Dresden EBIT/EBIS Ion Sources
EBIS sources are the most powerful sources of ions with the highest charge states up to fully stripped ions. The basic idea of an EBIS is to generate a dense energetic electron beam by magnetic beam compression. The magnetic field can be produced by superconducting coils or by room-temperature permanent magnets. Atoms injected into the electron beam are ionized by successive electron impacts. The ions are extracted by switching the potentials of an electric trap. The time characteristics of the extracted ion pulses depends on the parameters of the pulsed extraction field along the z-axis of the trap. EBIS sources are usually operated at low residual gas pressures down to 10-10 mbar and at electron energies high enough to produce ions of almost all charge states. EBIS devices are reliable for injection into different accelerators and for a wide field of applications.
Three generations of highly-innovative room temperature EBIS/EBIT ion sources of highly charged ions have been developed by DREEBIT GmbH Dresden science 1999 (i.e. the Dresden EBIT, Dresden EBIS and Dresden EBIS-A in order of increasing extractable current). A new class of high-current ion sources, the so-called Dresden EBIS-SC, is now available, too.
The produced ions can be extracted as
- ion pulses or
- DC beams (leaky mode).
Dresden EBIS/EBIT are excellent sources of electromagnetic radiation (photons) from highly charged ions, such as
- visible light.
Room Temperature Ion Sources
The source design based on permanent magnets is unique in the world and results in very compact devices. Thus, they are portable, simple to operate, and both initial and maintenance costs are small.
The EBIS/T can be feed with gaseous elements trough a precision leak valve, but also by metals using a MIVOC system or an external metal injection system (e.g. Liquid Metal Ion Source).
Advantages of Dresden EBIS/T Ion Sources
- production of bare nuclei for elements up to Z=28
- production of helium-like ions for elements up to molybdenum
- neon-like ions for high-Z elements
- beam emittance in the range of some mm mrad
- pulsed mode and DC extraction operation
- standard UHV techniques allows pressures of up to 1E-10 mbar in the trap region
- compact design based on permanent magnets
A Superconducting Ion Source - the Dresden EBIS-SC
DREEBIT's latest release - the Dresden EBIS-SC - is a compact superconducting ion source, which is based on modern principles of low temperature physics and electron beam technology. Due to the longer drift tube section and the higher maximum electron beam current the EBIS-SC is capable to produce ion beam currents higher by a factor of about 100 compared to the strongest room temperature EBIS (EBIS-A). Hence, the extracted ion beam can reach currents up to some µA (measured for protons). A magnetic field strength of up to 6 T realizes a high electron beam compression resulting in effective electron beam current densities of some 100 A/cm2, or more. The shape of the extracted pulses can be varied from Gaussian up to flat-top shapes.
EBIS-SC Key Features
- magnetic field of up to 6 T
- electron beam current of up to 700 mA
- trap length of 20 cm
- high ion beam currents for low-Z elements
- liquid helium free refrigerator technique
- particle injection via MIVOC and MEVVA
- Gaussian or flat-top shaped pulses
- pulse widths from about 10 µs up to 100 µs
Compared Parameters of Dresden EBIS/T Sources
|Parameter||Dresden EBIT||Dresden EBIS||Dresden EBIS-A||Dresden EBIS-SC|
|Trap length||2 cm||6 cm||6 cm||20 cm|
|max. electron beam current||50 mA||200 mA||200 mA||up to 700 mA|
|max. electron energy||15 keV||20 keV||25 keV||25 keV|
|Magnet (Material)||Permanent SmC||Permanent NdFeB||Permanent NdFeB||Superconducting LHe-free|
|Magnetic induction on axis||250 mT||400 mT||600 mT||6 T|