Overview of the COMPASS results

Publication Name: Nuclear Fusion

Publication Date: 2022-04-01

Volume: 62

Issue: 4

Page Range: Unknown

Description:

COMPASS addressed several physical processes that may explain the behaviour of important phenomena. This paper presents results related to the main fields of COMPASS research obtained in the recent two years, including studies of turbulence, L-H transition, plasma material interaction, runaway electron, and disruption physics: Tomographic reconstruction of the edge/SOL turbulence observed by a fast visible camera allowed to visualize turbulent structures without perturbing the plasma. Dependence of the power threshold on the X-point height was studied and related role of radial electric field in the edge/SOL plasma was identified. The effect of high-field-side error fields on the L-H transition was investigated in order to assess the influence of the central solenoid misalignment and the possibility to compensate these error fields by low-field-side coils. Results of fast measurements of electron temperature during ELMs show the ELM peak values at the divertor are around 80% of the initial temperature at the pedestal. Liquid metals were used for the first time as plasma facing material in ELMy H-mode in the tokamak divertor. Good power handling capability was observed for heat fluxes up to 12 MW m-2 and no direct droplet ejection was observed. Partial detachment regime was achieved by impurity seeding in the divertor. The evolution of the heat flux footprint at the outer target was studied. Runaway electrons were studied using new unique systems - impact calorimetry, carbon pellet injection technique, wide variety of magnetic perturbations. Radial feedback control was imposed on the beam. Forces during plasma disruptions were monitored by a number of new diagnostics for vacuum vessel (VV) motion in order to contribute to the scaling laws of sideways disruption forces for ITER. Current flows towards the divertor tiles, incl. possible short-circuiting through PFCs, were investigated during the VDE experiments. The results support ATEC model and improve understanding of disruption loads.

Open Access: Yes

DOI: 10.1088/1741-4326/ac301f

Authors - 100

S. Brezinsek

6603110179

M. Gobbin

16174869000

W. Bin

22233459600

K. Bogár

57702480100

I. Borodkina

56768005800

P. Buratti

7003485039

J. Seidl

35198965200

M. Peterka

36600986000

A. Kallenbach

8594928000

N. Patel

59806301800

O. Kovanda

59090727000

A. Podolnik

56437714200

I. Ďuran

35276958000

M. Dimitrova

57204812825

P. Bilková

6507913287

R. Roccella

24605613100

A. Casolari

56333470800

C. Castaldo

6701415113

M. Hron

6701340372

J. Čaloud

57348337400

J. Gerardin

54583562800

M. Berta

14051575000

T. Markovic

55416188900

A. Devitre

57193123793

M. Komm

24528760100

O. Grover

55415674300

E. Macúšová

6505887722

V. Yanovskiy

55595543100

F. J. Artola

57195291718

S. Atikukke

57219539188

P. Hacek

53982955200

None Fuková

57203286068

E. Gauthier

7007178221

M. Jirsa

7102497973

P. Junek

55775769100

E. Matveeva

57200116867

D. Cipciar

57222297867

J. Mlynar

6603814421

D. Naydenkova

26031087800

J. Matějíček

6701754946

K. Kovarik

55542935800

I. Mysiura

47061681100

F. Napoli

57206300367

J. K. Park

24759204100

M. Poradzinski

36919056600

J. Preinhaelter

55948612500

P. Kulhánek

57032499600

M. Lehnen

9941238300

N. Lemoine

26428258400

G. Mazzitelli

57219739331

D. Šesták

26031106400

M. Rabinski

6602117536

A. Marin Roldan

57217223859

X. Litaudon

7003729827

Y. Q. Liu

7410216497

J. Adamek

57210674651

J. Horacek

35198167600

D. Tskhakaya

35231641900

A. Prishvitsin

57220753336

R. Pánek

7006809441

P. Barton

57200379907

P. Mácha

57204923367

R. Dejarnac

16232731600

F. Brochard

7004211037

J. Havlicek

25633536900

A. Havranek

57194563292

J. Čečrdle

58257791800

J. Čeřovský

57194563343

C. Hidalgo

7102797616

P. Lourenco

57216202758

K. Hromasová

57221384126

O. Hronova

25634317500

M. Iafrati

57193137918

N. Isernia

57204918715

R. Pitts

7006336049

S. Entler

56463002900

M. Farník

14059738800

H. Fernandes

7005418232

G. Grenfell

56741544300

Y. Gribov

6603794972

M. Grof

57206197081

L. Kripner

56313528500

T. Loarer

7004084056

A. Loarte

7006182961

N. C. Logan

35783451500

L. Krlín

6601961401

P. Böhm

7005031773

J. Cavalier

55350945800

O. Ficker

57199143940

M. Imrišek

55416317700

F. Jaulmes

56382420100

M. Jeřáb

6504625878

D. Réfy

55415564100

J. Krbec

56695066900

O. Bogár

56429709500

S. Lukes

57220751655

P. Pavlo

6701837789

A. Bencze

8640809800

J. P. Gunn

55554394000

D. Fridrich

57193758919