36 | \\ | ||
| 37 | |||
| 38 | === more Info: === | ||
| 39 | |||
| 40 | \\ | ||
| 41 | |||
| 42 | * [[talk by Marie (2011)>>attach:FLASH-seminar-2011_BAM_study_results.pdf]] | ||
| 43 | * contact: Marie Kristin Czwalinna | ||
| 44 | |||
| 45 | \\ | ||
| 46 | |||
| 47 | == Streak camera info == | ||
| 48 | |||
| 49 | \\ | ||
| 50 | |||
| 51 | * the streak camera measures the delay between optical (amplified) laser and FEL (dipole radiation). - not in respect to the master clock ! | ||
| 52 | * streak camera ONLY delivers data which is averaged over seveal 10 seconds. there is NO shot to shot info. | ||
| 53 | * a larger value of the streak camera delay indicates that the optical laser comes later than the FEL (or FEL earlier than the laser ...) |