Timing and triggering of the Thomson scattering diagnostics on the COMPASS tokamak

Mikulin, O.; Hron, M.; Böhm, P.; Naylor, G.; Bílková, P.; Janky, F.; Salasek, J.; Pánek, R.

doi:10.1016/j.fusengdes.2014.03.031

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…A central triggering unit was designed and built for the TS system [12]. It synchronises the lasers in respect of each other, controls their operation during the experiment, triggers the fast DAQ, creates time stamps in the central tokamak DAQ to pair the time axis of TS and tokamak and synchronises the TS timing to tokamak t = 0.…”

Section: Overview Of the Thomson Scattering Diagnostic On The Compass...mentioning

confidence: 99%

“…The electronics of the old lasers did not limit the external triggering. To keep the laser operation with the external triggering safe, the repetition rate had to be carefully controlled by the triggering unit itself [12]. The new lasers have an internal control mechanisms in the digital controller, which does not allow to deviate from the nominal repetition frequency by more than 10%.…”

Section: Jinst 13 C01024mentioning

confidence: 99%

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High resolution Thomson scattering on the COMPASS tokamak—extending edge plasma view and increasing repetition rate

et al. 2018

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The Thomson scattering (TS) diagnostic system on the COMPASS tokamak consists of separate collection optics for core and edge plasmas. Till now, the adverse orientation of the viewport available for the edge TS limited the investigated plasma scenarios to those, where H-mode plasma pedestal was possible to be observed. The vacuum vessel port has been recently modified and directed more to the plasma edge. To bridge the time for designing and manufacturing a new lens, the so far used edge TS collection lens was tilted and the fibre bundles rearranged to comply with the new geometry. However, the full potential of the new port is utilized only by the newly designed and manufactured lens. Comparison of performance of the collection lenses before and after the viewport modification is presented. Apart from the edge collection system upgrade, the laser system was extended by two lasers with parameters similar to the original two, thus increasing the repetition rate of the TS system to 120 Hz or allowing to obtain four profiles with tight timing in order to measure fast transient events in the plasma.

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Section: Overview Of the Thomson Scattering Diagnostic On The Compass...mentioning

confidence: 99%

Section: Jinst 13 C01024mentioning

confidence: 99%

High resolution Thomson scattering on the COMPASS tokamak—extending edge plasma view and increasing repetition rate

et al. 2018

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“…The lasers may be fired in rapid bursts to achieve a high temporal resolution over eight points separated down to the microsecond level [25]. On the COMPASS tokamak, two 1.5 J 30 Hz Nd:YAG lasers [15] controlled by a smart triggering unit [26] are used. This flexible system allows to choose a regime compatible with experiment needs.…”

Section: Improving Time Resolutionmentioning

confidence: 99%

Scaling Thomson scattering to big machines

et al. 2016

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“…A new triggering unit for the TS system has been developed and constructed recently. 8,9 It is based on FPGA Xilinx Spartan 6, 10 replacing its predecessor based on Microchip dsPIC microprocessor. 11 The triggering unit provides synchronisation of the two lasers, with choice of 30 Hz double energy regime (both lasers firing simultaneously), 60 Hz or arbitrary time delay between the two lasers.…”

Section: Triggering Unitmentioning

confidence: 99%

Edge Thomson scattering diagnostic on COMPASS tokamak: Installation, calibration, operation, improvements

Böhm

Aftanas

Bílková

et al. 2014

Review of Scientific Instruments

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The core Thomson scattering diagnostic (TS) on the COMPASS tokamak was put in operation and reported earlier. Implementation of edge TS, with spatial resolution along the laser beam up to ∼1/100 of the tokamak minor radius, is presented now. The procedure for spatial calibration and alignment of both core and edge systems is described. Several further upgrades of the TS system, like a triggering unit and piezo motor driven vacuum window shutter, are introduced as well. The edge TS system, together with the core TS, is now in routine operation and provides electron temperature and density profiles.

show abstract

Timing and triggering of the Thomson scattering diagnostics on the COMPASS tokamak

Cited by 5 publications

References 5 publications

High resolution Thomson scattering on the COMPASS tokamak—extending edge plasma view and increasing repetition rate

High resolution Thomson scattering on the COMPASS tokamak—extending edge plasma view and increasing repetition rate

Scaling Thomson scattering to big machines

Edge Thomson scattering diagnostic on COMPASS tokamak: Installation, calibration, operation, improvements

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