The Carbon Sublimation Source SUKO-A provides pure, highly reactive atomic carbon with a vast majority of C1 instead of the large percentage of C2 and C3 clusters (~75%) that naturally arise during the sublimation of graphite.
The extraordinary filament consists of a refractory metal tube, filled with carbon. At temperatures above 1800°C, the carbon diffuses through the tube and sublimates from its outer surface. The tube itself functions like a filter, letting pass only atomic carbon.
The University of Jena patented this technique in collaboration with Dr. Eberl MBE-Komponenten GmbH. Several publications dealing with the Atomic Carbon Sublimation Source SUKO-A have already been published. They are listed in sectionReferences / List of Publications.
The proven design of the SUKO-A prevents disturbing outgassing of undesirable material. Only pyrolytic graphite surrounds the filament. The power feedthrough is water-cooled and has been built process safe without any water or vacuum welding-seam. The direct heating of the filament by a DC power supply provides reliable and easy handling.
The SUKO-A source is in respect to its appearance and dimensions comparable to the well-proven standard Carbon Sublimation Source SUKO. In fact, it is possible to modify all existing SUKO sources into a SUKO-A and vice versa with a few spare parts in the field.
The SUKO-A is available in two sizes on either DN40CF (O.D. 2.75") or DN63CF (O.D. 4.5") flange. It can be mounted easily into common UHV analysis systems or MBE growth chambers.
Cooling shroud and shutter, highly recommended for the majority of applications, are optionally available.
Main parts of the SUKO-A assembly
The following table compares the different atomic carbon sublimation sources with respect to the required electrical power and the typical flux rates at 100 mm working distance.
DN40CF (O.D. 2.75")
DN63CF (O.D. 4.5")
DN40CF (O.D. 2.75") or DN63CF (O.D. 4.5")
Dimensions in vacuum
L=250-400 mm, D=36 or D=55 mm
refractory metal tube filled with carbon
filament completely shielded with PG parts
W5%Re/W26%Re (type C)
max. filament temperature 2300°C
water-cooled (4x Swagelok fitting connection O.D. 6 mm); water flow min. 30 l/h
separate water (or LN2) cooling shroud
integrated rotary shutter (S)
Schematic drawing of the Atomic Carbon Sublimation Source SUKO-A
is an atomic carbon sublimation source on DN63 CF-flange with shutter, in-vacuum length 300mm and diameter 55mm.