ATF Laserwire data acquisition system

1
ATF Laserwire data acquisition system

• Laserwire phone meeting Friday 22nd July
• Gary Boorman and Stewart Boogert
• Outline requirements for ATF Laserwire system
• DAQ to be installed at ATF in September
• Overview of software
• Computer and computing environment required
• Physical environment (rack space etc)
• Shopping/fabrication list
• Conclusions and summary

2
ATF accelerator
ATF extraction line

• Environment much better than at PETRA
• Experience from PETRA invaluable
• Cable lengths, integrated readout and control
• Pros/cons
• Much higher power laser
• Require shutter and optics protection (passive or
  active?)
• Better access
• Lower synchrotron radiation, less damage to CCDs
  (also optics)

3
Data acquisition system requirements

• Main detector components are
• Compton detector
• Air cherenkov detector with PMT
• Laser diagnostics
• Power (photodiodes)
• Position (CCDs or PSDs)
• Optics control
• Mirror movement
• Picomotors
• Main scanner control
• HV driver and DAC
• Laser trigger and control
• Already done for existing Compton detector
• Electron beam diagnostics
• Beam position monitors
• Wire scanners (use existing system)

• Read out requency range
• ATF system less taxing than PETRA
• Frequency
• Legacy software (Visual basic)

4
DAQ installation plan
PETRA Tunnel rack
PETRA Tunnel rack

• Laserwire components
• September
• Compton signal
• Mirror control
• CCD alignment of laser beam
• Laser shutter and alignment lasers
• Possible to observe collisions between beams in
  December
• Test beam size
• December/March
• Strip line readout
• Beam size and scanning diagnostics
• Calibrated (laser position and size) beam size
  measurement

ATF cable feed hole
5
PETRA and ATF acquisition electronics

• Off the shelf components
• National Instruments ADC/DIO cards
• Basler firewire CMOS cameras
• GPIB/Network scopes (e.g Beam position monitors)
• Custom (generic function) cards
• Laser control card
• Trigger fan out and delay
• Charge integration
• Calorimeter PMT pulse
• Peak detection
• Photodiodes
• Power meter
• Labview development
• Small other executable codes controlled from
  labview

Scope trace of charge integrator operation (green
integrate, yellow signal)
6
PETRA and ATF acquisition software

• Main control performed in Labview
• Separate software for
• CCD
• ATF accelerator information
• Whole system connected with TCP/IP messaging
  system
• Control arming of system
• Return data to main control software
• Fine for low frequency systems lt50Hz
• Problematic at higher laser frequencies
• Software exists for PETRA and will be modified
  for ATF during visit in September
• Should be in useable and stable state from end
  September
• Currently implenting features useful for the ATF,
  for example scan history plots etc. for 4-D
  overlap searching

Main labview DAQ program
7
Computer and computing environment

• Computer
• Intel based computer
• Specs
• Dual processor
• Large RAM gt1 Gbyte
• Large number of PCI slots for maximum DAQ
  flexibility
• Separate backplane and Single board computer
• More expensive
• More flexible
• Network connection with KEK
• Fixed IP address on ATF network
• Configure KEK VPN client for collaborators to
  have secure connection to DAQ machine
• Location
• Laser hut with existing computers
• Main DAQ and laser diagnostics DAQ

• Operating system
• Windows difficult to access over network and from
  ATF linux based machines.
• Try to migrate to LINUX
• Easer for code development (everyone has or can
  get gcc)
• Remote access
• Export X-windows to ATF control room
• Labview available for LINUX
• Useful development between WindowsLabview and
  VME LINUX system
• Might be a problem for divers for NI-DAQ cards
• So
• Plan A try LINUX
• Plan B revert to Windows XP with Cygwin for
  unix access if LINUX fails

8
DAQ physical environment

• Laser hut
• Conditioning power supply
• BPM readout
• DAQ computer
• Tunnel/Laser hut connection
• Cables
• 10m run using existing hole
• 6m with new hole
• Signal/control cables
• Single ended (can always upgrade system with
  differential transceiver system later)
• Intercom
• Secure commutation between optics table and laser
  production
• Network, might need to control active optical
  elements from laptop in tunnel

• Extraction line
• Rack similar to PETRA tunnel rack
• lt700 mm high to fit under optical table
• Scope for checking signals in tunnel
• Any other requirements?
• To resolve before September
• Number/type of cables?
• Length (do we get a new hole?)
• Computer Specifications (next week)
• NI-DAQ cards (already decided, Gary to order)
• Powermeter / (fast)photodiodes

9
Shopping/fabrication list

• To be researched and sources
• Computer
• Dual processor
• Large number of PCI slots for flexibility
• NI-DAQ cards
• More modern versions of cards deployed at PETRA
• Electronics rack for tunnel
• lt700mm high
• 6U sub rack for optics control and power supplies
• Photodiodes, power meter (some existing
  components available)
• CCD cameras
• One at RHUL now for testing
• 2 more required for alignment
• Shutter and control

• To be built
• NI-DAQ breakout box
• Can purchase from NI
• Charge integrator/peak detector card
• Essential for signal measurement
• Also useful for power meters and fast photodiodes
• Optics control
• Picomotor controller
• Scanner HV driver
• ATF stipline RF processing electronics
• FONT3 system will be redesigned for 150ns bunches
• Copy FONT4 system

10
September task list

• Suggested goals for September
• Pull cables through from ATF to laser hut
• Do we get a new hole drilled?
• Time all cables accurately
• Install test and network DAQ computer
• Rewrite sections of Labview for new cards and ATF
  environment
• Install and test
• signal integration
• Install rack in Tunnel and connect to relevant
  optics and laser diagnostics
• Communication with ATF TCP control
• Corrector control
• ATF strip line readout and torroid measurement
• Quad control?
• Waist knobs?

• Other tasks
• Understand existing laser triggering system
• Possibility of replacing whole laser trigger
  system
• flexible and more reliable single card solution
  based around FPGA or PLD with programmable delay
  lines
• Existing solution complicated and not
  maintainable by UK collaborators
• Laser power control essential for good reliable
  operation Laserwire operation

11
Conclusions and summary

• Need to order components soon
• Propose by 1st August, gives 1 month delivery
• Computer 2 weeks installation and carry with us
  in September
• Rack Order and ship directly to KEK
• Components can be taken with us, 3U drivers for
  example
• Gary can these be produced in time?
• Software well under control
• GB constantly improving PETRA system
• ND/SB have experience with the ATF accelerator
  data via TCP/IP
• Should be able to take data in December, slow
  (picomotor) or fast (piezo-stack) scanning
• Can include driver for pizeo in December (one
  spare already at RHUL)
• BPMs still a problem
• Using existing electronics we can use fast scope
  with network connection/GPIB
• Move to VME system
• UCL took delivery of 2 SIS 8 channel 125 MHz 14
  bit ADC VME cards
• Will test at RHUL and decide(GB/SB) if new
  system should be based on these (also require
  DIO/DAC cards)