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

DECISION TREE

Steve Geer FNAL W&C 24 February, 2011 2

Pierre Oddone

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

ENERGY SPREAD

Steve Geer FNAL W&C 24 February, 2011 4

Beamstrahlung in any e+e- collider

E/E 2

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.

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MUON COLLIDER SCHEMATIC

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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).

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PROGRESS (continued)

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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

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NOWMC Design Feasibility Study

1

2

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Targ

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Dum

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Bunch

/ Pha

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Initia

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6D C

oolin

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Final

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Pre-A

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Accel

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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.

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http://conferences.fnal.gov/muon11/

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/