Universität zu Köln

Stolz, A., Dewald, A., Heinze, S., Altenkirch, R., Hackenberg, G., Herb, S., Mueller-Gatermann, C., Schiffer, M., Zitzer, G., Wotte, A., Rethemeyer, J. and Dunai, T. (2019). Improvements in the measurement of small (CO2)-C-14 samples at CologneAMS. Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms, 439. S. 70 - 76. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1872-9584

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Abstract

Since 2015, the CologneAMS started operating a second SO-110 B ion source (Arnold et al., 2010; Klein and Mous, 2017) from High Voltage Engineering Europe (HVE) with a gas injection system (GIS) from Ionplus AG (Wacker et al., 2013) for the measurement of gaseous CO2 samples. Significant effort was spent increasing the efficiency of C- ion beam extraction as well as the operational reliability. Details are described in Stolz et al. (2017). Recent work was aimed at prolonging the cleaning intervals and allowing unattended routine (CO2)-C-14 measurements. Problems related to sparking inside the source chamber could be eliminated by electrically shielding the ceramic linear actuator that is used to move the target pieces into the source head. Furthermore, the Cs reservoir temperature was decreased from 135 degrees C to 120 degrees C. The negative ion formation efficiency has dropped only slightly to about 5% with the current settings. Additionally, the GIS sample magazine capacity was doubled to 16 ampules, which enables longer measurements without user interaction. A dedicated software (Gas Injection Control Software, GICS) was developed that controls GIS and AMS hardware for fully autonomous measurements, including the source and accelerator startup, sample cracking or combustion, sample mixing with the He carrier gas and the transfer to the source, as well as the subsequent data analysis. This tool also comprises error detection routines in order to minimize the risk of losing a sample due to hardware failures. The blank value was reduced from typically 7.10(-15) to similar to 3.10(-15). This was achieved by modifications in the cleaning and measurement procedures. Recently a EuroVector EA3000 elemental analyzer (EA) was coupled to the GIS and integrated into the GICS software. First EA test measurements with standards, blanks and tree rings were performed as well as first automated overnight measurements with ampules and EA samples.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Stolz, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dewald, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heinze, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Altenkirch, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hackenberg, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Herb, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller-Gatermann, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schiffer, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zitzer, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wotte, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dunai, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-159259
DOI:	10.1016/j.nimb.2018.12.008
Journal or Publication Title:	Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
Volume:	439
Page Range:	S. 70 - 76
Date:	2019
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1872-9584
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GAS ION-SOURCE; PERFORMANCE Multiple languages Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15925