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

W. Bin

22233459600

K. Bogár

57702480100

P. Bilkova

6507913287

P. Bohm

7005031773

O. Bogár

56429709500

I. Borodkina

56768005800

E. Gauthier

7007178221

S. Brezinsek

6603110179

P. Buratti

7003485039

J. Čaloud

57348337400

None Fuková

57203286068

J. Gerardin

54583562800

K. Kovarik

55542935800

J. P. Gunn

55554394000

M. Jirsa

7102497973

P. Junek

55775769100

A. Kallenbach

8594928000

O. Kovanda

59090727000

M. Gobbin

16174869000

G. Grenfell

56741544300

Y. Gribov

6603794972

N. Lemoine

26428258400

X. Litaudon

7003729827

Y. Q. Liu

7410216497

I. Mysiura

47061681100

D. I. Naydenkova

26031087800

F. Napoli

57206300367

J. K. Park

24759204100

N. Patel

59806301800

P. Pavlo

6701837789

M. Poradzinski

36919056600

J. Preinhaelter

55948612500

A. Prishvitsin

57220753336

A. Podolnik

56437714200

D. Réfy

55415564100

R. A. Pitts

7006336049

R. Roccella

24605613100

N. C. Logan

35783451500

T. Loarer

7004084056

A. Loarte

7006182961

P. Lourenco

57216202758

A. Casolari

56333470800

J. Adámek

57210674651

J. Horacek

35198167600

O. Grover

55415674300

R. Dejarnac

16232731600

J. Cavalier

55350945800

O. Ficker

57199143940

M. Hron

6701340372

M. Komm

24528760100

E. Macúšová

6505887722

C. Castaldo

6701415113

J. Čečrdle

58257791800

J. Čeřovský

57194563343

E. Matveeva

57200116867

R. Pánek

7006809441

M. Peterka

36600986000

J. Seidl

35198965200

D. Cipciar

57222297867

S. Entler

56463002900

M. Farník

14059738800

H. Fernandes

7005418232

M. Dimitrova

57204812825

I. Ďuran

35276958000

D. Fridrich

57193758919

M. Grof

57206197081

L. Kripner

56313528500

A. Devitre

57193123793

L. Krlín

6601961401

P. Kulhánek

57032499600

M. Lehnen

9941238300

S. Lukes

57220751655

T. Markovic

55416188900

P. Mácha

57204923367

A. Marin Roldan

57217223859

M. Rabinski

6602117536

J. Matějíček

6701754946

J. Mlynar

6603814421

D. Sestak

26031106400

G. Mazzitelli

57219739331

P. Hacek

53982955200

J. Krbec

56695066900

F. Brochard

7004211037

M. Berta

14051575000

A. Bencze

8640809800

D. Tskhakaya

35231641900

V. Yanovskiy

55595543100

F. J. Artola

57195291718

S. Atikukke

57219539188

P. Barton

57200379907

J. Havlicek

25633536900

A. Havranek

57194563292

C. Hidalgo

7102797616

K. Hromasová

57221384126

O. Hronova

25634317500

M. Iafrati

57193137918

N. Isernia

57204918715

F. Jaulmes

56382420100

M. Imrišek

55416317700

M. Jeřáb

6504625878