Neutron Telescopes, Neutrons & Sawteeth Transp User Course 2014 Jim Conboy.

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Neutron Telescopes, Neutrons & Sawteeth Transp User Course 2014 Jim Conboy

Neutron Telescopes 24/11/14Transp Neutrons … 2/11 KNL3 – 10 Horizontal and 9 Vertical Collimated Neutron Telescopes (from “Prediction/modelling of the neutron emission from JET discharges” June 2001)

Neutron Rates 24/11/14Transp Neutrons … 3/11 Shot – used for Neutron Rate calibration Measured Neutron rates & NEPAM prediction Transp Neutron Rate prediction – Total, B-Plasma,Thermal, B-B

Neutron Rates 24/11/14Transp Neutrons … 4/11 Shot – used for Neutron Rate calibration Measured Neutron rates & NEPAM prediction Transp predictions (- - ) for Total neutrons & telescope sums – All, Horizontal, Vertical

Sawtooth Models 24/11/14Transp Neutrons … 5/11 Including a sawtooth model in Transp might reduce the total neutron rate, by mixing hot ions from the plasma core with lower energy ions at larger radius ? Kadomtsev model: Runs J03,J04. Neutron spike follows 1 st sawtooth time in both cases. Not quite physical ?

Sawtooth – Kad. model 24/11/14Transp Neutrons … 6/11 Plasma profiles before (red) & after the 1 st sawtooth; Q(0) > 1. is the KM constraint; T e (0) is halved

Sawtooth – Kad. & Por. models 24/11/14Transp Neutrons … 7/11 Plasma axis variables, J05 (Kad.) & J06 (Por).; ‘Island width’ parameter 0.5 no change to total neutrons – except the unphysical spikee

Telescope profiles 24/11/14Transp Neutrons … 8/11 Telescope Profiles for data & J06 (Porcelli, Fp=0.5), averaged over 5 timepoints.

Telescope ‘Centrality’: 24/11/14Transp Neutrons … 9/11 Statistics on individual telescopes are challenging, so define ‘Centrality’ C x = Peak/All, for vertical, horizontal & all T/s :- (Can be calculated in jetdsp – form cumulative integral over telescope axis)

Centrality & Sawteeth 24/11/14Transp Neutrons … 10/11  The data is more central than any Transp run, both at and between the sawteeth  Transp shows some sawtooth structure, even if no sawtooth model is invoked (run J02)  The Kadomtsev model gives a sawtooth behaviour of comparable magnitude to the data  The Porcelli model produces smaller sawtooth, and is not very sensitive to the island size parameter (F p ).  All Transp runs give a similar telescope profile between sawteeth ‘Centrality’ for all telescopes

Conclusions 24/11/14Transp Neutrons … 11/11  Total Neutron flux predictions remain a problem  Neutron Telescope rates are reproduced quite well  Neither Sawtooth model helps the Neutron predictions (between sawteeth)  Kadomtsev model reproduces the telescope ratios better, but introduces artifacts in the total neutron distribution  Porcelli model doesn’t reproduce the telescope ratios as well as Kadomtsev ( Based on a limited number of runs, on a single shot. Altering other settings may improve the results )