An electrostatic energy analyzer for longitudinal energymeasurements Page: 2 of 18
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Recently an electrostatic energy analyzer has been employed to measure
the longitudinal energy profile of the cesium ion beams used in the single
beam transport experiment (SBTE) and -in the multiple beam experiment (MBE-4)
now under construction. This note contains a description of the energy
analyzer as well as a presentation of the results of the longitudinal energy
measurements performed on SBTE.
The energy analyzer is a sector analyzer designed to present an electro-
static cylindrical field to the incoming ions. A sketch showing the analy-
zer's dimensions appears in Figure 1.
There are three important relations characterizing the energy analyzer.
The first is the linear relation between the electrode potential difference
and the kinetic energy of the ions traveling on the central path. This is:
T(KeV) = 0.008998 x V(volt). (1)
The second important relation relates the transverse displacement of the
slit aperture's image produced by a group of ions to the proportional de-
viation of their kinetic energy from the kinetic energy of the ions on the
central path. The paraxial, zero space charge derivation yields:
y(in.) = 18.0 in. x (T-To)/To (2)
where y = transverse displacement
T = energy of the ions arriving at
To = energy of ions on the central path.
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Sato, A.H. An electrostatic energy analyzer for longitudinal energymeasurements, report, September 1, 1985; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc876366/m1/2/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.