1. MUON COLLIDER: R&D Status & Opportunities for Participation FNAL, February 24, 2011   1.Motivation & OverviewSteve Geer 2.Accelerator R&DVladimir Shiltsev 3.Physics & Detector StudiesRon Lipton

2. DECISION TREE Steve Geer FNAL W&C 24 February, 20112 Pierre Oddone

3. MOTIVATION Steve Geer FNAL W&C 24 February, 20113 COST PHYSICS  If we can build a muon collider, it is an attractive multi-TeV lepton collider option because muons don’t radiate as readily as electrons (m  / m e ~ 207): - COMPACT Fits on laboratory site - MULTI-PASS ACCELERATION Cost Effective operation & construction - MULTIPASS COLLISIONS IN A RING (~1000 turns) Relaxed emittance requirements & hence relaxed tolerances - NARROW ENERGY SPREAD Precision scans, kinematic constraints - TWO DETECTORS (2 IPs) -  T bunch ~ 10  s … (e.g. 4 TeV collider) Lots of time for readout Backgrounds don’t pile up - (m  /m e ) 2 = ~40000 Enhanced s-channel rates for Higgs-like particles A 4 TeV Muon Collider would fit on the Fermilab Site

4. ENERGY SPREAD Steve Geer FNAL W&C 24 February, 20114 Beamstrahlung in any e+e- collider  E/E   2

5. PRECISION SCANS Steve Geer FNAL W&C 24 February, 20115 Lucie Linssen, SPC, 15/6/2009 ENERGY SCAN     with ISR+BStr (Eichten) e + e - with ISR e + e - with ISR+BStr

6. CHALLENGES Muons are produced as tertiary particles. To make enough of them we must start with a MW scale proton source & target facility. Muons decay  everything must be done fast and we must deal with the decay electrons (& neutrinos for CM energies above ~3 TeV). Muons are born within a large 6D phase-space. For a MC we must cool them by O(10 6 ) before they decay  New cooling technique (ionization cooling) must be demonstrated, and it requires components with demanding performance (NCRF in magnetic channel, high field solenoids.) After cooling, beams still have relatively large emittance. Steve Geer FNAL W&C 24 February, 20116

7. MUON COLLIDER SCHEMATIC Steve Geer FNAL W&C 24 February, 20117 Proton source: Upgraded PROJECT X (~4 MW, 2±1 ns long bunches) 10 21 muons per year that fit within the acceptance of an accelerator √s = 1.5 TeV Circumference = 2.75 km L = 1×10 34 cm -2 s -1  /bunch = 2x10 12  (p)/p = 0.1%   N = 25  m  * = 1cm

8. Muon Collider cf. Neutrino Factory Steve Geer FNAL W&C 24 February, 20118 NEUTRINO FACTORY MUON COLLIDER In present MC baseline design, Front End is same as for NF

9. PROGRESS OVER THE LAST DECADE Successful completion of NF feasibility studies 1, 2, 2a, & International Scoping Study; launching of the ongoing International Design Study for a NF (IDS-NF). Successful demonstration of the target technology (MERIT: Mercury jet in 15T solenoid hit by intense beam) Conceptual development & simulation of a complete, self-consistent, muon cooling scheme (further conceptual development probably needed). Built a unique accelerator R&D facility (MuCool Test Area) at end of FNAL Linac for testing cooling channel components. Launching of MICE: international ionization cooling experiment at RAL. First multi-TeV Muon Collider ring design & magnet concepts (to operate in decay background environment) First detector background studies (10 years ago), & launching of 2 nd generation of studies (now). Steve Geer FNAL W&C 24 February, 20119

10. PROGRESS ( continued) Steve Geer FNAL W&C 24 February, 201110 With a 4MW proton source, this will enable O(10 21 ) muons/year to be produced, bunched, & cooled (by a factor O(10) ) to fit within the acceptance of an accelerator. Palmer Have developed & simulated a self consistent cooling scheme that can yield the required O(10 6 ) cooling factor. Some of the components needed for these schemes are beyond state-of-art, require (bench-top-type) R&D, with perhaps some new inventions along the way. Neuffer 57m 32m 36m100m

11. THE MAP INITIATIVE IN THE U.S. (http://map.fnal.gov) Oct 1, 2009 letter from Denis Kovar to FNAL Director: “Our office believes that it is timely to mount a concerted national R&D program that addresses the technical challenges and feasibility issues relevant to the capabilities needed for future Neutrino Factory and multi-TeV Muon Collider facilities....” Letter requested a new organization for a national Muon Collider & Neutrino Factory R&D program, hosted at FNAL. Muon Accelerator Program Organization is now in place & functioning: 214 participants at birth from 14 institutions: – ANL, BNL, FNAL, Jlab, LBNL, ORNL, SLAC, Cornell, IIT, Princeton, UCB, UCLA, UCR, U-Miss MAP R&D proposal reviewed August 2010 … committee concluded that the “proposed work was very important to the field of high energy physics.” Steve Geer FNAL W&C 24 February, 201111

12. MUON COLLIDER “6 YEAR” R&D PLAN Steve Geer FNAL W&C 24 February, 2011 12 NOW MC Design Feasibility Study 1 2 3 4 5 6 7 Target & Dump Bunch / Phase Initial Cooling 6D Cooling Final Cooling Pre-Acceleration Acceleration Ring MUON COLLIDER PROPOSAL 7. System Prototype 6. Sub-System Beam Tests 5. Semi-realistic sub-systems 4. Early sub-system Bench Tests 3. Component R&D 2. Technical Concept 1. Basic Idea Deliver a Design Study to enable the community to judge the feasibility of a multi-TeV MC, including: (i) an end-to-end simulation of a MC complex based on technologies in-hand or that can be developed with a specified R&D program. (ii) hardware R&D and experimental tests to guide & validate the design work. (iii) Rough cost range.

13. ORGANIZATION/FUNDING EVOLUTION Steve Geer FNAL W&C 24 February, 201113 NFMCC + MCTF Interim MAP FY07 – FY09 Now (FY10/11) ≥FY11 ~4 M$~9 M$~10 M$~15 M$ (requested) First ~10 years

14. PARTICIPATION Steve Geer FNAL W&C 24 February, 201114 Progress so far has been made by a combination of particle & accelerator scientists & engineers from labs & universities. The ongoing R&D challenges include: – Understanding how to get high-gradient RF cavities operating in external magnetic fields (bench tests and beam tests). – Understanding how to make very high filed solenoids using HTS. – Designing, building & testing sections of an ionization cooling channel. – Simulating the accelerator complex & understanding the required component performance. – Simulating detector backgrounds and understanding detector requirements … inventing detector solutions as needed. These activities provide opportunities to invent new things & make high-impact contributions.

15. Steve Geer FNAL W&C 24 February, 201115 http://conferences.fnal.gov/muon11/

16. Steve Geer FNAL W&C 24 February, 201116 Accelerator R&DVladimir Shiltsev Physics & Detector StudiesRon Lipton To learn more, feel free to contact any of us. Also: http://map.fnal.gov/http://map.fnal.gov/