Collab 6/20/05 #1 EDMEDM Martin Cooper, Los Alamos Co-spokesperson for the EDM Project for presentation to The EDM Collaboration Los Alamos, NM June 20, 2005 Collaboration Business

Collab 6/20/05 #2 EDMEDM Outline a)The Tribble committee b) R&D funds c)Chances for construction funds d)The SNS proposal e)R&D priorities

Collab 6/20/05 #3 EDMEDM The Tribble Committee - Text One of the most compelling opportunities in neutron science addresses why there is more matter than antimatter in the universe. We know that some kind of CP violation process is required to make this so. Although measurements with particles containing strange and bottom quarks have demonstrated that CP symmetry is violated by the weak interaction, the magnitude of the violation cannot account for the observed matter asymmetry. Perhaps CP is violated in the strong interaction among the light quarks or by the presence of new, but unobserved forces not contained in the standard model. A sensitive test of these possibilities is to look for a difference in the precession rate of a neutron

Collab 6/20/05 #4 EDMEDM The Tribble Committee - Text placed in a magnetic and electric field when the electric field is oriented “up” or “down.” The rate can be different only if the neutron has a significant electric dipole moment (EDM), that is, a CP-violating preferred arrangement of the quark charges inside the neutron. A new search for a neutron EDM at the SNS—in tandem with parallel searches involving neutral atoms, electrons, muons, and deuterium ions to be performed elsewhere— will be sensitive to this additional CP violation at levels needed to explain the matter excess. If no EDM is found in these experiments, then CP violation involving neutrinos, as mentioned earlier, might offer another avenue for explaining the origin of the matter excess.

Collab 6/20/05 #5 EDMEDM The Tribble Committee - Text A new U.S. neutron EDM collaboration has carried out a research and development program, including construction and prototyping of key components, all aimed at a 500-fold improvement in the measurement sensitivity compared with the present world average. The ingenious new experiment would use the new SNS ultra-cold beam line and feature a new method to trap, spin-polarize, and measure the neutrons. The collaboration has met several key technical milestones, opening a clear path to beginning construction of the experiment in 2007.

Collab 6/20/05 #6 EDMEDM The Tribble Committee - Findings Through a new Major Instrumentation Equipment (MIE) grant from DOE, nuclear science has a commitment to carry out future symmetry tests at the Spallation Neutron Source with the Fundamental Neutron Physics Beam Line.

Collab 6/20/05 #7 EDMEDM The Tribble Committee - Findings Nuclear physics initiatives in fundamental symmetry tests will open a window into physics beyond the standard model. These efforts test the very foundation of subatomic physics and must be pursued vigorously. New searches for the permanent electric dipole moments of the neutron and neutral atoms have outstanding discovery potential and will shed new light on the origin of the excess of matter over antimatter in the universe.

Collab 6/20/05 #8 EDMEDM R&D funds 1.DOE Office of Nuclear Physics had almost all of their R&D funds raided for some other Office of Science Project 2.Jehanne Simon-Gillo has no money left for FY'05 3.Gene Henry is working hard to scrape some FY'05 funds together to give it to give to EDM in July or August 4.If anything comes, it will not be available until beginning of FY'06 5.There has been no mention of FY'06 funding

Collab 6/20/05 #9 EDMEDM Chances for construction funds 1.A lot of emotional ups and downs 2.At MECO review, Jehanne told me that DOE was trying very hard for a FY'07 construction start 3.All rumors from the Tribble committee were that EDM had broad support from the community 4.Latest message from Jehanne said, "EDM will probably have to wait until announcement of the President's FY'07 budget," which is ~February 5.My opinion-No time to meet the CD0-3 requirements 6.At the NSAC meeting, Gene Henry told Bill Louis that EDM had the strongest support possible in their office, and they have not said no (a very good sign) 7.What will EDM's NSF collaborators submit in Sept.?

Collab 6/20/05 #10 EDMEDM The SNS proposal Due by the end of July, but my goal is July 10 Cover letter to FNPB PAC: 1.introducing the Pre-proposal 2.introducing the Update to the pre-proposal 3.describing the state of readiness of the experiment to be funded and to begin construction 4.requesting beneficial occupancy of the UCN guide hall one year prior to first beam for experiment assembly 5.requesting three years of UCN beam time

Collab 6/20/05 #11 EDMEDM R&D priorities Highest Priority 1. 3 He relaxation time from T = K at the proper concentration, including a SQUID NMR signal 2.Neutron storage time at ~4 K in a cell coated with deuterated polystyrene 3.Light collection design with the expectation of ~40 photoelectrons 4.Reliable superfluid valves Moderate priority 1.Dielectric strength of He measured for a pressurized superfluid 2.Surface HV breakdown of acrylic 3. 3 He evaporator 4. 3 He injector volume test 5.Beamline and measurement cell neutronics Monte Carlo Quite Useful 1.Magnet development 2.Kerr effect in the HV system 3.Atomic magnetometers 4.Laser induced flourescence