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Image Acquisition in LCLS

This presentation discusses the advanced image acquisition systems used at the LCLS, focusing on various camera interfaces, including CameraLink, Ethernet, and Firewire. It explores specific applications such as injection laser stabilization, beam profile monitoring, and the requirements for resolution and frame rates. The session highlights data throughput capabilities using EPICS/RTEMS/MV6100 platforms and discusses the theoretical maximum throughput across different technologies. Attention is also given to camera choices, CCD sensitivities, and integration methods, showcasing the importance of robust and flexible image acquisition in scientific experiments.

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Image Acquisition in LCLS

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  1. Image Acquisition in LCLS Sheng Peng EPICS Meeting 2008, Shanghai

  2. Applications • We have many applications which need camera • Injection Laser Stabilization • Beam Profile Monitors: OTR/YAG • Experiments • Requirement • Resolution, Frame rate • CCD sensitivity/Dynamic rage • Thermal noise • Beam synced acquisition capability • Interface to control system • LCLS standard IOC platform is EPICS/RTEMS/MV6100

  3. Possible Data Throughput on MVME6100 • The data throughput may be very high • 640*480*2bytes/pixel*120Hz ~= 72MB/s • 1392*1040*2bytes/pixel*15Hz ~= 42MB/s • Theoretical maximum throughput • Giga-Ethernet: ~100MB/s • USB2.0: 60MB/s • Firewire 1394b: 100MB/s • 32-Bit 66MHz PCI: 264MB/s • 64-Bit 66MHz PCI: 528MB/s

  4. Possible Camera Interfaces • There are a few most popular interfaces in camera industry: • Cameralink (2.38Gbps for Base) • Ethernet (1Gbps) • LVDS(RS-644) (1.923Gbps) • USB2.0 (480Mbps) • Firewire (400Mbps/800Mbps) • Some decisions are easy: • Ethernet is attractive • Firewire is better than USB • More camera choices • Higher power • Less CPU involvement • RTEMS no USB stack • CameraLink is better than LVDS • CameraLink is serialized LVDS, so less wires • More popular

  5. Possible Camera Interfaces • The most of cameras we are using now are all CameraLink cameras so far • We have two methods to integrate Cameralink interface into our control system: • Ethernet • PMC Frame Grabber

  6. Ethernet Interface for Camera • As always, I love Ethernet. • But at that time, the choice we had was CameraLink to Ethernet converter. • Proprietary protocol, can’t get any info out from Pleora. Later on it turned to GigEVision. • Vendor driver works with particular Ethernet chip • Pleora and JAI PULNiX and another ten companies started GigEVision • We still need protocol/source code if we are not using Windows/Linux to interface to camera • Even now, CameraLink is probably more sophisticated.

  7. Profile Monitor Image Acquisition • UNIQ UP900CL-12B camera • CCD: 1/2” • Shutter: Full Frame • Resolution: 1392x1040 • Progressive: Yes • External Trigger: Yes • Full scan: 14.97Hz • Analog Output: Yes • Cameralink: Yes • EDT PMC DV C-Link • Cameralink compatible • 32bit/66MHz PCI • External trigger input • RCX C-Link • Convert between CameraLink and 50ns Duplex LC fiber up to 300m • Tested with ~70m fiber and ~110ºF

  8. Profile Monitor

  9. Snapshot: historical moment

  10. Drive Laser Image Acquisition • PULNiX TM-6710CL camera • CCD: 1/2” • Shutter: Full Frame • UV option: Yes • Resolution: 648x484 • Progressive: Yes • External Trigger: Yes • Full scan: 120Hz • Analog Output: Yes • Cameralink: Yes • Genlock: Yes • EDT PMC DV C-Link • Cameralink compatible • 32bit/66MHz PCI • External trigger input

  11. Drive Laser Camera Crate

  12. LCLS Drive Laser

  13. Integrated Plug-and-Plug System should be very welcome

  14. Test Stand

  15. Test Stand

  16. Picture

  17. Air Force Reticle

  18. Snapshot: history buffer

  19. Dark/White Image Structure Spectrum

  20. CCD test (Data analyzed by Henrik Loos) White image noise histogram • Dark image noise histogram

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