Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SNS Superconducting Cavity Modeling -Iterative Learning Control   The SNS SRF system is operated with a pulsed beam. For the SRF system to
track the repetitive reference trajectory, a feedback and a feedforward
controllers has been proposed. The feedback controller is to guarantee the
closed loop system stability and the feedforward controller is to improve the
tracking performance for the repetitive reference trajectory and to suppress
the repetitive disturbance. As the iteration number increases, the error
decreases.

17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex