This page lists all of the abstracts for the Fall 2015 colloquium series. For dates and speakers, see Colloquium.
"Hunting and Discovering the Higgs Boson (“God” particle) at the LHC of CERN", Friday, September 4, 12:00pm, MH 606
Yongsheng Gao, California State University, Fresno
"Resonant Coherent Excitation of Highly-Charged Ions in Crystals", Friday, September 25, 12:00pm, MH 606
Alena Ananyeva, GSI Helmholtz Centre for Heavy Ion Research
ABSTRACT: The resonant coherent excitation of ions in the fast oscillating electrical field, with frequencies in the x-ray range, created by the periodic Coulomb potential of a crystal target is a phenomenon which holds a large potential for spectroscopic investigations in relativistic highly-charged ions. If the field frequency matches the energy difference between two electronic states, a resonant excitation of the ion became possible. The onset of the process can be steered by tuning the ion velocity by fix target orientation or the relative orientation of the incoming ion velocity and the crystallographic orientation. If the crystal orientation simultaneously permits frequencies for two different electronic transitions, a sequential resonant excitation to higher states becomes possible.
This contribution presents a series of experiments performed at GSI (Darmstadt, Germany) and HIMAC (Tokyo, Japan) facilities with relativistic beams of heavy ions and thin Silicon crystal-targets. The occurrence of the ions excitation was detected by measuring the charge-state distribution of the ions after the interaction with the crystal and the yield of the x-rays emitted during the decay of the excited states as a function of the relative orientation of the target to the beam direction.
The performed measurements clearly demonstrate that sequential 1s->2p->3s/3d electron transition in H-like Ar was experimentally observed together with the alignment of the magnetic substates of the ions by the polarised crystal field. Resonant coherent excitation was also successfully applied for a precision measurement of a 1s22s->1s22p3/2 electron transition in Li-like U.
"Flowers from other gardens", Friday, October 9, 12:00pm, MH 606
Jim Williams, University of Western Australia
"Evolution of circumstellar disks and planet formation", Friday, October 16, 12:00pm, MH 606
Wladimir Lyra, California State University, Northridge
"Compact Atomic Magnetometer for Magnetic Anomaly Detection (MAD-CAM)", Friday, October 23, 12:00pm, MH 606
Michael Larsen, Northrop Grumman
ABSTRACT: The Northrop Grumman Advanced PNT Systems (APS) is currently developing a new Compact Atomic Magnetometer for Magnetic Anomaly Detection (MAD-CAM) with applications to anti-submarine warfare, global navigation, planetary field mapping, etc. The system utilizes magnetic resonance to form a three axis vector magnetometer which is simultaneously capable of producing high accuracy whole field scalar measurements. This compact and integrated dual function magnetometer eliminates the need for separate scalar and vector magnetometers and leverages the stable properties of the atomic species to form a highly accurate and repeatable sensor with low noise, low drift, high bandwidth, and wide dynamic range.
NSD has leveraged the technological advancements made in developing its Nuclear Magnetic Resonance Gyroscope (NMRG) as part of the DARPA funded Navigation Grade Integrated Micro Gyro (NGIMG) program and extended that work to magnetometer development with an Internal Research and Development (IRAD) 2009-2014, and Contract Research and Development (CRAD) funding from 2010-2015. The resulting magnetometer system, like the NMRG, will have a low Size, Weight, and Power (SWaP). This presentation will show the basic concept of operation and system design, as well as shielded and unshielded prototype performanc. Applications of the MAD-CAM sensor to geolocation and INS aiding will be discussed, and the potential position resolution and geolocation accuracy presented.