Fundamental Aspects of Muon Beams: Advancing Accelerator R&D

1. Fundamental aspects of muon beamssubmitted to Accelerator R&D panelfor GARD funding consideration by J.P.Delahaye/SLAC & Robert D. Ryne/LBNL

2. Accelerator R&D Panel Seminar D.Hartill Dec 5 • P5 recommendations (May 2014): • Reassess MAP as project with dedicated DOE funding • Incorporate into the General Accelerator R&D (GARD) (FY14 ~ 85 M$) the MAP activities that are of importance to Accelerator R&D • Highlighted the importance of accelerator R&D • Set-up a subpanel to examine the research in current HEP accelerator R&D program and to identify the most promising research areas to support the advancement of high energy & particle physics. • HEPAP Accelerator R&D Panel (http://www.usparticlephysics.org/p5/ards) • Mandate: • Define appropriate goals in broad terms for medium ( < 10 years ) and long term (<20 years ) U. S. Accelerator R&D of a world leading future program in accelerator based particle physics consistent with P5 recommendations • Maintaining a healthy and appropriately balanced national program • Provide guidance for a plan based on the science & technology case for increased investment in HEP Accelerator R&D called for in P5’s Scenario C • Recommendations: March 2015 • Resources: from FY 16 = Oct 2015 MAP 2014 Winter Meeting, Dec 04, 2014

3. General Accelerator R&D (GARD) Total FY15 GARD budget: 71 M$ Non already committed: ~ 42 M$ Advanced acceleration: ~ 40%*71(42)M$ = 28 (16) M$ Advanced acceleration: • Normal conducting RF structures and sources • Wakefield accelerators • Beam driven plasma wakefield acceleration • Laser driven plasma wakefield acceleration • Dielectric laser acceleration • Fundamental aspects of muon acceleration • Issues with 100 TeV pp collider MAP 2014 Winter Meeting, Dec 04, 2014

4. White Papers to the AR&D Panel Submitted for GARD funding Next presentation Submitted for GARD funding This presentation MAP 2014 Winter Meeting, Dec 04, 2014 • All public submissions are posted at(http://www.usparticlephysics.org/node/1059/webform-results/public) • 4 MAP related white papers accessible from a link at map.fnal.gov (http://map.fnal.gov/documents/white-papers-accelerator-RnD-panel-2014.shtml) • MuonAccelerator R&D Issues, by MAP mgt • The Case for Muon-based Neutrino Beams, by P. Huber, A. Bross, and M. Palmer • Normal-Conducting RF Cavity R&D at the MuCoolTest Area, by D. Bowring, K. Yonehara, Y. Torun • Fundamental Aspects of Muon Beams, by J.-P. Delahayeand R.D. Ryne

5. Fundamental Aspects of Muon Beams As presented on Dec 4 MAP 2014 Winter Meeting, Dec 04, 2014 • Refocus on • High Intensity Muon Sources • High Brightness Muon Sources • Fast Muon Acceleration • Muon Storage and Collider Rings • Roughly parallels the Area Systems of the IBS effort, but with different emphasis: • Not oriented toward selecting initial baseline design of a future facility • Is oriented toward determining the limits of the most promising concepts identified by MAP • Reduced scope – modest collider efforts

6. Instead of facility designs, aiming to answer questions such as MAP 2014 Winter Meeting, Dec 04, 2014 • What are the intensity limits of muonbeam generation? • What are the emittance limits of muonbeam cooling? • What are the fundamental limits for rapid acceleration of muons? • What are the fundamental limits of precision neutrino beams generated from stored muons?

7. High Intensity Muon Sources D.Stratakis Dec 4 MAP 2014 Winter Meeting, Dec 04, 2014 • Goal: Explore the intensity limits of high intensity muon beams generated by proton beam striking a target • Redesign Front End based on latest particle distribution from carbon target • Simulations to study energy deposition • Hybrid channel design and optimization (perf, cost) • Examine polarization, other applications • Deliverables: • Design specs for systems required to control particle loss • A design concept and performance results for a buncher and phase-rotator system utilizing gas-filled rf cavities • A report describing potential applications of a muon source • Description of the system modifications required to provide a more highly polarized source of muons(depending on funding)

8. High Brightness Muon Sources P.Snopok Dec 4 • Performance specs and lattices for 6D cooling channels • Analyses and infrastructure to help incorporate MICE results into cooling codes MAP 2014 Winter Meeting, Dec 04, 2014 • Goal: Explore the intensity limits of 6D Cooling concepts to reduce the emittance to produce bright (i.e. high-intensity, low emittance) muonbeams • Hybrid Initial 6D Cooling channel • Limits to late-stage 6D cooling • Final Cooling: limits, alternate concepts (e.g. flat beams) • Understanding the limits to where we can reach near the bottom of the emittance diagram curve • impact to cost of downstream components • Participate in modeling of the MICE Cooling Channel to ensure successful completion of the 3-year ramp-down and to prepare to incorporate the results in our cooling codes • Deliverables:

9. Fast Muon Acceleration A.Bogacz Dec 4 MAP 2014 Winter Meeting, Dec 04, 2014 • Goal: Explore the performance limits of the rapid acceleration of muons • Dual use linacconcept, recirculating linacs w/ multi-pass arcs, RCS w/ hybrid option • Performance, stageabilityand cost • Rapid acceleration essential to optimize muon flux • Losses strongly dependent on longitudinal emittance • If it's prohibitively expensive, it won't get built • Applies to everything, not just fast muon acceleration.P5 recommendation 26: "Focus on outcomes and capabilities that will dramatically improve cost effectiveness for mid-term and far-term accelerators" • Deliverables: • Specs for acceleration systems for rapid acceleration of muons, taking into account what is being learned about cooling limits

10. Muon Storage & Collider Rings Y.Alexahin Dec 4 MAP 2014 Winter Meeting, Dec 04, 2014 • Main goal: analyze and optimize the performance of muon storage rings that would serve as precision neutrino sources • also, document what has been learned regarding HF, 1.5 TeV and 3 TeV designs; modest effort on beam dynamics and instabilities in a higher energy collider • Deliverables: • Report on cost-effective low energy muon storage ring options to strengthen long baseline program • Report on performance of a long baseline NF based on latest results from preceding topics • Report describing results of an initial study of a > 5 TeV ring (depending on funding)

11. Resources The proposed level of yearly effort over a 2-3 year period would allow significant progress. *a mixture of university and laboratory junior researchers suitably supervised by senior laboratory members MAP 2014 Winter Meeting, Dec 04, 2014

12. Summary MAP 2014 Winter Meeting, Dec 04, 2014 • FY2015 a (hopefully) transition year away from facility design, toward fundamental aspects (limits to intensity, brightness,...) focused on: • High Intensity Muon Sources • High Brightness Muon Sources • Fast Muon Acceleration • Muon Storage and Collider Rings • Assuming support from Accelerator R&D panel for GARD support during next 2 to 3 years 1.75 M$ (7.5 FTE) / year from FY16 (Oct15)