Changes for page Trigger Howto
Last modified by sndueste on 2023/07/07 11:28
Summary
-
Page properties (1 modified, 0 added, 0 removed)
Details
- Page properties
-
- Content
-
... ... @@ -2,8 +2,7 @@ 2 2 3 3 {{toc/}} 4 4 5 -= Introduction (user panel) 6 - = 5 += Introduction = 7 7 8 8 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]]. 9 9 ... ... @@ -14,7 +14,7 @@ 14 14 15 15 \\ 16 16 17 -= Different trigger events (starting points) =16 += different trigger events (starting points) = 18 18 19 19 one can configure each channel for an individual trigger event 20 20 ... ... @@ -104,21 +104,17 @@ 104 104 105 105 \\ 106 106 107 -= Set a constant frequency to a channel = 108 - 109 -= 106 += Set a constant frequency to a channel 110 110 [[image:attach:image2019-9-17_13-18-9.png||height="250"]][[image:attach:image2019-9-17_13-18-37.png||height="149"]] = 111 111 112 112 \\ 113 113 111 +\\ 112 + 114 114 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 !!** 115 115 116 116 Since our main FEL frequency is 100.31 MHz the dividers are not straight forward: 117 117 118 -[[image:attach:image2019-9-17_14-22-29.png||width="450" align="right"]] 119 - 120 -\\ 121 - 122 122 (% class="wrapped" %) 123 123 |=((( 124 124 Clock frequency ... ... @@ -151,14 +151,6 @@ 151 151 539 152 152 ))) 153 153 154 -\\ 155 - 156 -\\ 157 - 158 -\\ 159 - 160 -\\ 161 - 162 162 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. 163 163 164 164 \\ ... ... @@ -165,36 +165,6 @@ 165 165 166 166 \\ 167 167 168 -\\ 169 - 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 ... 171 - 172 -\\ 173 - 174 -\\ 175 - 176 -\\ 177 - 178 -This results in a continuous train of pulses with the set trigger width : 179 - 180 -= Creating an (own) burst trigger = 181 - 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, 183 - 184 -\\ 185 - 186 -\\ 187 - 188 -\\ 189 - 190 -\\ 191 - 192 -\\ 193 - 194 -\\ 195 - 196 -\\ 197 - 198 198 * 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) 199 199 * 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 !!!** 200 200 [[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger2k.png~|~|alt="mtcatrigger2k.png" width="607" height="458"~]~]>>attach:mtcatrigger2k.png]] ... ... @@ -203,26 +203,4 @@ 203 203 204 204 \\ 205 205 206 -\\ 207 - 208 -\\ 209 - 210 -\\ 211 - 212 -\\ 213 - 214 -\\ 215 - 216 -\\ 217 - 218 -\\ 219 - 220 -\\ 221 - 222 -\\ 223 - 224 -\\ 225 - 226 -\\ 227 - 228 -\\ 163 +[[here is a link to the old VME trigger system>>doc:FLASH.VMETrigger]]