Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 25.1
edited by sndueste
on 2020/02/05 11:01
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

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... ... @@ -5,12 +5,15 @@
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)
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)
14 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.
... ... @@ -306,12 +306,20 @@
306 306  
307 307  === Fast shutter inhibit signal ===
308 308  
309 -Having the fast shutter inhibit signal directly available for users
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:
310 310  
314 +[[image:attach:image2020-2-5_10-59-41.png||height="250"]]
315 +
311 311  \\
312 312  
313 -[[image:attach:image2020-2-5_10-59-41.png||height="250"]]
318 +=== Inverse fast shutter trigger ===
314 314  
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 +
315 315  \\
316 316  
317 317  \\