COMPASS tokamak

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COMPASS Tokamak
MW
Discharge duration0.5 s (pulsed)
Plasma current360 kA
History
Year(s) of operation1992–2002 (in UK)
2006–2021 (in CZ)
Links
WebsiteCOMPASS Tokamak
Other links
Front photograph of the COMPASS tokamak in Prague

COMPASS, short for Compact Assembly, is a compact

Culham Science Centre in 1989, upgraded in 1992, and operated until 2002. It was designed as a flexible research facility dedicated mostly to plasma physics studies in circular and D-shaped plasmas
.

When it was decommissioned at Culham, it was offered to the European Commission and found a new home at the Institute of Plasma Physics of the Czech Academy of Sciences in Prague where it began operations once again in 2006.[1][2][3][4] It officially ended its experimental runs on 20 August 2021 and will be disassembled to leave room for a new device, COMPASS-U.[5]

History

The first plasma in COMPASS was produced in 1989 in a C-shaped vacuum vessel, i.e., in a simpler vessel with a circular cross-section. Pioneering experiments followed, including for example the ITER-relevant tests of magnetic field correction with saddle coils for Resonant magnetic perturbations (RMP) experiments or experiments with non-inductive current drive in plasma.

The operation of tokamak was restarted with a D-shaped vacuum vessel in 1992. The operation mode with high plasma confinement (

Institut für Plasmaphysik in Garching
, Germany.

In 2002, British scientists started alternative research on larger, spherical tokamak MAST. Operation of COMPASS was discontinued due to insufficient resources for the operation of both tokamaks, however, the planned research program was not complete. The European Commission and UKAEA sent COMPASS to the Institute of Plasma Physics in Prague in the autumn of 2004. The machine restarted operations in 2006 and operated continually until its last "shot" on 20 August 2021. During its operational time in Prague, COMPASS carried out 21,000 experimental shots.

As of August 2021, plans are to dispose of COMPASS to make way for a significantly larger machine, COMPASS-U (for Upgrade).

COMPASS and COMPASS-U

Parameters Values[6] Values after planned upgrade in 2021[7]
Major radius R 0.56 m 0.84 m
Minor radius a 0.23 m 0.28 m
Plasma current Ip (max) 360 kA 2 MA
Magnetic field BT 0.9 T - 2.1 T 5 T
Vacuum pressure 1×10−6 Pa
Elongation 1.8
Plasma shape D, SND, elliptical, circular
Pulse length(max) ~ 0.5 s 5 s
Beam heating
PNBI
40 keV		 2 × 0.3 MW 4-5 MW

See also

References

  1. S2CID 53056977
    .
  2. doi:10.1016/j.fusengdes.2010.12.024
    .
  3. doi:10.1088/0741-3335/58/1/014015
    .
  4. ^ "Tokamak". www.ipp.cas.cz. Retrieved 2020-06-25.
  5. ^ "Curtain Call for the COMPASS Tokamak". ITER. 13 September 2021.
  6. ^ COMPASS on the Institute of Plasma Physics of CAS, archived from the original on 2018-01-12, retrieved 2018-05-28
  7. ^ "COMPASS Upgrade on the Institute of Plasma Physics of CAS".

External links

Wikimedia Commons has media related to COMPASS tokamak.

https://iopscience.iop.org/article/10.1088/0741-3335/58/1/014015

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