Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: RF design of APEX2 two-cell continuous-wave normal conducting
  photoelectron gun cavity based on multi-objective genetic algorithm   High brightness, high repetition rate electron beams are key components for
optimizing the performance of next generation scientific instruments, such as
MHz-class X-ray Free Electron Laser (XFEL) and Ultra-fast Electron
Diffraction/Microscopy (UED/UEM). In the Advanced Photo-injector EXperiment
(APEX) at Berkeley Lab, a photoelectron gun based on a 185.7 MHz normal
conducting re-entrant RF cavity, has been proven to be a feasible solution to
provide high brightness, high repetition rate electron beam for both XFEL and
UED/UEM. Based on the success of APEX, a new electron gun system, named APEX2,
has been under development to further improve the electron beam brightness. For
APEX2, we have designed a new 162.5 MHz two-cell photoelectron gun and achieved
a significant increase on the cathode launching field and the beam exit energy.
For a fixed charge per bunch, these improvements will allow for the emittance
reduction and hence an increased beam brightness. The design of APEX2 gun
cavity is a complex problem with multiple design goals and restrictions, some
even competing each other. For a systematic and comprehensive search for the
optimized cavity geometry, we have developed and implemented a novel
optimization method based on the Multi-Objective Genetic Algorithm (MOGA).

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The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas