Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 19.1
edited by sndueste
on 2020/01/23 09:29
Change comment: There is no comment for this version
To version 27.1
edited by sndueste
on 2023/04/28 08:20
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 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"]]).
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"]].
9 9  
10 10  In short:
11 11  
12 12  * the triggers are for low impedance (~~50 Ohm )
13 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).
14 +* 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).
15 15  * 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)
16 16  * 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.
17 17  * 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.
... ... @@ -25,93 +25,31 @@
25 25  
26 26  \\
27 27  
28 -\\
28 +[[image:attach:image2020-1-23_12-10-59.png||width="700"]]
29 29  
30 30  \\
31 31  
32 32  \\
33 33  
34 -\\
34 +Choosing a FLASH1 trigger there are 2 options to be synchronized with the BL and the PG shutter :
35 35  
36 -\\
36 + [[image:attach:image2020-1-23_12-29-40.png||height="250"]]
37 37  
38 -= Different trigger events (starting points) =
38 +A yellow background indicates that the trigger is synchronized to a fast shutter:
39 39  
40 -one can configure each channel for an individual trigger event
40 +[[image:attach:image2020-1-23_12-31-41.png||height="250"]] or:[[image:attach:image2020-1-23_12-32-20.png||height="250"]]
41 41  
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 -
81 81  \\
82 82  
83 83  \\
84 84  
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 -
106 106  \\
107 107  
108 -\\
109 -
110 110  = Expert panels =
111 111  
112 112  \\
113 113  
114 -[[image:attach:image2019-9-17_13-10-56.png||height="250"]] [[image:attach:image2019-9-17_13-8-46.png||height="400"]]
52 +[[image:attach:image2020-1-23_12-28-6.png||height="250"]] [[image:attach:image2019-9-17_13-8-46.png||height="400"]]
115 115  
116 116  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)
117 117  
... ... @@ -119,7 +119,7 @@
119 119  
120 120  For each trigger channel there is in addition an **"Expert panel"** to set the properties of THIS channel
121 121  
122 -[[image:attach:image2019-9-17_13-14-52.png||height="250"]] [[image:attach:image2019-9-17_13-15-38.png||width="550"]]
60 +[[image:attach:image2020-1-23_12-28-46.png||height="250"]] [[image:attach:image2019-9-17_13-15-38.png||width="550"]]
123 123  
124 124  \\
125 125  
... ... @@ -279,14 +279,115 @@
279 279  
280 280  \\
281 281  
220 += Different trigger events (starting points) =
221 +
222 +one can configure each channel for an individual trigger event
223 +
224 +**FLASH1**
225 +
226 +(% class="wrapped" %)
227 +|(((
228 +trigger No
229 +)))|(((
230 +function
231 +)))
232 +|(% colspan="1" %)(((
233 +21
234 +)))|(% colspan="1" %)(((
235 +Trig16 + first bunch of FLASH1 - this trigger is shifted when FL1 starts later than "700"
236 +)))
237 +|(% colspan="1" %)(((
238 +180
239 +)))|(% colspan="1" %)(((
240 +shifts with the start time of FLASH1 as event 21 but comes 23 ms  before the FEL
241 +)))
242 +|(((
243 +16
244 +)))|(((
245 +the MCA trigger 3.11 ms before the Flash1 pulses (same as A6 but more stable)
246 +)))
247 +|(((
248 +166
249 +)))|(((
250 +A6 event. still possible to use but less precise than 16
251 +)))
252 +|(((
253 +162
254 +)))|(((
255 +A2 event as earliest ( 24 ms before the FEL)
256 +)))
257 +|(((
258 +224
259 +)))|(((
260 +E0 event of the BL fast shutter ( 19 ms before the FEL) - to be switched off in 2020
261 +)))
262 +|(((
263 +225
264 +)))|(((
265 +E1 event of the PG fast shutter ( 19 ms before the FEL) - to be switched off in 2020
266 +)))
267 +
282 282  \\
283 283  
284 284  \\
285 285  
272 +**FLASH2**
273 +
274 +(% class="wrapped" %)
275 +|(((
276 +trigger No
277 +)))|(((
278 +function
279 +)))
280 +|(((
281 +22
282 +)))|(((
283 +Trig116 + first bunch of FLASH2 - this trigger is shifted when FL2 starts at a different start time
284 +)))
285 +|(((
286 +181
287 +)))|(((
288 +shifts with the start time of FLASH2 as event 22 but comes 23 ms  before the FEL
289 +)))
290 +
291 +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.
292 +
286 286  \\
287 287  
288 288  \\
289 289  
297 += Info about the Fast shutter trigger =
298 +
299 +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
300 +
301 +for details see [[doc:FLASH.Fast Shutter trigger inhibit system]]
302 +
290 290  \\
291 291  
305 +== Special trigger options for the fast shutter: ==
306 +
307 +=== Fast shutter inhibit signal ===
308 +
309 +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:
310 +
311 +[[image:attach:image2020-2-5_10-59-41.png||height="250"]]
312 +
292 292  \\
314 +
315 +=== Inverse fast shutter trigger ===
316 +
317 +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.
318 +
319 +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:**
320 +
321 +[[image:attach:image2020-2-5_14-11-55.png||height="400"]]
322 +
323 +\\
324 +
325 +\\
326 +
327 +\\
328 +
329 +\\
330 +
331 +\\