Fundamental aspects of muon beams submitted to Accelerator R&D panel for GARD funding consideration by J.P.Delahaye/SLAC & Robert D. Ryne/LBNL

Accelerator R&D Panel MAP 2014 Winter Meeting, Dec 04, 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 ( 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 J.P.Delahaye Seminar D.Hartill Dec 5 Seminar D.Hartill Dec 5

General Accelerator R&D (GARD) J.P.Delahaye MAP 2014 Winter Meeting, Dec 04, 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 Total FY15 GARD budget: 71 M$ Non already committed: ~ 42 M$ Advanced acceleration: ~ 40%*71(42)M$ = 28 (16) M$

White Papers to the AR&D Panel All public submissions are posted at ( 4 MAP related white papers accessible from a link at map.fnal.gov ( –Muon Accelerator 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 MuCool Test Area, by D. Bowring, K. Yonehara, Y. Torun –Fundamental Aspects of Muon Beams, by J.-P. Delahaye and R.D. Ryne MAP 2014 Winter Meeting, Dec 04, J.P.Delahaye Submitted for GARD funding Next presentation Submitted for GARD funding Next presentation Submitted for GARD funding This presentation Submitted for GARD funding This presentation

Fundamental Aspects of Muon Beams 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 MAP 2014 Winter Meeting, Dec 04, J.P.Delahaye As presented on Dec 4 As presented on Dec 4

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

High Intensity Muon Sources 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) MAP 2014 Winter Meeting, Dec 04, J.P.Delahaye D.Stratakis Dec 4 D.Stratakis Dec 4

High Brightness Muon Sources Goal: Explore the intensity limits of 6D Cooling concepts to reduce the emittance to produce bright (i.e. high-intensity, low emittance) muon beams –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: MAP 2014 Winter Meeting, Dec 04, –Performance specs and lattices for 6D cooling channels –Analyses and infrastructure to help incorporate MICE results into cooling codes J.P.Delahaye P.Snopok Dec 4 P.Snopok Dec 4

Fast Muon Acceleration Goal: Explore the performance limits of the rapid acceleration of muons –Dual use linac concept, recirculating linacs w/ multi- pass arcs, RCS w/ hybrid option –Performance, stageability and 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 MAP 2014 Winter Meeting, Dec 04, J.P.Delahaye A.Bogacz Dec 4 A.Bogacz Dec 4

Muon Storage & Collider Rings 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) MAP 2014 Winter Meeting, Dec 04, J.P.Delahaye Y.Alexahin Dec 4 Y.Alexahin Dec 4

Resources SubjectFTE*M$ High intensity muon sources2 High brightness muon sources2.5 Fast Muon Acceleration1 Muon Storage and Collider Rings1.5 Management0.5 Total M$ J.P.Delahaye MAP 2014 Winter Meeting, Dec 04, 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

Summary 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) MAP 2014 Winter Meeting, Dec 04, J.P.Delahaye