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Meeting Minutes



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titleLaser Safety Meeting 16 November 7 December 2023

Meeting Minutes: 

    • Alex presented a summary of bibliography. Presentation can be found in the shared folder here:Image RemovedPoF_Shared_Folder

    • Sander presented about laser safety. Presentation in shared folder

    • Laser safety takes approx. 4 months. We need to start asap

    • The cryo measurement has been done by DUNE, what is our target? 
    • DUNE group at FNAL has favored connection with Broadcom, for customized products for cryo.
    • MSU and CU reached out to James about the status of the project.
    • We can lend setups to partners. One Broadcom setup is around 2k

Next Steps: 

 We had our first laser safety meeting with Mike Woods and these slides were presented: 231130 first laser safety meeting.pptx

    • We should look at commercial products to see how they are doing interlocks
    • Important things that our system should have:
      • Key
      • Emission Indicator (red/green)
      • interlocking
      • (optional) Emergency OFF button
    • The box should have 2 redundant interlocks in series
    • If the box is made up to specs we will not need a separate laser area and will not need eye protection to operate
    • Box material can be 80/20 Aluminum
    • For the feedthrough we should think of having an elbow to avoid direct line of sight
    • We have to take into account the fiber bend radius
    • SOP is not enough, we will need a separate approval to operate
    • People working on the assembly of this will need:
      • 253
      • 131
      • T53
    • People only operating will need only a simpler laser safety basic course
      • ???
    • Mike gave us permission to buy the laser

Next Steps: 

    • Mike Woods asked for a component list
    • Norman Picker asked us to start a Hazard list with Mitigation (All the risks will be Extremely low)
    • Sketch of lab space in 113 (James) 
    • Ask Ryan about Lab space in building 84 (Sander) 
    • Contact Mike Wooks for a meeting (Sander) 
    • Redefine Scientific goals (everybody) 
      • Verify if it can power 1 reticle (min) and 16 reticles (max) (Alex) 
    • Contact DUNE at FNAL (Sander) 
    • Can we/ Will we take a SULI Student? (Caterina) 
      • Draft of PCB board (Pietro) 
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titleMeeting 2 November 2023

Meeting Minutes: 

    • Marty talked to Michael Woods (Laser Safet Officer at SLAC), and he seems understanding of our need. General recommendations: laser always connected to a receiver, laser in a box,...?
    • Mengqing at Nikhef has a set of lasers. A possible collaborator.
    • Sander has been to the laser safety event at Stanford.
    • We need to think about the system level for safety, and for practical reasons (where to dissipate power in a power-pulsed system). We either have to control the laser, or tune it to deliver the 'average' power that is stored on a capacitor, and regulated with an LDO
    • We need to start with a generic system, with LDO, and a set of variable loads (resistors) with a way to monitor the ouput voltage and current, to characterize the system before connectiong it to any real load (ASICS, SiPM).

To Do list:

    • Start ES&H Process on laser safety (Sander)
    • Literature study on solutions/competitions (Alex)
    • create a list of possible laser and diode providers (Alex and James)
    • Concept design of PoF board (Pietro)
    • Start setting up a lab space (James)
    • Reach out to collaborators, with a potential meeting before winter break (Sander and James)
    • Keep an eye for relevant talks at CPAD and NSS (everybody)