TPC%20laser%20system%20controls

1
TPC laser system controls
Laser hut
adjustable mirrors
Laser
Controls, Power, Cooling
DCS 1/ Laser 2/ Mirror adjustments
3/ Beam monitoring cameras 4/
Interlocks
2
Spectron UV laser
2 UV Lasers supplied by Spectron Lasers (UK)
Rack with power supply and water
cooling. Controlled and monitored by RS232 to 2
DOS programs.
3
Spectron UV laser

• In ALICE
• Lasers placed in pit in enclosed hut outside
  shaft side
• magnet door
• Full control of laser operation must be
  possible remotely
• Full monitoring of laser state must be possible
  remotely

• Existing Spectron software is not suitable.

Last meeting develop with PVSII directly,
based on existing GSI software Note this
laser needs 2 independent controls laser setup
control
stability
tracking
4
Mirror adjusters
Based on commercial solution
? 3 fully adjustable mirrors per half-TPC
RS 232 or RS 485 interface
5
Mirror adjusters

• In ALICE
• Mirror holders placed in laser hut and on TPC
  end-plates
• Full control must be possible remotely
• Automatic adjustments with feed-back from
• online beam monitoring

New Focus provides Windows program for RS 232 or
RS 485 connection, but only useful for manual
adjustments.
Develop our own software for automatic
adjustments. LabVIEW drivers exist.
Last meeting develop with PVSII directly
6
Beam monitoring
Beam quality and position monitoring online by
video cameras (several frames per second)
? 5 video cameras per half TPC
Last meeting need to select camera and test
magnetic field radiation
7
Beam monitoring

• In ALICE
• Full control must be possible remotely
• To be used for automatic beam controls through
• Cameras placed in laser hut and on TPC
  end-plates
• mirror adjustments

Camera type to be chosen, but Web cameras with
USB interface seem able to do the job. Display
programs probably only useful for manual
operations.
Develop our software for automatic adjustments
LabVIEW ?
Last meeting acquire images into LabVIEW,
interface to PVSII (DIM) Does this allow for
camera controls?
8
Intelligent beam steering

• Cameras and mirror adjusters must be tied
  logically together
• Acquire a camera frame
• Analyse for position information
• Calculate mirror adjustment
• Execute mirror adjustment
• Loop

Would be nice to use fancy image analysis tools
(e.g. LabVIEW)
Screen graphics important, to manipulate by hand,
or follow the automated procedures
How does this fit into PVSII ?