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The Neutral Particle Spectrometer

Latest news

• NPS meeting 10 December at 9:00 AM (EST) Link to Meeting Agenda and Summaries

• NPS crystal testing facilities: CUA/CU (US), IPN-Orsay/Giessen (EU)

• Two presentations related to NPS at the DNP2015 (ERK in PH0006, TH in NH0004)

• NPS is mentioned in the DOE NSAC 2015 Long Range Plan - Reaching for the Horizon (p.16 (24))

• 30 PbWO4 crystals from SICCAS arrived - testing to start soon

• CUA and IPN-Orsay receive award from EIC detector R&D for crystal procurement and crystal quality tests

• Congratulations to the NPS collaboration! We were awarded with the NSF MRI (PHY-1530874), so now we can start building the Neutral Particle Spectrometer!

• Received 4+4 BTCP crystals and 1 CRYTUR crystal for testing

Components characterization and detector construction

Detector Construction	⇒	x150px Pictures	Detector design		Reference Material
PWO crystals characterization	⇒	Light transmittance	Radiation hardness	x150px Light yield
Other components	⇒	x150px Photomultipliers and photodiodes	x150px Temperature stabilizer frame	x150px Digitizing electronics
Simulations	⇒	x150px Detector resolution

NPS Crystal Test Planning

Summary from 10/27/2015 meeting

Participants: MAPC, SA, TH, MB, ILP

Measurement of Transmittance using Spectrometer Lambda 750

Transverse Transmittance (stepper motor)

• Testing Subset of Crystals
• Micro-switch to be bypassed for operation with opened door?
  • Can anything be damaged if someone opens the machine while operating it?
  • Would any accidental light leak be detrimental to the experiment?

    • See Perkin-Elmer L750 manual
    • Contact company to find out more info (MAPC, Marek)

• Conceptual Test for the stepper motor inside the spectrometer
  • Next week: (11/2 – 11/6) - Test with a black cloth.

Longitudinal Transmittance

• Testing Subset of Crystals
• What is the purpose of the windows? Should we remove them?

X-ray Irradiation

• Check with CUA radiation safety before testing machine. (TH, Miguel P., ILP)
• Can we move instrument downstairs?
• Clean room in which instrument is located
• Consult CP160 manual (Miguel P., NP group)
• Check radiation requirements
• Think about measurement of accumulated dose. Is there something in the instrument?
  • Search for options of dosimeters (CUA/JLab/internet).
  • Check out instrument
  • Calibration scheduling (TH, ILP, Miguel P.).

Additional Points

• Talk with Miguel to inform him of everyone that is working with the spectrometer.
• Build a dark box as a more permanent solution for crystal measurements. (2016, when we have more crystals, NPS group)

To Be Discussed

• NPS frame construction startup (once design drawings ready, est. early 2016)
• NPS magnet construction startup (once design drawings ready, est. early 2016)

The NPS Collaboration at Jefferson Laboratory

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