BECOLA is full commissioned with beta-asymmetry and beta NMR techniques along with bunched beam photon detection.
Andrew Klose successfully defended his Ph.D. dissertation on May 29. Andrew has received a National Research Council Postdoctoral Fellowship, and will begin work in July at the National Institute of Standards and Technology in Boulder, CO. Andrew will be collaborating with Dr. Chris Oates on a research task within the Optical Frequency Combs and Applications project, led by Dr. Scott Diddams.
Michael Hammen from the University of Mainz will be a visiting scientist at NSCL starting January 28, 2013 for 10 weeks to work on the High Intensity Cooler and Buncher associated with the BECOLA facility. Michael is receiving support from the Helmholtz Graduate School for Hadron and Ion Research abroad program.
Off-line laser spectroscopy of neutral iron has been performed. An iron beam was produced via electron impact ionization of ferrocene vapor. The ion beam was passed through a sodium vapor in the charge-exchange cell, and 371 nm light was used to excite Fe I. A representative spectrum is shown in the figure below. This marks the first time that the BECOLA team has produced an ion beam of interest using the so-called Metal Ions from Volatile Organic Compounds (MIVOC) technique, which was developed at JYFL .
Commissioning tests of the BECOLA facility is progressing. We have observed the 6S5/2 <--> 6P7/2 hyperfine spectrum of stable 55Mn-I at 403.19 nm via laser induced fluorescence. All possible transitions were observed in a single HV scan applied to the CEC. The Mn+ beam was produced in a filament (plasma) ion source. The BECOLA team will continue to explore stable beam spectroscopy for transition elements for comming radioactive beam experiments.
Commissioning tests of the BECOLA facility have been progressing nicely. Recently, the we have observed the 4s 2S1/2 <-> 4p 2P1/2 (D1) hyperfine spectrum of stable 39K via laser induced fluorescence. A typical D1 spectrum from the commissioning tests is shown below The 39K measurement was the first time that potassium was produced using the BECOLA offline ion source, and the measurement successfully completed the commissioning of the red/infrared photon detection system. This progress is a major step forward toward realizing online measurements. The BECOLA team has a PAC 36-approved experiment to study electromagnetic moments of neutron deficient isotopes 35,36K.
The first resonance curve was observed at the BECOLA facility this month! We will continue to commission the beamline by characterizing the D1 calcium(I) line. Soon, the photon detection system for red wavelengths (700-900nm) will be complete and it will be possible to study potassium ions.
Offline production and transport of stable calcium has begun, the charge exchange cell has been loaded operated with sodium, and the photon detection system has been installed. We will observe our first resonance from calcium ions soon!
Progress on commissioning of the BECOLA facility.
Beam line construction is progressing well. Laser light passed through the beam line for the first time, and offline testing will begin in one month.
The BECOLA Beam Line.
The BECOLA group traveled to the University of Mainz in July 2010 to test the charge exchange cell (CEC). The CEC was compared to the Mainz version (LAZ). In contrast to the CEC which has a vertical configuration, the LAZ has a horizontal configuration with alkali heating in the center and two condensing regions on either end. Many parameters were compared including leakage rate, neutralization efficiency, and asymmetry of resonance signals.
The Mainz and MSU collaboration.