Overview of the EMMA ProjectOverview of the EMMA Project
Rob EdgecockRob Edgecock
for the EMMA Collaboration*for the EMMA Collaboration*
*BNL, CERN, CI, FNAL, JAI, LPSC Grenoble, STFC, TRIUMF
OutlineOutline
• Motivation for EMMA
• How we got to where we are today
• Requirements
• EMMA lattices
• Accelerator
• Conclusions
EMMAEMMA
MotivationMotivation
• NS-FFAGs invented (Carol, Shane, Scott, etc): accel
EMMAEMMA
Neutrino Factory
• Advantages:
linear FF magnets: large DA, small aperture, HF RF
parabolic ToF: CW (asynchronous, serpentine, etc) accel
• Disadvantages:
novel longitudinal & transverse dynamics
rapid tune variations: multiple resonance crossings
• Recognised early on (~2004): must build one!
• Electron model was cheapest/only option EMMA
• Other possible applications also identified
Following Japanese scaling FFAGs
Helpful for funding
Model ParametersModel ParametersEMMAEMMA
• Electron model of muon FFAGs:parameters scaled muon electron
10-20MeV
few GHz RF
~40-50 cells (doublets, for cost), multiple of 6
• Needed:
Injector and hall – MP proposed DL & ERLP/ALICE
Funding: 2 possibilities identified in 2005 - FP6 NEST - BT fund BASROC/CONFORM
CONFORMCONFORM
• Created early 2006
• Submitted BT proposal in July 2006:total cost £8.2M – 80% from EPSRC
£5.6M for EMMA construction(+£250k from FP7)
• Started 1st April 2007
CONFORM
Project leader: Roger Barlow/Man Project manager: Neil Bliss/DL
PAMELA
Ken Peach/JAI
EMMA
Proj. leader: RE Proj. Manager: NB
Applications
Karen Kirkby/Surrey Bob Cywinski/Leeds
EMMA RequirementsEMMA RequirementsEMMAEMMA
• Demonstrate that non-scaling optics work
• Study resonances in detail:- emittance growth vs acceleration rate -
“ “ vs tune variation - “ “ vs parabola shape - effect of errors - detailed probe using injector
• Study longitudinal dynamics in detail:- transmission vs parameter values -
emittance growth vs parameter values - tof behaviour; effect of non-parabolic nature - effect of moving parabola - effect of errors
• Check effect of transverse dynamics
• Compare with predictions
• ……………..
EMMA LatticesEMMA LatticesEMMAEMMA
• 8 lattices (from Scott): determined machines specs
• Probe:- tune diagram- ToF- full transverse aperture – 3πmmrad
EMMA ParametersEMMA ParametersEMMAEMMA
• 10-20MeV electrons
• Full aperture injection and extraction at any energy
• Aperture probed with small emittance beam
• 42 doublet cells – di and quad B-fields ind variable
• RF: 1.3GHz - variable frequency, gain, phase
• Bunch charge – 16-32pC
• Cell lengths - total length: 394.481mm - long drift: 210.000mm - F: 58.782mm
- short drift: 50.000mm - D: 75.699mm
• Circumference – 16.57m
• Lots of diagnostics – must measure everything!
EMMA LayoutEMMA LayoutEMMAEMMA
• Layout almost complete
• Hardware design far advanced
• Many difficulties, esp. due to compactness
• Hard work of many, led by Neil
Two EMMA cells
DF
Cavity
210mm
Inside of ring
All elements parallel in one cell
ConclusionsConclusionsEMMAEMMA
• EMMA – proof of principle NS-FFAG
• Important for all future NS-FFAG projects
• Layout ~complete
• Hardware far advanced
• Lots learned for future NS-FFAG design & construction
• Good collaborative effort
• Beam autumn 09