skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Note: A versatile radio-frequency source for cold atom experiments

Abstract

A radio-frequency (RF) source designed for cold atom experiments is presented. The source uses AD9858, a direct digital synthesizer, to generate the sine wave directly, up to 400 MHz, with sub-Hz resolution. An amplitude control circuit consisting of wideband variable gain amplifier and high speed digital to analog converter is integrated into the source, capable of 70 dB off isolation and 4 ns on-off keying. A field programmable gate array is used to implement a versatile frequency and amplitude co-sweep logic. Owing to modular design, the RF sources have been used on many cold atom experiments to generate various complicated RF sequences, enriching the operation schemes of cold atoms, which cannot be done by standard RF source instruments.

Authors:
; ; ; ;  [1];  [2]
  1. Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22597662
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AMPLIFIERS; AMPLITUDES; ATOMS; CONTROL; DIGITAL-TO-ANALOG CONVERTERS; MHZ RANGE 100-1000; OPERATION; RADIOWAVE RADIATION; RESOLUTION; VELOCITY

Citation Formats

Li, Na, Wu, Yu-Ping, Min, Hao, Yang, Tao, Jiang, Xiao, E-mail: jiangx@ustc.edu.cn, and CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026. Note: A versatile radio-frequency source for cold atom experiments. United States: N. p., 2016. Web. doi:10.1063/1.4961640.
Li, Na, Wu, Yu-Ping, Min, Hao, Yang, Tao, Jiang, Xiao, E-mail: jiangx@ustc.edu.cn, & CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026. Note: A versatile radio-frequency source for cold atom experiments. United States. doi:10.1063/1.4961640.
Li, Na, Wu, Yu-Ping, Min, Hao, Yang, Tao, Jiang, Xiao, E-mail: jiangx@ustc.edu.cn, and CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026. 2016. "Note: A versatile radio-frequency source for cold atom experiments". United States. doi:10.1063/1.4961640.
@article{osti_22597662,
title = {Note: A versatile radio-frequency source for cold atom experiments},
author = {Li, Na and Wu, Yu-Ping and Min, Hao and Yang, Tao and Jiang, Xiao, E-mail: jiangx@ustc.edu.cn and CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026},
abstractNote = {A radio-frequency (RF) source designed for cold atom experiments is presented. The source uses AD9858, a direct digital synthesizer, to generate the sine wave directly, up to 400 MHz, with sub-Hz resolution. An amplitude control circuit consisting of wideband variable gain amplifier and high speed digital to analog converter is integrated into the source, capable of 70 dB off isolation and 4 ns on-off keying. A field programmable gate array is used to implement a versatile frequency and amplitude co-sweep logic. Owing to modular design, the RF sources have been used on many cold atom experiments to generate various complicated RF sequences, enriching the operation schemes of cold atoms, which cannot be done by standard RF source instruments.},
doi = {10.1063/1.4961640},
journal = {Review of Scientific Instruments},
number = 8,
volume = 87,
place = {United States},
year = 2016,
month = 8
}
  • We present a dual-species oven and Zeeman slower setup capable of producing slow, high-flux atomic beams for loading magneto-optical traps. Our compact and versatile system is based on electronic switching between different magnetic field profiles and is applicable to a wide range of multi-species experiments. We give details of the vacuum setup, coils, and simple electronic circuitry. In addition, we demonstrate the performance of our system by optimized, sequential loading of magneto-optical traps of lithium-6 and cesium-133.
  • Despite of high plasma density, helicon plasma has not yet been applied to a large area ion source such as a driver for neutral beam injection (NBI) system due to intrinsically poor plasma uniformity in the discharge region. In this study, a radio-frequency (RF) ion source with multi-helicon plasma injectors for high plasma density with good uniformity has been designed and constructed for the NBI system of Versatile Experiment Spherical Torus at Seoul National University. The ion source consists of a rectangular plasma expansion chamber (120 × 120 × 120 mm{sup 3}), four helicon plasma injectors with annular permanent magnetsmore » and RF power system. Main feature of the source is downstream plasma confinement in the cusp magnetic field configuration which is generated by arranging polarities of permanent magnets in the helicon plasma injectors. In this paper, detailed design of the multi-helicon plasma injector and plasma characteristics of the ion source are presented.« less
  • A novel home-built system for imaging cold atom samples is presented using a readily available astronomy camera which has the requisite sensitivity but no timing-control. We integrate the camera with LabVIEW achieving fast, low-jitter imaging with a convenient user-defined interface. We show that our system takes precisely timed millisecond exposures and offers significant improvements in terms of system jitter and readout time over previously reported home-built systems. Our system rivals current commercial “black box” systems in performance and user-friendliness.
  • A storage ion source has been built for the production of vibrationally cold H/sup +//sub 2/ and H/sup +//sub 3/ ions. Using a gas mixture of H/sub 2/ and rare gases (Ne and He) in the source at high pressure, higher vibrational states of these ions have been effectively depleted by ion--molecule reactions and collisional deactivation. The internal energy of the cold ions was determined by the threshold measurement of collision-induced dissociation. With a mixture of H/sub 2/ and Ne (ratio 1 : 5) in the source operated at 80 mTorr, H/sup +//sub 2/ ions were found to be inmore » v = 0 and 1 states only and the H/sup +//sub 3/ ions were in the ground vibrational state.« less