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Need for New Ideas and Options

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

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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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