Magnetic dipole transition rates from measured lifetimes of levels of Be-like and B-like argon ions

Journals published by the American Physical Society can be found at http://publish.aps.org/The lifetimes of the 1s(2)2s2p P-3(2) level of Ar XV and 1s(2)2s(2)2p P-2(3/2) of Ar XIV have been measured using metastable Ar14+ and Ar13+ ions produced by an electron cyclotron resonance ion source, which were subsequently separately captured into a Kingdon ion trap. The lifetime results are tau(Ar XV, 2s2p P-3(2)) = 13.4(7) ms and tau(Ar XIV,2p P-2(3/2)) = 9.12(18) ms. Transition rates derived from the measured lifetimes differ significantly from both relativistic and nonrelativistic calculations of the 2s2p P-3(1)-P-3(2) M1 transition rate of Ar XV, but are in reasonable agreement with calculations for the 2p P-2(1/2)-P-2(3/2) M1 rate of Ar XIV. [S1050-2947(98)07108-X

Summary I - accelerator ion sources, fundamentals and diagnostics

The 11th International Symposium on the Production and Neutralization of Negative Ions and Beams was held in Santa Fe, New Mexico on September 12-15, 2006 and was hosted by Los Alamos National Laboratory. This summary covers the first three oral sessions of the symposium

Upgrade of the ATLAS 10 GHz ECRIS

A major renovation of the ATLAS 10 GHz ECRIS, which began operations in 1987, is in the planning and acquisition phase. The old two-stage source will be converted to a single stage design including a high gradient magnetic field, electron donor disk, large radial ports, and flexible modular design. Eight solenoid coils taken from the existing ECR will produce the axial mirror. The individual coils will be encased in an iron yoke that optimizes the magnetic field. Computer modeling of the field profile yields a minimum field along the axis of 3.0 kG with mirror ratios of 4.4 and 2.9. An open hexapole configuration consisting of Nd-Fe-B bars enclosed in an austenitic stainless steel housing will be placed in an aluminium plasma chamber that will be water cooled along the poles of the hexapole. The hexapole field at the chamber wall, 4 cm in radius, is expected to be 9.3 kG along the magnet poles and 5.7 kG along the center of the pole gaps, which are 2.4 cm wide. A 3D model produced from individual 2D field profiles was used to check the end effects of the hexapole. Based on the models this new field configuration is capable of supporting a second ECR resonance zone at 14 GHz, which may be implemented at a later date

Measured lifetimes of metastable levels of Mn X, Mn XI, Mn XII, and Mn XIII ions

Journals published by the American Physical Society can be found at http://publish.aps.org/An ion storage technique, based on the capture of metastable multiply charged ions from an external ion source into a Kingdon ion trap, has been used to measure the lifetimes of eight metastable levels of Mn ions with 3s(2)3p(k) configurations, k = 1 - 4. Although several lifetime calculations exist, some of the transition wavelengths have not been previously observed in any source. The lifetimes range from 1.5-35 ms. A measurement precision as good as 0.9% was obtained in favorable cases. The measured lifetimes are tau(Mn X, 3s(2)3p(4) S-1(0)) = 2.1 +/- 0.3, tau(Mn X, 3s(2)3p(4) D-1(2)) = 18.02 +/- 0.16, tau(Mn XI, 3s(2)3p(3) P-2(3/2)) = 3.0 +/- 0.2, tau(Mn XI, 3s(2)3p(3) P-2(1/2)) = 6.17 +/- 0.29, tau(Mn XI, 3s(2)3p(3) D-2(3/2)) = 35.1 +/- 1.43, tau(Mn XII. 3S(2)3p(2) S-1(0)) = 1.5 +/- 0.2, tau(Mn XII, 3s(2)3p(2) D-1(2)) = 11.16 +/- 0.10, and tau(Mn XII, 3s(2)3p P-2(3/2)) = 31.32 +/- 1.82 ms. These results are compared with the existing theoretical calculations, which have estimated uncertainties no better than 25%. [S1050-2947(99)102903-0]

Measurements and calculations of metastable level lifetimes in Fe X, Fe XI, Fe XII, Fe XIII, and Fe XIV

Journals published by the American Physical Society can be found at http://publish.aps.org/Lifetimes of metastable levels in the ground term of Fe ions within the 3s(2)3p(k), k=1-5, isoelectronic sequences have been measured. These measurements were performed utilizing ions that were selected by mass to charge ratio while transported from an electron cyclotron resonance ion source to a Kingdon ion trap, where they were captured and then confined for periods of up to 2.1 s. During this storage period, selected emission wavelengths of transitions from metastable levels in the visible or near-ultraviolet spectral regions were isolated using interference filters, and the time-dependent fluorescence intensities were measured using a photomultiplier tube. Measurement precisions on the order of 2% were achieved in favorable cases. The measured lifetimes are tau (Fe x, 3s(2)p(5) P-2(1/2)) = 13.64+/-0.25 ms, tau (Fe XI, 3s(2)3p(4 1)D(2)) = 9.86+/-0.22 ms, tau (Fe XII, 3s(2)3p(3) P-2(3/2)) = 1.85+/-0.24 ms, tau (Fe XII, 3s(2)3p(3) P-2(1/2)) = 4.38+/-0.42 ms, tau (Fe XII, 3s(2)3p(3) D-2(3/2)) = 20.35 +/-1.24 ms, tau (Fe XIII, 3s(2)3p(2) D-1(2)) = 6.93+/-0.18 ms, and tau (Fe XIV, 3s(2)3p P-2(3/2)) = 17.52+/-0.29 ms. These results are compared with existing and with new theoretical calculations, which have estimated uncertainties on the order of 10-25%

Ion source choices - an h- source for the high intensity neutrino source

The High Intensity Neutrino Source (HINS) program at Fermilab (formerly the Proton Driver) aims to develop a multi-mission linear accelerator (LINAC) capable of accelerate H{sup -} ions to 8 GeV. This paper touches on the ion source requirements for the HINS and discusses long pulse length testing of three ion sources which appear to have the capability of meeting these requirements

Long Term Suboxone™ Emotional Reactivity As Measured by Automatic Detection in Speech

Addictions to illicit drugs are among the nation’s most critical public health and societal problems. The current opioid prescription epidemic and the need for buprenorphine/naloxone (Suboxone®; SUBX) as an opioid maintenance substance, and its growing street diversion provided impetus to determine affective states (“true ground emotionality”) in long-term SUBX patients. Toward the goal of effective monitoring, we utilized emotion-detection in speech as a measure of “true” emotionality in 36 SUBX patients compared to 44 individuals from the general population (GP) and 33 members of Alcoholics Anonymous (AA). Other less objective studies have investigated emotional reactivity of heroin, methadone and opioid abstinent patients. These studies indicate that current opioid users have abnormal emotional experience, characterized by heightened response to unpleasant stimuli and blunted response to pleasant stimuli. However, this is the first study to our knowledge to evaluate “true ground” emotionality in long-term buprenorphine/naloxone combination (Suboxone™). We found in long-term SUBX patients a significantly flat affect (p<0.01), and they had less self-awareness of being happy, sad, and anxious compared to both the GP and AA groups. We caution definitive interpretation of these seemingly important results until we compare the emotional reactivity of an opioid abstinent control using automatic detection in speech. These findings encourage continued research strategies in SUBX patients to target the specific brain regions responsible for relapse prevention of opioid addiction.United States. Dept. of Defense. Assistant Secretary of Defense for Research & Engineering (Air Force Contract FA8721-05-C-0002