Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 1.1
edited by sendels
on 2019/05/15 16:08
Change comment: There is no comment for this version
To version 4.1
edited by sndueste
on 2019/08/22 15:54
Change comment: There is no comment for this version

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Author
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1 -XWiki.sendels
1 +XWiki.sndueste
Content
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1 -The MTCA based triggers have a jitter in the few ps range, the delay can be shifted in 1 ns steps (over many ms), one can choose between 10 Hz triggers, frequencies locked to the pulses (e.g. 1MHz) and the actual bunch patterns. A detailled description can be found in [[x2Timer manual>>url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/x2Timer.pdf||shape="rect"]]. And here is the [[little talk>>url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtca_trigger.pdf||shape="rect"]] that was given in the group meeting Oct 2014
1 +The MTCA based triggers have a jitter in the few ps range, the delay can be shifted in 1 ns steps (over many ms), one can choose between 10 Hz triggers, frequencies locked to the pulses (e.g. 1MHz) and the actual bunch patterns. A detailled description can be found in [[x2Timer manual>>attach:FLASH.TriggerHowTo@x2Timer.pdf]]. And here is the [[little talk>>attach:FLASH.TriggerHowTo@mtca_trigger.pdf]] that was given in the group meeting Oct 2014
2 2  
3 3  in short: the triggers are for low impedance (~~50 OHM terminated ?? ), 5V triggers with an adjustable width. The main controlpannel for the x2 timer has the control options for the 3 front modules (connected with a RJ45 cable - connecting to a "trigger box" with 2 trigger exits (Lemo) each) and 8 Lemo exits at the back of the crate. in the BL-beamline case these triggers are connected to the BNC (patch pannel) ports at the rack.
4 4  
5 -The main control can be done with a simplified user panel which can handel the timing in respect to the FEL pulses and not in respect to some (arbitrary) reference time ( Event)[[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/Trigger_scheme.gif||alt="Trigger_scheme.gif" width="1255" height="937"]]
5 +The main control can be done with a simplified user panel which can handel the timing in respect to the FEL pulses and not in respect to some (arbitrary) reference time ( Event)[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/Trigger_scheme.gif~|~|alt="Trigger_scheme.gif" width="800"~]~]>>attach:Trigger_scheme.gif]]
6 6  
7 7  
8 8  \\
9 9  
10 -there is a more advanced control pannel (by MCS4) to change more subtile parameters:
10 +there is a more advanced control panel (by MCS4) to change more subtle parameters:
11 11  
12 12  \\
13 13  
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15 15  \\
16 16  
17 17  
18 -[[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger3k.png||alt="mtcatrigger3k.png" width="608" height="461"]]
18 +[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger3k.png~|~|alt="mtcatrigger3k.png" width="608" height="461"~]~]>>attach:mtcatrigger3k.png]]
19 19  
20 20  one can configure each channel for a trigger event
21 21  
22 22  **FLASH1**
23 23  
24 +(% class="wrapped" %)
24 24  |(((
25 25  trigger No
26 26  )))|(((
... ... @@ -63,6 +63,7 @@
63 63  
64 64  **FLASH2**
65 65  
67 +(% class="wrapped" %)
66 66  |(((
67 67  trigger No
68 68  )))|(((
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82 82  from this trigger as starting point one can shift the timing in 9 ns steps forst and finally in 0.9 ns steps for fine adjustment.
83 83  
84 84  
85 -[[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger1.png||alt="mtcatrigger1.png" width="811" height="532"]]
87 +[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger1.png~|~|alt="mtcatrigger1.png" width="811" height="532"~]~]>>attach:mtcatrigger1.png]]
86 86  
87 87  \\
88 88  
89 89  * in order to generate a stable frequency one has to set the input source to FPGA clock (and use dividers to get the desired frequency)
90 -* to generate the burst patterns of the FEL one has to choose a trigger event (best 116 for FLASH 2 and 16 for FLASH1) and activate Destination 1 for FLASH1 and Destination 2 for FLASH2 . finally one has to assign the activated Bunch pattern mask to the trigger channel of choise . now the pattern can be shifted and the trigger width can be changed as with the 10 Hz triggers. **IMPORTANT: to move the bunchtrain to the desired starting point the DELAY in the expertpennal (see below) has to be used. The Trigger in the user panel (see above) has to be set to 0 !!!**
91 -[[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger2k.png||alt="mtcatrigger2k.png" width="607" height="458"]]
92 +* to generate the burst patterns of the FEL one has to choose a trigger event (best 116 for FLASH 2 and 16 for FLASH1) and activate Destination 1 for FLASH1 and Destination 2 for FLASH2 . finally one has to assign the activated Bunch pattern mask to the trigger channel of choice . now the pattern can be shifted and the trigger width can be changed as with the 10 Hz triggers. **IMPORTANT: to move the bunchtrain to the desired starting point the DELAY in the expert panel (see below) has to be used. The Trigger in the user panel (see above) has to be set to 0 !!!**
93 +[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger2k.png~|~|alt="mtcatrigger2k.png" width="607" height="458"~]~]>>attach:mtcatrigger2k.png]]
92 92  
93 -here an example definging the bunch pattern for FLASH1 to mask 1
95 +here an example defining the bunch pattern for FLASH1 to mask 1
94 94  
95 95  \\
96 96  
97 -[[here is a link to the old VME trigger system>>doc:FLASHUSER.VMETrigger]]
99 +[[here is a link to the old VME trigger system>>doc:FLASH.VMETrigger]]