Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 29.1
edited by sndueste
on 2023/04/28 11:02
Change comment: There is no comment for this version
To version 19.1
edited by sndueste
on 2020/01/23 09:29
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -5,16 +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 9 ns steps, One can choose between 10 Hz triggers, Triggers connected to the (fast) FEL shutters,  frequencies locked to the pulses (e.g. 1MHz) and the actual bunch patterns. A detailed description can be found at the[[ N.A.T. webpage >>url:https://nateurope.com/product/namc-pstimer/||shape="rect"]].
8 +The MTCA based triggers have a jitter in the few ps range, the delay can be shifted in 9 ns steps, One can choose between 10 Hz triggers, Triggers connected to the (fast) FEL shutters,  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:
11 11  
12 12  * the triggers are for low impedance (~~50 Ohm )
13 -* signal level is:
14 -** + 3 V to + 4.5V  for high (actual trigger)  and  0V for low (baseline) at 50 Ohm
15 -** + 6 V to + 9V  for high  and  0V for low at 1 MOhm
16 -** one can also invert the signal in the expert panel ( thus the base line is + (3-5) V and the actual trigger signal is  0V)
17 -* The trigger are send to the MTCA several ms before the first FEL pulse (3.1 ms for the "standard" trigger, 21.5 ms for the "early" trigger).
13 +* signal level is + 5V - otherwise 0V (in the expert panel one can also invert the signal - base line is +5 V and trigger 0V)
14 +* The trigger are send to the MTCA several ms before the first FEL pulse (3.1 ms for the "standard" trigger, 23 ms for the "early" trigger).
18 18  * The timer card can delay the trigger in 9 ns  steps for more than 100 ms (an option to shift the trigger in 1 ns steps is available in the expert panel)
19 19  * The shown delay in µs is in respect to the //first// FEL pulse. negative delay: trigger comes before FEL, positive : trigger comes after the FEL.
20 20  * The desired delay has to be entered in the "delay to be set" field and as second step pressing the "set delay" sends the delay value to the timer card. Then the trigger delay will be changed and the "actual delay" will be updated.
... ... @@ -28,31 +28,93 @@
28 28  
29 29  \\
30 30  
31 -[[image:attach:image2020-1-23_12-10-59.png||width="700"]]
28 +\\
32 32  
33 33  \\
34 34  
35 35  \\
36 36  
37 -Choosing a FLASH1 trigger there are 2 options to be synchronized with the BL and the PG shutter :
34 +\\
38 38  
39 - [[image:attach:image2020-1-23_12-29-40.png||height="250"]]
36 +\\
40 40  
41 -A yellow background indicates that the trigger is synchronized to a fast shutter:
38 += Different trigger events (starting points) =
42 42  
43 -[[image:attach:image2020-1-23_12-31-41.png||height="250"]] or:[[image:attach:image2020-1-23_12-32-20.png||height="250"]]
40 +one can configure each channel for an individual trigger event
44 44  
42 +**FLASH1**
43 +
44 +(% class="wrapped" %)
45 +|(((
46 +trigger No
47 +)))|(((
48 +function
49 +)))
50 +|(((
51 +16
52 +)))|(((
53 +the MCA trigger 3.11 ms before the Flash1 pulses (same as A6 but more stable)
54 +)))
55 +|(((
56 +166
57 +)))|(((
58 +A6 event. still possible to use but less precise than 16
59 +)))
60 +|(((
61 +162
62 +)))|(((
63 +A2 event as earliest ( 24 ms before the FEL)
64 +)))
65 +|(((
66 +224
67 +)))|(((
68 +E0 event of the BL fast shutter ( 19 ms before the FEL)
69 +)))
70 +|(((
71 +225
72 +)))|(((
73 +E1 event of the PG fast shutter ( 19 ms before the FEL)
74 +)))
75 +|(((
76 +21
77 +)))|(((
78 +Trig16 + first bunch of FLASH1 - this trigger is shifted when FL1 starts later than "700"
79 +)))
80 +
45 45  \\
46 46  
47 47  \\
48 48  
85 +**FLASH2**
86 +
87 +(% class="wrapped" %)
88 +|(((
89 +trigger No
90 +)))|(((
91 +function
92 +)))
93 +|(((
94 +22
95 +)))|(((
96 +Trig116 + first bunch of FLASH2 - this trigger is shifted when FL2 starts at a different start time
97 +)))
98 +|(((
99 +181
100 +)))|(((
101 +shifts with the start time of FLASH2 as event 22 but comes 22 ms ! before the FEL
102 +)))
103 +
104 +from this trigger as starting point one can shift the timing in 9 ns steps first and finally in 0.9 ns steps for fine adjustment.
105 +
49 49  \\
50 50  
108 +\\
109 +
51 51  = Expert panels =
52 52  
53 53  \\
54 54  
55 -[[image:attach:image2020-1-23_12-28-6.png||height="250"]] [[image:attach:image2019-9-17_13-8-46.png||height="400"]]
114 +[[image:attach:image2019-9-17_13-10-56.png||height="250"]] [[image:attach:image2019-9-17_13-8-46.png||height="400"]]
56 56  
57 57  With the **"Expert overview"** one gets the overview over all channels available on the timing card and can configure the card. This is useful to look what channels are using clock settings or burst mode settings that one wants to change ... and using the other tabs one can set parameters for clocks and bursts (see below)
58 58  
... ... @@ -60,7 +60,7 @@
60 60  
61 61  For each trigger channel there is in addition an **"Expert panel"** to set the properties of THIS channel
62 62  
63 -[[image:attach:image2020-1-23_12-28-46.png||height="250"]] [[image:attach:image2019-9-17_13-15-38.png||width="550"]]
122 +[[image:attach:image2019-9-17_13-14-52.png||height="250"]] [[image:attach:image2019-9-17_13-15-38.png||width="550"]]
64 64  
65 65  \\
66 66  
... ... @@ -220,115 +220,14 @@
220 220  
221 221  \\
222 222  
223 -= Different trigger events (starting points) =
224 -
225 -one can configure each channel for an individual trigger event
226 -
227 -**FLASH1**
228 -
229 -(% class="wrapped" %)
230 -|(((
231 -trigger No
232 -)))|(((
233 -function
234 -)))
235 -|(% colspan="1" %)(((
236 -21
237 -)))|(% colspan="1" %)(((
238 -Trig16 + first bunch of FLASH1 - this trigger is shifted when FL1 starts later than "700"
239 -)))
240 -|(% colspan="1" %)(((
241 -180
242 -)))|(% colspan="1" %)(((
243 -shifts with the start time of FLASH1 as event 21 but comes 23 ms  before the FEL
244 -)))
245 -|(((
246 -16
247 -)))|(((
248 -the MCA trigger 3.11 ms before the Flash1 pulses (same as A6 but more stable)
249 -)))
250 -|(((
251 -166
252 -)))|(((
253 -A6 event. still possible to use but less precise than 16
254 -)))
255 -|(((
256 -162
257 -)))|(((
258 -A2 event as earliest ( 24 ms before the FEL)
259 -)))
260 -|(((
261 -224
262 -)))|(((
263 -E0 event of the BL fast shutter ( 19 ms before the FEL) - to be switched off in 2020
264 -)))
265 -|(((
266 -225
267 -)))|(((
268 -E1 event of the PG fast shutter ( 19 ms before the FEL) - to be switched off in 2020
269 -)))
270 -
271 271  \\
272 272  
273 273  \\
274 274  
275 -**FLASH2**
276 -
277 -(% class="wrapped" %)
278 -|(((
279 -trigger No
280 -)))|(((
281 -function
282 -)))
283 -|(((
284 -22
285 -)))|(((
286 -Trig116 + first bunch of FLASH2 - this trigger is shifted when FL2 starts at a different start time
287 -)))
288 -|(((
289 -181
290 -)))|(((
291 -shifts with the start time of FLASH2 as event 22 but comes 23 ms  before the FEL
292 -)))
293 -
294 -from this trigger as starting point one can shift the timing in 9 ns steps first and finally in 0.9 ns steps for fine adjustment.
295 -
296 296  \\
297 297  
298 298  \\
299 299  
300 -= Info about the Fast shutter trigger =
301 -
302 -Since Jan 2020 the fast shutter trigger at FLASH1 is generated via local inhibit at the EXP1 and EXP2 crate and not via E0 and E1 events anymore
303 -
304 -for details see [[doc:FLASH.Fast Shutter trigger inhibit system]]
305 -
306 306  \\
307 307  
308 -== Special trigger options for the fast shutter: ==
309 -
310 -=== Fast shutter inhibit signal ===
311 -
312 -It is possible to have the fast shutter inhibit signal (the signal coming from the fast shutter to the inhibit boxes connected to the X2 cards) directly available for users. For this one can select the output source as 2nd channel:
313 -
314 -[[image:attach:image2020-2-5_10-59-41.png||height="250"]]
315 -
316 316  \\
317 -
318 -=== Inverse fast shutter trigger ===
319 -
320 -If one wants to have an inverse fast shutter trigger (10 Hz signal that comes only if the fast shutter is** CLOSED**) one can use a T and a small Lemo cable to double the input from the fast shutter  to another input at the inhibit box.
321 -
322 -In the FL2 case input1 is the regular fast shutter channel and input2 is usually not used. for this additional input one can set the input configuration to **inverse:**
323 -
324 -[[image:attach:image2020-2-5_14-11-55.png||height="400"]]
325 -
326 -\\
327 -
328 -\\
329 -
330 -\\
331 -
332 -\\
333 -
334 -\\