Rolland Johnson, Muons, Inc. A Muon Collider CDR? Rolland Johnson, Muons, Inc. Some Personal History of CDR Experience Whether a CDR is possible depends on the goals: The CERN SppbarS had a luminosity goal of 1030 at 540 GeV COM Discovered W, Z, etc. John Adams ~”Needed to keep accelerator team together until LEP…” The Tevatron Collider had a luminosity goal of 1030 at 1600 GeV COM Discovered Top Quark, etc. Achieved more than 3x1032 (both projects overestimated the pbar production cross-section by ~2X) LHC… Rol -7/27/2012 NuFact 2012

Technology Inventions m Muons, Inc. Technology Inventions Stochastic cooling (van der Meer) CERN/ISR/-PO/72-31 Proof of principle experiment 1977 (Thorndahl et al.) Nobel Prizes for Rubbia and van der Meer 1984 Comments TX, EWS Rol -7/27/2012 NuFact 2012

From a 2009 talk by Carlo Rubbia Rol -7/27/2012 NuFact 2012

From a 2009 talk by Carlo Rubbia Rol -7/27/2012 NuFact 2012

From a 2009 talk by Carlo Rubbia Rol -7/27/2012 NuFact 2012

From a 2009 talk by Carlo Rubbia Rol -7/27/2012 NuFact 2012

From a 2009 talk by Carlo Rubbia Rol -7/27/2012 NuFact 2012

High-Energy High-Luminosity Muon Colliders Muons, Inc. High-Energy High-Luminosity Muon Colliders precision lepton machines at the energy frontier possible with new inventions and new technology achievable in physics-motivated stages Project-X (led to my enthusiasm for ADS) stopping muon beams (e.g. mu2e conversion experiment) neutrino factory Higgs factory Z’ factory (lower luminosity, perhaps LHC inspired) Energy-frontier muon collider Rol -7/27/2012 NuFact 2012

m Muons, Inc. Muon Colliders: Back to the Livingston Plot A lepton collider at the energy frontier! 5 TeV m+m- Modified Livingston Plot taken from: W. K. H. Panofsky and M. Breidenbach, Rev. Mod. Phys. 71, s121-s132 (1999) Rol -7/27/2012 NuFact 2012

Muon Collider Emittances and Luminosities Muons, Inc. Muon Collider Emittances and Luminosities After: Precooling Basic HCC 6D Parametric-resonance IC Reverse Emittance Exchange εN tr εN long. 20,000 µm 10,000 µm 200 µm 100 µm 25 µm 100 µm 2 µm 2 cm At 2.5 TeV on 2.5 TeV 20 Hz Operation: Rol -7/27/2012 NuFact 2012

New Inventions/Developments Muons, Inc. New Inventions/Developments New Ionization Cooling Techniques Emittance exchange with continuous absorber for longitudinal cooling Helical Cooling Channel (HCC) Derbenev Momentum-dependent Helical Cooling Channel 6D Precooling device, muon stopping beam (mu2e) Yonehara 6D cooling demonstration experiment (MANX) Cummings Ionization cooling using a parametric resonance (PIC) Derbenev Methods to manipulate phase space partitions Reverse emittance exchange using absorbers (REMEX) Derbenev Bunch coalescing (NF and MC can share injector) (mucoal) Bhat Technology for better cooling Pressurized RF cavities (HPRF) Johnson Helical Solenoid (HS) Kashikhin Higher Fields (HTS) Zlobin, Schwartz Simulation programs (G4BL) Roberts BNL inventions/extensions to earlier work Palmer Big Helix (Gugenheim) Cooling channel ideas (super Fernow) Low energy emittance exchange in high B (HTS) Rol -7/27/2012 NuFact 2012

The First Muon Collider CDR? Muons, Inc. The First Muon Collider CDR? From a talk I gave at EPAC08 - “In about 4 years, the LHC and Tevatron will tell us the desired energy of the next lepton collider. At that time we must understand the needed technology and be ready to design, cost, and build the appropriate muon collider.” An s-channel resonance Higgs factory that provides adequate luminosity using 6-d beam cooling to get small momentum spread answers important questions for HEP is on the path to an energy-frontier muon collider rides the tide of LHC publicity Rol -7/27/2012 NuFact 2012

m Muons, Inc. Rol -7/27/2012 NuFact 2012

m R is the rms energy spread of the beams Muons, Inc. R is the rms energy spread of the beams To match the Higgs width the, beam spread should be 4MeV/126GeV= 0.003% ~100 pB = 10-34 cm2 L=1032 0.01 Higgs/s Rol -7/27/2012 NuFact 2012

Emittance Evolution Plot Possibly REmEx in a PIC-type channel PIC is a possible high leverage technique for final 6D Cooling Muons, Inc. The figure is courtesy of K. Yonehara Rol -7/27/2012 NuFact 2012

Higgs Factory Emittances and Luminosities Muons, Inc. Higgs Factory Emittances and Luminosities After: Precooling Basic HCC 6D Parametric-resonance IC No REMEX εN tr εN long. 20,000 µm 10,000 µm 200 µm 100 µm 25 µm 100 µm At 63 GeV on 63 GeV, these and other optimistic parameters imply about 105 Higgs/year. (Spreadsheet available) Can that be a goal of a Higgs MC CDR? Rol -7/27/2012 NuFact 2012

Higgs Factory Enabling Technology m Muons, Inc. Higgs Factory Enabling Technology A project is underway (Muons, Inc. and Fermilab) to design a 1-m long Helical Cooling Channel Segment – complete with A 10 T Superconducting Helical Solenoid magnet, Twenty 805 MHz RF Cavities, each - dielectric-loaded - pressurized with doped hydrogen gas, and powered by a - phase and frequency locked magnetron power source This may be the needed proof of principle technology demonstration. Rol -7/27/2012 NuFact 2012

m Muons, Inc. Higgs Factory CDR If we now focus on a Higgs factory, we should come up with some clever ways to take advantage of the large cross section of the s-channel resonance to do some good physics on the way to an energy frontier muon collider! Rol -7/27/2012 NuFact 2012