+

-

Concluding remarks on the R&Dfor a Magic Proton Ring for 10-29ecm.

Yannis K. Semertzidis, BNL

•The bottom line

•Funding request

•Possible action

EDM-review meetingBNL, 7 & 8 December 2009

Need support to develop (fully loaded costs) Total: ~$4M

• SCT COSY-INF.:$1M, UAL+SPINK: $0.5M

• BPMs $0.45M + hardware: ~$1M (likely)

• Polarimeter $1M

• E-field gradient: $0.6M

Possible Immediate Action Plan

• SCT COSY-INFINITY: $1M. Need a post doc and a graduate student. Collaboration with COSY/Juelich? UAL+SPINK: $0.5M C-AD based, part of RHIC spin effort?

• BPMs: $0.45M + hardware (need to establish team with experts including a team-leader)

• Polarimeter: $1M (IUCF based effort?)• E-field: $0.6M. BNL Physics dept. based effort.

• $0.5M for would be needed to keep the momentum in FY10

From Frank Rathmann’s talk at the collaboration meeting (fully backed by H. Stroeher)

• 26 Electrostatic separators with support systems (we need 64)

• Use testing chambers with New Plates

• High Pressure Water Rinsing

• …

Establish an agreement with FNAL: They can help with E-field & we’ll help with muon g-2

3 m

BPM Prior work (ATF of KEK/Japan)

PRST , Accel & Beams, 11,062801 (2008).Achieved res. ~8nm per ~1010 electrons/bunch

Not exactly the same application... NSLS II work (@ BNL) may be more applicable

More work preparing for DOE reviews:

• Source-beam preparation, Beamline, Injection (C-AD)• Bunch capture with RF (develop RF) (C-AD)• Vertical to horizontal spin precession (RF-solenoid)

(COSY)• Detailed studies of IBS, beam-beam interactions,

optimize phase space (C-AD)• Slow extraction onto an internal target for polarization

monitoring (stripline kickers) (COSY)• Use feedback to RF from polarimeter to keep spin

longitudinal (IUCF/C-AD)• Costing of experiment (plus building) (C-AD)

Technically driven Milestones

0807 09 10 11 12 13 14 15 16 17

Spring 2008, Proposal to the BNL PAC• 2010-2013 R&D phase; ring design

• Fall 2010: E vs. gap studies; simulation and design of Fall 2010: E vs. gap studies; simulation and design of polarimeter; 1polarimeter; 1stst phase of SCT studies; design of BPM cavity phase of SCT studies; design of BPM cavity

• Fall 2011: Polarimeter construction; SCT including placement Fall 2011: Polarimeter construction; SCT including placement errors & fringe fields; BPM cavity construction and electronics errors & fringe fields; BPM cavity construction and electronics development, test in lab.development, test in lab.

• Spring 2012: Finish first full scale E-field module testSpring 2012: Finish first full scale E-field module test• Fall 2012: Finish commissioning and calibration of polarimeter Fall 2012: Finish commissioning and calibration of polarimeter

detector at COSY; Full scale tracking simulation package for detector at COSY; Full scale tracking simulation package for EDM ring in place; Test cavity BPMs at a collision point using EDM ring in place; Test cavity BPMs at a collision point using stored beamsstored beams

Technically driven pEDM Timeline

0807 09 10 11 12 13 14 15 16 17 Spring 2008, Proposal to the BNL PAC• 2008-2012 R&D phase; ring design• Fall 2009 Conceptual Technical Review at BNLFall 2009 Conceptual Technical Review at BNL

• Fall 2012, Finish R&D studies: a) Develop BPMs, 10 nm, 1 Hz BW resolution

b) spin/beam dynamics related systematic errors. c) Polarimeter detector development and prepare for testing

d) Finalize E-field strength to use e) Establish Spin Coherence Time, study systematic errors,

optimize lattice

• FY 2013, start ring construction• FY 2015, pEDM engineering run starts• FY 2016, pEDM physics run starts

Technically driven pEDM Timeline

0807 09 10 11 12 13 14 15 16 17

• June 2010 CD-0• June 2011 CD-1• Fall 2012 CD-2/3Fall 2012 CD-2/3• Fall 2015 CD-4

• Start of 2012, finish pEDM detailed ring design

• FY 2013, start ring construction• FY 2015, pEDM engineering run starts• FY 2016, pEDM physics run starts

Summary: Total R&D $4M, 3 years • We need a very strong endorsement to move forward.• $0.5M/FY10 not to lose a year• Need to establish a Beam Position Monitoring team

and to support the Spin & Beam Dynamics team. Sufficiently support the E-field and Polarimeter teams.

• Facilitate collaboration with experts around the world (NSLS II, ILC-based BPM work like ATF-KEK, etc.).

• Help with travel expenses until funding materializes to collaborating institutions

• Collaborating with COSY/Juelich and FNAL would be mutually beneficial.

12

AGS Complex

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CF100

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AP1

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B1C1

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B5I601

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100 m

pEDM @ 17 MV/m

pED

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ing

30.8m

A possible solution for simultaneous CW and CCW beams (Yuri Orlov)

Beta-Max Beta-MaxBeta-Min Beta-Min

Vector asymmetry

V+

V−

T+

T−

Unp

Resonance crossing using RF-solenoid (full spin flip)

Slowly extracting the beam while monitoring its polarization as a function of time

From the September 2008 run at COSYPolarimeter team

Searching for optimum sextupoles (Preliminary res.)

Two sets of sextupoles are next to focusing and defocusing quads. Both horizontal and vertical motions are included.

SCT team, F. Lin et al.

SCTS

A possible magic proton ring lattice: ~240m circumference.

Proton Statistical Error (230MeV):

3pd

R c Tot pE AP N fT

p : 103s Polarization Lifetime (Spin Coherence Time)A : 0.6 Left/right asymmetry observed by the polarimeterP : 0.8 Beam polarizationNc : 21010p/cycle Total number of stored particles per cycleTTot: 107s Total running time per yearf : 0.5% Useful event rate fraction (efficiency for EDM)ER : 17 MV/m Radial electric field strength (65% azim. cov.)

292.5 10 e cm/yearpd