Title: ELI: Electronic Timing System (ETS) at Facility Level
1ELI Electronic Timing System (ETS) at Facility
Level
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2ELI 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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3ELI 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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4ELI 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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5ELI 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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6ELI 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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7ELI Facility Timing System
ELI Beamlines Beam Distribution
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8ELI Facility Timing System
Facility level timing system architecture
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9ELI 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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10ELI Facility Timing System
Integration to Facility Level Control System
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11ELI 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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