ELI: Electronic Timing System (ETS) at Facility Level

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ELI Electronic Timing System (ETS) at Facility
Level
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ELI Facility Timing System
ELI Beamlines Facility Structure

• Physical structure of ELI Facility
• 4 lasers
• 5 experiments
• Server room
• Main control room
• Technology Subsystems of ELI Facility
• High power lasers and diagnostic lasers
• Beam distribution
• Beam alignment
• Beam diagnostics
• Experiments

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ELI Facility Timing System
Main Roles and Tasks of Electronic Timing System
(ETS)

• The facility level timing system is part of
  facility level control system
• All lasers are complex subsystems from the point
  of view of facility level control and timing
  systems
• The facility level timing system must provide
  required functionality to all facility
  subsystems
• Synchronization of all subsystems during
  operation
• Trigger signals for all devices during operation
• Tasks provided by facility level depends on
• Facility structure (beam distribution)
• Functionality provided by each subsystem

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ELI Facility Timing System
Main Roles and Tasks of Electronic Timing System
(ETS)

• Laser subsystem
• Each laser is driven by its local timing system.
  Local timing systems are not based on the same
  technology
• L1 in house developed (MRF based ETS)
• L2 will be delivered later (Unknown)
• L3 contracted to LLNL (Greenfield based ETS)
• L4 will be delivered later (Unknown)
• Therefore each laser subsystem must provide basic
  interfaces for proper operation in complex
  technology
• Access for laser subsystem settings and driving
• Input for central clock signal for
  synchronization
• Input for laser triggering

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ELI Facility Timing System
Main Roles and Tasks of Electronic Timing System
(ETS)

• Alignment, Diagnostics and Experiment subsystems
• Requirements depends on type of devices which
  would be triggered
• High speed devices (Streak cameras, Alignment
  lasers, high speed digitizers and other high
  speed detectors)
• Low speed devices (CCD/CMOS cameras, lower speed
  ADC and other detectors)
• Therefore two types of delay generators are
  required
• High precision delay generators
• Low precision delay generators

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ELI Facility Timing System
Timing System Levels

• There are three different levels when looking at
  the expected timing accuracy
• Femtosecond level that is required whenever two
  or more femtosecond beams are overlapping at the
  focal spot. Typical requirement would be a timing
  overlap better than half the pulse duration (ie.
  10fs range).
• Picosecond level that is commonly accessible with
  electronic devices. Most sophisticated timing
  triggering can reach 10ps jitter. This is the
  best available accuracy for typical laser
  experiments when driving streak cameras (best
  resolution is 20ps).
• Low level that is not requiring any precise
  timing when pulse duration and pulse rise time
  are greater than 100ps (typically CCD cameras,
  Osciloscopes etc.).
• Levels 2 and 3 are to be discussed, these levels
  may be realized using Electronic Timing System
  (ETS)

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ELI Facility Timing System
ELI Beamlines Beam Distribution
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ELI Facility Timing System
Facility level timing system architecture
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ELI Facility Timing System
Integration to Facility Level Control System

• Facility level control system is based on these
  technologies
• Optical network
• Linux OS
• TANGO control system (provides support for
  Matlab/Simulink, Labview, Python etc.)
• Facility level Control computer and DAQ system
• High level control and DAQ systems are based on
  rack mounted servers with PCIe interface
• Local machines may be based on other bus
  technologies (cPCI(e), PXI(e) or others), these
  may be used in experimental rooms
• Synchronization of real time values of control
  computers and DAQ system
• NTP/PTP support
• Support for White rabbit open timing system

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ELI Facility Timing System
Integration to Facility Level Control System

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ELI Facility Timing System
Functional Requirements

• Signal of timing system must be able to be
  distributed up to 500m
• The master must be able to drive up to 200 delay
  generators.
• Expandable up to 2000 adjustable and independent
  trigger channels
• The timing system must provide sequences single
  shot, repetitive shots, single burst, repetitive
  bursts etc.
• Output adjustable with repetitive frequencies for
  users 1Hz, 10Hz, 100Hz, 1kHz, 2kHz, 100kHz
• The communication channel must provide users
  messages
• The information in the users messages must be
  able to identify all triggers at the facility
  level
• The user must be able to read and write user
  messages
• The timing system must provide PCI express based
  card which provides read/write access to users
  messages
• The timing system must be able to provide delay
  generator cards based on PCIe, cPCI, cPCIe, PXI
  and PXIe (future) buses for future users requests
• Delay generator cards must be able to read/write
  user data for local time stamping

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