Electron Beam Ion Trap EBIT

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... 

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],... 

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... 

The experimental configuration is shown in Fig. 1. The EBIT uses an intense and mono-energetic electron beam which is magnetically confined to trap and ionize charged ions. Metal ion species such as vanadium are created by a metal vapour vacuum arc (MEVVA) and are sequentially ionized as they enter the trap region of the electron beam. The NIST EBIT and spectra are described in further detail elsewhere [13,14]. 

Electron Beam Ion Source (EBIS) and Ion Trap (EBIT). 2333... 

Some ion sources and fusion facilities in the plasma plane. PIG Penning Ion Gauge, ECRIS Electron Cyclotron Resonance Ion Source, EBIS/EBIT Electron Beam Ion Source or Trap, laser plasma produced by laser ablation in solids, tokamak fusion device of light ions, fully stripped uranium ion... 

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