1. Electric dipole moments (EDM) experiments Making progress in
9 February 2015
EP-Seminar, CERN
The status of EDM experiments and the Storage Ring Proton EDM Yannis Semertzidis, CAPP/IBS at KAIST
Electric dipole moments (EDM) experiments
Making progress in
Electron,
Neutron, &
Storage ring Proton EDM experiments

2. Y. Semertzidis, CAPP/IBS, KAIST
South Korea: New Institute with emphasis in basic science, $0.5B/year
Y. Semertzidis, CAPP/IBS, KAIST

3. IBS/CAPP: Center for Axion and Precision Physics research
Strong CP-Problem
Axion dark matter search:
State of the art axion dark matter experiment in Korea
Collaborate with ADMX, CAST…
Proton Electric Dipole Moment Experiment
Storage ring proton EDM
Muon g-2, mu2e, etc.
Y. Semertzidis, CAPP/IBS, KAIST

4. Y. Semertzidis, CAPP/IBS, KAIST
CAPP Group
Several more Research Fellows signed up already…
Y. Semertzidis, CAPP/IBS, KAIST

5. Physics at the Frontier, pursuing two approaches:
Energy Frontier
(LHC,…)
Precision Frontier
(gμ-2, mw, B, EDM, ν,…)
which are complementary and inter-connected. The next SM will emerge with input from both approaches.

6. Physics reach of magic pEDM (Marciano)
Sensitivity to new contact interactions: 1000 TeV
Sensitivity to SUSY-type new Physics:
The proton EDM at 10-29e∙cm has a reach of >300TeV or, if new physics exists at the LHC scale, < rad CP-violating phase; an unprecedented sensitivity level.
The deuteron EDM sensitivity is similar. 6

7. Matter-antimatter asymmetry points to BSM CP-violation
We see:
From the SM:
Y. Semertzidis, CAPP/IBS, KAIST

8. Cosmological inventory
Y. Semertzidis, CAPP/IBS, KAIST

9. Y. Semertzidis, CAPP/IBS, KAIST
Purcell and Ramsey: “The question of the possible existence of an electric dipole moment of a nucleus or of an elementary particle…becomes a purely experimental matter”
Phys. Rev. 78 (1950)
Y. Semertzidis, CAPP/IBS, KAIST

10. Short History of EDM
1950’s neutron EDM experiment (Ramsey & Parcel), looking for parity violation
After P-violation was discovered it was realized EDMs require both P & T-violation
1960’s EDM searches in atomic systems
1970’s Indirect Storage Ring EDM method from the CERN muon g-2 exp.
1980’s Theory studies on systems (molecules) w/ large enhancement factors
1990’s First exp. attempts w/ molecules. Dedicated Storage Ring EDM method developed
2000’s Proposal for sensitive Deuteron EDM exp.
2010’s Proposal for sensitive Proton EDM exp.

11. Important Stages in an EDM Experiment
Polarize: state preparation, intensity of beams
Interact with an E-field: the higher the better
Analyze: high efficiency analyzer
Scientific Interpretation of Result! Easier for the simpler systems
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL. ICHEP02, 31 July 2002

12. EDM methods
Neutrons: Ultra Cold Neutrons, apply large E-field and a small B-field. Probe frequency shift with E-field flip
Atomic & Molecular Systems: Probe 1st order Stark effect
Storage Ring EDM for charged particles: Utilize large E-field-Spin precesses out of storage plane (spin vector analysis)

13. Y. Semertzidis, CAPP/IBS, KAIST
EDM method Advances
Neutrons: advances in stray B-field effect reduction
Atomic & Molecular Systems: high effective E-field
Storage Ring EDM for D, P: High intensity polarized sources well developed; spin precession techniques in SR well understood
Y. Semertzidis, CAPP/IBS, KAIST

14. Y. Semertzidis, CAPP/IBS, KAIST
EDM method Weaknesses
Neutrons: Intensity; High sensitivity to stray B-fields: uniformity and gradients; Motional B-fields and geometrical phases
Atomic & Molecular Systems: Low intensity of desired states; in some systems: physics interpretation
Storage Ring EDM: some systematic errors different from g-2 experiment, large structure
Y. Semertzidis, CAPP/IBS, KAIST

15. An electron in an atom…
Schiff Theorem: A Charged Particle at Equilibrium Feels no Force… …An Electron in a Neutral Atom Feels no Force Either:
…Otherwise it Would be Accelerated…(Note: Schiff actually said something else…)

16. Measuring an EDM of Neutral Particles
H = -(d E+ μ B) ● I/I d E B
mI = 1/2 ω2 ω1
mI = -1/2
d = e cm
E = 100 kV/cm
w = 10-4 rad/s 

17. Neutron EDM experimental limits vs. year

18. Y. Semertzidis, CAPP/IBS, KAIST
Clayton, SNS
Y. Semertzidis, CAPP/IBS, KAIST

19. Y. Semertzidis, CAPP/IBS, KAIST
Clayton, SNS
Y. Semertzidis, CAPP/IBS, KAIST

20. Applying spin dressing techniques to equalize and further reduce
the stray B-field sensitivity

21. Y. Semertzidis, CAPP/IBS, KAIST
Clayton, SNS
Y. Semertzidis, CAPP/IBS, KAIST

22. Y. Semertzidis, CAPP/IBS, KAIST
Clayton, SNS (Lepton Moments, 2014)
Y. Semertzidis, CAPP/IBS, KAIST

23. Schedule Feb 2007 Conceptual Design Approved
2009 Technical Feasibility, Preliminary Engineering, Cost and Schedule Baseline Approved
Aug DOE CD 2/3a Approval
Jan Beneficial Occupancy of FnPB UCN Building
Oct nEDM Project Completed
First Published few ´ e•cm
2020 nEDM Experiment Completed and Published @ few ´ e•cm

24. PSI nEDM, P. Schmidt, Lepton Moments, 2014
The UCN source delivers sufficient statistics for data taking, potential improvements are being identified
The nEDM experiment is taking data, operational reliability has been improved during shutdown 2014
As a test of magnetic field control we have measured the most precise gyromagnetic ratio of mercury-199 and neutron.
We expect with 300 data-days until 2016 a statistical sensitivity of σ ≲10-26 e⋅cm

25. How about an electron in an atom…
Schiff Theorem: A Charged Particle at Equilibrium Feels no Force… …An Electron in a Neutral Atom Feels no Force Either:
…Otherwise it Would be Accelerated…(Note: Schiff actually said something else…)

26. Schiff Theorem: A Charged Particle at Equilibrium Feels no Force… …An electron in a neutral atom feels no force either. However, the average interaction energy is not zero because the EDM in the lab frame is velocity dependent
E. Commins et al., Am. J. Phys. 75 (6) 2007

27. The apparatus and parameter values
B=22 mG
V=±10 KV, E=~2 MV/m (height of cell ~1cm)
SCT = 102 s
Y. Semertzidis, CAPP/IBS, KAIST

28. Y. Semertzidis, CAPP/IBS, KAIST
The data
The drift in frequency is taken out by taking the frequency difference between the cells.
Runs with micro-sparking are taken out.
Y. Semertzidis, CAPP/IBS, KAIST

29. The results and best limits
It now dominates the limits on many parameters
They expect another improvement factor ~3 - 5.

30. History of 199Hg EDM results
Lamoreaux
Jacobs
Klipstein
Fortson
Griffith
Swallows
Romalis
Loftus
Fortson
Now we will move on to EDM searches (T violation) in which atomic experiments are way out there in a claswsw of their own in what they have to tell us about particle physics.
Current
sensitivity
1987
1993
1995
2001
2009
2014
Y. Semertzidis, CAPP/IBS, KAIST

31. ThO EDM: The ACME team Paul Hess Brendon O’Leary Ben Spaun Cris Panda
Jacob
Baron
Nick
Hutzler
Elizabeth
Petrik
Adam
West
Ivan Kozyryev
Max
Parsons
Emil
Kirilov
Get new pic with Emil
Add photos of all PbO team
Amar
Vutha
Wes
Campbell
Yulia Gurevich
John Doyle
Gerald Gabrielse
DPD

32. Amplifying the electric field E with a polar molecule
Eext
Th+
Small energy splittings in molecules
enable polarization P ~ 100%
(Eext ~ 1 V/cm enough for ThO)
Eeff O–
Inside molecule, eEDM acted on by Eeff ~ P 2Z 3e/a02 due to relativistic motion
P. Sandars
1965
D. DeMille, LM 2014
Eeff  80 GV/cm for ThO*
Meyer & Bohn (2008); Skripnikov, Petrov & Titov (2013); Fleig & Nayak (2014)
104(26) 84(13) 75(2)
Requires unpaired electron spin(s)

33. Systematic Error Budget
de x10-30 e-cm
Statistical error: 37
D. DeMille, LM 2014
Systematic shifts applied only from effects observed to move EDM channel
Applied shift small compared to uncertainties

34. Many upgrades planned for ACME signal size
Electrostatic focusing of molecular beam: ~20x (***)
Stimulated vs. spontaneous state prep: ~8x (***)
Thermochemical beam source ~10-50x (**)
New fluorescence collection & detectors ~4-10x (*)
Cycling fluorescence ~3-10x (*)
Longer integration time ~10-100x
(***) = fully characterized in auxiliary tests
(**) = partially characterized (*) = preliminary observations and/or theory estimates
Focusing simulation
STIRAP data?
Thermochemical beam source data?
D. DeMille, LM 2014
>300x gain in N appears feasible ultimately

35. Adam Ritz, LM 2014

36. Adam Ritz, LM 2014

37. Adam Ritz, LM 2014

38. Adam Ritz, LM 2014

39. Storage Ring Proton EDM
Y. Semertzidis, CAPP/IBS, KAIST

40. Storage Ring Electric Dipole Moment Experiment for the Proton
Revolution in statistics: 1E11 pol. Protons per 1000 s
Strong endorsement from P5 under all funding cond.
Discussion with DOE-HEP office to plan a successful experiment
An experiment to probe proton EDM to 10-29ecm
Most sensitive, flavor-conserving CP-violation
Complementary to LHC and the neutron EDM; probes New Physics ~1E3 TeV
Based on “g-2” experience using the magic momentum technique with electric fields

41. The storage ring Proton
Major characteristics of a successful Electric Dipole Moment Experiment
Statistical power:
High intensity beams
Long beam lifetime
Long Spin Coherence Time
An indirect way to cancel B-field effect
A way to cancel geometric-phase effects
Control detector systematic errors
The storage ring Proton
EDM method has it all!

42. Feasibility of an all-electric ring
First all-electric ring (AGS-analog) proposed/built It worked!
Two encouraging technical reviews performed at BNL: Dec. 2009, March 2011.
Fermilab comprehensive review: Fall Val Lebedev considers the concept to be sound.
Cost (2011, 2012 engineering cost): $70M + tunnel.

43. Proton storage ring EDM experiment is combination of beam + a trap

44. Stored beam: The radial E-field force is balanced by the centrifugal force.
Yannis Semertzidis, BNL 44

45. The proton EDM uses an ALL-ELECTRIC ring: spin is aligned with the momentum vector
at the magic momentum E
Momentum
vector
Spin vector
Yannis Semertzidis, BNL 45

46. Feasibility of an all-electric ring
Two technical reviews have been performed at BNL: Dec 2009, March 2011
Fermilab thorough review. Val Lebedev considers the concept to be sound.
First all-electric ring:
AGS-analog
Ring radius 4.7m
Proposed-built
It worked!
Y. Semertzidis, CAPP/IBS, KAIST

47. The proton EDM ring evaluation Val Lebedev (Fermilab)
Beam intensity 1011 protons limited by IBS
, kV

48. The proton EDM ring Total circumference: 500 m
Straight sections are instrumented
with quads, BPMs, polarimeters,
injection points, etc, as needed.

49. pEDM polarimeter principle (placed in a straight section in the ring): probing the proton spin components as a function of storage time
Micro-Megas detector, MRPC or Si.
“defining aperture”
polarimeter target
Extraction: lowering the vertical focusing
carries EDM signal
increases slowly with time
carries in-plane (g-2) precession signal

50. International srEDM Network Common R&D
srEDM Coll. pEDM
Proposal to DOE HEP, NP
SQUID-based BPMs
B-field shielding/compensation
Precision simulation
Systematic error studies
E-field tests …
JEDI (COSY/Jülich)
Pre-cursor EDM exp.
Polarimeter tests
Spin Coherence Time tests
Precision simulation
Cooling
E-field tests …

51. What has been accomplished?
Polarimeter systematic errors (with beams at KVI, and stored beams at COSY).
Precision beam/spin dynamics tracking.
Stable lattice, IBS lifetime: 104 s.
Spin coherence time 103 s; role of sextupoles understood (using stored beams at COSY).
Feasibility of required electric field strength MV/m, 3cm plate separation (JLab, FNAL)
Analytic estimation of electric fringe fields and precision beam/spin dynamics tracking. Stable!
(Paper already published or in progress.)

52. Work of Md. A. Mamun and E. Forman
J-Lab E-field work: TiN-coated Aluminum
No measureable field emission at 225 kV for gaps > 40 mm, happy at high gradient
Bare Al
TiN-coated Al
the hard coating covers defects
Work of Md. A. Mamun and E. Forman

53. Any radial magnetic field sensed by the
Clock-wise (CW) & Counter-Clock-wise Storage
Any radial magnetic field sensed by the
stored particles will also cause their
vertical splitting. Unique feature among EDM experiments…
Equivalent to p-bar p colliders in
Magnetic rings
Y. Semertzidis, CAPP/IBS, KAIST 53

54. Distortion of the closed orbit due to Nth-harmonic of radial B-field
Clockwise beam
Y(ϑ)
The N=0 component
is a first order effect!
Counter-clockwise
beam
Y. Semertzidis, CAPP/IBS, KAIST
Time [s]

55. SQUID gradiometers at KRISS

56. SQUID gradiometers at KRISS
Y. Semertzidis, CAPP/IBS, KAIST

57. Y. Semertzidis, CAPP/IBS, KAIST

58. B-field Shielding Requirements
No need for shielding: In principle, with counter-rotating beams.
However: BPMs are located only in straight sections  sampling finite. The B-field needs to be less than (10-100nT) everywhere to reduce its effect. We are building a prototype (Selcuk Haciomeroglu, CAPP).
Y. Semertzidis, CAPP/IBS, KAIST

59. Peter Fierlinger, Garching/Munich
Y. Semertzidis, CAPP/IBS, KAIST

60. Technically driven pEDM timeline13 14 15 16 17 18 19 20 21 22
Two years system development
One year final ring design
Three years beam-line construction and installation
Y. Semertzidis, CAPP/IBS, KAIST

61. What makes the pEDM experiment
Magic momentum (MM): high intensity charged beam in an all-electric storage ring
High analyzing power: A>50% at the MM
Weak vertical focusing in an all-electric ring: SCT allows for 103s beneficial storage; prospects for much longer SCT with mixing (cooling and heating)
The beam vertical position tells the average radial B-field; the main systematic error source
Geometrical-phase specs: 0.1mm plate alignment.
Y. Semertzidis, CAPP/IBS, KAIST

62. The Proton EDM experiment status
Support for the proton EDM:
CAPP/IBS, KAIST in Korea, R&D support for SQUID-based BPMs, Prototype polarimeter, Spin Coherence Time (SCT) simulations.
COSY/Germany, studies with stored, polarized beams, pre-cursor experiment.
After the P5 endorsement DOE-HEP requested a white paper to establish the proton EDM experimental plan.
Large ring radius is favored: Lower E-field strength required, Long SCT, nT B-field tolerance in ring. Use of existing ring preferred.

63. Physics strength comparison (Marciano)
System
Current limit [ecm]
Future goal
Neutron equivalent
Neutron
<1.6×10-26
~10-28
10-28
199Hg atom
<3×10-29
129Xe atom
<6×10-27 ~
Deuteron nucleus
~10-29
3× ×10-31
Proton nucleus
<7×10-25
10-29
Y. Semertzidis, CAPP/IBS, KAIST 63

64. Statistics limited Sensitivity to Rule on Several New Models
Baryogenises
Electroweak
GUT SUSY
Gray: Neutron
Red: Electron
If found it could explain
Baryogenesis
(p, d, n (or 3He))
n current
e current
n target
p, d target
e target
Upgrade?
Statistics limited
Electron EDM new physics reach: 1-3 TeV
Much higher physics reach
than LHC; complementary
e-cm
J.M.Pendlebury and E.A. Hinds, NIMA 440 (2000) 471

65. Summary
EDM experiments are making steady progress in the electron and neutron EDM sensitivity.
The storage ring proton EDM has been developed. The breakthrough? Statistics! Best sensitivity hadronic EDM method.
pEDM first goal ecm with a final goal ecm. Complementary to LHC; probes New Physics ~103 TeV.

66. Y. Semertzidis, CAPP/IBS, KAIST
Extra slides
Y. Semertzidis, CAPP/IBS, KAIST

67. srEDM International Collaboration
COSY:
Strong collaboration with Jülich/Germany continues
We’ve been doing Polarimeter Development, Spin Coherence Time benchmarking, Syst. Errors, Beam/Spin dynamics simulation, etc. for >5 years w/ stored pol. beams.
JLAB: breakthrough work on large E-Fields
KOREA:
We are forming the EDM group and getting started with system developments.
ITALY (Ferrara, Frascati,…)
TURKEY (ITU,…)
GREECE (Demokritos, …)
Three PhDs already: KVI, Ferrara, ITU
Y. Semertzidis, CAPP/IBS, KAIST

68. The JEDI experiment status
Helmholtz Foundation evaluation, early 2014.
The pre-cursor experimental program is approved: Use of the existing COSY ring, slightly modified to become sensitive to deuteron EDM (RF-Wien filter).
EDM sensitivity moderate, but significant as first direct measurement.
Asked to prepare a CDR for a sensitive storage ring EDM experiment.
Y. Semertzidis, CAPP/IBS, KAIST

69. Y. Semertzidis, CAPP/IBS, KAIST

70. Y. Semertzidis, CAPP/IBS, KAIST
Why now?
Exciting progress in electron EDM using molecules.
Several neutron EDM experiments under development to improve their sensitivity level.
Proton EDM could be decisive to clarify the picture.
Y. Semertzidis, CAPP/IBS, KAIST

71. Storage ring proton EDM method
All-electric storage ring. Strong radial E-field to confine protons with “magic” momentum. The spin vector is aligned to momentum horizontally.
High intensity, polarized proton beams are injected Clockwise and Counter-clockwise with positive and negative helicities. Great for systematics
Great statistics: up to ~1011 particles with primary proton beams and small phase-space parameters.
Y. Semertzidis, CAPP/IBS, KAIST

72. Large Scale Electrodes, New: pEDM electrodes with HPWR
Parameter
Tevatron pbar-p Separators
BNL K-pi Separators
pEDM
Length
2.6m
4.5m 3m
Gap
5cm
10cm
3cm
Height
0.2m
0.4m
Number 24 2
102
Max. HV
180KV
200KV
150KV

73. The grand issues in the proton EDM experiment
BPM magnetometers (need to demonstrate in a storage ring environment)
Polarimeter development: high efficiency, small systematic errors
Spin Coherence Time (SCT): study at COSY/simulations; Simulations for an all-electric ring: SCT and systematic error studies
Electric field development for large surface area plates
Y. Semertzidis, CAPP/IBS, KAIST

74. 1. Beam Position Monitors
Technology of choice: Low Tc SQUIDS, signal at Hz (10% vertical tune modulation)
R&D sequence:
Operate SQUIDS in a magnetically shielded area-reproduce current state of art
Operate in RHIC at an IP (evaluate noise in an accelerator environment);
Operate in E-field string test
Y. Semertzidis, CAPP/IBS, KAIST

75. 2. Polarimeter Development
Polarimeter tests with runs at KVI & COSY demonstrated < 1ppm level systematic errors: N. Brantjes et al., NIM A 664, 49, (2012)
Technologies under investigation:
Micro-Megas/Greece: high rate, pointing capabilities, part of R&D for ATLAS upgrade
MRPC/Italy: high energy resolution, high rate capability, part of ALICE development
Y. Semertzidis, CAPP/IBS, KAIST

76. 3. Spin Coherence Time: need >102 s
Not all particles have same deviation from magic momentum, or same horizontal and vertical divergence (all second order effects)
They cause a spread in the g-2 frequencies:
Present design parameters allow for 103 s. Cooling/mixing during storage could prolong SCT (upgrade option?).
Y. Semertzidis, CAPP/IBS, KAIST

77. The miracles that make the pEDM
Magic momentum (MM): high intensity charged beam in an all-electric storage ring
High analyzing power: A>50% at the MM
Weak vertical focusing in an all-electric ring: SCT allows for 103s beneficial storage; prospects for much longer SCT with mixing (cooling and heating)
The beam vertical position tells the average radial B-field; the main systematic error source
Y. Semertzidis, CAPP/IBS, KAIST

78. Y. Semertzidis, CAPP/IBS, KAIST
Hadronic EDMs ~
Order of magnitude estimation of the neutron EDM:
M. Pospelov,
A. Ritz, Ann. Phys.
318 (2005) 119.
From dimensional analysis
Why so small? Axions? CAST, ADMX,…
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL. ICHEP02, 31 July 2002

79. Y. Semertzidis, CAPP/IBS, KAIST
Quark EM and Color EDMs
i.e. Deuterons and neutrons are sensitive
to different linear combination of quarks
and chromo-EDMs…
The Deuteron is ~20 times more sensitive…
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL. ICHEP02, 31 July 2002 79

80. If nEDM is discovered at 10-28 ecm level?
The deuteron EDM is complementary to
neutron and in fact has better sensitivity.
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL 80

81. Physics Motivation of dEDM
Sensitivity to new contact interaction: 3000 TeV
Sensitivity to SUSY-type new Physics:
The Deuteron EDM at 10-29e∙cm has a reach of ~300TeV or, if new physics exists at the LHC scale, 10-5 rad CP-violating phase. Both are much beyond the design sensitivity of LHC.
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL 81

82. Deuteron EDM High sensitivity to non-SM CP-violation
Negligible SM background
Physics beyond the SM (e.g. SUSY) expect CP-violation within reach
Complementary and better than nEDM
If observed it will provide a new, large source of CP-violation that could explain the Baryon Asymmetry of our Universe (BAU)
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL 82

83. Overview of EDM experiments
EDMs with spins: First rate physics
It will not be done at LHC. Its physics is complementary and many times better than the LHC reach.
The next decade promises to be very exciting
The experiments are very challenging and lots of fun
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL. ICHEP02, 31 July 2002

84. Y. Semertzidis, CAPP/IBS, KAIST
Tests at COSY ring at Juelich/Germany
Goals: Construct prototype dEDM polarimeter. Install
in COSY ring for commissioning, calibration, and testing for sensitivity to EDM polarization signal and systematic errors.
Current location
behind present EDDA
detector.
Y. Semertzidis, CAPP/IBS, KAIST

85. Y. Semertzidis, CAPP/IBS, KAIST3
Y. Semertzidis, CAPP/IBS, KAIST

86. Y. Semertzidis, CAPP/IBS, KAIST
Systematic errors
The systematic error is ~60% of the statistical error
Y. Semertzidis, CAPP/IBS, KAIST

87. The Permanent EDM of the Neutron
A permanent EDM d
The current value is < 3 x e•cm (90% C.L.)
Hope to obtain roughly < 2 x e•cm with UCN in superfluid He + -
s = 1/2
d•E
Y. Semertzidis, CAPP/IBS, KAIST

88. Y. Semertzidis, CAPP/IBS, KAIST
Deformed nuclei
225Ra at Argonne National Lab, Roy Holt et al.
225Ra (starting tests with Ba) at KVI (The Netherlands): K. Jungmann, L. Willmann…
Y. Semertzidis, CAPP/IBS, KAIST

89. Bounds on CP Violating Parameters
d(199Hg) = (0.49 ± 1.29stat ± 0.76sys ) x e cm
| d(199Hg) | < 3.1 x e cm (95% CL)
Confidence Levels: 199Hg (95%), 205TI (90%), TIF (95%)
Quark Chromo EDMs
Proton EDM
Semi-Leptonic Interactions:
QCD Phase
Neutron EDM
Electron EDM
Y. Semertzidis, CAPP/IBS, KAIST

90. Summary Our 2009 Result led to a New Limit on the EDM of 199Hg
| d(199Hg) | < 3.1 x e cm (95% CL)
Factor of 7 Reduction in Previous Upper Limit
Improved Bounds on CP Violating Parameters
Expect Factor of 5 improvement in Experimental Sensitivity
Expect to begin data collection later this year
Upgrading the Current Apparatus
Among his many accomplishments, Norman Ramsey founded the research field of EDM measurements and developed many of the techniques needed to do such precise measurements. He will always be an inspiration to us.

91. A forecast: electron EDM
e-edm, 10-32
2009
Cornell
Gould
Hinds, 10-29
Heinzen
Molecules
Shafer-Ray, 10-28
DeMille, few x 10-30
Weiss, 4 x 10-30
Atoms
2007
DeMille, fewer x 10-28
Hinds, few x 10-28
2006
Present bound:
Tl, x 10-27
Solid state
Lamoreaux
Liu
Hunter

92. Next generation: neutron and deuteron
2009
SNS
Talk by
Kirch
n, room T
PSI, 10-27
Talks by Peng,
Karamath
ILL; few x 10-28
n, cryo
2006
Present bound:
n, 3 x 10-26
Deuteron ?
Talks by Onderwater, Orlov

93. Y. Semertzidis, CAPP/IBS, KAIST
Noise level: 0.9 fT/√Hz
Vertical tune modulation frequency: 10 kHz
Y. Semertzidis, CAPP/IBS, KAIST

94. Peter Fierlinger, Garching/Munich
Issues: demagnetization,
effect of holes, etc.
Y. Semertzidis, CAPP/IBS, KAIST

95. Polarimeter design, rates:
Beam rates ~102 Hz/cm2 on average, higher at small radius. Design: ~1KHz/pad.
Store bunches with positive/negative helicity for pol. syst. errors.
70 cm

96. The EDM signal: early to late change
Comparing the (left-right)/(left+right) counts vs. time we monitor the vertical component of spin
M.C. data
(L-R)/(L+R) vs. Time [s]
Opposite helicity bunches
result to opposite sign slopes
Y. Semertzidis, CAPP/IBS, KAIST

97. Large polarimeter analyzing power at Pmagic!
Y. Semertzidis, CAPP/IBS, KAIST
Yannis Semertzidis, BNL

98. Data: From the June 2008 run at COSY
Y. Semertzidis, CAPP/IBS, KAIST

99. Y. Semertzidis, CAPP/IBS, KAIST
Our proton EDM plan
Develop the following systems (funded by IBS/Korea, COSY/Germany, applying for NSF support, and DOE-HEP/NP):
SQUID-based BPM prototype, includes B-field shielding (UMass, CAPP/Korea, BNL,…)
Polarimeter development (Ind. Univ., CAPP, COSY,…)
Electric field prototype (Old Dom. Un. (NSF), JLab,…)
Study of systematic errors (BNL, FNAL, Cornell,…)
Precision beam and spin dynamics simulation (BNL, CAPP, Cornell, COSY,…)
Lattice optimization, beam diagnostics (MSU (NSF),…)
Y. Semertzidis, CAPP/IBS, KAIST