Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 20.1
edited by sndueste
on 2020/01/23 12:15
Change comment: There is no comment for this version
To version 28.1
edited by sndueste
on 2023/04/28 10:58
Change comment: There is no comment for this version

Summary

Details

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Content
... ... @@ -5,13 +5,16 @@
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 -* 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).
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).
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.
... ... @@ -31,6 +31,14 @@
31 31  
32 32  \\
33 33  
37 +Choosing a FLASH1 trigger there are 2 options to be synchronized with the BL and the PG shutter :
38 +
39 + [[image:attach:image2020-1-23_12-29-40.png||height="250"]]
40 +
41 +A yellow background indicates that the trigger is synchronized to a fast shutter:
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"]]
44 +
34 34  \\
35 35  
36 36  \\
... ... @@ -41,7 +41,7 @@
41 41  
42 42  \\
43 43  
44 -[[image:attach:image2019-9-17_13-10-56.png||height="250"]] [[image:attach:image2019-9-17_13-8-46.png||height="400"]]
55 +[[image:attach:image2020-1-23_12-28-6.png||height="250"]] [[image:attach:image2019-9-17_13-8-46.png||height="400"]]
45 45  
46 46  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)
47 47  
... ... @@ -49,7 +49,7 @@
49 49  
50 50  For each trigger channel there is in addition an **"Expert panel"** to set the properties of THIS channel
51 51  
52 -[[image:attach:image2019-9-17_13-14-52.png||height="250"]] [[image:attach:image2019-9-17_13-15-38.png||width="550"]]
63 +[[image:attach:image2020-1-23_12-28-46.png||height="250"]] [[image:attach:image2019-9-17_13-15-38.png||width="550"]]
53 53  
54 54  \\
55 55  
... ... @@ -215,6 +215,7 @@
215 215  
216 216  **FLASH1**
217 217  
229 +(% class="wrapped" %)
218 218  |(((
219 219  trigger No
220 220  )))|(((
... ... @@ -262,6 +262,7 @@
262 262  
263 263  **FLASH2**
264 264  
277 +(% class="wrapped" %)
265 265  |(((
266 266  trigger No
267 267  )))|(((
... ... @@ -284,10 +284,32 @@
284 284  
285 285  \\
286 286  
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 +
287 287  \\
288 288  
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 +
289 289  \\
290 290  
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 +
291 291  \\
292 292  
293 293  \\