Alcator C-Mod 2007 Ideas Forum

Home Announcement Facility Capabilities Task Force Areas Submission of Ideas Forum Agenda Presenting Remotely Directions + Lodgings C-Mod Contacts Research Program Information Previous Ideas Forum (Dec. 2004)

Facility capabilities A short summary of the expected machine capabilities/parameters/diagnostics for the 2007 campaign follows. For more thorough information, please visit the C-Mod website or contact us. C-Mod Parameters BT from ~2T to 8T IP up to 2 MA central ne up to ~1x10^21 m^-3 Ti~Te up to ~5 keV elongation from 0.9 to 1.7 triangularity from ~0.3 to 0.75 single null (lower or upper), double null or limited configuration reversal of BT and IP direction possible for brief periods  New diagnostics and facility features to be implemented for the 2007 campaign: Cyropump in upper divertor for improved density control (~10kL/s pumping speed) Prototype tungsten lamellae tiles in divertor Surface science station for deposition studies Additional magnetic pick-up coils for low-n mode resolution Bolometry upgrades Improved inner wall scanning Langmuir probe high-field side flow measurement Prototype fast-ferrite tuner for real-time ICRF tuning 7° rotation of diagnostic neutral beam for improved MSE Dust injection and laser scattering detection Auxiliary Plasma Heating/Current Drive Capabilities: ICRH: routine forward power up to 5MW. Source freq. variable from 40 to 80MHz. Heating or current drive phasing. Lower Hybrid wave launcher with source power up to 3 MW Additional operating features Long-pulse diagnostic neutral beam (1.5 sec duration) External correction coils (A-coils) for non-axisymmetric field studies and locked mode amelioration Active MHD antennas Digital plasma control system for flexible real-time feedback Massive impurity gas jet for disruption mitigation studies Li/impurity pellet injection Impurity gas puff system Selected Diagnostics Standard magnetic diagnostics ne(r) via Thomson Scattering, interferometry, and visible bremsstrahlung, Te(r) via Thomson scattering and ECE CXRS measurements of Ti, toroidal and poloidal rotation Core toroidal rotation measurements via spectroscopy Core Ti profile measurements via spectroscopy Central Ti from neutron rate Impurity measurements via spectroscopy (x-ray, VUV, visible) Core and edge bolometry Density fluctuation measurements via phase contrast imaging, microwave reflectometry Edge and SOL profiles via reciprocating probes SOL fluctuation measurements via probes and light emission Hard x-ray pinhole camera for fast electron measurements Compact neutral particle analyzer