TY  - GEN
ID  - heidok33299
CY  - Heidelberg
AV  - public
Y1  - 2023///
TI  - Refining Argon Trap Trace Analysis - Crucial Features and Characterization Tools for Reliable Routine Measurements
N2  - Argon Trap Trace Analysis resolves 39Ar concentrations at the 10?16 level. Perfect selectivity is achieved by exploiting the isotopic shift and a high number of photon scattering processes for detection. However, good measurement precision requires high count rates of39Ar atoms. Therefore, this work presents crucial features and characterization tools for reliable routine measurements.
A new instrument for absolute quantization of the metastable 40Ar flux is developed and put into operation. The magneto-optical trap loading rate is evaluated and established as
a standard characterization tool. It is part of the new collimator alignment procedure that resulted in a factor of 1.5 higher 39Ar count rate. Other improved alignment procedures are presented. In addition, a new laboratory control and monitoring system for stable day-to-day measurements is developed and installed.
The second part focuses on the study of sources of metastable atoms. Two radio frequency (RF) antennas and two cooling devices are presented and their main features are analyzed. A new LN2-dewar for cooling reduces the amount of liquid nitrogen consumed by a factor of 3 to 5. In combination with the established RF antenna, increasing the source pressure to 2.0 × 10?5 mbar leads to 50% higher metastable flux, while the atoms slow down longitudinally.
A1  - Robertz, Julian Frederick
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/33299/
ER  -