M Stamp, SEWG meeting, 23/3/07 1

02/07/2006Diagnostic Gas Valve - GIM14

Important features:

Single point gas injection, octant 5, in LBSRP – not toroidally uniform

Gas bottle in Torus Hall, with preset pressure (presently 1280mbar)

(Relatively) non-perturbing to the plasma

Viewed with a KS3 telescope.

M Stamp, SEWG meeting, 23/3/07 2

02/07/2006

Tile 3

Tile 1

Tile 4

Tile 5

Tile 6

Tile 8

(Tile 7 is hidden)

Octant 5 divertor floor (photos from UMVP)

19/11/2006

GIM14 – single nozzle

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IVIS l-o-s calibration

Telescope l-o-s

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Use of GIM14GIM14 is not a piezo valve!It is pneumatic, and has a slow time response

It is controlled by an ‘ON time’, and ‘OFF time’, and time windowMinimum 1.5s ON is recommended (even so, first cycle just pressurises the line)

Offline tests:

First pulse = no gas

Other pulses, longTime delays.

Gas request

Downstream pressure

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Use of GIM14 (plasma example)GIM14 is not a piezo valve!It is pneumatic, and has a slow time response

It is controlled by an ‘ON time’, and ‘OFF time’, and time windowMinimum 1.5s ON is recommended (even so, first cycle just pressurises the line)(1 sec in example below)

LID3 (2 fringe density increase)

Reservoir pressure

Opening Request

Survey spectometer data