UK Photodetector Laboratory

Objective: set up a UK photo-detector test facility, open to all universities/collaborators. The facility to house equipment not easily found in universities based on a tunable high field magnet with associated photo-detector test equipment, accessible DAQ, and a modern laboratory work/study area.

The twiki starts with details concerning high field magnets, and at the bottom has an evolving wish list of items to provide a well found photo-detector laboratory.


24 Feb 2015, Meeting to discuss next steps for the 5 T facility, decisions
* Tim Durkin's Magnet_Report_-_3.docx
3D printing scale model of the future Lab 7:
* IMG_20150213_135927_443-lab7.jpg, and IMG_20150213_135934_167-lab7.jpg:
IMG_20150213_135927_443-lab7.jpg IMG_20150213_135934_167-lab7.jpg

22 Oct 2014, Discussion on possible high field magnets, Tim's slides, minutes
Main conclusion - agree on a cryogen-free superconducting magnet, to 5T or more, bore size ~300 mm, length ~55 cm as the baseline for the facility.

Magnet definitions/comments

  • Cryogen-free superconducting magnets or "dry magnets" - these are the ones of interest to us, the liquid helium is only used as the working fluid in a sealed refrigerator and does not cool the magnet directly.
  • "Wet" superconducting magnets are conventional magnets cooled by liquid helium. Although there is a cost associated with using liquid helium, these magnets are cheaper to buy than cryogen-free magnets and can provide more stringent magnet design.
  • Closed cryogenic loop magnet system, like the one for MICE, (which Dave Tim and I saw last week (24Oct 2014), is not the same animal as a cryogen-free magnet system.
  • Closed cryogenic loop magnet systems do not require regular deliveries of liquid helium like an open-dewar system (Brunel/UVA), but you can still lose helium in a quench, unless you have a gas storage system with the appropriate capacity.

Magnet Specification

The cost of the system is likely to result in a bid submission to OJEC (Official Journal of the European Communities).
Listed here are preliminary mandatory specifications for the magnet. Please add/edit.
  • A cryogen-free superconducting system (sometimes referred to as a dry system, with the liquid helium as the working fluid in a sealed refrigerator, not cooling the magnet directly).
  • Field strength at least to 5 T
  • Field to be adjustable, at will, from 0 T to 5 T
  • Remnant field at 0 T (zero current) less than MMM G
  • Bore - horizontal, with free access at each end
  • Bore 300 mm diameter
  • Bore length 55 cm
  • Bore temperature - room temperature
  • Height of bore axis above floor, 70 cm +- 10 cm ???
  • Bore to be vibration free
  • Fringe field, less than XXX G at YYY m
  • ???

Magnet suppliers


Well found lab

Photo-detector test equipment wish list:

  • The SLM-828-laser.jpg and the SLM-828-oscillator.jpg:
    SLM-828-laser.jpg SLM-828-oscillator.jpg

  • Crate for the lasers and oscillator, pdl_828_large-crate.jpg:

-- DavidCockerill - 2014-10-29

  • pdl_828_large-crate.jpg:

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Cryogen-free-magnets.pdf r1 manage 170.8 K 2014-10-29 - 11:43 DavidCockerill  
JPEGjpg IMG_20150213_135927_443-lab7.jpg r1 manage 1821.8 K 2015-02-24 - 14:41 DavidCockerill  
JPEGjpg IMG_20150213_135934_167-lab7.jpg r1 manage 2109.7 K 2015-02-24 - 14:41 DavidCockerill  
Unknown file formatdocx Magnet_Report_-_3.docx r1 manage 1672.5 K 2015-02-24 - 14:41 DavidCockerill  
PDFpdf PPD_5_T_Magnet_facility_-_mtg_on_Tue_24_Feb_-_top_level_decisions.pdf r1 manage 73.0 K 2015-02-25 - 10:29 DavidCockerill  
PDFpdf PPD_Photo_Detector_Facility.pdf r1 manage 1190.3 K 2014-10-29 - 11:46 DavidCockerill  
JPEGjpg SLM-828-laser.jpg r1 manage 16.8 K 2014-10-29 - 14:14 DavidCockerill  
JPEGjpg SLM-828-oscillator.jpg r1 manage 18.8 K 2014-10-29 - 14:14 DavidCockerill  
Texttxt minutes-22Oct2014.txt r1 manage 1.6 K 2014-10-31 - 09:43 DavidCockerill  
JPEGjpg pdl_828_large-crate.jpg r1 manage 146.3 K 2014-10-29 - 14:42 DavidCockerill  
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Topic revision: r5 - 2015-02-25 - DavidCockerill
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