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

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									Initial Safety discussion: "CRIS" at
               ISOLDE
   Kieran Flanagan on behalf of the CRIS
               collaboration
                 IPN Orsay
                    Summary
•   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
                                   Differential
                                                  collection
                                   Pumping
                                                         Charge exchange
                                                         cell and HV cage
                   Beam Line
• Total enclosure of pulsed laser beams into
  vacuum system with interlocks (effective class 1
  laser)
• UHV Section
  – Shielded from contact due to bake-out temperature
    250⁰C
• High voltage section.
  – Up to 20 kV (Maximum rating of the HV supply)
  – Purpose built Faraday cage with interlocks to power
    supply
  – Insulation for 60kV
                 Breakdown of line
                  Interaction region




UHV section which will be baked out at between
                                                 Up to 20 kV section,
150-250⁰C.
                                                 Faraday cage
ISOLDE Hall
              Pulsed lasers
• 10Watt, 50 Hz Nd:YAG laser, 1064, 532, 355nm
• Pulsed Dye amplifier 570-1100nm wavelength
  range.
• Solvents present cabin (Methanol, DMSO...)
• CW laser launched into laser room with 550-
  1000nm
• 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
                                                                     line

                             Pulsed Dye
                                laser
             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
  student.
• Installation of frame week starting 24th November
 Neutralization cell and alkali chemical
              procedures
• 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
  CERN.
Charge Exchange Cell
 Neutralization cell and alkali chemical
              procedures
• 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
                                  Locking
                Wavemeter
                                  System

                        380 Dye              Fibre
 Pump Laser              laser              coupler



                       CW laser lab and
   Data                counting house
Acquisition


 System             Remote        Temperature
Monitoring          control       stabalization
                  Solvents
• 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
  room

								
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