Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design of the 7 MeV/u, 217 MHz Injector Linac for the Proposed Ion Beam
  Facility for Cancer Therapy at the Clinic in Heidelberg   A dedicated clinical synchrotron facility for cancer therapy using energetic
proton and ion beams (C, He and O) has been designed at GSI for the
Radiologische Universitaetsklinik at Heidelberg, Germany. The design of the
injector linac is presented. Suitable ion sources are discussed and results of
ion source test measurements are reported. The LEBT allows for switching
between two ion sources. A short RFQ accelerates the ions from 8 keV/u to 400
keV/u. It is followed by a very compact beam matching section and a 3.8 m long
IH-type drift tube linac for the acceleration to 7 MeV/u. Both rf structures
are designed for a resonance frequency of 216.816 MHz and for ion
mass-to-charge ratios up to A/q = 3 (12C4+, (H_3)+, 3He+, 16O6+).

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The categories of this paper are: supr-con
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat