The NO n A Experiment

Fermilab

Dr. O’Sheg OshinowoIWAA2010 Conference

DESY, Hamburg, Germany

September 13-17, 2010

The NOA Experiment

Gary Feldman

Harvard University

Survey of the NOvA Near Detector at

Fermilab

Babatunde O’Sheg OshinowoHorst Friedsam

Fermi National Accelerator Laboratory Batavia, Illinois

Fermilab



September 13-17, 2010The NOvA Experiment

• NOvA is a second-generation experiment on the NuMI beamline

• The NOvA project also includes accelerator upgrades to bring the NuMI beam intensity from 400 kW to 700 kW

• Main physics goal will be the study of e oscillations

• Uses two detectors: Far Detector in Ash River, Minnesota Near Detector at Fermilab• Run for 6 years

NOA: NuMI Off-Axis e Appearance Experimente = electron neutrino

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Ash River

Minneapolis

Duluth

International Falls

Fermilab

Ash River

Minneapolis

Duluth

International Falls

Fermilab

Ash River

VoyageursNational Park(shaded brown)

Ash River

VoyageursNational Park(shaded brown)

• This site is at 810 km from Fermilab, 12 km off-axis• The Ash River site is the farthest available site from Fermilab in

the U.S. along the NuMI beamline

Far Detector Site

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September 13-17, 2010Near Detector Cavern

The Near Detector will be placed underground on the Fermilab site 1 km off-axis, in a cavern adjacent to the MINOS access tunnel

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What is NOvA?

NOvA is:• A 15 kTon Far Detector sited 13.6 mrad off the NuMI beam axis at a distance of 810 km at a distance of 12 km• A 222 ton Near Detector identical to the far detector sited 13.6 mrad off the NuMI beam axis at a distance of 1 km• An 84 Ton IPND (Integration Prototype Near Detector) identical to the Near Detector sited on the surface 107 mrad off the NuMI beam axis in the NOvA Near Detector Surface Building

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NOvA Detector

• The NOvA detectors are constructed from planes of PVC modulesThe NOvA detector module forms the base unit for the detector Extrusions have a cellular structure, with 16 isolated cells per extrusion Each module is made from two 16 cell high reflectivity PVC extrusions bonded into a single 32 cell module L = 15.7 m for Far Detector L = 4.2 m for Near DetectorModules capped by a Manifold and an End Plate/Cap to contain the liquid scintillator Vertical plane = Two extrusion modules

(64 cells wide) Horizontal plane three extrusion modules (96 cells high)

PVC Extrusion

PVC Module= Module Plane

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NOvA Block

• The NOvA detector is constructed from alternating layers (planes) of vertical and horizontal PVC extrusion modules, connected together by glue between layers.

• The basic structural unit of the detector is a subassembly of 31 planes of PVC extrusion modules called a Block

• With an odd number of planes per block, there are two possible configurations: Vertical block (V) when the first and last planes are vertical modules V = v0h1v2h3v4h5v6h7v8h9v10 ….. v20h21v22h23v24h25v26h27v28h29v30 Horizontal block (H) when the first and last planes are horizontal modules

H = h0v1h2v3h4v5h6v7h8v9h10 ….. h20v21h22v23h24v25h26v27h28v29h30

number of planes is counted from 0 through 30

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• The total number of planes in the far detector is 1003 (505 vertical, 498 horizontal), 32 blocks with 31 planes each and 1 block with 11 planes. • Twelve (12) extrusion modules get placed side by side on a flat assembly table to form one plane of the far detector

• The Far Detector (FD) consists of 33 blocks 20 “V” and 13 “H" blocks: FD V0H1V2H3V4 V5……..V25H26V27H28V29 V30H31V32

where the number of blocks is counted from 0 through 32.

O’Sheg

Far Detector

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Integration Prototype Near Detector (IPND)

4 blocks = IPND

• Constructing prototype detector to run on the surface near NOvA Near Detector Surface Building

• The IPND consists of 4 Blocks:

IPND V0H1V2H3

where the number of blocks is counted from 0 through 5

• 2.9 m wide• 4.2 m tall• 8.4 m long

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September 13-17, 2010NOvA Near

Detector• The Near Detector (ND) consists of 6 Blocks:

ND V0H1V2H3V4V5

where the number of blocks is counted from 0 through 5

• 2.9 m wide• 4.2 m tall• 14.3 m long

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Survey of NOvA Near Detector

• Establish a precision horizontal and vertical control network for positioning the Near Detector in the Local Tunnel Coordinate System (LTCS)

• The network consists of both horizontal and vertical networks using several wall monuments and pass points in the NOvA Near Detector Surface Building (NDSB)

• Tie the new NDSB horizontal and vertical network was tied to the existing surface network used for the NuMI project

• Magnet Rings used as Fiducials

• Fiducials are glued with 24-Hour Epoxy

Magnet Ring (19 mm OD, 12 mm ID and 10 mm thick N40 super magnet)

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September 13-17, 2010Survey Methodology

All Survey for the near detector was done with:

• An API Tracker3 Laser Tracker and Spatial AnalyzerTM

- 3-D Accuracy : Accuracy of a Coordinate: ± 5 μm/m - Interferometer: Accuracy of IFM: 1 μm/m - ADM: Accuracy ±15 μm or 1.5 μm/m (whichever is

greater)

• Leica HDS6100 Laser Scanner system and its associated software

- Full 360° x 310° field-of-view and extended range of up to 79 m. - Accuracy of single measurement is: Position 5 mm 1 m to 25 m range; 9 mm to 50 m range

Overall Survey Tolerance:• Relative 2 mm (Horizontal) edge to edge;• Relative 0.75 mm or better (Vertical) between adjacent pieces• Angular tolerance of ± 2 mm/15.7 m = ± 0.13 mrad

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September 13-17, 2010Block Fiducialization

• Total of 24 fiducials are used for each block, 18 on the model extrusions and 6 on the blue steel base plate.

• There 9 fiducials on the extrusions at about the first, middle and last planes and 3 on the base plate on the east side of the block

• The same number of fiducials is on the west side.

• Magnet Rings used as Fiducials

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Block Referencing

• The fiducialized blocks were referenced using the Laser Tracker in a local magnet coordinate system the in MINOS Service Building prior to installation in the NOvA Near Detector Surface Building

• Blocks with Fiducials were Referenced in two parts:

- Reference Part 1: Block in Prone Position

- Reference Part 2: Block in Upright Position

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September 13-17, 2010Part 1: Block in Prone Position

• Measured the local control points in the MINOS Service Building • Measured all 24 Block fiducials• Groove measurements on Block were made at specified locations by placing the SMR where the horizontal module grooves intersect the extreme end of the vertical plane• The bottom of the SMR sat in the horizontal groove while the one side of the SMR touched the vertical plane

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September 13-17, 2010Part 2: Block in Upright Position

• Measured the local control points in the MINOS Service Building• Measured all 24 Block fiducials• Performed best-fit transformations to transform all the Prone Position measurements into the Upright Position measurements.• Measured the upstream and downstream surfaces of the Block. This was done with 8 scans along the edges of each module.• Computed plane fit for each surface and the vector differences to the corresponding measurements• Reported vectors graphically.

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Referencing Methods used• Plane Fits• Plane-Plane Intersections• 3-Plane Intersections • Line Fits• Line-Line Intersections

Block Corner Positions

Block is defined by the 8 Corners computed from plane fits to all measurements

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September 13-17, 2010Block Data Reporting

• Graphical Output of Roll, Pitch, Yaw Offsets dX, dY, dZ

• Able to easily identify the missing groove measurements and/or outliers due to too much glue

• Perform best-fit transformations to transform all the Ideal position locations [xI, yI, zI] generated for each module into the Measurement coordinate system [xM, yM, zM]

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IPND Assembly

• Blocks are moved into the NOvA Near Detector Building for assembly

• 5 out of 6 Blocks have been assembled

Five BlocksAssembled in NOvA Building

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Challenges

• Excessive Glue in the Grooves

• Residual Black Paint in the Groove and on the Vertical Module

• RTV Silicone Adhesive on the Vertical Module

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September 13-17, 2010Status NOvA Near Detector

• IPND installation is completed. • No Liquid Scincillator fill yet.• 6th Block to be referenced and installed by beginning of October, 2010• Muon Catcher to be referenced and installed by mid-October, 2010• Survey of the 6 Blocks and Muon Catcher in the NOvA Near Detector Building by end of October, 2010• 4th detector block ready to take data (IPND) by beginning of November, 2010• Near detector ready to take data by mid-November, 2010• Survey of the 6 Blocks in the MINOS Tunnel by Fall of 2011

Five BlocksAssembled in NOvA Building

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Conclusions

• The survey methodology used has been presented

• The NOvA Near Detector survey is in progress

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I would like to thank • Alignment and Metrology Group members who participated in the NOvA Near Detector project, especially Gary Crutcher who did a lot of the data processing

• Dr. Pat Lukens and Dr. Ting Miao - NOvA Collaboration

Acknowledgment

Danke

Frage?

Documents

The NO n A Experiment