Electron beam, ion trap

A.J. Gonzalez Martinez, J.R. Crespo L6pez-Urrutia, J. Braun, G. Brenner, H. Bruhns, A. Lapierre, et al., State-selective quantum interference observed in the recombination of highly charged Hg75+"78+ mercury ions in an electron beam ion trap, Phys. Rev. Lett. 94 (20) (2005) 203201. 

Second, the velocity distribution function (VDF) of hot electrons was directly measured to clarify the energy deposition process using X-ray line polarization spectroscopy. When the plasma has electromagnetic field anisotropy, polarized X-rays corresponding to the magnetic quantum number are emitted. In the case of polarization spectroscopy in an electron beam ion trap (EBIT) [21], the polarization degree P is generally defined by... 

Beiersdorfer P, Slater M (2001) Measurement of the electron cyclotron energy component of the electron beam of an electron beam ion trap. Phys Rev E 64 066408-1-6... 

Abstract. Absolute measurements of the energies of helium-like vanadium resonances on an electron beam ion trap (EBIT) axe reported. The results agree with recent theoretical calculations and the experimental precision (27-MO ppm) lies at the same level as the current uncertainty in theory (0.1 eV). The measurements represent a 5.7%-8% determination of the quantum electrodynamics (QED) contribution to the transition energies and are the most precise measurements of the helium-hke resonances in the Z = 19—31 range. These are the first precision X-ray measurements on the National Institute of Standards and Technology EBIT and strongly commend the EBIT as a new spectroscopic source for QED investigations. 

Most precision spectroscopy of medium Z ions has been conducted at accelerators or tokamak plasmas, but the recent development of the electron beam ion trap (EBIT) has offered a new spectroscopic source to experimenters. Our experimental method takes advantage of the Doppler free and relatively clean spectra produced by an EBIT and is coupled with an external calibration source to allow absolute measurement of highly charged ions. These are the first precision X-ray measurements conducted at the NIST EBIT [12],... 

X-Ray Spectroscopy of Hydrogen-Like Ions in an Electron Beam Ion Trap... 

In this paper, we summarise our progress towards Is Lamb shift measurements on medium Z hydrogen-like ions produced in an electron beam ion trap (EBIT), where the X-ray emission is free from the problems of satellite contamination and Doppler shifts. In this context, we note that a measurement of the Is Lamb shift in hydrogen-like Mg11+ has been performed at the Livermore EBIT using a quasimonolithic crystal setup, and reaching a precision of 13% for the Lamb shift dominated by counting statistics [14]. With our setup, the... 

Our experimental setup consists of a Johann-type X-ray spectrometer [15] coupled to the Oxford electron beam ion trap [16], as shown in Fig.2. 

The use of a Johann-type curved crystal spectrometer and an electron beam ion trap allow us to obtain X-ray specta of the Lyman-a lines of medium Z... 

J. R,. Crespo Lopez-Urrutia, B. Bapat, J. Ullrich Spectroscopy of Few-Electron, Highly Charged Ions with the Freiburg Electron Beam Ion Trap FreEBIT . Presented at ICAP, Florence, June 4-9, 2000 Book of abstracts, p.178... 

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