Slits

For a variety of applications involving the control of ion beam size and current, NEC manufactures three basic models of beam defining slit systems varying in beam power ratings and geometries. Contact us to start an order.

 

Applications

NEC slits are ideal for applications requiring accurate control of beam size, determination of beam divergence, or limiting beam current. Ours slits are designed for use on high energy electrostatic accelerators or injection and high energy beamlines of medium to high current.

 

Slit Design

There are two slit elements per axis in each slit system. The slit element assemblies utilize all metal seals to the slit housing, with motion transmitted to the elements through stainless steel welded bellows. This allows for ultra high vacuum use.

The beam aperture material and the slit elements are either molybdenum or tantalum, allowing for beam power of up to 1000 W (BDS6) without melting the elements.

Custom element materials are also available upon request.

NEC produces three standard models of slits, with various configurations and options for each model. Below is a brief description of each model.

 

Model	Beam Power Rating	Maximum aperture	Features
BDS6	1000W per element	1.5″ (3.8cm)	For High Power Ion Beams De-ionized water cooling. Molybdenum slit elements (tantalum elements optional). Cylindrical elements in cross section, providing maximum cooling. 24 VDC motor drives (motorized versions only).
BDS8	50W per element (100W optional)	1.2″ (3.0cm)	For Lower Power Ion Beams Radiation cooling. Tantalum slit elements. Beveled edge element design, minimizing slit edge scatter (other element designs available. 24 VDC motor drives (motorized versions only).
BDS18	50W per element (100W optional)	2.0″ (5.1cm)	For Large Diameter & Lower Power Ion Beams Radiation cooling. Tantalum slit elements. Beveled edge element design, minimizing slit edge scatter (other element designs available). Stepper motor drives (motorized versions only).

Wondering which model is best for you? Contact us.

 

Options

All three models are available in manual or motorized versions. They are also all available as either single axis (2-jaw) or double axis (4-jaw). Several slit element options for the BDS8 and BDS18 are available:

• Beveled edge design: most common configuration, which minimizes slit edge scattering of the ion beam and provides optimal beam energy control.
• Folded edge design: for applications requiring complete closure.
• Square edge design: provides most resistance to sputter erosion.
• Furrowed design: based on beveled edge design with furrows to increase surface area, increasing power rating to 100 W.

 
Please contact NEC for more information on slit element configurations.

 

Accessories

Manual Slits: A complete manual slit system includes:

• Slit system: BDS6, BDS8, or BDS18.
• Slit current monitor: NEC offers a slit current monitor with four meters for simultaneous display of individual element currents and switchable to monitor up to three different slit assemblies on the front panel.
• Log amplifier: We offer a complete line of dual channel log amplifiers.

 

Motorized Slits: A complete motorized slit system includes:

• Slit system: Motorized BDS6, BDS8, or BDS18.
• Controller: For motorized BDS6 and BDS8 slits, NEC offers a local and a remote controller. These controllers provide independent slit element position controls, slit position readout, and connectors for monitoring the current on each slit element. Please contact NEC for information regarding control of the BDS18.
• Log amplifier (as needed).

 

Please contact NEC for more information on these components.

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Slits