Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: I-mode pedestal relaxation events in the Alcator C-Mod and ASDEX Upgrade
  tokamaks   In some conditions, I-mode plasmas can feature pedestal relaxation events
(PREs) that transiently enhance the energy reaching the divertor target plates.
To shed light into their appearance, characteristics and energy reaching the
divertor targets, a comparative study between two tokamaks $-$ Alcator C-Mod
and ASDEX Upgrade $-$ is carried out. It is found that PREs appear only in a
subset of I-mode discharges, mainly when the plasma is close to the H-mode
transition. Also, the nature of the triggering instability is discussed by
comparing measurements close to the separatrix in both devices. The PRE
relative energy loss from the confined region increases with decreasing
pedestal top collisionality $\nu_{\mathrm{ped}}^*$. In addition, the relative
electron temperature drop at the pedestal top, which is related to the
conductive energy loss, rises with decreasing $\nu_{\mathrm{ped}}^*$. Finally,
the peak parallel energy fluence due to the PRE measured on the divertor in
both devices is compared to the model introduced in [1] for type-I ELMs. The
model is shown to provide an upper boundary for PRE energy fluence data, while
a lower boundary is found by dividing the model by three. These two boundaries
are used to make projections to future devices such as DEMO and ARC.

20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat