93 citations · 416 across the 16 of their papers we have counts for
17 papers
On the effect of "glancing" collisions in the cold atom vacuum standard
Stephen P. Eckel, Daniel S. Barker, James A. Fedchak +3
We theoretically investigate the effect of ``glancing" collisions on the ultra-high vacuum (UHV) pressure readings of the cold atom vacuum standard (CAVS), based on either ultracol…
Accurate measurement of the loss rate of cold atoms due to background gas collisions for the quantum-based cold atom vacuum standard
Daniel S. Barker, James A. Fedchak, Jacek Kłos +4
We present measurements of thermalized collisional rate coefficients for ultra-cold Li and Rb colliding with room-temperature He, Ne, N, Ar, Kr, and Xe. In our exper…
Comparison of two multiplexed portable cold-atom vacuum standards
Lucas H. Ehinger, Bishnu P. Acharya, Daniel S. Barker +4
We compare the vacuum measured by two portable cold-atom vacuum standards (pCAVS) based on ultracold Li atoms. The pCAVS are quantum-based standards that use a priori scatterin…
A constant pressure flowmeter for extreme-high vacuum
S. Eckel, D. S. Barker, J. Fedchak +3
We demonstrate operation of a constant-pressure flowmeter capable of generating and accurately measuring flows as low as mol/s. Generation of such small flows is…
Stability of bakeable capacitance diaphragm gauges
Julia Scherschligt, Daniel Barker, Stephen Eckel +2
Here, we study the stability of capacitance diaphragm gauges. We focus on their stability before and after a controlled series of bakes. We find that baking results in appreciable…
Outgassing rate comparison of seven geometrically similar vacuum chambers of different materials and heat treatments
James A. Fedchak, Julia K. Scherschligt, Sefer Avdiaj +5
We have measured the water and hydrogen outgassing rates of seven vacuum chambers of identical geometry but constructed of different materials and heat treatments. Chambers of five…