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Optical System for MicroBooNE. Arati Prakash Massachusetts Institute of Technology Fermi National Accelerator Laboratory. Outline . Introduction - What is MicroBooNE Light in Liquid Argon MicroBooNE PMT System Design. Outline . Introduction - What is MicroBooNE Light in Liquid Argon

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optical system for microboone

Optical System for MicroBooNE

Arati Prakash

Massachusetts Institute of Technology

Fermi National Accelerator Laboratory

outline
Outline
  • Introduction - What is MicroBooNE
  • Light in Liquid Argon
  • MicroBooNE PMT System Design

Arati Prakash

outline1
Outline
  • Introduction - What is MicroBooNE
  • Light in Liquid Argon
  • MicroBooNE PMT System Design

Arati Prakash

microboone experiment
MicroBooNE Experiment
  • 170 ton Liquid Argon Time Projection Chamber (LArTPC)
  • Examine low energy neutrino cross sections
    • Low energy excess observed in MiniBooNE experiment –  or e?
  • Start taking data early 2014
  • Located on axis to the ~1GeV Booster Neutrino Beamline at Fermilab (Chicago, IL)

Arati Prakash

microboone detector design
MicroBooNE Detector Design
  • LArTPC: 3 wire planes with 2.5m drift in 170 tons of LAr
  • Located in a cylindrical cryostat vessel: 4m radius x 12 m length
  • PMT system sits along the wall behind the TPC
    • Charge drifts to the TPC planes T~ms
    • PMT scintillation light detected T ~ns
    • So, the PMT system in principle can trigger the TPC

Arati Prakash

outline2
Outline
  • Introduction - What is MicroBooNE
  • Light in Liquid Argon
  • MicroBooNE PMT System Design

Arati Prakash

lar scintillation light
LAr Scintillation Light

Prompt component: T ~ 6 ns (25%)

Excited molecule

Ar

Excitation

128 nm

Ar2*

Ar*

Ar

Ar

Ar+

Ar2+

Ar2*

Ionization

Ionized molecule

e-

Delayed component: T ~1.6 us (75%)

Arati Prakash

Recombination

outline3
Outline
  • Introduction - What is MicroBooNE
  • Light in Liquid Argon
  • MicroBooNE PMT System Design

Arati Prakash

system requirements
System Requirements
  • In the MicroBooNE E = 500 V/cm, we expect 24,000 photons/MeV
  • Need to trigger on a 40 MeV proton (~30MeV MIP particles) for MicroBooNE
  • Further goal: trigger on a 5 MeV electron to see supernovae events

Arati Prakash

design constraints
Design Constraints
  • PMTs must work efficiently at cryogenic temp (87K)
  • UV light does not pass through glass - Scintillation light (128nm) must be made visible to PMTs
  • Optimize Cost vs. coverage
  • Maintain LAr purity
  • Allow enough space for TPC
  • Longevity of the System

Arati Prakash

choice of pmt
Choice of PMT
  • 30 x 8-inch, 14-stage Hamamatsu cryogenic PMT
  • Gain ~10^9

Arati Prakash

wavelength shifting
Wavelength shifting
  • Scintillation light is produced in the UV ~128nm.
  • We coat acrylic plates with TPB mixture to shift the light into the visible, ~425 nm.

(Previous experiments (ICARUS) coated PMTs directly.)

Arati Prakash

conclusion
Conclusion
  • MicroBooNE will hopefully provide valuable information for LArTPC detector R&D, as well as data that will be informative for understanding the MiniBooNE observed excess etc.
  • Come see my poster!

Thank You

Arati Prakash

microboone people
MicroBooNE People

Brookhaven Lab

Hucheng Chen

Jason Farrell

Francesco Lanni

David Lissauer

Don Makowiecki

Joseph Mead

Susan Duffin

VeljkoRadeka

Sergio Rescia

Jack Sondericker

Craig Thorn

Bo Yu

Kuo-Chen Wu

Princeton

University

Kirk McDonald

Changguo Lu

Qing He

Columbia University

Leslie Camilleri

Rachel Carr

Gary Cheng

Georgia Karagiorgi

CamilloMariani

Bill Seligman

Mike Shaevitz

Bill Willis

Bill Sippach

Cheng-Yi Chi

Los Alamos National

Laboratory

Gerry Garvey

Jackie Gonzales

Bill Louis

Chris Mauger

Geoff Mills

ZarkoPavlovic

Richard Van de Water

Hywel White

Fermilab

Bruce Baller

Cat James

Hans Jostlein

Stephen Pordes

Gina Rameika

Jennifer Raaf

Tinjun Yang

Brian Rebel

Rich Schmitt

Dave Schmitz

Jin-Yuan Wu

Sam Zeller

Herb Greenlee

Mike Kirby

Kansas State

University

Tim Bolton

David McKee

Glenn Horton-Smith

MIT

William Barletta

Len Bugel

Janet M. Conrad

Christina Ignarra

Ben Jones

Teppei Katori

Tess Smidt

Arati Prakash

Michigan State

University

Carl Bromberg

Dan Edmunds

Saint Mary's

University of

Minnesota

Paul Nienaber

Syracuse University

Mitch Soderberg

Yale

Bonnie T. Fleming

Eric Church

Roxanne Guenette

AndrzejSzelc

Josh Spitz

KingaPartyka

Adam Patch

Ellen Klein

Joseph Lozier

University of

Cincinnati

Randy Johnson

University of Texas

at Austin

Sacha Kopp

Karol Lang

Arati Prakash