Muon Collider Design workshop, BNL, Upton NY December 3-7, 2007

1. MCDW Conclusions Y.Alexahin (FNAL) Muon Collider Design workshop, BNL, Upton NY December 3-7, 2007

2. What MC Parameters we can promise? Low Emit. High Emit. MCTF06 MCTF07 MCDW s (TeV) 1.5 Av. Luminosity (1034/cm2/s) 2.7 1 1 1.33-2  1 (x 2 IP) Av. Bending field (T) 10 6 8.33 6  12T dipoles Mean radius (m) 361.4 500 363.8 500  500 No. of IPs 4 2 2 2 Proton Driver Rep Rate (Hz) 65 13 60 40-60 up to 120* Beam-beam parameter/IP 0.052 0.087 0.1 0.1 * (cm) 0.5 1 3 1  1 Bunch length (cm) 0.5 1 2 1  1 No. bunches / beam 10 1 1 1 No. muons/bunch (1011) 1 20 12 11.3 10 Norm. Trans. Emit. (m) 2.1 25 13 12.3  25 Energy spread (%) 1 0.1 0.1 0.2 up to 0.2 Norm. long. Emit. (m) 0.35 0.07 0.14 0.14 up to 0.14 Total RF voltage (GV) at 800MHz 407103c 0.21 0.26103c 0.84 Muon survival N/N0 0.31 0.07 floss 0.2  0.1 + in collision / proton 0.047 0.01 0.15 0.03 8 GeV proton beam power 3.62 3.2 0.6/ floss 1.9-2.8 2* - 5** --------------------------------------------------------------------------- *) at 8GeV **) at 56 GeV MCTF Scenario - Y. Alexahin MCD workshop, BNL December 7, 2007

3. Critical Issues •  collider ring design satisfying ALL requirements: •  1cm • circumference  3km (luminosity ~ 1/R) • momentum acceptance  0.6 % • normalized transverse acceptance  200 mmmrad (with errors and beam-beam) • low momentum compaction 10-4 • protection of the vertex detector and tracker from seondaries • robustness: tolerances with technological possibilities (10-5?) •  high gradient vacuum RF in strong magnetic field •  proof that HPRF will work under ionizing beam •  incorporation of RF into HCC • - mini-workshop in spring? •  technologicalfeasibility of 50T solenoid •  complete design of 50T solenoid channel with matching and RF MCTF Scenario - Y. Alexahin MCD workshop, BNL December 7, 2007

4. FY08 MCTF Design & Simulations Plan Collider ring:  Optimization of the collider ring design  Study of implications of the “dipole first” option for detector protection  Beam-beam simulations  Detailing of the design with corrector circuits, injection and collimation systems Basic 6D ionization cooling:  “Guggenheim” RFOFO channel:  More realistic modeling of the magnetic field  Alternative design with open cell RF cavities with solenoids in the irises  Helical cooling channel  Design of RF structure which can fit inside the “slinky” helical solenoid  Design and simulation of the segmented channel  FOFO snake:  tracking simulations and optimization  Side-by-side comparison of the three structures with the aim of choosing the baseline scheme Final cooling:  Complete design of the 50T solenoid channel with required matching between the solenoids  Channel design incorporating Fernow’s lattice with zero magnetic field in RF  Feasibility study of the PIC/REMEX scheme MCTF Scenario - Y. Alexahin MCD workshop, BNL December 7, 2007

5. FY08 MCTF Design & Simulations Plan (continued) Driver:  Schemes based on the Project X linac  high reprate at 8GeV  with acceleration in MI to 30-60GeV  High-gradient induction linac Muon acceleration  RLA  Fast ramping synchrotron  FFAG for the initial stage Bunch coalescing  More realistic modeling of the bunch merging process at initial stages of 6D cooling  Alternative scheme with bunch coalescing at high energy (~30GeV). MCTF Scenario - Y. Alexahin MCD workshop, BNL December 7, 2007