Wiki source code of BL0M0 screen system

Version 7.1 by sndueste on 2021/06/21 10:47
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sendels 1.1 1 = BL0M0 screen system =
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sndueste 7.1 3 **The BL0M0 beamblock and screen system was NEWLY installed June / July 2018 **
sendels 1.1 4 \\
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sendels 3.1 8 * [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
9 ** [[Beam block>>doc:||anchor="Beam block"]]
sendels 1.1 10 ** Screen / Ce:YAG
sendels 3.1 11 *** [[Crystal>>doc:||anchor="Crystal"]]
12 *** [[retraction>>doc:||anchor="retraction"]]
13 *** [[Beamprofile>>doc:||anchor="Beamprofile"]]
14 *** [[ROIs>>doc:||anchor="ROIs"]]
15 *** [[Expert Settings>>doc:||anchor="Expert Settings"]]
16 ** [[Reference Values for the camera>>doc:||anchor="Reference Values for the camera"]]
17 ** [[Details of the installation>>doc:||anchor="Details of the installation"]]
18 *** [[Motor>>doc:||anchor="Motor"]]
19 *** [[Crystal>>doc:||anchor="Crystal"]]
20 *** [[Iris>>doc:||anchor="Iris"]]
21 *** [[Camera>>doc:||anchor="Camera"]]
sendels 1.1 22
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25 Essentially the blocking of the FEL beam by the screen //and// the beam profile viewing have been separated. The beam block is operated as before "the screen" with the same buttons. To look on the beam profile a screen has to be moved in separately with the "move screen to PG / BL" buttons.
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27 Drawings by Svea:
sendels 6.1 28 Beam block and Crystal are moved out:
sendels 1.1 29
sendels 6.1 30 [[image:attach:BL0M0-image.jpg||height="250"]]
31 \\Beam block moved in and crystal in parking position between beam paths:
32
33 [[image:attach:BL0M0-image2.jpg||height="250"]]
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sendels 3.1 35 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 36
37 == Beam block ==
38
39 * **NOTE** the Beam block has the same functionality as the screen before. It is connected ( and can be operated via) the FLASH vacuum interlock as before. Thus if the Beamblock is **IN**, the FEL beam is blocked in the logic of the Interlock system
40 * The screen (YAG crystal)) is **NOT** in the interlock and can not be used to block the beam when in the interlock logic ... it is no block - it is only for looking at the beamprofile !!
41 * The Beamblock is controlled by the Vacuum SPS and moved via pneumatic
42 * DOOCS address: {{code language="none"}}TTF2.FEL/HASY.SCREEN/L0/{{/code}}
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sendels 3.1 44 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 45
46 == Screen / Ce:YAG ==
47
48 === Crystal ===
49
50 * Crystal and camera are mounted together on a linear motorized stage. Thus the crystal is always in the focus of the camera, however the Camera crystal combination has to be moved to the corresponding position in the beamline . Either to BL , PG or in the parking position ( named "out") between the BL and PG position.
51 * the red circle in the center has 5 mm diameter
sendels 3.1 52 * The camera is equipped with an Iris ( RASPI controlled P iris). for more details see [[here>>doc:FLASH.Iris Raspi info]]
sendels 1.1 53 * The Ce:YAG crystal is mounted at 45 deg to the beam and the camera, thus if the image is quadratic the beam should be round
54
55 The panel indicated if the crystal is in or out and provides always the buttons to move the buttons to the beamline which is set by M0 ( or to be moved out):
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sendels 6.1 57 [[image:attach:M0_screen_is_in.jpg.png||height="250"]]
sendels 1.1 58
sendels 6.1 59 \\
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sendels 3.1 61 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 62
63 === retraction ===
64
65 In order to protect the Ce YAG crystal from too much radiation, we implemented a system that retracts the crystal automatically after several minutes .
66 The idea is, that the crystal can be used for tuning and looking at the beam profile but **NOT as beamblock** (which is now a separate device). In order to avoid too much moving in and out of the crystal, there is a button (in the red warning box) which resets the timer. If the button is pressed the time window starts again and the crystal stays in ...
67 It is to note, that before the crystal is retracted automatically it checks if the beam block is in. If this is not the case, the beam block is moved in BEFORE the crystal is retracted ...
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sendels 6.1 69 [[image:attach:BL0Mo_retraction.jpg||height="250"]]
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sendels 1.1 71
sendels 3.1 72 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 73
74 === Beamprofile ===
75
76 There is also a beamprofile monitor available calculating the beam diameter and divergence (to be started from the upper panel button "Beamprofile") :
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sendels 6.1 78 [[image:attach:M0_beamprofile.jpg.png||height="250"]]
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sendels 3.1 80 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 81
82 === ROIs ===
83
84 Since there may be a somewhat different setting needed for the ROIs for BL and PG there is the option (in the expert settings) to set the ROIs different fror PG and BL. The move buttons also set the according ROIs ( moving to BL sets the BL ROIs...). It is also checked that the correct ROI is set when moving the screen . A warning is displayed if the ROI is not the same as in the reference values.
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sendels 3.1 86 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 87
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sendels 3.1 90 === Expert Settings ===
sendels 1.1 91
sndueste 4.1 92 detailed settings and restarting of the servers can be done by experts on the expert tab:
sendels 1.1 93
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sndueste 5.1 97 [[image:attach:BL0M0 expert.png||height="400"]]
sendels 1.1 98
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sendels 3.1 101 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 102
103 == Reference Values for the camera ==
104
105 Reference image for the camera settings
sndueste 5.1 106 [[image:attach:BL0M0 camera reference.png||height="400"]]:
sendels 1.1 107 The jddd panel also checks for these values otherwise an error message will be displayed
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sendels 3.1 109 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 110
sendels 3.1 111 == Details of the installation ==
sendels 1.1 112
113 Images of the setup::
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sendels 6.1 115 [[image:attach:20180712_142435.jpg||height="250"]]
116 \\
sendels 1.1 117
sendels 6.1 118 [[image:attach:20180712_142421.jpg||height="250"]]
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sendels 3.1 121 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 122
123 === Motor ===
124
125 * The motor driving camera and crystal is: mot37 at hasfmirr
126 * it is connected via patch panel PPBDA M11
127 * [[more details in this logbook entry~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:https://ttfinfo.desy.de/ExpHallelog/show.jsp?dir=/2018/27/05.07&pos=2018-07-05T16:06:25||shape="rect"]]
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sendels 3.1 129 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 130
131 === Crystal ===
132
133 * The Crystal is a 30 x 30 mm Ce:YAG crystal (0.2 mm thick) with a roughened Si scattering (0.6 mm thick) screen behind) mounted at 45 deg to the beam and the camera.
134 * Camera calibration: For x and for y we have 22 pixel per mm. Thus if the image is quadratic the beam should be round. The crystal is still not quadratic since we see the x dimension shrinked by sqrt(2).
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sendels 3.1 136 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 137
138 === Iris ===
139
140 * the Iris is controled by haskrpiris08 192.168.58.192
141 * it is connected to the plug "28c-Halle-106 rechts"
142 * up to now there is no remote power switch installed for the Raspy ... to come
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sendels 3.1 144 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]
sendels 1.1 145
146 === Camera ===
147
148 * The camera is a standard Basler acE 1300 gm
149 * The camera is mounted **upside down** thus the "rotation by 180 deg" has to be activated in the camera server
sendels 2.1 150 * the camera is connected via internal network to a 4 times (% class="twikiNewLink" %)PoE(%%) Switch on the gallery which is connected to hasvuvblfw1
sendels 1.1 151
sendels 3.1 152 BL0M0 image~:
sendels 1.1 153
sendels 6.1 154 [[image:attach:BL0M0.jpg||height="400"]]
155 \\
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sendels 1.1 157 The GUI and the HELP is still under development ... in case of confusion call Stefan Düsterer 91625
sendels 3.1 158
159 [[BL0M0 screen system>>doc:||anchor="BL0M0 screen system"]]