Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 11.1
edited by sndueste
on 2019/09/17 14:56
Change comment: There is no comment for this version
To version 18.1
edited by sndueste
on 2020/01/21 13:04
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]].
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"]]).
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)[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/Trigger_scheme.gif~|~|alt="Trigger_scheme.gif" width="800"~]~]>>attach:Trigger_scheme.gif]]
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)
13 13  
14 -
14 +[[image:attach:Trigger_scheme.gif]]
15 15  \\
16 16  
17 17  = Different trigger events (starting points) =
... ... @@ -102,8 +102,6 @@
102 102  
103 103  \\
104 104  
105 -\\
106 -
107 107  = Set a constant frequency to a channel =
108 108  
109 109  =
... ... @@ -153,30 +153,64 @@
153 153  
154 154  \\
155 155  
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 +**
162 +)))|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
163 +(% style="color: rgb(0,0,0);" title="" %)**Frequency                
164 +**
165 +)))|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
166 +(% style="color: rgb(0,0,0);" title="" %)**Divider**
167 +)))
168 +|(((
169 +1.3 GHz
170 +)))|(((
171 +1300.000000 MHz
172 +)))|(((
158 158  \\
174 +)))
175 +|(((
176 +108 MHz
177 +)))|(((
178 +108.333333 MHz
179 +)))|(((
180 +12
181 +)))
182 +|(((
183 +9 MHz
184 +)))|(((
185 +9.02777777 MHz
186 +)))|(((
187 +144
188 +)))
189 +|(((
190 +4.5 MHz
191 +)))|(((
192 +4.513888 MHz
193 +)))|(((
194 +288
195 +)))
196 +|(((
197 +1 MHz
198 +)))|(((
199 +1.003086 MHz
200 +)))|(((
201 +1296
202 +)))
159 159  
160 160  \\
161 161  
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 -\\
165 -
166 -\\
167 -
168 -\\
169 -
170 170  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 ...
171 171  
172 -\\
210 +This results in a continuous train of pulses with the set trigger width.
173 173  
174 -\\
175 -
176 -\\
177 -
178 -This results in a continuous train of pulses with the set trigger width :
179 -
180 180  = Creating an (own) burst trigger =
181 181  
182 182  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,
... ... @@ -208,7 +208,7 @@
208 208  
209 209  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.
210 210  
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"]]
243 +[[~[~[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"]]
212 212  
213 213  \\
214 214  
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218 218  
219 219  \\
220 220  
221 -[[image:attach:image2019-9-17_14-52-27.png||height="248"]][[image:attach:image2019-9-17_14-52-40.png||height="250"]]
253 +[[image:attach:image2019-9-17_15-4-47.png||height="250"]][[image:attach:image2019-9-17_14-52-40.png||height="250"]]
222 222  
223 223  \\
224 224