Harvey Gould's

Electron Electric Dipole Moment (e-EDM) Experiment Web Page

Contact: HAGould at LBL dot gov or through the LBNL directory.

MENU EDM Basics and New Physics eEDM Experiments Cs Fountain eEDM Experiment New Collaboration eEDM Experiment


What's New Four eEDM Experiments

old lab
new lab A proof-of-principle experiment was recently completed (Amini, Munger, & Gould 2007, link to journal) and my colleagues and I are now developing a full scale experiment.

Also leading up to the eEDM experiment is a series of Cs fountain experiments including: "Focusing a fountain of neutral cesium atoms with an electrostatic lens triplet" (Kalnins, Amini & Gould, 2005; link to journal),  "High precision measurement of the Static Dipole Polarizability of Cesium (Amini & Gould 2003, link to journal), and "Slowing and cooling molecules and neutral atoms by time-varying electric field gradients (Maddi [aka Amini], Dinneen &Gould 2000, link to journal) note: the conservative force only "cools" by a phase space rotation: there is no increase in phase space density as there is with laser cooling..

In 1987 Eugene Commins and I started a thermal atomic Tl beam experiment that, published in 1990 (Abdullah et al., 1990link to journal), set a new eEDM upper limit. I left the collaboration in 1992.

 I started my eEDM work on a cesium-sodium comparison atomic beam eEDM experiment when I joined Edgar Lipworth's group at Brandeis University as a very young second- year graduate student. Published in PRL ([Weisskopf et al., 1968; link to journal), it set a new limit to the eEDM. My second experiment was my thesis experiment: a PRL- published thallium-alkali comparison experiment (Gould, 1970; link to journal) that tied the Cs result.

Arriving at the Lawrence Radiation Laboratory in 1971, I did atomic collisions and QED experiments using few-electron heavy ions at the Super-HILAC (to Kr34+), the Bevalac (to U92+), and, in 1995, my last heavy ion experiment, at the Brookhaven AGS (Au 78+).
Old lab 2006: former HILAC cave - "natural" heating and cooling, tight fit. New lab. - great temperature control, lots of space before moving all our stuff in.
• Completed moving into new lab Feb. 2008. The lab is a low-noise low-background counting area where element 102 was discovered by Ghiorso, Sikkeland, Walton, and Seaborg (PRL. 1, 18 [1958]).

• The lab is shielded by building steel (cell phones do not work) and floor vibration is extremely low.

• Equipment for glass resistivity measurements has arrived and we are starting do do R & D for magnetic shielding and demagnetization to reach very low magnetic fields

• This web page was updated March. 15, 2008.