Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 17.1
edited by sndueste
on 2020/01/21 13:04
Change comment: There is no comment for this version
To version 11.1
edited by sndueste
on 2019/09/17 14:56
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -5,13 +5,13 @@
5 5  = Introduction (user panel)
6 6   =
7 7  
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]] ([[Design Paper>>url:http://ttfinfo2.desy.de/doocs/Timing/CDRv2.2short.pdf||shape="rect"]]).
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  
10 10  in short: the triggers are for low impedance (~~50 OHM terminated ?? ), 5V triggers with an adjustable width. The main control panel 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 panel) ports at the rack.
11 11  
12 -The main control can be done with a simplified user panel which can handle the timing in respect to the FEL pulses and not in respect to some (arbitrary) reference time ( Event)
12 +The main control can be done with a simplified user panel which can handle 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]]
13 13  
14 -[[image:attach:Trigger_scheme.gif]]
14 +
15 15  \\
16 16  
17 17  = Different trigger events (starting points) =
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102 102  
103 103  \\
104 104  
105 +\\
106 +
105 105  = Set a constant frequency to a channel =
106 106  
107 107  =
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151 151  
152 152  \\
153 153  
154 -== General FLASH frequencies: ==
155 -
156 156  \\
157 157  
158 -(% class="relative-table wrapped" style="width: 19.422%;" %)
159 -|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
160 -(% style="color: rgb(0,0,0);" title="" %)**Name**
161 -)))|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
162 -(% style="color: rgb(0,0,0);" title="" %)**Frequency**
163 -)))|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
164 -(% style="color: rgb(0,0,0);" title="" %)**Divider**
165 -)))
166 -|(((
167 -1.3 GHz
168 -)))|(((
169 -1300.000000 MHz
170 -)))|(((
171 171  \\
172 -)))
173 -|(((
174 -108 MHz
175 -)))|(((
176 -108.333333 MHz
177 -)))|(((
178 -12
179 -)))
180 -|(((
181 -9 MHz
182 -)))|(((
183 -9.02777777 MHz
184 -)))|(((
185 -144
186 -)))
187 -|(((
188 -4.5 MHz
189 -)))|(((
190 -4.513888 MHz
191 -)))|(((
192 -288
193 -)))
194 -|(((
195 -1 MHz
196 -)))|(((
197 -1.003086 MHz
198 -)))|(((
199 -1296
200 -)))
201 201  
202 202  \\
203 203  
204 204  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.
205 205  
164 +\\
165 +
166 +\\
167 +
168 +\\
169 +
206 206  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 ...
207 207  
208 -This results in a continuous train of pulses with the set trigger width.
172 +\\
209 209  
174 +\\
175 +
176 +\\
177 +
178 +This results in a continuous train of pulses with the set trigger width :
179 +
210 210  = Creating an (own) burst trigger =
211 211  
212 212  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,
... ... @@ -238,7 +238,7 @@
238 238  
239 239  There are 6 different bunch pattern "channels" one can configure. Typically only 2 are needed ... And in each one there are 6 selectors to choose sources . We only need one - it does not matter in which one is used.
240 240  
241 -[[~[~[image:attach:image2019-9-17_14-51-28.png~|~|height="250"~]~]>>attach:image2019-9-17_14-51-28.png]][[image:attach:image2019-9-17_14-47-15.png||thumbnail="true" height="199"]]
211 +[[image:attach:image2019-9-17_14-51-28.png||height="250"]][[image:attach:image2019-9-17_14-47-15.png||thumbnail="true" height="199"]]
242 242  
243 243  \\
244 244  
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248 248  
249 249  \\
250 250  
251 -[[image:attach:image2019-9-17_15-4-47.png||height="250"]][[image:attach:image2019-9-17_14-52-40.png||height="250"]]
221 +[[image:attach:image2019-9-17_14-52-27.png||height="248"]][[image:attach:image2019-9-17_14-52-40.png||height="250"]]
252 252  
253 253  \\
254 254