The slow control system of the FRS Ion Catcher State, A.N.; Beck, S.; Amanbayev, D. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2022, Letnik:
1034
Journal Article
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The FRS Ion Catcher setup at GSI is used for high precision measurements of slowed down exotic nuclei. The current setup consists of a gas-filled stopping cell, working at cryogenic temperatures for ...improved gas purity, coupled to a radio-frequency quadrupole beamline for bunching and pre-selection and a multiple-reflection time-of-flight mass spectrometer for precise mass measurements. The setup with all its components is controlled by various control systems. The development of a new slow control system for monitoring, control, and logging of all components of this setup is presented. The slow control is based on the LabVIEW Actor Framework enhanced by the Control System++ libraries, a highly scalable and extendable platform which is a powerful tool to create complex messaging schemes from custom events. The implementation and testing of the control system at the FRS Ion Catcher setup is discussed.
We report mass measurements of neutron-rich Ga isotopes 80–85Ga with TRIUMF's Ion Trap for Atomic and Nuclear science. The measurements determine the masses of 80–83Ga in good agreement with previous ...measurements. Here, the masses of 84Ga and 85Ga were measured for the first time. Uncertainties between 25 and 48 keV were reached. The new mass values reduce the nuclear uncertainties associated with the production of A ≈ 84 isotopes by the r-process for astrophysical conditions that might be consistent with a binary neutron star (BNS) merger producing a blue kilonova. Our nucleosynthesis simulations confirm that BNS merger may contribute to the first abundance peak under moderate neutron-rich conditions with electron fractions Ye = 0.35–0.38.
This work describes a novel continuous flow reactor concept for organic synthesis using heterogeneous catalysts. The concept is based on static mixers coated with a catalytic metal layer, which can ...be inserted into standard stainless steel reactor tubing. The static mixers were prepared by 3D metal printing, allowing for maximum design flexibility and thus can be tailored to a large number of chemical synthesis applications. The nickel or platinum catalysts were deposited either by metal cold spraying or electrodeposition, which allows for potential scale up and mass production and these techniques are compatible with a range of different catalytic metals. The catalytic flow reactor was evaluated for a series of continuous flow hydrogenations of alkenes and carbonyls.
PURPOSE: The purpose of this study was to evaluate the quality of the medical evidence available to the clinician in the practice of hematology/oncology.
METHODS: We selected 14 neoplastic ...hematologic disorders and identified 154 clinically important patient management decision/interventions, ranging from initial treatment decisions to those made for the treatment of recurrent or refractory disease. We also performed a search of the scientific literature for the years 1966 through 1996 to identify all randomized controlled trials in hematology/oncology.
RESULTS: We identified 783 randomized controlled trials (level 1 evidence) pertaining to 37 (24%) of the decision/interventions. An additional 32 (21%) of the decision/interventions were supported by evidence from single arm prospective studies (level 2 evidence). However, only retrospective or anecdotal evidence (level 3 evidence) was available to support 55% of the identified decision/interventions. In a retrospective review of the decision/interventions made in the management of 255 consecutive patients, 78% of the initial decision/interventions in the management of newly diagnosed hematologic/oncologic disorders could have been based on level 1 evidence. However, more than half (52%) of all the decision/interventions made in the management of these 255 patients were supported only by level 2 or 3 evidence.
CONCLUSIONS: We conclude that level 1 evidence to support the development of practice guidelines is available primarily for initial decision/interventions of newly diagnosed diseases. Level 1 evidence to develop guidelines for the management of relapsed or refractory malignant diseases is currently lacking.
For the first time, the FRagment Separator (FRS) and the Multiple-Reflection Time-Of-Flight Mass-Spectrometer (MR-TOF-MS) particle identification (PID) systems at GSI have been coupled. This new ...approach adds to the standard FRS PID an additional unambiguous identification of the fragments and the possibility to identify and count long-lived isomeric states (>ms). For this purpose, single-event timestamp information given by a common clock was used to correlate both systems. Two methods were implemented to improve the signal-to-background ratio by more than a factor 2 in the high resolution mass spectrum obtained with the MR-TOF-MS for the 109In isotope. Moreover, the coupling of the systems allows an improvement in the on-line monitoring of the FRS-Ion Catcher (IC) efficiency and extraction time. In addition, range calculations were implemented in the on-line monitoring; a powerful tool for real-time optimization of stopped beam experiments.
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