We propose using the storage ring method to measure the electric dipole moment (EDM) of D+, the bare deuteron nucleus, with a one sigma sensitivity of 10−29 e · cm per 107 s running time. At this level it will be the best experiment among current and currently planned EDM experiments. Its mass scale reach for SUSY-type new physics is more than 300 TeV, or if there is physics at the LHC scale, its sensitivity to CP-violating phases is 10−5 rad; both scales are much beyond the design sensitivity of the LHC. High intensity, polarized deuteron sources, polarimeters with high analyzing powers at 1 GeV/c total deuteron momentum, and the application of common accelerator techniques make this goal possible. The polarimeter systematic errors are minimized by applying symmetries related to the deuteron spin direction and the EDM signal. In addition, the slow beam extraction onto a solid carbon target aided by a precise beam position monitoring system ensures that the beam direction axis will remain the same within very tight limits during the storage time. The widening of the polarimeter detector capabilities to give counting as well as directional information will severely restrict the larger polarimeter systematic errors to well below the 10−29 e·cm level. We are perfecting those techniques by running very important hardware tests at KVI (the Netherlands) and COSY (Germany), where polarized deuteron beams are currently available.
The muon (g-2) experiment is described, and the recent results are presented. These results represent the final measurement for the positive muon.
The muon (g-2) experiment at Brookhaven National Laboratory has measured the anomalous magnetic moment of the positive muon with a precision of 0.7 ppm. This paper presents that result, concentrating on some of the important experimental issues that arise in extracting the anomalous precession frequency from the data.
A description is given of a new experiment to measure the muon electric dipole moment (EDM) to between sigma = 10(-24) e-cm and 10(-25) e-cm, which would be 5 to 6 orders of magnitude improvement over the current world average. Muons are stored in a magnetic ring. Precession due to Thomas precession and the magnetic moment are canceled with the proper combination of applied E and B fields. Only precession due to a non-vanishing EDM remains, resulting in a large amplification of the EDM signal. The method has general applicability to charged particles.
The design, construction, and operation of the electrostatic quadrupoles used in the muon (g−2) experiment E821 of BNL are described in detail. A new lead design allowed the construction of a very reliable system which could operate for hundreds of thousands pulses with no sparking. The new design also made possible the elimination of systematic errors associated with the E, B fields generated by the low energy trapped electrons present in Penning traps under medium vacuum conditions.
Electrostatic quadrupole focusing is to be used in the high precision measurement of the anomalous magnetic moment of the muon, AGS Experiment 821. The final design uses planar rather than hyperbolic electrodes, and the field is pulsed to minimize the effect of trapped electrons. The mechanical design is described. Performance in a 1.5 T magnetic field at less than 10-6 Torr is reviewed