A negative ion source for alkali ions

An ion source is described which delivers negative alkali ions. With this source, which consists of a duoplasmatron and a charge exchange canal with alkali vapour, negative Li, Na and K ions are produced. The oven in which alkali metals are evaporated can reach temperatures up to 575°C

The conductance for the gas flow of an accelerating tube

Measurements of the conductance in the molecular flow region of accelerating tubes of an EN tandem are given and discussed. These measurements have been carried out on both straight and inclined field tubes. A theoretical model is constructed by means of which the conductance of an accelerating tube can be calculated. The calculated values of the conductance turn out to be in good agreement with the measured ones

A negative ion source for alkali ions

An ion source is described which delivers negative alkali ions. With this source, which consists of a duoplasmatron and a charge exchange canal with alkali vapour, negative Li, Na and K ions are produced. The oven in which alkali metals are evaporated can reach temperatures up to 575°C

Improvements in ANIS and inverted sputter sources

In this article two sputter sources, i.e. an ANIS and an inverted sputter source are described. The ANIS has been changed into a SNICS-like configuration and measurements of the output current for different sputter target geometries are presented. In the inverted sputter source an immersion lens was placed between the ionizer and the sputter target. This source is provided with a modified revolving target head with eight targets

The Utrecht accelerator facility for precision dating with radionuclides

The Utrecht facility for accelerator mass spectrometry is described. The set-up with an EN tandem accelerator is designed for measurements of a broad range of long-lived radionuclides and of stable trace elements. In particular, dating measurements with 10Be and 14C can be performed with high precision by rapid switching between the measurements of the isotopes. Optimal beam transmission through the accelerator is achieved with a new injection system in conjunction with the installation of axially symmetric acceleration tubes with spirally inclined electrodes. The first 14C/12C measurement with this set-up is reported

Accelerator mass spectrometry with 14C and 10Be in utrecht

The Utrecht facility for accelerator mass spectrometry is now in operation for routine measurements of 14C and 10Be in natural samples. Sample preparation techniques have been introduced. A 1% precision for 14C/12C ratios is routinely achieved. In the last year, more than 500 samples have been prepared and measured for various applications in archeology, geology and paleontology

The injector of the Utrecht en tandem

An injector has been built to obtain improved beam transmission through the EN tandem. The injector has been provided with a 90° analysing magnet, m/Δm = 300, and 130 kV preacceleration. Beam optics calculations have been made for the injector and tandem. The injector has been equipped with a fiber optics control and data acquisition system

The injector of the Utrecht en tandem

An injector has been built to obtain improved beam transmission through the EN tandem. The injector has been provided with a 90° analysing magnet, m/Δm = 300, and 130 kV preacceleration. Beam optics calculations have been made for the injector and tandem. The injector has been equipped with a fiber optics control and data acquisition system