93 citations · 416 across the 16 of their papers we have counts for
6 papers · 1 filter
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…
A Bitter-type electromagnet for complex atomic trapping and manipulation
J. L. Siegel, D. S. Barker, J. Fedchak +2
We create a pair of symmetric Bitter-type electromagnet assemblies capable of producing multiple field configurations including uniform magnetic fields, spherical quadruple traps,…
A radiofrequency voltage-controlled current source for quantum spin manipulation
D. S. Barker, A. Restelli, J. A. Fedchak +2
We present a design for a wide-bandwidth, voltage-controlled current source that is easily integrated with radiofrequency magnetic field coils. Our design uses current feedback to…
Quantum-based vacuum metrology at NIST
Julia Scherschligt, James A. Fedchak, Zeeshan Ahmed +10
The measurement science in realizing and disseminating the unit for pressure in the International System of Units (SI), the pascal (Pa), has been the subject of much interest at th…
A 3D-printed alkali metal dispenser
Eric B. Norrgard, Daniel S. Barker, James A. Fedchak +3
We demonstrate and characterize a source of Li atoms made from direct metal laser sintered titanium. The source's outgassing rate is measured to be \,$\rm{Pa}…