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