MUON COLLIDER: R&D Status & Opportunities for
Participation
FNAL, February 24, 2011
m+ m-
n
1. Motivation & Overview Steve Geer2. Accelerator R&D Vladimir Shiltsev3. Physics & Detector Studies Ron Lipton
MOTIVATION
Steve Geer FNAL W&C 24 February, 2011 3
CO
ST
PH
YS
ICS
· 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 (mm / me ~ 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)- DTbunch ~ 10 ms … (e.g. 4 TeV collider) Lots of time for readout Backgrounds don’t pile up- (mm/me)2 = ~40000 Enhanced s-channel rates for Higgs-like particles
A 4 TeV Muon Collider wouldfit on the Fermilab Site
PRECISION SCANS
Steve Geer FNAL W&C 24 February, 2011 5
Lucie Linssen, SPC, 15/6/2009
ENERGY SCANm+m- with ISR+BStr (Eichten)
e+e- with ISR
e+e- with ISR+BStr
Steve Geer FNAL W&C 24 February, 2011
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(106) 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.
6
MUON COLLIDER SCHEMATIC
Steve Geer FNAL W&C 24 February, 2011 7
Proton source: Upgraded PROJECT X (~4 MW, 2±1 ns long bunches)
1021 muons per year that fit within the acceptance of an accelerator
√s = 1.5 TeV Circumference = 2.75 kmL = 1×1034 cm-2s-1 m/bunch = 2x1012
s(p)/p = 0.1%eN = 25 mm b * = 1cm
Muon Collider cf. Neutrino Factory
Steve Geer FNAL W&C 24 February, 2011 8
NEUTRINOFACTORY
MUONCOLLIDER
In present MC baseline design, Front End is same as for NF
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 2nd
generation of studies (now).
Steve Geer FNAL W&C 24 February, 2011 9
PROGRESS (continued)
Steve Geer FNAL W&C 24 February, 2011 10
With a 4MW proton source, this will enable O(1021) 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(106) 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 36m 100m
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, 2011 11
MUON COLLIDER “6 YEAR” R&D PLAN
Steve Geer FNAL W&C 24 February, 2011
12
NOWMC Design Feasibility Study
1
2
3
4
5
6
7
Targ
et &
Dum
p
Bunch
/ Pha
se
Initia
l Coo
ling
6D C
oolin
g
Final
Coo
ling
Pre-A
ccel
erat
ion
Accel
erat
ion
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.
ORGANIZATION/FUNDING EVOLUTION
Steve Geer FNAL W&C 24 February, 2011 13
NFMCCNFMCC
+MCTF
InterimMAP
MAP
FY07 –FY09
Now(FY10/11)
≥FY11
~4 M$ ~9 M$ ~10 M$ ~15 M$ (requested)
First~10 years
PARTICIPATION
Steve Geer FNAL W&C 24 February, 2011 14
• 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.
Steve Geer FNAL W&C 24 February, 2011 16
Accelerator R&D Vladimir Shiltsev
Physics & Detector Studies Ron Lipton
To learn more, feel free to contact any of us.Also: http://map.fnal.gov/