Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel optical interferometry of synchrotron radiation for absolute
  electron beam energy measurements   A novel interferometric method is presented for the measurement of the
absolute energy of electron beams. In the year 2016, a pioneering experiment
was performed using a 195 MeV beam of the Mainz Microtron (MAMI). The
experimental setup consisted of two collinear magnetic undulators as sources of
coherent optical synchrotron light and a high-resolving grating monochromator.
Beam energy measurements required the variation of the relative undulator
distance in the decimeter range and the analysis of the intensity oscillation
length in the interference spectrum. A statistical precision of 1 keV was
achieved in 1 hour of data taking, while systematic uncertainties of 700 keV
were present in the experiment. These developments aim for a relative precision
of $10^{-5}$ in the absolute momentum calibrations of spectrometers and
high-precision hypernuclear experiments. Other electron accelerators with beam
energies in this regime such as the Mainz Energy Recovering Superconducting
Accelerator (MESA) might benefit from this new method.

1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph