Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 7.1
edited by sndueste
on 2019/09/17 13:44
Change comment: There is no comment for this version
To version 10.1
edited by sndueste
on 2019/09/17 14:29
Change comment: There is no comment for this version

Summary

Details

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Content
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2 2  
3 3  {{toc/}}
4 4  
5 -= Introduction =
5 += Introduction (user panel)
6 + =
6 6  
7 7  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 detailed description can be found in [[x2Timer manual>>attach:x2Timer.pdf]].
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13 13  
14 14  \\
15 15  
16 -= different trigger events (starting points) =
17 += Different trigger events (starting points) =
17 17  
18 18  one can configure each channel for an individual trigger event
19 19  
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103 103  
104 104  \\
105 105  
106 -= Set a constant frequency to a channel
107 += Set a constant frequency to a channel =
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109 +=
107 107  [[image:attach:image2019-9-17_13-18-9.png||height="250"]][[image:attach:image2019-9-17_13-18-37.png||height="149"]] =
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109 109  \\
110 110  
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112 -
113 113  The timer card provides the option to generate  frequencies that are synched to the FEL reprate on the ps level. One can set 3 Clocks by deviding the reference frequency of 54.2 MHz by n.** Please check (using the Expert overview ) before changing a frequency of it is used for some other channel !!**
114 114  
115 115  Since our main FEL frequency is 100.31 MHz the dividers are not straight forward:
116 116  
118 +[[image:attach:image2019-9-17_14-22-29.png||width="450" align="right"]]
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120 +\\
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117 117  (% class="wrapped" %)
118 118  |=(((
119 119  Clock frequency
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146 146  539
147 147  )))
148 148  
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149 149  Once a clock is configured with the right frequency one can choose in the "expert panel" of the according channel the "FPGA clock" in the "input source select"  chooser.
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152 152  
153 153  \\
154 154  
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170 +One has to set the delay to values less than the repetition rate ... (so for 1 MHz between 0 and 990 µs)  and the trigger width also less than the rep rate ...
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178 +This results in a continuous train of pulses with the set trigger width :
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180 += Creating an (own) burst trigger =
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182 +One can use now a SECOND trigger channel which is set to a regular 10 Hz trigger  and gate the clock output to create a burst with defined start point and length,
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155 155  * 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)
156 156  * 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 !!!**
157 157  [[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger2k.png~|~|alt="mtcatrigger2k.png" width="607" height="458"~]~]>>attach:mtcatrigger2k.png]]
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160 160  
161 161  \\
162 162  
163 -[[here is a link to the old VME trigger system>>doc:FLASH.VMETrigger]]
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