MINERA Fiber/Cables/VSTand JUPITER update

Steven ManlyUniversity of Rochester

DOE Program Review17 July 2005

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University of Rochester, DOE Program Review, 13-14 July 2005

WLS Fibers

Scintillator Plane

Clear Fiber CablesPMT Boxes

MINERA: Optical system - overview

~32,000 channels

~4000 clear 8-fiber cables, light tight

~2000 ODU’s

~12,000 connectors, polished ends

~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

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

MINERA: Optical system - overview

Optical system is huge and critical

Optical system … the nerves of MINERA. 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

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University of Rochester, DOE Program Review, 13-14 July 2005

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

MINERA: Optical system – People and optical system duties

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University of Rochester, DOE Program Review, 13-14 July 2005

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 Y-7 (300 ppm)

MINERA: Optical system - FiberWill 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

Bend test(Budd, Manly, Ruggiero, Park, Chvojka)

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University of Rochester, DOE Program Review, 13-14 July 2005

Clip

Box

Ferrule

MINERA: Optical system - Connectors

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

(Budd, Manly, Ruggiero)

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University of Rochester, DOE Program Review, 13-14 July 2005

MINERA: Optical system - Cables

Clip

Box

Ferrule

Must make clear fiber cables light tight. Use polyurethane “boot” molded around black opaque tubing that surrounds the eight fibers

(Flight, Steinman)

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University of Rochester, DOE Program Review, 13-14 July 2005

MINERA: Optical system – Cables R&D/testing/QC

Light injector boxConnector 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

(Budd, Chvojka, Flight, Park, Ruggiero)

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University of Rochester, DOE Program Review, 13-14 July 2005

MINERA – physics studies -QE MC

Determined Expected MINERA errors

Used GEANT3 Monte Carlo

Determined efficiency and purity vs Q2

Plot shows x=1 cut, use events with (Q2-2m)/calculated error < 2

Put in effects of unfolding resolution smearing both in E and Q2 plots

Axial Form Factor – 4 year runWagenbrun – constituent quark model

(Bodek, Budd)

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University of Rochester, DOE Program Review, 13-14 July 2005

QE cross section vs E

Expected errors on cross section vs E

Compare with world QE data sampleLarge errors and only

marginally consistent

Continuing to work on this for the Technical Design Report

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University of Rochester, DOE Program Review, 13-14 July 2005

MINERA: Vertical Slice Test (VST)

3-layer, 21 scintillator prototype

Mirrored WLS fiber glued into co-extruded scintillator bars and fed into prototype MINERA electronics (no clear fibers or MINERA connectors). Trigger scintillators above and below

Min-I track position resolution measured to be 3.4 mmLed by Budd, analysis by Chvojka

Measured 21 pe/MIP for each layer

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University of Rochester, DOE Program Review, 13-14 July 2005

JUPITER: phenomenology

(Bodek, Bradford, Budd)

JLab Hall A Collaboration, PRL 84 (2000) 1398.

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.

New parameterization(s) needed

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University of Rochester, DOE Program Review, 13-14 July 2005

BBBA 05 parameterization based on work by Kelly plus additional duality constraints

Bradford, Bodek, Budd, Arrington, hep-ex/0602017.

JUPITER: phenomenology

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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

Neutrino structure function measurements and MINOS kinematic coverage – WA59 has error on F2 of 20-30% and done on Ne

JLab coverage

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

From contribution of V. Tvaskis, J. Steinman and R. Bradford to NuInt’05

Log10(x)

Lo

g 10(Q

2)

(Steinman, Manly, Bodek, Bradford)

N fractional error ~ 0.5R

N fractional error ~ 1.5R

R = 0.2 implies 10% error on N and 30% error on N

CVC relates vector structure functions in electron scattering to neutrino counterparts

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

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

From talk by V. Tvaskis at NuInt’05

JUPITER: Hall C

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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.

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)

Coherent o production background electron neutrinos. How often does charge exchange happen? Is there an A

dependence?

Examples of measurements:

Momentum distributions for protons and charged pions in 1- and 2- events (E, Q2, A=H,C,Fe)

ep epo ep+ below 2 threshold

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.

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University of Rochester, DOE Program Review, 13-14 July 2005

Neutral and charged pions look different in detectors.

E is a critical quantity. Tune models that can be used in expts.

i.e., K2K result, E is important

Oscillations

No oscillations

JUPITER: Hall B

Paschos, Schienbein, Yu, hep-ph/0408148

ANP model calculationsK2K Collaboration, hep-ex/0212007.

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University of Rochester, DOE Program Review, 13-14 July 2005

carbon

o

hydrogen

o

Fermi smearing and radiative

corrections ~cancel

o+ acceptance differences ~cancel

Fermi smearing and radiative corrections ~cancel

JUPITER: Hall B

Hydrogen: E=4.462 GeV Carbon: E=4.462 GeV

W W

Invariant mass of Reconstructed pizeros

Progress:

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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 MINERA by spring.

Complete single module prototype (Rochester production of cables and fiber, construction of module mapper)

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

Additional MINERA 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.)

Requests

Additional MINERA 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 MINERA MC.

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 MINERA.