J. Musser for the MINOS Collatoration 2002 FNAL Users Meeting NUMI/MINOS Status J. Musser for the MINOS Collatoration 2002 FNAL Users Meeting

Summary Quick summary of status of directly relevant neutrino oscillation results. Even quicker summary of MINOS physics reach. Status of construction at far and near sites. Results from ‘CalDet’ test beam running Results from Far Detector commissioning and data taking using cosmics. Bottom Line: Everything looking good!

SuperK Status (Neutrino 02)

SuperK nt Detection

3 Component Mixing

K2K Allowed Region Far Detector event sample: 56 FC events

MINOS Physics Goals Demonstrate presence of oscillations. A number of detection channels are available to us. Best is comparison of near/far CC energy spectrum. The beamline and detectors are designed to do this with a total systematic error of < 2% per 2 GeV bin. Provide precision measurements of oscillation parameters. Provide determination of flavor participation to 2%. Comparison of oscillation parameters for atmospheric neutrinos and antineutrinos.

CC Energy Distribution Channel Note: 10 kt. Yr. = ~ 2 live years of running. Results still statistics limited at that time.

CC Energy Distribution -Based Limits and Confidence Regions

nm-ne Mixing MINOS will probe U13 in critical SuperK allowed region. Off-axis measurements facilitate studies of this channel.

Far Detector: 5400 tons Near Detector: 980 tons Det. 2 Det. 1

The Far Detector 8m octagonal steel & scintillator tracking calorimeter Sampling every 2.54 cm 4cm wide strips of scintillator 2 sections, 15m each 5.4 kton total mass 55%/E for hadrons 23%/E for electrons 486 planes of scintillator 95,000 strips

The Near Detector 3.8 x 4.8m “octagonal” steel & scintillator tracking calorimeter Sampling every 2.54 cm 4cm wide strips of scintillator 1 sections, 16.6m length 0.98 kton total mass 55%/E for hadrons 23%/E for electrons 282 planes of steel 153 planes of scintillator 11,616 strips

MINOS Active Detector

FarDet Plane Installation Top view, showing fiber readout cables Plane view, looking South

Far Detector Installation Planes are now being installed and checked out at a rate of roughly 6 per week. This exceeds our original installation rate estimates. Next milestone: Energizing the magnetic field on the first Supermodule (1/2 far detector). This takes place in July, and represents the halfway point in far detector installation. Commissioning and CR-based physics running on the Far Detector is taking place during installation - some results later in the talk.

Near Detector Construction Scint. Modules Installed on Near Detector Plane. Assembly Area in New Muon Lab

NUMI Tunnel and Hall Construction Target Shaft Area MINOS Shaft Area Bulkheads Decay pipe (546 ft of 2193ft) MINOS Service Target Service Bldg Beam Absorber Access Tunnel 1,250ft 600ft 225ft 2,193ft MINOS Target Service Service Bldg . EAV-1 EAV-2&3 EAV-4 Extraction Hall Decay Tunnel MINOS Sump (21’6”D + 4’walkway) Beam Absorber MINOS Hall Tunnel Carrier Tunnel (10’ x 10’) Muon Detectors MINOS Hall Target Hall (35’W x 32’H x 150’L) (25’W x 30-60’H x 175’L) MINOS Near Detector Excavated Excavation Complete! Decay Pipe now being laid in.

Tunnel Construction Work is proceeding on schedule. Decay walkway forms on the right (5/2/02) Work is proceeding on schedule. Should be complete this fall.

Beam Component Testing and Construction Horn 2 Out Conductor. Horn 1 Prototype 8x106 Cycles

CalDet @ CERN T11 Electronics and PMTs Exposed to 1-3.5 GeV tagged electrons/hadrons in T11 beam 60 planes (30X x 30Y) Far Detector electronics used in FY 02 run. Future running with near detector electronics, higher energies.

Low Energy Electron Events Typical 2 GeV Electron Event.

MINOS Response to EM Energy Deposition Signal (MIPs) vs. Beam Momentum s2 vs. 1/Beam Momentum Momentum Momentum Expected resolution, 23%/E constant term <5% Preliminary

Hadronic Events in MINOS (CalDet Data) Sample Pion Events Sample Proton Events Even Plane view Odd Plane view Strip Relative Pulse Height 3.5 GeV 2 GeV 1 GeV

Hadron Energy Distributions Pion MEU distributions Proton MEU Distributions 1 GeV 1.6 GeV 1 GeV 1.6 GeV 2 GeV 2.5 GeV 2 GeV 2.5 GeV 3 GeV 3.5 GeV 3 GeV 3.5 GeV

CalDet Summary CalDet Preliminary results: EM resolution 23%, as expected Analysis of hadrons in progress Further analysis Tune MC Pattern Recognition More data in 2002-2003 Higher energies Different electronics

Far Detector CR Data Running Detector Commissioning and Performance 11% Variation (s) with over 60% of Production Complete <0.2% below 0.5 nominal light yield. Muon Pulse Height Distribution. Average summed signal is ~ 10 pes/MIP. Average 1 MIP signal has been stable to < 0.5% since Feb.

Neutrino Events in the Far Detector Plane transit times determined to ~ 2 ns m 1/beta n Up/down flux ratio ~ 105 Data taken since Feb

1st Neutrino Event

2nd Neutrino Event

Conclusion Excellent progress is being made on all fronts: Far Detector installation on schedule, now ~ 50% complete Near Detector plane construction ~ 25% complete Excavation now complete at FNAL. Most/all drawing of beam components in hand within 6 months - procurement and fabrication underway. CalDet and Far Detector data shows that detector performance meets our design specifications. Far Detector is online NOW as an atmospheric neutrino detector. On schedule to begin data taking first quarter 2005.