Wiki source code of Manual for the new rotational fast shutters (FS2 @ BL and FS3 @ PG)
Last modified by toleikis on 2022/09/28 17:23
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1.1 | 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) | ||
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2.1 | 9 | ** [[Details>>doc:||anchor="Details"]] |
| 10 | ** [[Design and setup>>doc:||anchor="Design and setup"]] | ||
| 11 | ** [[Controls>>doc:||anchor="Controls"]] | ||
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3.1 | 12 | ** [[States and signals>>doc:||anchor="States and signals"]] Work in Progress |
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1.1 | 13 | |
| 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 == | ||
| 27 | |||
| 28 | * FS2_3 3D CAD drawing: | ||
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3.1 | 29 | |
| 30 | [[image:attach:FS2_3_CAD_3D.png||height="400"]] | ||
| 31 | \\ | ||
| 32 | |||
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1.1 | 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) | ||
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4.1 | 46 | ** FS3(PG): hasffs03 (131.169.38.77), connected to network jack: 155.722 (location: gallery Rack 4) |
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1.1 | 47 | ** Both SPS are located beneath the shutters in the BDA area |
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3.1 | 49 | == States and signal Work in Progress == |