Ryan Wasserman

Norm BuchananColorado State University

LIDINE 2013

Fermilab - Batavia,Il

May 30, 2013

LBNE

1

Dave Warner

Andrea Shacklock

Forrest Craft

Tom Cummings

Ryan Held2

Wave Length Shifting-Fiber Prototypes

SiPM Measurements

Facilities Developments

Simulation Effort

3

Proposed Long

Baseline Neutrino

Experiment

Neutrino beam from

Fermilab to

Homestake Mine

10 k-ton LAr-TPC

detector on surface

4

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

5

Designing Fiber/Bar mounting frame for

all LBNE PD testing to fit into

Single PD mount Design frame for LBNE

6

Mounting stand for CSU

dewars being

developed

Plan to use fiber only or

hybrid design to test by

fall

7

Current test stand can

support fibers or bars

that go to SiPM

readout

Designed to be

similar to 35 ton

test specifications

8

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

9

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

10

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

11

Observe

widening of

waveform at lower

temperatures

12

Able to distinguish up to individual PE using

395 nm LED and fiber in liquid nitrogen

13

Observe expected decrease in dark rate with lower temperatures using nitrogen vapor

14

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

15

40 L test dewar in

place

Have completed

vacuum, GAr purge

and LAr fill cycle

Installed capacitive

depth sensor

16

Mount for holding

WLS-fibers or bars

Can test prototype

fibers/bars in 40 L

dewar

17

500 L cryostat

Designed to

accommodate

full length

detector

elements for

LBNE

18

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

19

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

20

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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