Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design and test of SX-FEL cavity BPM   This paper reports the design and cold test of the cavity beam position
monitor (CBPM) for SX-FEL to fulfill the requirement of beam position
measurement resolution of less than 1{\mu}m, even 0.1{\mu}m. The CBPM was
optimized by using a coupling slot to damp the TM010 mode in the output signal.
The isolation of TM010 mode is about 117dB, and the shunt impedance is about
200{\Omega}@4.65GHz with the quality factor 80 from MAFIA simulation and test
result. A special antenna was designed to load power for reducing excitation of
other modes in the cavity. The resulting output power of TM110 mode was about
90mV/mm when the source was 6dBm, and the accomplishable minimum voltage was
about 200{\mu}V. The resolution of the CBPM was about 0.1{\mu}m from the linear
fitting result based on the cold test.

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The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
37
The categories of this paper are: supr-con