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The ECAL Monitoring System

Current design of the laser triggers and the communications between the XDAQ laser supervisor and the laser DAQ at H4. The ECAL Monitoring System. Mission during March Commission.

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The ECAL Monitoring System

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  1. Current design of the laser triggers and the communications between the XDAQ laser supervisor and the laser DAQ at H4

  2. The ECAL Monitoring System Kejun Zhu, Caltech

  3. Mission during March Commission • Add an adjustable delay in the laser trigger chain. All laser pulses from three lasers will arrive at the same time with a 2 ns jitter relative to the triggers from the EMTC card. • A new Acqiris AP240-SSR (2 GS/sec) card with dual bank memory and automatic switching allowing digitization of the waveform when PC is retrieving the data. Kejun Zhu, Caltech

  4. CMS IN 2003/045 Kejun Zhu, Caltech

  5. Communication Protocol • Command received from the H4 DAQ • set laser parameters • get laser parameters • get laser parameters and pulse information • Acknowledge sent to the H4 DAQ • laser parameters • laser parameters and pulse information Kejun Zhu, Caltech

  6. Summary of the Laser Trigger • Laser system is controlled by a PC, works in a handshake mode with the H4 DAQ. • It receives a NIM trigger signal from, and sends a NIM timing signal to, the H4 DAQ. • The communication layer is TCP/IP. • H4 DAQ must check the laser status before sending out the trigger signal. Kejun Zhu, Caltech

  7. Asynchronized Communication • Communication delay via Ethernet can’t be determined. It has a long tail. • Linux is not a real time OS, so the time to execute the command can’t be determined. • Laser control PC runs several tasks, such as acquire and analyze the digitized pulse data. • Time needed to change the attenuators and wavelengths are device dependent for different lasers. • Without the handshake the laser system will not work, and may be damaged. Kejun Zhu, Caltech

  8. Summary • The laser supervisor must check laser status before sending the laser trigger, which can be implemented through the handshake via the Ethernet. • A faster monitoring can be achieved by inserting the EMTC card directly in the PCI bus of the laser PC to avoid the overhead caused by handshake via the Ethernet. Kejun Zhu, Caltech

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