Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precision beam energy measurement by undulator radiation at MAMI   A novel interferometric method for absolute beam energy measurement is under
development at MAMI. At the moment, the method is tested and optimized at an
energy of 195 MeV. Despite the very small statistical uncertainty of the
method, systematic effects have limited the overall accuracy. Recently, a
measurement has been performed dedicated to the evaluation of these effects.
This report comprises a description of the method and results of the recent
data taking period.

26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin