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Need for New Ideas and Options

This article discusses the need for new ideas and options in the search for lepton flavor violation, focusing on the history of searches and the current experimental goals. The article also explores the role of the Muon Electron Conversion Club and conceptual design issues in these experiments.

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Need for New Ideas and Options

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  1. Need for New Ideas and Options Rashid Djilkibaev New York University

  2. History of Lepton Flavor Violation Searches 1 - N  e-N +  e+ +  e+ e+ e- 10-2 10-4 10-6 Branching Fraction Upper Limit 10-8 MEGA K0 +e-K+ + +e- 10-10 SINDRUM2 10-12 MEG goal 10-14 10-16 MEC goal 1940 1950 1960 1970 1980 1990 2000 2010 Rashid Djilkibaev, NYU Need for New Ideas & Options

  3. 10 -11 10 -10 10 -13 10 -12 10 -15 10 -14 10 -17 10 -16 10 -19 10 -18 10 -21 10 -20 SUSY Predictions for LFV Processes Slepton mixing MEGA bound SINDRUM2 bound Re B(  e g) MEG phase 2goal (start 2006) MEC goal 100 200 300 100 200 300 Rashid Djilkibaev, NYU Need for New Ideas & Options

  4. Lepton Flavor Violation • MEG experiment (PSI) => Br – 10-14 begin – 2006, results – 2008-2009 • ATLAS, CMS (LHC CERN) Beyond Standard Model - SUSY, … begin – 2007, first results – 2009 Int. Lum – 100 pb-1 SUSY c-s ~ 20 pb, Detect ~ 2000 events full intensity – 2009-2011 Int. Lum – 100 fb-1 SUSY LFV c-s ~ 20 fb Detect ~ 2000 events • We will know in 2009 whether LVF exists or not • Now is not a good time to apply for a new MEC experiment grant Rashid Djilkibaev, NYU Need for New Ideas & Options

  5. Scenarios for 2009 Rashid Djilkibaev, NYU Need for New Ideas & Options

  6. Muon Electron Conversion Club • The Muon Electron Conversion Club is an informal structure consisting of volunteers using small fraction of working time • The club goal is to make a new conceptual design for 2009 • Why do we need a new design? 1) MELC (MECO) idea was proposed at 1987 – 19 years ago 2) MECO cost increased by a factor of 2 due to magnet cost increase. Magnet – 55 M$, detector – 25 M$, Total coast – 80 M$ If we can reduce the magnet cost by half it would great for an experiment (50 M$) 3) New idea has appeared – Phase Rotation Linac & Ring (FFAG) to improve muon beam performance Rashid Djilkibaev, NYU Need for New Ideas & Options

  7. Conceptual Design Issues • Magnet System • Phase Rotation Ring or Linac • Proton Beam Time Structure • Detector System Rashid Djilkibaev, NYU Need for New Ideas & Options

  8. Proton & Muon Beams • MELC for Meson Factories 0.6 GeV – 200 µA (1.2 x 1015 p ) proton beam power - 120 kW muon stopping rate – 1011 muon/sec • MECO for BNL AGS 8 GeV – 4 x 1013 p proton beam power - 50 kW muon stopping rate – 1011 muon/sec • PRISM for JHP 50 GeV – 4 x 1014 p proton beam power – 3.3 MW muon stopping rate – 2 x 1011 muon/sec • Future upgrade of FNAL Linac 8 GeV – 1.5 x 1015 p proton beam power - 2 MW muon stopping rate – 4 x 1012 muon/sec Rashid Djilkibaev, NYU Need for New Ideas & Options

  9. MIT Design of MECO Magnet SystemMagnet Cost 55 M$Magnet Cost (M$) ~ 0.5 x E0.66 ~ 15 M$ ~ 10 + 3 + 5 = 18 M$ 5 T 2.5 T • 150 MJ stored energy PD-100+TS-15 + DS-35 • 5T maximum field • Uses surplus SSC cable • Can be built in industry 2 T 1 T 1 T Rashid Djilkibaev, NYU Need for New Ideas & Options

  10. The MECO Apparatus Straw Tracker Muon Stopping Target Muon Beam Stop Superconducting Transport Solenoid (2.5 T – 2.1 T) Crystal Calorimeter Superconducting Detector Solenoid (2.0 T – 1.0 T) Superconducting Production Solenoid (5.0 T – 2.5 T) Collimators Rashid Djilkibaev, NYU Need for New Ideas & Options

  11. PRISM JHP 50 GeV • FFAG acceptance Horizontal - 35000 π mm mrad = 100 mm rad Vertical - 3000 π mm mrad = 10 mm rad • Phase Rotation Values : • Pure µ- - beam • Suppression of e- and π- Rashid Djilkibaev, NYU Need for New Ideas & Options

  12. MECO Muon Beam & FFAG • MECO muon beam vertical & horizontal phase space – 400 mm rad Total phase space 100 times bigger than FFAG acceptance • FFAG acceptance: vertical - 100 mm rad, horizontal – 10 mm rad Rashid Djilkibaev, NYU Need for New Ideas & Options

  13. MUSIC Project • MUon Science Innovation Collaboration - TRIUMF Canada • Budget Outline MECO MUSIC Magnet 55 M$ 27M$ Detector +etc.. 25M$ 31M$ Cyclotron Modific. AGS? 12M$ Total 80M$ 70M$ Operation Costs 130M$/year ? 18M$/ 15 years Rashid Djilkibaev, NYU Need for New Ideas & Options

  14. FFAG Questions • FFAG Matching Phase Space Problem ? • FFAG takes care of extinction ? • What is gain from narrow µ-beam spread of FFAG ? Rashid Djilkibaev, NYU Need for New Ideas & Options

  15. Conceptual Design Issues • Magnet System (Cost issue) • Phase Rotation Ring FFAG (Matching Phase Space Problem, FFAG take care of extinction ) • Proton Beam Time Structure (Extinction & Duty cycle issues) • Detector System Rashid Djilkibaev, NYU Need for New Ideas & Options

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