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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 d ye lasers.

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initial safety discussion cris at isolde

Initial Safety discussion: "CRIS" at ISOLDE

Kieran Flanagan on behalf of the CRIS collaboration

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

Breakdown of line

Brewster window

Interaction region

Beam diagnostics

Detection setup





Charge exchange

cell and HV cage

beam line1
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,

Faraday cage

pulsed lasers
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 lasers1
Pulsed Lasers

Pulsed Laser Hut

Optical Table


Fibre coupler

Remote Monitor

Equipment Storage

Doubler Unit



Launch Optics in front of beam line

50Hz SpectronNd:YAG

Pulsed Dye laser

pulsed laser location
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 toreducing 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
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
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
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.
neutralization cell and alkali chemical procedures1
Neutralizationcell 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
Continuous Wave Laser Laboratory
  • Located in building 507and 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.
  • Lasercurtains 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 System

380 Dye laser

Fibre coupler

Pump Laser

Data Acquisition

CW laser lab and

counting house

System Monitoring

Remote control

Temperature 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 room