Changes for page Trigger Howto

Last modified by sndueste on 2023/07/07 11:28
From version 7.1
edited by sndueste
on 2019/09/17 13:44
Change comment: There is no comment for this version
To version 5.1
edited by sndueste
on 2019/08/22 16:02
Change comment: There is no comment for this version

Summary

Details

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Content
... ... @@ -1,22 +1,24 @@
1 +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]].
1 1  
3 +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.
2 2  
3 -{{toc/}}
5 +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]]
4 4  
5 -= Introduction =
6 6  
7 -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 +\\
8 8  
9 -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 +there is a more advanced control panel (by MCS4) to change more subtle parameters:
10 10  
11 -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 +\\
12 12  
13 13  
14 14  \\
15 15  
16 -= different trigger events (starting points) =
17 17  
18 -one can configure each channel for an individual trigger event
18 +[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger3k.png~|~|alt="mtcatrigger3k.png" width="608" height="461"~]~]>>attach:mtcatrigger3k.png]]
19 19  
20 +one can configure each channel for a trigger event
21 +
20 20  **FLASH1**
21 21  
22 22  (% class="wrapped" %)
... ... @@ -76,82 +76,16 @@
76 76  |(((
77 77  181
78 78  )))|(((
79 -shifts with the start time of FLASH2 as event 22 but comes 22 ms ! before the FEL
81 +shifts with thestart time of FLASH2 as event 22 but comes 22 ms ! before the FEL
80 80  )))
81 81  
82 82  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.
83 83  
84 -\\
85 85  
86 -= Expert panels =
87 +[[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger1.png~|~|alt="mtcatrigger1.png" width="811" height="532"~]~]>>attach:mtcatrigger1.png]]
87 87  
88 88  \\
89 89  
90 -[[image:attach:image2019-9-17_13-10-56.png||height="250"]] [[image:attach:image2019-9-17_13-8-46.png||height="400"]]
91 -
92 -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)
93 -
94 -\\
95 -
96 -For each trigger channel there is in addition an **"Expert panel"** to set the properties of THIS channel
97 -
98 -[[image:attach:image2019-9-17_13-14-52.png||height="250"]] [[image:attach:image2019-9-17_13-15-38.png||width="550"]]
99 -
100 -\\
101 -
102 -\\
103 -
104 -\\
105 -
106 -= Set a constant frequency to a channel
107 -[[image:attach:image2019-9-17_13-18-9.png||height="250"]][[image:attach:image2019-9-17_13-18-37.png||height="149"]] =
108 -
109 -\\
110 -
111 -\\
112 -
113 -The timer card provides the option to generate  frequencies that are synched to the FEL reprate on the ps level. One can set 3 Clocks by deviding the reference frequency of 54.2 MHz by n.** Please check (using the Expert overview ) before changing a frequency of it is used for some other channel !!**
114 -
115 -Since our main FEL frequency is 100.31 MHz the dividers are not straight forward:
116 -
117 -(% class="wrapped" %)
118 -|=(((
119 -Clock frequency
120 -)))|=(((
121 -Divider to be set
122 -)))
123 -|(((
124 -"1 MHz" (1000.31 kHz)
125 -)))|(((
126 -53
127 -)))
128 -|(((
129 -"500 kHz" (501.5 kHz)
130 -)))|(((
131 -107
132 -)))
133 -|(((
134 -"250 kHz" (250.8 kHz)
135 -)))|(((
136 -215
137 -)))
138 -|(% colspan="1" %)(((
139 -"200 kHz" (200.6 kHz)
140 -)))|(% colspan="1" %)(((
141 -269
142 -)))
143 -|(% colspan="1" %)(((
144 -"100 kHz" (100.3 kHz)
145 -)))|(% colspan="1" %)(((
146 -539
147 -)))
148 -
149 -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.
150 -
151 -\\
152 -
153 -\\
154 -
155 155  * in order to generate a stable frequency one has to set the input source to FPGA clock (and use dividers to get the desired frequency)
156 156  * to generate the burst patterns of the FEL one has to choose a trigger event (best 116 for FLASH 2 and 16 for FLASH1) and activate Destination 1 for FLASH1 and Destination 2 for FLASH2 . finally one has to assign the activated Bunch pattern mask to the trigger channel of choice . now the pattern can be shifted and the trigger width can be changed as with the 10 Hz triggers. **IMPORTANT: to move the bunchtrain to the desired starting point the DELAY in the expert panel (see below) has to be used. The Trigger in the user panel (see above) has to be set to 0 !!!**
157 157  [[~[~[image:url:http://hasfweb.desy.de/pub/Setup/TriggerHowto/mtcatrigger2k.png~|~|alt="mtcatrigger2k.png" width="607" height="458"~]~]>>attach:mtcatrigger2k.png]]