MinerA Fiber/Cables/VST
and JUPITER update
Steven Manly
University of Rochester
DOE Program Review
17 July 2005
University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Optical system - overview
Clear Fiber Cables
PMT Boxes
WLS Fibers
~32,000 channels
~4000 clear 8-fiber cables, light tight
~2000 ODU’s
~12,000 connectors, polished ends
Scintillator Plane
~90 km of WLS fiber, mirrored on one
end
~65 km of clear fiber
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University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Optical system - overview
Optical system is huge and critical
Optical system … the nerves of MINERA. We must collect enough light, know
our efficiency for doing it and understand the mapping to the PMT’s or the
experiment cannot work.
Requires conservative design and choice of materials, extensive R&D and
testing, careful production, QC during production
Management, design, R&D, creating specs, procurement, qualifying procured
materials, QC procedures, manufacturing procedures, safety during manufacture
and in use, production, QC during production, calibration database, shipping
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University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Optical system – People
and optical system duties
Howard Budd: level 2 manager of fiber and cables, design, R&D, in charge of
VST, design of QC procedures and equipment
Steve Manly: design fibers/cables, procurement of fiber and connectors, clear
cable production, module scanning
Robert Bradford: Module scanner design/construction
Robert Flight: cable light tighting mold and boot design, mechanical interface,
routing of fibers, module scanner design
Jim Steinman: Cable R&D, cable light tighting boot materials and production,
investigating tube material
Jesse Chvojka: fiber R&D (bend tests), VST analysis
Jaewon Park: fiber R&D (attenuation tests)
Dan Ruggiero: connector R&D and QC, production
Janina Gielata: to join in September, cable production
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University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Optical system - Fiber
Will use Kuraray fiber:
WLS: 1.2 mm, 175 ppm (Y-11), S-35, multi-clad
Clear: Kuraray, 1.2 mm, S-35, multi-clad fiber
WLS fiber from VST
Some of the R&D done this year –
Bend tests – 5” diameter bend, important for
fiber routing and mechanical design
Optimize fiber diameter (light output, bend
radius, cost)
Attenuation measurements - light output
Glued vs. unglued in scintillator – light output
Mirrored vs unmirrored – light output
Y-11 (175 ppm) vs expensive Y-7 (300 ppm)
Bend test
(Budd, Manly, Ruggiero, Park, Chvojka)
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University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Optical system - Connectors
(Budd, Manly, Ruggiero)
Clip
Box
Ferrule
Use connectors from Fujikura/DDK
Similar to those used in CDF plug upgrade
1.2 mm fiber means new Ferrule design/mold
First connectors produced had excellent
alignment (good optically) but were rather tight to
connect/disconnect. Currently working with DDK
on modification. New connectors expected to
arrive at FNAL today or tomorrow.
FNAL Ice polish R&D
Polished fiber in connector
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University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Optical system - Cables
Clip
Must make clear fiber cables light tight. Use
Box
polyurethane “boot” molded
around black
opaque tubing that surrounds the eight fibers
Ferrule
(Flight, Steinman)
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University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Optical system – Cables
R&D/testing/QC
(Budd, Chvojka, Flight, Park, Ruggiero)
Light injector box
Connector and cable
attenuation test setup
Real life connector and
cable test in progress
(in dark box)
Results from test showing no
degradation with time of optical
transmissivity of connection
using optical grease
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University of Rochester, DOE Program Review, 13-14 July 2005
MINERA: Vertical Slice Test (VST)
3-layer, 21 scintillator prototype
Mirrored WLS fiber glued into co-extruded scintillator bars and
fed into prototype MINERA electronics (no clear fibers or
MINERA connectors). Trigger scintillators above and below
Measured 21 pe/MIP for each layer
Led by Budd, analysis by Chvojka
Min-I track position resolution
measured to be 3.4 mm
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University of Rochester, DOE Program Review, 13-14 July 2005
JUPITER: phenomenology
(Bodek, Bradford, Budd)
Recent measurements of nucleon
vector form factors in eA scattering
show validity of dipole form factor
parameterization is questionable
eA elastic nucleon form factors used
to get vector QE cross section in
neutrino scattering.
JLab Hall A Collaboration, PRL 84 (2000) 1398.
New parameterization(s) needed
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University of Rochester, DOE Program Review, 13-14 July 2005
JUPITER: phenomenology
Bradford, Bodek, Budd, Arrington, hep-ex/0602017.
BBBA 05 parameterization based on work
by Kelly plus additional duality constraints
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University of Rochester, DOE Program Review, 13-14 July 2005
JUPITER: Hall C – measurement of F2 and
R=L/T on nuclear targets in the nucleon
resonance region
Log10(Q2)
From contribution of V. Tvaskis, J.
Steinman and R. Bradford to NuInt’05
JLab
coverage
(Steinman, Manly, Bodek, Bradford)
E02-109 and E04-001 (Bodek, co-spokesperson)
eA data on H, D, C, Al, Fe targets
Steinman thesis topic: measure F2 and R
Will help  experiments understand cross sections
and nuclear effects
CVC relates vector structure functions in
electron scattering to neutrino counterparts
Log10(x)
Neutrino structure function
measurements and MINOS
kinematic coverage – WA59
has error on F2 of 20-30% and
done on Ne
N fractional error ~ 0.5R
N fractional error ~ 1.5R
R = 0.2 implies 10% error on N and 30%
error on N
See E04-001 proposal at
http://www.pas.rochester.edu/~bodek/jlab/F2-Rnuclear-HallC.pdf
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University of Rochester, DOE Program Review, 13-14 July 2005
JUPITER: Hall C
From talk by V. Tvaskis at NuInt’05
Steinman working primarily with Christy
(Hampton/JLab) and Tvaskis (JLab),
Manly acting as superviser
Keppel (Hampton/JLab), Bodek, Bradford
also involved
Substantial progress made in the last
year and a half
Preliminary cross sections available and
calibrations and charge symmetric
background corrections done
Expect to finish extend to heavier targets
and produce final cross sections and
structure function measurements in the
next 1-1.5 years
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University of Rochester, DOE Program Review, 13-14 July 2005
JUPITER: Hall B (CLAS) – misc. measurements
of exclusive final states in eA scattering to
understand better nuclear effects relevant for 
experiments in the resonance region
(Manly, Bradford and undergrads: Dave Sher, Ian Kleckner, Jennifer Cano)
Manly gave talk on this at JLab neutrino workshop in June. Great interest in
these measurements among neutrino folk.
Examples of measurements:
 Momentum distributions for protons and charged
pions in 1- and 2- events (E, Q2, A=H,C,Fe)
 ep  epo  ep+ below 2 threshold
Allows neutrino MC tuners to take into account
nuclear effects like transparency and absorption in a
brute force way. They can look at data for vector
part and appropriate Q2 only.
How often do you see proton from QE event? (Affects Evis
and event categorization.)
How often do you lose a pion in a resonance or inelastic
event? (Affects Evis and event categorization)
 o/+ ratio as function of W and Q2
Neutral and charged pions look different in  detectors.
Need to understand A dependence.
The reconstructed neutrino energy is a critical quantity for
neutrino expts. Tune models with CLAS measurements.
Coherent o production background electron neutrinos. How
often does charge exchange happen? Is there an A
dependence?
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University of Rochester, DOE Program Review, 13-14 July 2005
JUPITER: Hall B
Neutral and charged pions look different
in  detectors.
E is a critical quantity. Tune models that
can be used in  expts.
No oscillations
Oscillations
i.e., K2K result, E is important
K2K Collaboration, hep-ex/0212007.
Paschos, Schienbein, Yu, hep-ph/0408148
ANP model calculations
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University of Rochester, DOE Program Review, 13-14 July 2005
JUPITER: Hall B
 o 
  
  hydrogen
 o 
  
  carbon
Fermi smearing and radiative
corrections ~cancel
o+ acceptance
differences ~cancel
Fermi smearing and radiative
corrections ~cancel
Progress:
Hydrogen: E=4.462 GeV
Carbon: E=4.462 GeV
W
W
Invariant mass of
Reconstructed pizeros
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University of Rochester, DOE Program Review, 13-14 July 2005
Plans for upcoming year
 Expect CD-1, CD-2, CD-3a approval for MINERA by spring.
 Complete singe module prototype (Rochester production of
cables and fiber, construction of module paper)
 Progress on tracking (multi-module) prototype
 Complete Hall-C F2 and R analysis on nuclear data
 First results from Hall-B on exclusive final states
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University of Rochester, DOE Program Review, 13-14 July 2005
Requests
Additional MINERA graduate student: based at FNAL to help with cable
production and work with single module and multi-module prototypes.
Work on exclusive eA analysis and integration of JUPITER information into
MINERA MC.
Additional MINERA research associate: based at FNAL to supervise module
scanning/production and veto wall construction/installation and play a major
role in detector commissioning. (Bradford is incredibly productive, but will be
working with module construction and needs a little time to do science.)
Continuation of Manly transition: need 2 months summer salary and
travel/computing/operations funds. NP picked up Steinman for one year. This
year NP picking up all travel/computing/operations funds for Manly/Steinman,
including MINERA.
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