Opportunities for Experiments Based on Stored Muon Beams at Fermilab (in next ~5 -10 years, for ~3 -20 M$) Milorad Popovic MAP Winter Meeting December, 2014
Motivation • Measure neutrino cross-section with better than 10% precision • Take advantage of the existing accelerator complex configuration providing beam to the New Muon g-2 Experiment • Utilize existing detectors (Micro. Boo. NE, ICARUS) • Minimize initial investment. Providing a suitable building to house the detector would be the only investment required • Describe possible improvements in collecting and storing muons that would allow cross-section measurements with a precision of a few percent with a modest additional investment. • Provide a suitable test facility for future NF December 5, 2014 2
Muon Campus = Mu 2 e + g-2 + ? ? ? p/m g-2 Mu 2 e n 3
Proton Beam Like for g-2, but with g-2 off • • • 5 x 1012 protons in a Booster pulse 3 Hz, 8 Ge. V Booster Muons are stored for ~100 turns Running time 107 Sec (1 year) 100 ton detector, 10 meters downstream from ring ~ 400 CC neutrino events This is for about the cost of moving an existing detector (m. Boo. NE? ? , 60 T) and building a new detector housing (about 3 M$) December 5, 2014 4
Looking in the near future ( cost~$0. 0) • • • 1 x 1013 protons from MI (two Booster pulses slip stacked) 1 Hz, 120 Ge. V MI Muons are stored for ~100 turns Running time 1 year(107 Sec) 100 ton detector, 10 meters downstream from ring ~ 5 x 400 CC neutrino events December 5, 2014 5
Looking Into the Future ( cost~$? ? ) • 1 x 1013 protons from MI (two Booster pulses, slip stacked) • 1 Hz, 120 Ge. V MI • New Li lens r = 2 cm to increase collection of pi’s ( x 1. 5) CERN has made this size Lens • Make ring to be racetrack (x 1. 5 x 2) Provide a suitable test facility for future NF • Running time 1 year(107 Sec) Fermilab year is ~210 7 Sec • Larger detector, ~500 ton detector( x 5) ICARUS is 600 ton ~45000 CC neutrino events (1. 5 x 2 x 5 x 5 x 400) December 5, 2014 6
Questions ? The End December 5, 2014 7
SBN Program August 15, 2014 8
The Context • We revisit the idea of using the Debuncher as a storage ring for muons • the g-2 Experiment expects 6 x 10 -6 stored muons per 8 Ge. V proton on target December 5, 2014 9
g-2 Experiment • Booster pulse(5 x 1012 Protons@ 8 Ge. V) is separated in 4 bunches (~100 ns long) in the Recycler • The Booster is a 15 Hz machine (not all cycles are used) • Target Station is AP 0 (Antiproton production target station) and was run with beam power up to 72 k. W ( 120 Ge. V beam from Main Injector) • 3. 1 Ge. V/c Pions/Muons are collected using Lithium Lens ( this lens was used for collection of 8. 9 Ge. V/c Antiprotons with ~0. 5 Hz) • Debuncher is used as delay line for muons (beam is stored for 3 turns). • Muons go to g-2 storage ring for experiment. December 5, 2014 10
Concept: g-2 Experiment 6 x 10 -6 stored muons in the Debuncher per 8 Ge. V proton on target 11
G 4 Beam. Line simulations of g-2 • In simulation 1. 4 x 1010 protons on AP 0 target p p at end of transfer line December 5, 2014 after Li lens p after one turn Debuncher 12
g-2 simulations 6 x 10 -6 stored muons in the Debuncher per one 8 Ge. V proton on target m after Li lens m after one turn in Debuncher m at the end of transfer line December 5, 2014 13
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