Browsing by Author "Mann, M"
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- ItemAccelerator mass spectrometry on SIRIUS: new 6MV spectrometer at ANSTO(University of Jyväskylä, Finland, 2016-07-03) Wilcken, KM; Fink, D; Hotchkis, MAC; Garton, D; Button, D; Mann, M; Kitchen, RAs a part of Australian Federal Government funding in 2009 to establish a centre for accelerator science a new 6 MV state of the art accelerator – SIRIUS – was purchased. The system is now commissioned and comprises ion sources and beam lines to cater for a wide variety of both IBA and AMS applications. The ion source used for AMS (MC-SNICS) is the latest incarnation followed by 45 degree spherical ESA(R=0.3 m) and double focusing injection magnet (R=1 m, ME=20) prior the accelerator. At the terminal we have a choice of 2 stripper gasses and/or stripper foils. The high-energy spectrometer for AMS consists of a 1.27 m radius analyzing magnet with ME=176, 45 degree ESA (R=3.81m), followed by a switching magnet and 3 beam lines: one with a standard multianode ionization chamber; one with an absorber cell in front of the detector; whereas the third beam line has a time-of- ight detector. Details of the instrument design and performance data for 10Be, 26Al and 36Cl will be presented. © The Authors
- ItemAccelerator mass spectrometry on SIRIUS: new 6MV spectrometer at ANSTO(Elsevier, 2016-07-08) Wilcken, KM; Fink, D; Hotchkis, MAC; Garton, D; Button, D; Mann, M; Kitchen, RThe Centre for Accelerator Science at ANSTO operates four tandem accelerator systems for Accelerator Mass Spectrometry (AMS) and Ion Beam Analysis (IBA). The latest addition to the fleet is SIRIUS, a 6 MV combined IBA and AMS system. Following initial ion beam testing, conditioning and debugging software and hardware, SIRIUS is now commissioned. Details of the instrument design and performance data for 10Be, 26Al and 36Cl are presented.
- ItemANSTO's centre for accelerator science a progress update(Australian Nuclear Science and Technology Organisation, 2013-09-30) Garton, D; Evans, O; Downes, A; Mann, M; Mowbray, TIn 2009 the Australian Government announced that ANSTO would receive capital funding to develop a centre for accelerator science. • Provide assurance that ANSTO can meet it’s AMS and IBA commitments for the Australian research community. • Complements existing accelerator facilities at ANSTO and other accelerator labs in Australia.
- ItemLaser-heated microfurnace: gas analysis & graphite morphology(Cambridge University Press, 2009-06-04) Smith, AM; Yang, B; Hua, Q; Mann, Mpreparing ultra-small graphite samples from CO2 at the ~5 μg of carbon level (Smith et al. 2006, 2007, 2008). Recent effort has focused on automation using a LABview interface, which has permitted feedback control of the catalyst temperature as the reaction proceeds and logging of reaction parameters. Additionally, an automatic system has been developed to control the temperature of the cold finger for trapping CO2 (–196°C), trapping H2O (–80°C) and releasing these gases (25°C) during sample transfer and during the reaction. We have utilized a quadrupole mass spectrometer to study the gas composition during the reaction, in order to better understand the underlying chemical reactions for such small samples and to better estimate the overall efficiency of the process. Early results show that all CO2 is converted to CO by reduction on the iron catalyst within a few minutes of applying laser power. The reaction pressure stabilizes after ~20 minutes; however, some CO is not converted to graphite. The cold trap temperature of –80°C is effective at trapping H2O so there is little CH4 production. We have trialled a number of different iron catalysts (Cerac -325, Sigma Aldrich -400 and 25 nm Fe nanopowder) as well as Fe2O3 (reduced in situ to Fe) and have studied the graphite morphology by scanning electron microscopy (SEM). There is a marked difference in morphology with catalyst type; however, each graphite performs well in the cesium sputter ion source of the ANTARES AMS facility. These developments allow us to systematically optimize the performance of the apparatus and to develop a second generation device.
- ItemNegative ionisation efficiencies for 10Be, 26Al and Pu with MCSNICS at ANSTO(Australian Nuclear Science and Technology Organisation, 2021-11-17) Wilcken, KM; Child, DP; Hotchkis, MAC; Mann, M; Simon, KJ; Koll, D; Wallner, A; Hauser, T; Kitchen, RLow overall detection efficiency for actinides and cosmogenic isotopes (Al, Be) is the limiting factor affecting precision and sensitivity for applications where the amount of available sample material is small and/or rare isotope concentration is low. Due to low ionisation efficiencies for these isotopes it is not uncommon that more than 99% of the rare isotopes in the sample do not contribute to the statistical precision of the measurement. Optimising ion transmission and detection efficiency in the AMS measurement offers some room for improvement but these avenues are already close to their theoretical limits. On the other hand, optimising the performance and operation of the negative ion Cs-sputter sources has significant scope for improvement but is challenging. One often needs to compromise between competing requirements, for example, maintaining high sputtering rate to allow expedient consumption of the sample material but at the same time keeping the source insulators clean for longevity. The lack of a well-understood theoretical model for the negative ionisation process adds to the engineering challenges. Negative ionisation efficiencies above 30% have been demonstrated for radiocarbon [1] but remain often more than an order of magnitude lower for Be, Al and actinides. This is sometimes taken to be an inherent limitation of the technique, rather than a challenge to be addressed. Here we present details of the modified MC-SNICS sources at ANSTO, including engineering modifications that have improved longevity and stability. With attention to a combination of ion source running conditions, sample masses and sample binders the total efficiency for Pu measurements was increased up to 1.5%, corresponding to a negative ionisation yield of 4%. For Aland BeO- negative ion source yields are 0.2% and 3%, respectively.
- ItemThe new confocal heavy ion microprobe beamline at ANSTO: the first microprobe resolution tests and applications for elemental imaging and analysis(Elsevier B.V., 2017-08-01) Pastuovic, Z; Siegele, R; Cohen, DD; Mann, M; Ionescu, M; Button, D; Long, SThe Centre for Accelerator Science facility at ANSTO has been expanded with the new NEC 6MV “SIRIUS” accelerator system in 2015. In this paper we present a detailed description of the new nuclear microprobe–Confocal Heavy Ion Micro-Probe (CHIMP) together with results of the microprobe resolution testing and the elemental analysis performed on typical samples of mineral ore deposits and hyper-accumulating plants regularly measured at ANSTO. The CHIMP focusing and scanning systems are based on the OM-150 Oxford quadrupole triplet and the OM-26 separated scan-coil doublet configurations. A maximum ion rigidity of 38.9amu-MeV was determined for the following nuclear microprobe configuration: the distance from object aperture to collimating slits of 5890mm, the working distance of 165mm and the lens bore diameter of 11mm. The overall distance from the object to the image plane is 7138mm. The CHIMP beamline has been tested with the 3MeV H+ and 6MeV He2+ ion beams. The settings of the object and collimating apertures have been optimized using the WinTRAX simulation code for calculation of the optimum acceptance settings in order to obtain the highest possible ion current for beam spot sizes of 1μm and 5μm. For optimized aperture settings of the CHIMP the beam brightness was measured to be ∼0.9pAμm−2mrad−2 for 3MeV H+ ions, while the brightness of ∼0.4pAμm−2mrad−2 was measured for 6MeV He2+ ions. The smallest beam sizes were achieved using a microbeam with reduced particle rate of 1000Hz passing through the object slit apertures several micrometers wide. Under these conditions a spatial resolution of ∼0.6μm×1.5μm for 3MeV H+ and ∼1.8μm×1.8μm for 6MeV He2+ microbeams in horizontal (and vertical) dimension has been achieved. The beam sizes were verified using STIM imaging on 2000 and 1000mesh Cu electron microscope grids. © 2017 Elsevier B.V.
- ItemThe new external ion beam capability for testing of electronics suitable for harsh space radiation environments(Australian Institute of Nuclear Science and Engineering (AINSE), 2021-11-24) Peracchi, A; Cohen, DD; Pastuovic, Z; Paneras, N; Button, D; Hall, CJ; Davies, J; Mann, M; Cookson, DJ; Hotchkis, MAC; Brenner, CMIn 2019, the Australian Space Agency made its debut in the international scene of the space exploration. Securing the future of Australia’s space sector is the core of the Advancing Space: Australian Civil space Strategy 2019-2028. This Government plan reminds that space-based technology and services not only interests space missions, but benefits all Australians daily as for weather forecasting, GPS, internet access, online banking, emergency response tracking bushfires, monitoring of farming crops, etc. To further increase capability, the Space Infrastructure Fund (SIF) investment was issued to target 7 space infrastructure projects that involve several industries, organisations, universities, laboratories, all around the country. Mission control and tracking facilities, robotic & automation, AI command and control, space data analysis facilities, space manufacturing capabilities, and space payload qualification facilities, are the topics under study. ANSTO together with other 5 fund recipients engaged its resources in the last-mentioned project (space payload qualification facilities), with the aim to establish the National Space Qualification Network (NSQN). Particularly, the three ANSTO facilities Centre for Accelerator Science (CAS), the Australian Synchrotron and the Gamma Technology Research Irradiator (GATRI) will focus on enhancing and improving their capabilities for space radiation damage testing of electronics used in space and ensure they meet international standards in this area. Space technology can be affected by cosmic radiation when Single Event Upset (SEU) occurs, knocking out temporary or permanently the instrumentation that is paramount for the successful accomplishment of a mission, a test, or simply the usual functionality of a service. We need to deep understand the cause and the frequency of these events, in order to reduce the risk of component failure and to consequently optimizse the electronics. Tests must be performed in ground-based facilities before commercialization of any device. ANSTO facilities use accelerators to perform radiation tests with different beams (gamma-rays, x-rays, protons and heavy ions) to eventually provide international standards of Total Ionisation Dosage (TID) radiation testing for products that can enter faster into global supply chains. Because of the limitations encountered while performing tests in vacuum, at the CAS facility, the High Energy Heavy Ion Microprobe (HIM) of the 10MV ANTARES accelerator has recently been upgraded to an external chamber for testing standard electronic chips in an ambient-in-air environment. Advantages of an ex-vacuum microprobe are: ease of handling the sample with no limits to the dimension of the sample itself, no charge effects, more effective target heat dissipation, sampling is not required, gain in terms of time used for pump-up and down the chamber, and possibility to irradiate living system without compromising them. © The Authors
- ItemSIRIUS - a new 6MV accelerator system for IBA and AMS at ANSTO(Elsevier, 2016-03-15) Pastuovic, Z; Button, D; Cohen, DD; Fink, D; Garton, D; Hotchkis, MAC; Ionescu, M; Long, S; Levchenko, VA; Mann, M; Siegele, R; Smith, AM; Wilcken, KMThe Centre for Accelerator Science (CAS) facility at ANSTO has been expanded with a new 6 MV tandem accelerator system supplied by the National Electrostatic Corporation (NEC). The beamlines, end-stations and data acquisition software for the accelerator mass spectrometry (AMS) were custom built by NEC for rare isotope mass spectrometry, while the beamlines with end-stations for the ion beam analysis (IBA) are largely custom designed at ANSTO. An overview of the 6 MV system and its performance during testing and commissioning phase is given with emphasis on the IBA end-stations and their applications for materials modification and characterisation. © Elsevier B.V.