Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High brightness fully coherent X-ray amplifier seeded by a free-electron
  laser oscillator   X-ray free-electron laser oscillator (XFELO) is expected to be a cutting edge
tool for fully coherent X-ray laser generation, and undulator taper technique
is well-known for considerably increasing the efficiency of free-electron
lasers (FELs). In order to combine the advantages of these two schemes, FEL
amplifier seeded by XFELO is proposed by simply using a chirped electron beam.
With the right choice of the beam parameters, the bunch tail is within the gain
bandwidth of XFELO, and lase to saturation, which will be served as a seeding
for further amplification. Meanwhile, the bunch head which is outside the gain
bandwidth of XFELO, is preserved and used in the following FEL amplifier. It is
found that the natural "double-horn" beam current as well as residual energy
chirp from chicane compressor are quite suitable for the new scheme. Inheriting
the advantages from XFELO seeding and undulator tapering, it is feasible to
generate nearly terawatt level, fully coherent X-ray pulses with unprecedented
shot-to-shot stability, which might open up new scientific opportunities in
various research fields.

21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat