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MCDW Conclusions. Y.Alexahin (FNAL). Muon Collider Design workshop, BNL, Upton NY December 3-7, 2007. What MC Parameters we can promise?. Low Emit. High Emit. MCTF06 MCTF07 MCDW  s (TeV) 1.5 Av. Luminosity (10 34 /cm 2 /s) 2.7 1 1 1.33-2  1 (x 2 IP)

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slide1

MCDW Conclusions

Y.Alexahin

(FNAL)

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

slide2

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

slide3

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

slide4

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

slide5

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