Beam Viewing Systems-BVS

Beam Viewing System Dimensions

Beam Viewing System Specifications

Model BVS-1, BVS-2 and optional BVS-1-OPT02 CCD Camera System

Colutron Research presents the new BVS-1 and BVS-2 Beam Viewing Systems. The BVS systems provide an easy, quick and low cost solution for beam profile analysis of electron, ion, and neutral beams as well as UV and X-rays. The compact systems measure 2" long (50.8mm) and adapt to standard 2 3/4" (BVS-1) and 4.5" (BVS-2) conflat flanges. The systems provide viewing areas of 19mm (BVS-1) and 44mm (BVS-2) in diameter. The image is formed using a microchannel plate (MCP) in combination with a phosphor screen. This arrangement makes it possible to analyze a much wider range of beam intensities and energies than the conventional stand alone phosphor screen method. Integral MHV vacuum feedthroughs are used to safely apply high voltages required by the MCP and phosphor screen. The system is suitable for ultra-high vacuum (UHV) applications. Options available include: dual MCP stack for increased gain, MCP performance enhancement coatings for UV and x-rays, beam attenuation grids to prolong MCP lifetime when monitoring high intensity beams, and an attachable CCD camera for monitoring or recording the image from a remote location (sample picture of hydrogen ion beam taken with BVS-1 and CCD camera). Optional microsphere (MSP) plates are also available in a single or dual stack. These plates have higher gain per stage, no ion feedback, and less severe vacuum requirements than MCPs, but have poorer spatial resolution (see MSP - MCP Comparison Chart  and  Beam Viewing System Specifications). The BVS Internal Detector Assembly (IDA) is also available separately, if the BVS glass port vacuum chamber is not required. Also, a Power Supply Control Unit (PCU) is available. Some typical applications for the BVS systems include:
   

Beam Viewing System Dimensions

    Schematic View of Model BVS-1

 

Schematic View of Model BVS-2

 

Imaging Area:

19mm Diameter (BVS-1), 44mm (BVS-2)

MCP: (Standard)

0.975" Diameter (BVS-1), 1.970" Diameter (BVS-2)
10 micron channel diameter
Max. Gain: 2.0 X 10⁴ (single plate, Std.) 1.0 X 10⁷ (chevron, OPT01)
Performance enhancement coatings (OPT08) to enhance the detection efficiency are available for the input MCP.

MSP: (Option BVS-1-OPT06/OPT07 or BVS-2-OPT06/OPT07 )

0.980" Diameter (BVS-1), 1.970" Diameter (BVS-2)
Sphere diameter: 50 microns
spatial resolution: 2 lp/mm
Max. Gain:

1.5 X 10⁶ At 3000V single plate (OPT06),
1.0 X 10⁹ At 2000V per plate, dual plate (OPT07)

Phosphor Screen:

P-20 on aluminized glass plate
Conversion efficiency :h = 0.063photons/eV/electron
P-20 Peak Wavelength:l = 560 nm

Power Supply Requirements:

0 - + 1000V, 1mA single MCP (Standard)
0 - + 2000V, 1mA dual MCP (Opt01)
0 - + 5000V, 1 mA Phosphor Screen

Beam Energy Range:

1 eV to over 50 keV

Beam Current Range:

< 10 micro-amps (with optional beam attenuation grids)

Vacuum:

1 X 10^-6 Torr or better required to operate MCP, 1 X 10^-5 or better to operate MSP
Good to at least 1 X 10^-10 Torr; Maximum bakeout temp. 350° C

Attenuation Grids (Option OPT03, OPT04, OPT05) Recommended for:

Ion beams greater than 3.2 nA/mm2, 90% beam attenuation (1 grid, OPT03)
Ion beams greater than 31.8 nA/mm2, 99% beam attenuation (2 grids, OPT04)
Ion beams greater than 318.nA/mm2, 99.9% beam attenuation (3 grids, OPT05)

The picture above was made with the Colutron model G-2 ion gun, BVS-1 viewing system
with optional CCD camera (BVS-1-OPT02) and image processing system (IPS-1). The picture
shows the spatial profile of H₃⁺ (at top), H₂⁺ (middle) and H⁺ ion beams. The velocity filter
dispersion was set low to get all three ion beams onto the viewing area of the BVS-1.

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