Search for an intrinsic electric dipole moment EDM on the deuteron

1
Search for an intrinsic electric dipole moment
(EDM) on the deuteron
EDM aligns with spin
Standard Model predictions typically lt 10-30
ecm. (beyond the reach of proposed
experiments) Any non-zero observation is a
signature of new physics.
Avishai PRD 32, 314 gets enhanced value for
deuteron (5.4 x 10-30 ecm).
Present limits
Precision methods use neutral particles polarized
particles E parallel to B changes in precession
frequency when sign of E changes
fundamental electron (in Tl atom) lt 1.6 x
10-27 ecm muon lt 10-18 ecm QCD
physics neutron lt 6.3 x 10-26 ecm Nuclear
physics 199Hg atom lt 2.1 x 10-28 ecm
LOI submitted to J-PARC (phase II)
Dmitriev and Senkov PRL 91, 212303 say
effective limit on neutron is lt 4 x 10-25 ecm
Future plans
neutron (Peng seminar) co-rotation with 3He
in 4He bath goal 10-27 ecm cost 11M
equipment with 9M LANL infrastructure
must improve polarization hold time tests
2004 run 2008-10
Radium searches (Holt_at_ANL, KVI) octupole
deformation enhances coupling goal 10-28
ecm (effective for n lt 5 x 10-28 ecm)
run 2006-08
Spokespersons Jim Miller, BU Yannis Semertzidis,
BNL
new method for deuteron (muon) storage of
charged particle in ring, precess in radial
E field track spin with polarimetry goal
10-27 ecm cost ?
Connection to T-odd strength in chiral
limit explored by Khriplovich NPA 665, 365.
2
g-2
EDM
anomalous precession ?a ?s - ?c
add radial E field to cancel this term (almost)
momentum
spin
EDM will generate small vertical component that
grows with time
with
For ring radius 20 m energy 120
MeV d 10-27 ecm
?a 4.8 x 10-7 rad/s
choose µ momentum to cancel this term use
electrostatic focusing know B precisely! extract
a from ?a
dC polarimeter eff. 0.25, ?iT11? 0.5
Injecting 7 x 109 /bunch, sufficient
statistics for 20 s flattop come in about one
week.
3
Deuteron EDM planning status
IUCF contribution
What are required tolerances and systematic
error issues? How might errors be managed?
deuteron polarimetry, design, error analysis
Managing tensor polarization systematic errors
requires that we allow deuterons to precess (?a ?
0) and measure precession curves. The EDM signal
must have right phase and period correct
reversal with spin-flip from various
sources CW and CCW operation sign of
?a size that varies as 1/?a
Physical setup mechanical tolerances,
monitoring maximizing E-field, effects of
currents reducing vertical E-field (CW vs. CCW)
Ring imperfections depolarization (RF
effects) rotation non-commutativity test
beams (proton)?
Polarimetry high efficiency, analyzing power
error management (t21, etc.)
Near term polarimeter projects Planning designs
and analyses dC data for polarimeter design
(100-200 MeV) most likely from KVI prototype
tests, most likely at COSY ring
compatibility, sensitivity tests
What is needed to meet requirements? What ring
size best balances benefit/cost?
4
Minimal IUCF personnel EJS 1 student or
post-doc
NOTE The Dutch government has awarded a 5-year
young investigator grant to Gerco Onderwater
for EDM polarimeter development. Gerco started
at the KVI in December.
optimistic timetable
2004
2005
2006
initial planning visit to KVI and COSY
proposal preparation
obtain dC data set
setup
running
multidetector array that could be built at IUCF
analysis
proposal to COSY
prototype polarimeter test at COSY
design, fabrication
running
analysis
new NPE proposal
need to know ring energy
5
Red equipment at IUCF
IUCF EDM ring (draft)
Blue new equipment
atomic beam proton/deuteron polarized ion source
Ring Properties E 2.5 MV/m B 1.6 kG
T(d) 116 MeV p 0.67 GeV/c ß
0.34 ? 1.06 ring radius 20 m
dipole radius 14.2 m
injection dipoles and quads
RFQ 3 MeV
3 spin precession solenoids 3.9 T-m
linac 11 MeV
polarimeter (4)
20 m
Polarized deuterons 5 108
/bunch Intensity improvements higher energy
x 7 (intensity ? T3/2) larger circumference
x 2 multiple bunches x 5, if
polarization lifetime long and DAQ OK
RF cavity
strip-inject accumulator and synchrotron
6
detailed
Estimated Costs k
rough estimate
Re-establish IUCF injector polarized ion
source 120 injector ring 463
injection 126 stacking 159 868
Detail dipoles 1200 supplies
220 switchgear 62 trim coils
72 quads 240 supplies
250 steerers 80 corrections
80
LINAC sections 2000
EDM ring magnets 2164 vacuum 444
RF cavity 153 standard diagnostics 460
3221
Building 6000
Manpower (design) 6300
should have overhead crane, shielding, HVAC,
power substation, DAQ/control area, utilities,
service rooms, setup rooms
Contingency (25) 4600
TOTAL 23 M
Not included electrostatics
special EDM gear
7
optimistic timetable
2004
2005
2006
2007
initial planning visit to KVI and COSY
proposal preparation
obtain dC data set
setup
running
multidetector array that could be built at IUCF
analysis
proposal to COSY
prototype polarimeter test at COSY
design, fabrication
running
analysis
new NPE proposal
need to know ring energy
further design considerations
proposal preparation
proposal consideration
funding?
additional personnel machine physics?