Ryan Wasserman Norm Buchanan · Tom Cummings Ryan Held 2 Wave Length Shifting-Fiber Prototypes ......
Transcript of Ryan Wasserman Norm Buchanan · Tom Cummings Ryan Held 2 Wave Length Shifting-Fiber Prototypes ......
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Ryan Wasserman
Norm BuchananColorado State University
LIDINE 2013
Fermilab - Batavia,Il
May 30, 2013
LBNE
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Dave Warner
Andrea Shacklock
Forrest Craft
Tom Cummings
Ryan Held2
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Wave Length Shifting-Fiber Prototypes
SiPM Measurements
Facilities Developments
Simulation Effort
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Proposed Long
Baseline Neutrino
Experiment
Neutrino beam from
Fermilab to
Homestake Mine
10 k-ton LAr-TPC
detector on surface
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Detection of prompt light gives initial
time for neutrino event
Doped WLS-Fibers are an effective
option for converting and guiding LAr
scintillation to SiPM• Possibly guide multiple fibers to one SiPM
Flexibility of fibers makes them easier to
work with
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Designing Fiber/Bar mounting frame for
all LBNE PD testing to fit into
Single PD mount Design frame for LBNE
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Mounting stand for CSU
dewars being
developed
Plan to use fiber only or
hybrid design to test by
fall
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Current test stand can
support fibers or bars
that go to SiPM
readout
Designed to be
similar to 35 ton
test specifications
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Currently using Hamamatsu SiPMs designed for T2K experiment
1.3 mm2 active area with 667 individual 50 μm2 pixels
Also have 30 6 mm2 SensL SiPMs that we will begin testing
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Beginning with optical mounting used in
T2K near detector
optical ferrule
MPPC
foam spring
inner housing
connector (transition) board
outer housing
Designed by Dave Warner at CSU
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Test to discover if the
mechanical components of our
photo-sensors could withstand
cryogenic temperatures
Submerged
SiPM
into liquid
nitrogen
for 24 hours
Found that SiPM and
module was mechanically
unaffected by being lowered
to cryogenic temperatures
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Observe
widening of
waveform at lower
temperatures
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Able to distinguish up to individual PE using
395 nm LED and fiber in liquid nitrogen
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Observe expected decrease in dark rate with lower temperatures using nitrogen vapor
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Spectrum from <1% TPB unclad 3 mm x 3 mm doped fibers
No signal from similar fiber with ~25 μm of cladding
Courtesy Victor Gehman LBNL
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40 L test dewar in
place
Have completed
vacuum, GAr purge
and LAr fill cycle
Installed capacitive
depth sensor
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Mount for holding
WLS-fibers or bars
Can test prototype
fibers/bars in 40 L
dewar
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500 L cryostat
Designed to
accommodate
full length
detector
elements for
LBNE
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Frame and 1-ton
crane in place to
support dewar
Currently working on
vacuum, plumbing,
and safety systems
Plan to be operational
by July 2013
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Have begun simulating WLS-Fibers in
CDDF 40 L and 500 L dewars with Geant4• Goal to model different fiber geometries and
compare with data
Plan to move to simulations with LArSoft
in the near future
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We are developing a fiber-based photon detector prototype for use in the LBNE far detector.
A cryogenic detector development facility is currently being constructed for full operation in July 2013
Following R&D of the PD prototypes we are planning to take an active roll in continued PD development and quality assurance.
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