Xe doping: Motivation and Plans M. Gold, U. New Mexico humanity - - PowerPoint PPT Presentation

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Xe doping: Motivation and Plans M. Gold, U. New Mexico humanity - - PowerPoint PPT Presentation

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Xe doping: Motivation and Plans M. Gold, U. New Mexico humanity light the life of man Photon Detector Workshop, CSU May 17-18 2016 M. Gold, UNM 1 Light low E resolution (10~20)% PID, fiducial BG rejection T 0 for

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Photon Detector Workshop, CSU May 17-18 2016

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  • M. Gold, UNM

Xe doping: Motivation and Plans

  • M. Gold, U. New Mexico

“light the life of man”

humanity

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  • M. Gold, UNM
  • low E resolution (10~20)%
  • PID, fiducial
  • BG rejection
  • T0 for non-beam
  • Shifting λ 128 →175 nm
  • NIR 1100-1600 nm

Light Xe doping

“Scintillation light is becoming the most rapidly developing feature of Liquid Argon Time Projection Chamber (LArTPC) neutrino detectors due to its capability to enhance and expand their physics reach traditionally based on charge readout. ”

Szelc, JINST 11, February 2016

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  • M. Gold, UNM

in~1cm3 cell

Wavelength shift: How much Xe do you need?

  • O. Cheshnovsky, B. Raz, J. Jortner,
  • J. Chem. Phys. 57 (1972) 4628.

α source

←λ

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  • M. Gold, UNM

in~1cm3 cell

10 ppm, Xe absorbs > 80% of the energy (nearly all slow triplet)

  • A. Neumeier, et al., Nucl. Instrum. Meth. A 800, 70-81 (2015)

e- beam

149 175

Wavelength shift: How much Xe do you need?

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  • M. Gold, UNM

Timing

Ar - singlet ~ 10 ns, triplet: ~ 1600 ns Xe - singlet ~ 7 ns, triplet: ~ 20 ns

Whittington, et al. arXiv:1511.06345v2

TALLBo TallBo

25% prompt

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  • M. Gold, UNM

Attenuation length

λ175 (3%Xe) 118-170 cm with difference is attributed to Xe clumping (irrelevant at small concentrations) (Ishida, ibid)

Older measurements for λ(128 nm) Ar ~ 66 cm.

More recent measurement made measured >110 cm. discrepancy attributed to trace Xe in older measurements.

e.g. N. Ishida, et al., Nucl. Instrum. Meth. A 384 380-386 (1997), Neumeier Eur. Phys. J. C (2012) 72:2190 Neumeier, et al., Europhys. Lett. 111 12001 (2015)

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  • M. Gold, UNM

Xenon can act as a critical impurity in pure liquid argon scintillation detectors. For a concentration above 0.1 ppm xenon in liquid argon, the mixture is opaque for the scintillation light of pure liquid argon below ∼ 130 nm

Neumeier et al. arXiv1511.07725v1 (EPL,2015)

Electron beam induced emission, T. Heindl et al.,

  • Europhys. Lett. 91, 62002 (2010)

Trace Xe, very bad

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  • M. Gold, UNM

~ 25% increase in light.

  • M. Suzuki, et al., Nucl. Instrum. Meth. A 327 67-70 (1993)

Wavelength shift

simplified process:

still get Q

Neumeier,EPL,106(2014) 32001 as explained by Alex

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  • M. Gold, UNM

Xe doping can be significant within DUNE proposed light schemes:

Possibilities for direct and indirect 175 nm detection

JINST 8, C12003 (2013). arXiv:0910.1056

Reflected light scheme: polished PTFE (teflon) has a reflectivity @175 nm >74%. TPB and bis-MSB coated waveguides: evidence that shifting the light to 175 nm gives ~2.5 more light collected by

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  • M. Gold, UNM

Neumeier arXiv:1511.07723

pure LAr

10 ppm xenon

Electron-beam induced VUV and IR emission spectra in LAr Intense Vacuum-Ultraviolet and Infrared Scintillation of Liquid Ar-Xe Mixtures

Near Infrared

Hamamatsu NIR-PMT Module H10330B-45 SEL

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  • M. Gold, UNM

Escobar, et al. arXiv:1603.02290

Metal-Resistor-Semiconductor Geiger gain Avalanche Photo Diode (MRS GAPD) sensitivity peak 600 nm, extending to 1000 nm.

Teledyne Judson InAs Diode

Neumeier 1511.07722v1

Near Infrared

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  • M. Gold, UNM

Generation 3? Dark Matter

single phase LAr : DEAP, MiniCLEAN

CERN Yellow Report CERN-2014, arXiv:1504.07050

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  • M. Gold, UNM

pure Ar

1093 ppm Xe

McKinsey JINST 9 (2014) P06013

PSD (timing)

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  • M. Gold, UNM

radon alpha and 228Th gamma events in Ar/Xe 300ppm

D=fast(<40 ns)/total

? inhomogeneity in 40 cm deep Ar

Schönert, JINST 8 (2008) P08007

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  • M. Gold, UNM

Neumeier arXv:1511.07723

Possibly improved PSD for dark matter, combining VUV,NIR

expect more NIR for denser ionization tracks

86%

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  • M. Gold, UNM

BACoN♮ 120L, thanks to Keith Rielage (LANL)

Alex Mills UNM student Keith Rielage

♮tortured acronym

Ongoing R&D at UNM

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  • M. Gold, UNM
  • 1. Bacon 100 liter chamber — two chambers with lids,

inside the inner can lined with TPB coated teflon sheets

  • 2. Cryomech AL60 refrigerator— compressor, cold

head

  • 3. SAES getter
  • 4. 2 R11065 PMTs
  • 5. Lakeshore temperature monitor
  • 6. AMI level sensor
  • 7. Pfeiffer Prisma Plus RGA

On loan to UNM from LANL

UNM scrounged vacuum pumps

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  • M. Gold, UNM

Ar condenser designed by undergrad A. Mills (now UNM grad)

MDC vacuum, expect delivery now!

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  • M. Gold, UNM

sampling senior lab vacuum chamber preparing to cool with LN We got cheap RGA! grease

ICARUS Collaboration, “Design, construction and tests of the ICARUS T600 detector”,

  • Nucl. Instrum. Meth. A527 329–410 (2004)
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controlled doping procedure in range 1~10 PPM (precision manometer) measure depth uniformity (RGA) reproduce previous Ar→Xe in large Vol.,1 glass PMT+TPB coated acrylic disk + VUV sensor (e.g. R11410 arXiv:1202.2628, siPM nEXO in arXiv:1502.07837) efficiency of polished PTFE reflector study NIR emission (sensor, siPM Advatech ) scale up to CAPTAIN

Some R&D goals:

Possible Collaborators: R. Cooper, NMSU?,xxx?

well for source

put all the pieces together and see light!

TPB coated liner

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  • M. Gold, UNM