bvs

Beam Viewing Systems - BVS

	Beam Viewing System Dimensions

	Beam Viewing System Specifications

model BVS-1, BVS-2
and optional BVS-1-OPT 02 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 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:

Applications:

Single Particle Position Sensitive Detection

Beam Line Diagnostics

Real Time Image Analysis

Beam Profile Analysis (beam tuning)

Mass Spectrometry (mass and dispersion determination)

Low Energy and Low Intensity Beam Imaging

X-ray Spectroscopy

Field Ion Microscopy

Beam Viewing System dimensions

Beam Viewing System specifications
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, OPT 01)
	Performance enhancement coatings (OPT 08) to enhance the detection efficiency are available for the input MCP.

Option	Coating Type	Radiation Type Enhanced	Energy Range	Coating Thickness (Å)	Coating Extension (Channel Diameters)
OPT 08-CuI	CuI	UV	200 ~ 2,000 Å	3,000	1.5
OPT 08-CsI	CsI	UV	200 ~ 2000 Å	3,000	1.5
OPT 08-MgFl2	MgFl₂	UV	350 ~ 1,200 Å	3,000	1.5
OPT 08-KBr	KBr	X-Ray	0.2 ~ 9 keV	3,000	1.5


	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 3,000V single plate (OPT 06),
		1.0 x 10⁹ at 2,000V per plate, dual plate (OPT 07)

Phosphor Screen:

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

Power Supply Requirements:

0 ~ + 1,000V, 1mA single MCP (Standard)
0 ~ + 2,000V, 1mA dual MCP (Opt 01)
0 ~ + 5,000V, 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 OPT 03, OPT 04, OPT 05) Recommended for:

Ion beams greater than 3.20 nA/mm², 90.0% beam attenuation (1 grid, OPT 03)
Ion beams greater than 31.8 nA/mm², 99.0% beam attenuation (2 grids, OPT 04)
Ion beams greater than 318.nA/mm², 99.9% beam attenuation (3 grids, OPT 05)

The picture above was made with the Colutron model G-2 ion gun, BVS-1 viewing system with optional CCD camera (BVS-1-OPT 02) 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.

	Local sales representative in Japan
Colutron Research Corporation	APACE Science

2321 Yarmouth Avenue, Boulder, Colorado 80301 U.S.A.		Mitomo-Bldg.#2 - 6F, Ebisu-nishi 2-Chome, 2 - 8, Shibuya-Ku, Tokyo 150-0021 Japan
phone# Fax#	+1 (303) 443-5211 +1 (303) 449-5050	phone# Fax#	+81 (0)3 - 3463 - 3204 +81 (0)3 - 3463 - 3205
contact:	Erik Wahlin, Ph.D.
e-mail:	erik@colutron.com
web:	http://www.colutron.com/		( Last updated: )

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