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BALTAZAR, Laser ARPES facility

Bi-purpose Angle-resolving Laser-based Time-of-flight AnalyZer for Advanced Research

LASER based ARPES enters the third dimension!

Design view of BALTAZAR

BALTAZAR is the next generation of research tools for the study of electronic structure of solids. Angle resolved photoelectron spectroscopy (ARPES) is a very powerful tool to study the electronic structure of solids. The latest advances in ARPES uses high power lasers as a light source for ARPES. BALTAZAR uses laser based high-harmonic-generation to produce the highest energy photons used in any laser ARPES system currently in operation. The system delivers 10.5 eV photons with a repetion rate of 0.2 - 8 MHz. The typical repetition rate of the laser system is 0.5 - 1 MHz. Furthermore, the use of a Time-Of-Flight (TOF) electron analyzer permits ARPES to enter the third dimension and measure energy and momentum in one+two dimensions. In contrast to hemispherical analyzers, the TOF analyzer allows the complete in plane momentum to be mapped in a single measurement. The result is a system capable of very detailed measurements on some of the currently most exciting low dimensional materials. For a more in depth presentation of Baltazar and the future science that is planned, download the presentation on the right.
Target values and current status for a few key parameters of BALTAZAR are given in the table below.

Parameters for BALTAZAR
Parameter Target value Current value
Photon energy 10.5 eV 10.5 eV
Flux > 10^13 ph/s 8*10^12 ph/s
Over all energy resolution < 1 meV 5 meV
k-space resolution < 0.001 Å-1 <0.01 Å-1
Count rate > 300 kcps > 1000 kcps
Temperature range 5-350 K 7.5-350 K
Spot size (circular) < 0.01 mm2 0.04 mm2

BALTAZAR is financed by the Knut & Alice Wallenberg foundation.

Page responsible:Oscar Tjernberg
Belongs to: Applied Physics
Last changed: Oct 31, 2012