Mu2e at Fermilab Ron Ray Fermilab - Mu2e Project Director Muon to - - PowerPoint PPT Presentation
Mu2e at Fermilab Ron Ray Fermilab - Mu2e Project Director Muon to Electron Conversion Proton Beam Muonic Atom Stopping Proton Target Target Electrons Pions decay to Muons 105 MeV electron Signal Magnetic field Current
Ron Ray Fermilab - Mu2e Project Director
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Current state-of-the-art !"# =
% "&'(→#&'( % "&'( *+,-(.# < 7 x 10-13 (90% CL)
Proton Beam Pions decay to Muons Electrons 105 MeV electron
Proton Target Stopping Target
Muonic Atom Signal
Magnetic field
– Radiative Pion Capture (RPC) – Muon and pion decay-in-flight
– Decay-in-Orbit (DIO)
– Radiative Muon Capture (RMC)
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!"#$ → &'()
Radiative Pion Capture Target foils
– Radiative Pion Capture (RPC) – Muon and pion decay-n-flight
– Decay-in-Orbit (DIO)
– Radiative Muon Capture (RMC)
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!"#$ → &'()
Radiative Pion Capture Target foils
High resolution Tracker Pulsed beam + extinction Active Veto Pbar absorbers
4.6 T 2.5 T 2 T 1 T
P r
B e a m
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Mu2e Project scope includes
§ Superconducting Solenoids
Production and Transport System
superconducting solenoid significantly enhances stopped muon yield
charge and momentum range
by MμSIC Collaboration
Stopping Target Production Target End-to-end evacuated warm bore (10-4 – 10-5 Torr) Production Solenoid Transport Solenoid Detector Solenoid
4.6 T 2.5 T 2 T 1 T
P r
B e a m
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Mu2e Project scope includes
§ Superconducting Solenoids § Tracker – Straw drift tubes § Calorimeter – Pure CsI crystals
Calorimeter Tracker 105 MeV electron
Production Solenoid Transport Solenoid Detector Solenoid
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Mu2e Project scope includes
§ Superconducting Solenoids § Tracker – Straw drift tubes § Calorimeter – Pure CsI crystals § Cosmic Ray Veto - Scintillator
Booster
– Booster batch of 4x1012 protons at 15 Hz – re-bunched in the Recycler Ring to 4 bunches extracted one at a time to Delivery Ring – Protons resonantly extracted from the Delivery Ring – 1695 ns pulse spacing – ~40M protons per pulse
simultaneous with NOvA and short baseline neutrino program
– Cannot operate at the same time as g-2
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g-2
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Muons arrive Muonic atoms tµ(AL)=864 ns
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1 2mµ mµ
Electron Energy
e- µ- n n e- n n µ-
Al
Free muon decay DIO
Conversion electron energy
Szafron & Czarnecki, Phys Rev. D94, 051301 (2016)
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Requires Tracker core momentum resolution of better than 200 KeV/c and small tails.
10-2 10-1 1 10 102 103
Events/0.03 MeV/c
100 101 102 103 104 105 106 e- Momentum (MeV/c) 10-3
Mu2e Simulation
mylar walls
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Instrumented Tracker Panel Top half of Tracker Plane Metalized Straw Tube
Blind to peak of DIO spectrum
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signal + DIO simulation with 1000x full run statistics.
wavelength”
(34 x 34 x 200 mm3) read out by SiPMs
– 75% of crystals, 100% of SiPMs in hand
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E/p Simulation
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Energy Resolution
Energy and time resolutions well within requirements
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scattering, or material interactions
efficiency required to be > 99.99%.
when beam is off.
and enter through the hole at the TS entrance
electron background.
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TS Hole
– Scintillator and SiPMs all in hand.
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CRV beam test with 120 GeV protons at Fermilab Test Beam.
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Estimated background for 3.6 x 1020 protons on target
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Mu2e expects a 104 x increase in sensitivity over SINDRUM II
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PS3 coil winding completed. 2 layers, 125 turns/layer DS1 coil winding complete. 2 layers, 73 turns/layer DS1 coil winding
DS Stand DS Cryostat
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TS Assembly Space at HAB First two units installed on warm bore
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Module 7 Module 5,6 Module 2 Module 8 Module 3,4 Module 3,4 Module 1,2 Module 8
More than half of TSu delivered
Module 9 Module 13 Module 12
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Module 14 Module 15 Module 24
Module 26
Module 25
Module 27
Module 22 Module 23 Module 16
Module 18
TSd modules in various stages of fabrication
Module 21 Module 20
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Mu2e Beamline Installation Making Significant Progress
fabricated
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Cosmic Ray Veto Module Construction at University of Virginia Calorimeter crystals and SiPM (INFN Contribution) TDAQ Test Stand Half Tracker Plane comprised of 3 panels
Tracker panel production is behind schedule. Expect to ramp up production rate this Fall at University of Minnesota
Instrumented Tracker Panel
the Solenoids.
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Detectors Solenoids Proton Beamline Physics Data Taking 2022 2023
Construction, checkout, Cosmic Ray Test Construction, checkout, full power cold test Construction, checkout, single-turn extraction
2019 2020 2021
First Physics Data Commission Resonant Extraction Map fields Commissioning & prepare for beam Comission with Beam Project Prepare for Beam Beam Operations
sensitivity of 8 x 10-17 (90% C.L.)
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>220 Scientists from 40 institutions
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between pulses. Require extinction factor of 10-10.
10-4.
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collimator
in-time beam into) the transmission channel, but the 600 kHz bunch rate makes this impossible with present technology.
– 300 kHz (half bunch frequency) to sweep out of time beam into collimators – 4.5 MHz (15th harmonic) to maximize transmission of in-time beam – Beam transmitted at nodes!
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Single harmonic would hit collimator too soon
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POWER&LEADS& FERRITE&BLOCKS&CLAMPS& VACUUM&PUMP&PORTS& VACUUM&BOX&SUPPORT& MAGNET&MODULE&
863.6&mm&
3000.0&mm& 101.6&mm&
Elements individually powered
identical one meter elements, arranged in two 3-meter vacuum vessels.
meter prototype
– meets all specifications
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Testing@ Rutherford-Appleton Lab (England) Target End-of-Arm Tooling@ Fermilab
to monitor beam extinction
beam.
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Dipole Magnet Pixel Planes Trigger Counters
Filter: Selects a “beam” of ~4 GeV/c protons/pions scattered off the target Detector: Mini spectrometer based on ATLAS pixel chips Proton Dump
Detector
thick, 15 cm diameter
tracker rates.
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downstream to limit rates and radiation damage
resolution in energy range of interest
2p→1s X-ray 347 keV
AlCap Data
347 keV 2p→1s muonic X-ray, no time cut
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DAQ Servers (48) General-purpose Networking Event Building Switch Control Hosts Data Logger Timing System Local Control & Monitoring
Stream data in time slices to CPU farm. Employ software trigger filters to identify good events.
35 GBytes/sec
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Tracker – Calorimeter track matching + likelihood analysis
Timing Difference Energy/Momentum
Rejection factor of 200 eliminates this background
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Search for tracker hits with time and azimuthal angle that are compatible with calorimeter cluster (DT < 50 ns). Ø Significantly simplifies pattern recognition.
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experiment makes sense in all scenarios
– Push sensitivity or – Achieve precision to study underlying new physics – white paper, arXiv:1307.1168 – EOI to FNAL PAC arXiv:1802.02599
Precision Measurements Measure conversion rate as a function of Z Higher Sensitivity search
Mu2e Signal?
Yes No
Upgrade Mu2e (Mu2e-II)
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LNP (TeV) k
Loop dominated Contact dominated Derived from A. de Gouvea , P. Vogel arXiv:1303.4097
Mu2e
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By measuring the ratio
stopping targets Mu2e-II can unveil underlying new-physics mechanism
4 1 3 2 20 40 60 80
Z of stopping target D S V1 V2
aluminum titanium lead Ron Ray gold