Avoiding pitfalls: Better performance of AMS at DREAMS

Since autumn 2011, the DREsden AMS-facility (DREAMS), is performing routine AMS at the 6MV tandem accelerator of the ion beam centre (IBC) at the Helmholtz-Zentrum Dresden-Rossendorf [1,2]. In routine operation are measurements of ¹⁰Be, ²⁶Al, ³⁶Cl, ⁴¹Ca, and ¹²⁹I for a wide range of applications. Most of the samples are prepared at our own chemistry labs – or in close cooperation with the users – to allow best performance for diverse tasks [3]. Our performance to measure these routine isotopes improved considerably over the last years [2]. This successful approach needs a careful selection of measurement parameters like a propper measurement order, a specific tuning using low-level (traceable) standards and individual setting of detector parameters for each beam time. One example for an additional improvement is the low-background value of ²⁶Al/²⁷Al = 6 × 10⁻¹⁶ reached in blanks from commercial carriers. For ⁴¹Ca measurements we get 30% more transmission, while having ten times less background from ⁴¹K. Further promising developments include the upgrade to nonroutine
AMS-nuclides like ⁴⁴Ti [4] and to actinides [5].
Ref.: [1] S. Akhmadaliev et al., NIMB 294 (2013) 5.
[2] G. Rugel et al., NIMB 370 (2016) 94.
[3] S. Merchel, this conference.
[4] A. Scharf, this conference.
[5] Nasrin B. Khojasteh, this conference.