Changes for page Trigger Howto

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...	...	@@ -5,82 +5,46 @@
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 1 ns steps (over many ms), one can choose between 10 Hz triggers, 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]].
	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		-in short: the triggers are for low impedance (~~50 OHM terminated ?? ), 5V triggers with an adjustable width. The main control panel for the x2 timer has the control options for the 3 front modules (connected with a RJ45 cable - connecting to a "trigger box" with 2 trigger exits (Lemo) each) and 8 Lemo exits at the back of the crate. in the BL-beamline case these triggers are connected to the BNC (patch panel) ports at the rack.
	10	+In short:
11	11
12		-The main control can be done with a simplified user panel which can handle the timing in respect to the FEL pulses and not in respect to some (arbitrary) reference time ( Event)[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/Trigger_scheme.gif~|~|alt="Trigger_scheme.gif" width="800"~]~]>>attach:Trigger_scheme.gif]]
	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).
	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	+* 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	+* 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.
	21	+* The trigger can be set to only provide a trigger signal if the FEL Fast shutter is open. One has to choose which FEL shutter to use.
	22	+* The trigger  width can be adjusted from 9 ns to several ms in 9 ns steps
	23	+* The timer card can in addition to the 10 Hz triggers also provide frequencies which are linked to the FEL repetition rate and the actual burst pattern of the FEL. For details how to set these modes see below
	24	+* At the beamlines the triggers are provided with a  BNC patch panel
13	13
	26	+The main control can be done with a simplified user panel which can handle the timing in respect to the FEL pulses (and not in respect to some arbitrary event time)
14	14
	28	+
15	15	\\
16	16
17		-= Different trigger events (starting points) =
	31	+[[image:attach:image2020-1-23_12-10-59.png||width="700"]]
18	18
19		-one can configure each channel for an individual trigger event
	33	+\\
20	20
21		-**FLASH1**
	35	+\\
22	22
23		-(% class="wrapped" %)
24		-|(((
25		-trigger No
26		-)))|(((
27		-function
28		-)))
29		-|(((
30		-16
31		-)))|(((
32		-the MCA trigger 3.11 ms before the Flash1 pulses (same as A6 but more stable)
33		-)))
34		-|(((
35		-166
36		-)))|(((
37		-A6 event. still possible to use but less precise than 16
38		-)))
39		-|(((
40		-162
41		-)))|(((
42		-A2 event as earliest ( 24 ms before the FEL)
43		-)))
44		-|(((
45		-224
46		-)))|(((
47		-E0 event of the BL fast shutter ( 19 ms before the FEL)
48		-)))
49		-|(((
50		-225
51		-)))|(((
52		-E1 event of the PG fast shutter ( 19 ms before the FEL)
53		-)))
54		-|(((
55		-21
56		-)))|(((
57		-Trig16 + first bunch of FLASH1 - this trigger is shifted when FL1 starts later than "700"
58		-)))
	37	+Choosing a FLASH1 trigger there are 2 options to be synchronized with the BL and the PG shutter :
59	59
60		-\\
	39	+ [[image:attach:image2020-1-23_12-29-40.png||height="250"]]
61	61
62		-\\
	41	+A yellow background indicates that the trigger is synchronized to a fast shutter:
63	63
64		-**FLASH2**
	43	+[[image:attach:image2020-1-23_12-31-41.png||height="250"]] or:[[image:attach:image2020-1-23_12-32-20.png||height="250"]]
65	65
66		-(% class="wrapped" %)
67		-|(((
68		-trigger No
69		-)))|(((
70		-function
71		-)))
72		-|(((
73		-22
74		-)))|(((
75		-Trig116 + first bunch of FLASH2 - this trigger is shifted when FL2 starts at a different start time
76		-)))
77		-|(((
78		-181
79		-)))|(((
80		-shifts with the start time of FLASH2 as event 22 but comes 22 ms ! before the FEL
81		-)))
	45	+\\
82	82
83		-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.
	47	+\\
84	84
85	85	\\
86	86
...	...	@@ -88,7 +88,7 @@
88	88
89	89	\\
90	90
91		-[[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"]]
92	92
93	93	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)
94	94
...	...	@@ -96,14 +96,12 @@
96	96
97	97	For each trigger channel there is in addition an **"Expert panel"** to set the properties of THIS channel
98	98
99		-[[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"]]
100	100
101	101	\\
102	102
103	103	\\
104	104
105		-\\
106		-
107	107	= Set a constant frequency to a channel =
108	108
109	109	=
...	...	@@ -153,30 +153,64 @@
153	153
154	154	\\
155	155
	118	+== General FLASH frequencies: ==
	119	+
156	156	\\
157	157
	122	+(% class="relative-table wrapped" style="width: 19.422%;" %)
	123	+|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
	124	+(% style="color: rgb(0,0,0);" title="" %)**Name
	125	+**
	126	+)))|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
	127	+(% style="color: rgb(0,0,0);" title="" %)**Frequency
	128	+**
	129	+)))|(% class="highlight-grey" title="Hintergrundfarbe : Grau" data-highlight-colour="grey" %)(((
	130	+(% style="color: rgb(0,0,0);" title="" %)**Divider**
	131	+)))
	132	+|(((
	133	+1.3 GHz
	134	+)))|(((
	135	+1300.000000 MHz
	136	+)))|(((
158	158	\\
	138	+)))
	139	+|(((
	140	+108 MHz
	141	+)))|(((
	142	+108.333333 MHz
	143	+)))|(((
	144	+12
	145	+)))
	146	+|(((
	147	+9 MHz
	148	+)))|(((
	149	+9.02777777 MHz
	150	+)))|(((
	151	+144
	152	+)))
	153	+|(((
	154	+4.5 MHz
	155	+)))|(((
	156	+4.513888 MHz
	157	+)))|(((
	158	+288
	159	+)))
	160	+|(((
	161	+1 MHz
	162	+)))|(((
	163	+1.003086 MHz
	164	+)))|(((
	165	+1296
	166	+)))
159	159
160	160	\\
161	161
162	162	Once a clock is configured with the right frequency one can choose in the "expert panel" of the according channel the "FPGA clock" in the "input source select"  chooser.
163	163
164		-\\
165		-
166		-\\
167		-
168		-\\
169		-
170	170	One has to set the delay to values less than the repetition rate ... (so for 1 MHz between 0 and 990 µs)  and the trigger width also less than the rep rate ...
171	171
172		-\\
	174	+This results in a continuous train of pulses with the set trigger width.
173	173
174		-\\
175		-
176		-\\
177		-
178		-This results in a continuous train of pulses with the set trigger width :
179		-
180	180	= Creating an (own) burst trigger =
181	181
182	182	One can use now a SECOND trigger channel which is set to a regular 10 Hz trigger  and gate the clock output to create a burst with defined start point and length,
...	...	@@ -218,20 +218,121 @@
218	218
219	219	\\
220	220
221		-[[image:attach:image2019-9-17_14-52-27.png||height="248"]][[image:attach:image2019-9-17_14-52-40.png||height="250"]]
	217	+[[image:attach:image2019-9-17_15-4-47.png||height="250"]][[image:attach:image2019-9-17_14-52-40.png||height="250"]]
222	222
223	223	\\
224	224
225	225	\\
226	226
	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	+
227	227	\\
228	228
229	229	\\
230	230
	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	+
231	231	\\
232	232
233	233	\\
234	234
	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	+
235	235	\\
236	236
	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	+
237	237	\\
	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	+\\