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 24.1
edited by sndueste
on 2020/02/05 09:07
Change comment: There is no comment for this version

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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)
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)
17 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).
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.
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305 305  
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  \\
317 317  
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 -
326 326  \\
327 327  
328 328  \\
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330 330  \\
331 331  
332 332  \\
333 -
334 -\\