Installation of IS471 experimental equipment in building 170 - Cern by hcj


									Initial Safety discussion: "CRIS" at
   Kieran Flanagan on behalf of the CRIS
                 IPN Orsay
•   Overview of the beam line
•   Pulsed laser location and considerations
•   CW lasers and laboratory
•   Neutralization Cell and alkali metal handling
•   Solvents for dye lasers
Beam Line
                       Breakdown of line
Brewster window        Interaction region                  Beam diagnostics

     Detection setup                              Light
                                                         Charge exchange
                                                         cell and HV cage
                   Beam Line
• Total enclosure of pulsed laser beams into
  vacuum system with interlocks (effective class 1
• UHV Section
  – Shielded from contact due to bake-out temperature
• High voltage section.
  – Up to 20 kV (Maximum rating of the HV supply)
  – Purpose built Faraday cage with interlocks to power
  – Insulation for 60kV
                 Breakdown of line
                  Interaction region

UHV section which will be baked out at between
                                                 Up to 20 kV section,
                                                 Faraday cage
              Pulsed lasers
• 10Watt, 50 Hz Nd:YAG laser, 1064, 532, 355nm
• Pulsed Dye amplifier 570-1100nm wavelength
• Solvents present cabin (Methanol, DMSO...)
• CW laser launched into laser room with 550-
• Production of pulsed UV beams (200-400nm)
                       Pulsed Lasers

 Pulsed Laser Hut                   Optical Table

                           Fibre                    Remote           Bend
Equipment                 coupler                   Monitor
 Storage                                        Doubler Unit

                           PDA                      WEX        Launch Optics in
50Hz Spectron Nd:YAG                                            front of beam

                             Pulsed Dye
             Pulsed laser location
• Limited access requirements during on-line runs, interlocked
  Nd:YAG laser with either cabin door or enclosing box.
• Nd:YAG can be operated remotely with video monitoring to
  reducing interventions to the area
• Enclosed beam transport on laser tables and from them to
  the beam line.
• Low power mode on Pulsed laser for alignment tasks.
• Only fully trained personnel will have access to the room
  (door/enclosures remains locked at all times)
• Dual hazard warning lights on cabin to show users when
  beams are on and when they are being aligned.
Construction of cabin or enclosed area
• Two options: Non-flammable metallic
  construction, or curtains
• If curtained then laser tables and beams
  would be enclosed.
• Interlock either on door to cabin or enclosures
  containing the lasers.
• Favour curtain option as offers greater access
  and ease of escape in case of emergency
      Construction of Beam line
• Mounting system has been constructed and fully
  tested for stability and loading in Manchester.
• Rail system allows individual heavy components
  to be moved without risking injury to personnel.
• Mounting rail system will be installed by two
  professional technicians from Manchester with
  assistance from a postdoctoral fellow and PhD
• Installation of frame week starting 24th November
 Neutralization cell and alkali chemical
• The beam-line has an alkali neutralization cell (similar to the
  COLLAPS line) which will be loaded with Na, K, or Cs alkali
  metals (for most experiments this will be Na).
• The cell will be heated to a maximum of 200-220⁰C (for Na).
• A hot oil circulator (Jubalo ME4) will located next to the beam
  line to cool the ends of the neutralizer to 100⁰C with an
  interlock to the power supply for the hot cell.
• System is being tested in Manchester before being sent to
Charge Exchange Cell
 Neutralization cell and alkali chemical
• The temperature on the cell is monitored via a thermocouple
• Line is vented with either dry nitrogen or noble gas (Ar) only
  once temperature has reached room temperature.
• Unit can be completely removed and taken to chemical
  laboratory to be cleaned and reloaded.
• In the event of a chemical fire during the extraction procedure
  the vacuum chamber is reloaded and filled pumped down via
  the rough backing pump (See COLLAPS)
• Alkali metals will be stored in the Chemical store of the
  ISOLDE corridor.
Continuous Wave Laser Laboratory
• Located in building 507 and comprises of a CW pump laser (532nm
  18W) and a CW dye laser and TiSa laser (Spectra Physics 380).
• Accessible wavelength range 570-1100nm with up to 1W of CW
  laser radiation.
• Dye circulators will typically use Ethylene-Glycol as main fluid with
  mixes of Benzyl alcohol or methanol.
• Laser table will have walls fitted contain stray laser light.
  Interlocking this laser is not possible due to stability requirements
  and access to relock laser during operation.
• Laser curtains will be places around laser table to provide further
  protection to personnel. Additional web camera monitoring will
  reduce need for intervention by operators.
• Window in cabin will have a blind suitable for class IV lasers
Optical Table

                        380 Dye              Fibre
 Pump Laser              laser              coupler

                       CW laser lab and
   Data                counting house

 System             Remote        Temperature
Monitoring          control       stabalization
• For both pulsed and CW lasers solvents such
  as methanol and DMSO will be used.
• After an experiment has finished these will be
  drained from the device and disposed of.
• Preparation of the dyes for the laser will be
  done in the chemical laboratory on the ISOLDE
  corridor within a fume cupboard.
• No solvents will be stored in the hall or laser

To top