# Presentation: 901594

## MUON COLLIDER ZDR: ACCELERATOR SIMULATIONS & DESIGN

- R.C. Fernow
- Brookhaven National Laboratory

## OVERVIEW & TIMELINE

- 2008-2010
- study proposed alternatives for accelerator subsystems
- simulate subsystem performance using defensible parameters
- cross-check promising subsystems with ≥2 codes
- 2011
- specify _baseline_ accelerator design
- optimize baseline, minimize work on alternatives
- simulate representative matching sections
- carry out representative tolerance studies
- 2012
- _freeze_ accelerator design
- complete design of all matching sections
- do end-to-end simulation of accelerator systems
- do detailed tolerance studies
- do necessary simulations for the ZDR

## CURRENT 1.5 TeV SCENARIOS

|  | LEMC | MEMC | HEMC |
| --- | --- | --- | --- |
| Avg Luminosity  (1034/cm2/s) | 2.7 | 1.33-2 | 1 |
| Avg bending field  (T) | 10 | 6 | 6 |
| Proton driver rep rate  (Hz) | 65 | 40-60 | 13 |
| β*  (cm) | 0.5 | 1 | 1 |
| Muons per bunch  (1011) | 1 | 11.3 | 20 |
| Muon bunch train in collider | 10 | 1 | 1 |
| Norm. Transv. Emittance  (μm) | 2.1 | 12.3 | 25 |
| Norm. Long. Emitiance  (m) | 0.35 | 0.14 | 0.07 |
| Energy spread  (%) | 1 | 0.2 | 0.1 |
| Muon survival (%) | 31 | 20 | 7 |

-  currently there is no consensus on the best way to do this

## PROTON DRIVER TASKS

- assume independent baseline Project X study
- our effort addresses upgrades to meet μ collider specs
- proton bunch structure rings
- power upgrade to ~4 MW
- study operating the linac in cw mode
- develop conceptual designs
- evaluate instabilities
- do tracking studies with realistic errors

## TARGET TASKS

- simulations
- benchmark MERIT results
- refine MHD modeling of beam/jet/field interactions
- refine nozzle simulations
- study Hg jet splash issues for Hg collection pool
-  facility design
- Hg loop system
- upstream & downstream beam windows
- robotics for target replacement/repairs
- design of tungsten/water inner shielding
- study use of HTS conductor in target solenoid

## FRONT END TASKS

- study & optimize the major FE subsystems
- decay, bunching & phase rotation
- precooling
- 6D cooling
- final cooling
- design other needed auxiliary subsystems
- charge separation & recombination
- bunch merging
- do end-to-end simulations
- try to understand breakdown in RF cavities
- design suitable normal conducting cavities

## MUON ACCELERATOR TASKS

- need complete design for low energy acceleration (120 MeV to ~25 GeV)
- study suitability of NF accelerator design
- need complete designs for high energy acceleration (~25 to 750 GeV)
- recirculating linear accelerator (RLA)
- fast ramping synchrotron
- other alternatives (FFAGs, reinject in PD linac)
- do single particle tracking simulations thru entire chain
- study collective effects
- impedance driven
- parasitic collisions
- two stream instabilities

## COLLIDER RING TASKS

- need basic lattice designs
- IR design with appropriate constraints on quad gradients & radii
- chromatic correction schemes (special regions vs. local)
- arc cells (FODO vs. achromats)
- need complete design of matching regions
- design chromaticity & nonlinear detuning correction circuits
- simulate dynamic aperture
- simulate secondary particle fluxes
- iterate IR designs with Physics & Detector Group
- design RF system
- design BPM & closed orbit correction circuits
- detailed studies of coherent effects

## DELIVERABLES

- optimized designs for all important subsystems of a MC
- end-to-end simulations of machine performance
- estimates of uncertainties in performance & machine parameters
- technical basis for a 1st MC cost estimate
- detailed specifications for machine components
- list of unresolved R&D issues
- ZDR chapters on machine design and performance

## COST BREAKDOWN

-  needed effort estimated from Task Lists and/or similar design studies
-  new FTEs include ~2 engineers and a mix of scientists & postdocs
-  M&S is for travel

|  | FY08 | FY09 | FY10 | FY11 | FY12 |
| --- | --- | --- | --- | --- | --- |
| Current FTE | 7.9 | 8 | 8 | 8 | 8 |
| New FTE |  | 9 | 16 | 24 | 26 |
| SWF (K$) | 1815 | 3580 | 4960 | 6660 | 7160 |
| M&S (K$) |  | 120 | 130 | 140 | 150 |
| Total (K$) | 1815 | 3700 | 5090 | 6800 | 7310 |

## LEVEL OF INVOLVEMENT

- we assume that all current effort on machine design (~8 FTE) will continue thru 2012
- FNAL, BNL, ANL, LBNL, ORNL, JLAB
- UC Riverside, Mississippi, Princeton, UCLA
- Muons Inc, Particle Beam Lasers Inc
- the major new cost in this plan is for incremental effort to complete the ZDR by 2012
- additional people from our present institutions
- collaborating with new institutions
- new hires

## SUMMARY OF PLAN

- we will study proposed options for MC subsystems
- proton driver upgrades, target, front end, μ accelerator, collider ring
- we will combine the best options into a baseline design
- we will optimize the baseline and fill in missing parts
- engineering input to ensure realism
- we will do end-to-end simulation of the baseline design
- we will document the results in the ZDR