Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct observation of spatio-temporal dynamics of short electron bunches
  in storage rings   In recent synchrotron radiation facilities, the use of short (picosecond)
electron bunches is a powerful method for producing giant pulses of Terahertz
Coherent Synchrotron Radiation (THz CSR). Here we report on the first direct
observation of these pulse shapes with a few picoseconds resolution, and of
their dynamics over a long time. We thus confirm in a very direct way the
theories predicting an interplay between two physical processes. Below a
critical bunch charge, we observe a train of identical THz pulses (a broadband
Terahertz comb) stemming from the shortness of the electron bunches. Above this
threshold, a large part of the emission is dominated by drifting structures,
which appear through spontaneous self-organization. These challenging
single-shot THz recordings are made possible by using a recently developed
photonic time stretch detector with a high sensitivity. The experiment has been
realized at the SOLEIL storage ring.

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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: eess
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
2
The categories of this paper are: math