Last modified by toleikis on 2022/09/28 17:23
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1 The new rotating fast shutters are able to select single pulses (or pulse trains if in multi-bunch mode) out of the generic 10 Hz repetition rate of the FLASH machine.
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3 The rotating shutter consists of a thin aluminium (forseen was glassy carbon) disk which contains an outer trace with 6 equidistant slits. The disk is driven by a DC-motor outside the vacuum. A magnetic rotary feedthrough carries the motion of the motor into the vacuum. A programmable logic controller (PLC; programming done by Jan Tolkiehn) is used to control the system including a low-voltage DC-motor with rotary encoder and a planar light barrier. To pass a pulse through the shutter, the motor is triggered to rotate when one pulse hits the shutter. During the following 100 ms, the motor rotates the shutter disk by 30°, leading to a movement to the fully open position, thus allowing the passage of the following pulse. During the next 100 ms the rotation is continued to the 60° position, thus blocking the next pulse by turning the disk to the fully closed position.
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6 (% class="twikiTocTitle" %)Contents:
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8 * Manual for the new rotational fast shutters (FS2 @ BL and FS3 @ PG)
9 ** [[Details>>doc:||anchor="Details"]]
10 ** [[Design and setup>>doc:||anchor="Design and setup"]]
11 ** [[Controls>>doc:||anchor="Controls"]]
12 ** [[States and signals>>doc:||anchor="States and signals"]] Work in Progress
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14 \\
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16 == Details ==
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18 * able to open/close within 100 ms
19 * uses machine bunch train trigger (10 Hz) to sync with the machine
20 * feedback on angular motor position and light barrier signal available
21 * simple open/close mode and feeback signals (via (% class="twikiNewLink" %)DOOCS, jddd-Panel(%%))
22 * open/close mode, single shot mode, chopper mode, direct control of angular position, and feedback signals (via (% class="twikiNewLink" %)LabVIEW(%%) from the //hasfuser03 //PC)
23 * external single shot trigger mode (via TTL or 5V signal, over the patchpannels)
24 * trigger signal when fast shutter is open available at beamline crates (event **//E0//** for BL shutter, event **//E1//** for the PG shutter)
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26 == Design and setup ==
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28 * FS2_3 3D CAD drawing:
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30 [[image:attach:FS2_3_CAD_3D.png||height="400"]]
31 \\
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33 * Design details:
34 ** chopper wheel (aluminium, thickness:0.5 mm): diameter 182 mm, 6 equally distributed slits with an opening angle of 18° and a slit depth of 38 mm (-> slit width in the middle: ~~22.7 mm)
35 ** CF200 flanges
36 ** magnetic rotational feedthrough (MD35 from Vacom)
37 ** DC motor (Maxon RE40 with GP42 planetary gearing)
38 ** laser light barrier: beam size: width 35 mm; height: 2 mm; detector output: 0-10 V
39 * Shutter FS2 (BL branch) is located directly in front of the old shutter FS1 and behind the VLS mirror chamber in the BDA area.
40 * Shutter FS3 (PG branch) is located behind the PG0-M1 mirror chamber in the BDA area.
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42 == Controls ==
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44 * SPS control details:
45 ** FS2(BL): hasffs02 (131.169.38.74), connected to network jack: 28c-Halle-105-L (location: BDA area, on the right side, at the PETRA III ring wall)
46 ** FS3(PG): hasffs03 (131.169.38.77), connected to network jack: 155.722 (location: gallery Rack 4)
47 ** Both SPS are located beneath the shutters in the BDA area
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49 == States and signal  Work in Progress ==