Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum SASE FEL with laser wiggler   In this letter we specify the physical parameters necessary to operate a SASE
FEL in the quantum regime with a laser wiggler. We also show that this is more
feasible in the quantum regime than in the classical one. Specific examples are
given.

6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin