C-Mod quarterly intro · engineering resources to deal with alternator and ... based on 3-d ALGOR...

C-Mod Quarterly ReviewFY2009 Q3

21 July 2009

Developing the steady state, high-Z wall,

high-field tokamak for ITER and beyond

FY09 Q3 Status and Plans

• Alternator Recertified (April, 2009)– Now in service and operating normally

• Disassembly, inspection, TF refurbishment complete– Also improved LN2 systems, vessel heaters, etc.

• Lower Hybrid Launcher– Delayed by combination of redeployment of

engineering resources to deal with alternator and unexpected technical issues

– Installation after end of FY09 campaign• Advanced ICRF antenna

– Aimed at strong reduction of RF sheath induced impurity generation

– Design progressing well, schedule can be accelerated with ARRA incremental funding

FY09 Q3 Status and Plans

• Successful Ideas Forum (April, 2009)– >130 presentations, including strong student,

collaborator and international participation– Follow-up planning and prioritization

• FY09 research campaign underway– Completed 1.2 research weeks (as of July 17) out of

planned 9 weeks total– Decreased emphasis on Advanced Scenarios; will

increase in FY10• ARRA increments will enable significant facility and

diagnostic enhancements, plus 6 additional research run weeks in FY10

MIT/PSFC Generator:Summary of re-certification process

DoE quarterly review2009/07/21

C-Mod’s generator rotor

Extensive inspections and materials tests were done by outside firms and by MIT PSFC

• WesDyne performed an independent NDE re-examination (ultrasound, bore inspection, eddy current)

• ReGENco and Structural Integrity Associates independently analyzed both GE and WesDyne inspection data sets

• Continental Field Services obtained internal ring samples from the bore transition region at each end of the rotor for materials tests

• The locations of all machining were smoothed and honed after samples were removed

• Extensive materials properties tests for both forging rings werecarried out according to ASTM specifications

• Chemistry (from bore chips)• Ultrasound imaging• Tensile tests• Fracture toughness tests• Cyclic fatigue crack growth tests• Microstructural and fractographic analysis

Bore Ring from the Collector End Transition Region

RotorCollector end ring sample

UIltrasound Images of the Bore Rings

Collector EndFlywheel End

Metals Testing Company, South Windsor, Connecticut

Locations of Samples from the Collector End Ring

Compact Tension (Fracture Toughness) and Crack Growth

sample locationsTensile sample locations

Samples, before and after testing

Tensile

Fracture Toughness

Crack Growth

1 inch

Testing carried out by Peter Stahle (Research Engineer, NSE) under supervision of Ron Ballinger

Microstructural and Fractographic AnalysisReveals No Evidence of In-Service Changes

200 μm• SEM and X-ray analyses carried out by Michael Short and Ron Ballinger

• Main conclusions:─ Microstructure observations

imply no change in rotor since forging

─ Chemistry control implemented correctly (sulphur bound with Mn)

─ Presence of oxides, decarburized layers and MnS precipitates implies voids formed during forging

─ Absence of cracks growing from existing voids suggests stresses well below limits

Typical microstructure and voids in a sample from the collector end bore ring

Crack Growth Rates more than a Factor of 10 Slowerthan “Conservative” Assumed Rates

Table 1. Results of 2009 bore sample materials testing Forging: Collector End Sample Test Results 0.2% Yield Ultimate Elong. Red. Area Temp.

(oC)CE-TS-A-1 Tensile 90.6 ksi 111.8 ksi 13.0 % 30.3% 60 CE-TS-A-2 Tensile 88.6 ksi 111.8 ksi 10.8% 39.4% 60 CE-TS-B-4 Tensile 79.9 ksi 99.6 ksi 4.8% 4.3% 64 CE-TS-B-5 Tensile 84.7 ksi 103.1 ksi 7.4% 10.1% 64

K_Jq [ksi*sqrt(inch)] CE-CT-1* Fract. Tough. 69.5 64 CE-CT-2 Fract. Tough. 79.6 64 CE-CT-3 Fract. Tough. 80.6 64

Paris Fit (inch/cycle) Max K CE-CG-A-1, 2 Crack Growth da/dn=5.7e-10* K^2.80 50.4 22 Forging: Flywheel End Sample Test Results 0.2% Yield Ultimate Elong. Red. Area Temp.

(oC)FE-TS-A-3 Tensile 72.2 ksi 96.9 ksi 64 FE-TS-A-5 Tensile 100.0 ksi 132.4 ksi 15.6% 36.4% 64 FE-TS-A-6 Tensile 73.7 ksi 98.6 ksi 64

K_Jq [ksi*sqrt(inch)] FE-CT-1 Fract. Tough. 118.2 64 FE-CT-3 Fract. Tough. 135.1 64

Paris Fit (inch/cycle) Max K FE-CG-A-1, 2 Crack Growth da/dn=3.7e-11* K^3.65 50.0 22

* Dimensions of CE-CT -1 did not conform to the ASTM specifications, and the sample had a curved back; K value has been increased by 8%, based on 3-d ALGOR simulations

Structural Integrity Associates recommendations:Rotor is fit for service with significant safety factors

ReGENco Recommendations:Rotor can continue to run in service as-is.

Summary

• All materials tests have shown that the rotor steel has good properties, well beyond those used in the conservative assumptions of industry specialists

• Two independent outside expert analyses have certified that the rotor is fit for continued safe service

Considering the rotor alone, operation for at least 12 calendar years before the next boresonic inspection is recommended

– Other components (bearings, for example) can require more frequent inspection; we will continue to observe industry standards and expert recommendations for inspection intervals

• A detailed report was prepared and presented to MIT Prof. C. Canizares (VP for Research & Associate provost) in a meeting on 2009/04/17. At the conclusion of that meeting, Prof. Canizares officially approved returning the generator to service.

Generator is back in operation

• Westinghouse reassembled the generator and performed high-voltage electrical tests and full-speed vibration tests (April – May). The generator passed all tests.

• The generator is now in regular operation at full performance for the 2009 C-Mod run campaign.

1

DoE Quarterly Review07/21/09

Status of Machine and Alternator

2

FY2009 Campaign History

• Initial Pumpdown on 6/10/2009• Bake and ECDC cleanup of vessel• First full cooldown and initial power testing on

6/18/2009• First plasma 6/24/2009• Completed 1.2 weeks of our 9 week 2009 campaign

(220 discharges) as of 7/17/2009• H/(H+D) is at the 10 to 20% level

– Efficient minority heating– Transmitters coming back online– Preparing for first boronization

3

Machine Status

• From 5/23/2008 to 6/10/2009 C-Mod was completely disassembled, inspected, and reassembled– All TF feltmetal was replaced– All connections, coaxes, cooling lines, and instrumentation were

inspected and refurbished– A great deal of in-vessel work done in support of new diagnostics

• Upgrades to Machine– Improvements to TF cooling

• Vertical leg cooling from one to two manifolds with separate control valves

• Improvements to instrumentation cabling• Improvements to inspection process of liquid nitrogen fittings• Shot cycle time clearly reduced

– Several more discharges/day– Less liquid nitrogen used

– Improvements to vessel heater system -- Thermocouple located in center of each heater for improved feedback control

– OH stack preload increased -- Changes to Belleville washer stack and OH support blocks reduces tension in stack

4

Alternator Status

• Alternator has been successfully returned to service and has provided primary power for C-Mod as needed

• No re-balancing of the rotor was required• Vibration levels are all well below industry standard

recommendations• We continue to improve instrumentation

– All vibration levels trended on PLC and stored in MDSPlus tree.

– Levels also recorded by data acquisition system during shot

– All critical temperatures and pressures now trended by PLC and also stored in tree

5

Diagnostic Status

• Diagnostics– Greatly improved edge diagnostics now operational in

support of FY2010 USDoE Joint Facilities Milestone

Conduct experiments on major fusion facilities to improve understanding of the heat transport in the tokamak scrape-off layer (SOL) plasma, strengthening the basis for projecting divertor conditions in ITER

• Scanning and embedded probes• Thermocouples in divertor and limiter tiles• Surface thermocouples• IR and visible cameras• Divertor bolometry• Emissive probes• Improved Spectroscopy

Spectroscopic Views of GH Limiter

Boron Coated Tilesand New Instrumentation

6

Status

• Diagnostics – MSE (PPPL/MIT)

• Worked to reduce shot-to-shot variation in MSE baseline data

• Design changes made to reduce temperature gradients across the collection optics lenses that result in stress induced birefringence

– Polarimetry• Full mock-up of a C-Mod polarimeter chord

being developed in the polarimeter lab• 3-Chord system to be installed before end of

current campaign• Upgrade number of chords with ARRA

funds for 2010 campaign

MSE Heat Shield

3-Chord Polarimeter

7

Plans

• Operation– 2009 campaign concludes end of September– Short up-to-air to install new lower hybrid launcher– First part of 2010 campaign through late spring

• Primary focus – operation of new launcher– Up-to-air to install new 4-strap ICRF antenna– Complete 2010 campaign

Lower Hybrid Launcher Status as of 07/21/2009

C-Mod Engineering Group

Status

• We had planned to install the launcher during the last up-to-air, however– Large amount of engineering effort went into

recertification of the alternator– Issues with cracking/vacuum leaks of stainless steel

waveguide components during e-beam welding as a result of the EDM process have added several more weeks of delay

– We now plan to install launcher in early October following 2009 run campaign

Status

Cracks in the steel near the weld at transformer

Vacuum leaks in the front waveguides in steel

Plasma facing guides and vacuum windows

• Leaks in front waveguides have been successfully repaired

• Testing underway for repair of waveguide at transformer

Status• Front waveguide assemblies have been welded onto nine

of sixteen 4-way splitters, and they have been successfully leakchecked

• Four 4-way splitters have front waveguide assemblies aligned and tacked in place and are ready for welding

• Three 4-way splitters are waiting to be brazed and butt- welded– 9 forward waveguide assemblies ready for brazing– 3 forward waveguide assemblies ready for welding

• Copper WR187 waveguides have been prepared for installation

• Brazing of WR-187 waveguides to the transformers will be done in-house using our induction heater

Status

Welding of the Aluminum Frame complete this week

Welding of the Bellows Box Assembly begins this week

New Rails with the Rail Carriage Blocks are ready for installation

All Waveguides

in-housePort extensionComplete and Installed in vessel

Manufacture of Rear Attachment plate has begun in-house

16 Rear Waveguides ready for installation

Gaskets annealed and cleaned.

Support Structure manufactured and in-house.

Support Box Tubes manufactured

Support plates for dummy wave-guide at welderAll other support plates in-house

Support bearings complete

Probes & probe supportPlates complete & in-house

(Not shown)

Plans

• Complete launcher assembly– Leakcheck all vacuum components– Power test all high power components before assembly

• Bake and leakcheck assembled launcher in test chamber• Prepare waveguide runs to launcher

– Launcher fed by 10 klystrons– 4 central 4-way splitters run at full available klystron power

(allows power handling limits of launcher to be tested)– 12 remaining 4-way splitters fed by remaining 6 klystrons

(following 3db splitter) • Launcher ready for installation 9/09

Present design

4-way splitterSS/copper plated

transformer

Copper C101Diffusion brazeSS-to-Cu

SS wave-guide

EBW butt joint

Present transformer

Modified transformer

Status of C-Mod 4-Strap ICRF Antenna

July 21, 2009 MIT PSFC, Cambridge MA 02139

S.J. Wukitch, W.K. Beck, M. Garret, P. Koert, Y. Lin, N.P. Mucic

General Requirements for New Antenna

Design is to be based upon the modified J antenna while targeting performance 25% higher in voltage than D and E antennas.• Reduce boronization erosion and impurity production.Reduce boronization erosion and impurity production.• Improve voltage and power handling.

Antenna general specifications:g p• Operate at 2 MW (down from 3 MW) and 50 kV,• Have pulse length up to 5 seconds at repetition time of 1800 s,• Have thermal loads at plasma limiter of 12 MW/m2 with a 3 mm scrape-

off length,• Withstand a disruption load of 1 T/msec at 9 T, • Utilize single horizontal port, and

H 50 80 MH• Have 50-80 MHz range.

Reliability is a critical issue.Antenna assembly in-vessel needs to be efficient.Diagnostics should be built into the design from the outset.

Proposed ICRF Antenna

Proposed ICRF 4-Strap Antenna

All dimensions in cm Proposed

F ll li i 91 0Full limiter 91.0

Antenna limiter 91.3

F d d 91 7Faraday rod 91.7

Clearance between rod and strap

0.7

Feedthrus are 5” diameter (present are 4.5”).Power density at 2 MW (3MW) is 9 8 MW/m2 (14 8 MW/m2)

Strap Face radius 93.45

Power density at 2 MW (3MW) is 9.8 MW/m2 (14.8 MW/m2)Strip line impedance is 30 Ω (J is 50 Ω and D/E is 30 Ω)Screen is aligned to B-field and is 50% transparent (same as J)Peak nφ = 14 (0,π,0,π); 11 (0,π,π,0); and 8 (0,π/2,π,3π/2) in vacuum

spectrum (bit higher than J antenna).

Summary of Design Progress

Conceptual Design review held at MIT December 19, 2008.• Dave Rasmussen, Phil Ryan, and Rick Goulding (ORNL); Bob Pinsker

(GA); and Randy Wilson (PPPL).( ); y ( )Order has been placed for 5” feedthrus.Folded strap geometry has been decided.

• Similar in shape as J antenna but a bit shorterSimilar in shape as J antenna but a bit shorter.Impact of rotation on E|| fields has been investigated.

• Used lossy dielectric to model plasma load.• Have begun cold plasma modeling with artificial plasma loading toHave begun cold plasma modeling with artificial plasma loading to

investigate validity of lossy dielectric model.Detailed RF modeling to reduce areas of high electric field.

• Completed modeling of coax to strip line transition.p g p• Antenna strap connection and bridge section are yet to be completed.

Manufacturing of material testing device is underway.• Test high strength, high melting temperature materials against copper to g g , g g p g pp

investigate if significant voltage handling can be realized.

Antenna ⊥ Total B-field Reduces Integrated E||

Reduce coupled E|| by making antenna symmetric along a field line.

• Modeled antenna with lossy• Modeled antenna with lossydielectric.

• For 10° rotation, reduction at the strap ends is ~10 and at the midplane ~30midplane ~30.

For comparison, impurity production from [0,π] is significantly improved compared to [0,0].p p [ ]

Integrated E|| is reduced by factor of 2-3.

P t l h llPresents several challenges.• Geometry is more complex.• Geometry decreases the area available to couple by ~25%.• Forced us to confront helical geometry and associated complexities. g y p• Assembly is greatly complicated.

RF Analysis Summary

Peak nφ = 14 (0,π,0,π); 11 (0,π,π,0); and 8 (0,π/2,π,3π/2) in vacuum spectrum.

Using lossy dielectric to approximate plasma loadUsing lossy dielectric to approximate plasma load.• Vacuum modeling has limited value.

» Current is low and difficult to assess importance of geometrical features.• Observe critical change in antenna currents and patterns with load, likely

to influence sheath formation.» Set load to be equivalent to observed J antenna Q.

• Investigated simple loop, folded and end fed center grounded strap configurationconfiguration.

» End-fed has clear advantage but limited access prevents utilization unless the number of straps is decreased to 2.

» Folded is more sensitive to load variations than end-fed but superior to simple loop.» Simple loop has largest reflection for all loads investigated.p p g g

• Plan to utilize COMSOL to investigate more realistic load conditions.Present antennas have highlighted regions where RF voltages are critical.

• Coax to strip line transition and bridge section of folded strap.p g pVacuum striplines are covered and connect at back of strap.

Replacing Cu with Material X to Improve Voltage Handling

DC breakdown studies show significantly higher breakdown field with refractory metals. 700

800900

A. Descoeudres et al., Proc. EPAC08.

Breakdown models suggest a four step process with differing trigger mechanisms.

• Mechanical breakup model – (J. Norem).» Fatigue can play significant role 300

400500600700]

m/V

M[E b» Fatigue can play significant role.

» External B field can

• Material melting model - (P. Wilson).» Gas trapped at grain boundaries play important

role. 0100200300

C W Vpc rZ u C oM

iTlA aT b rC Su

Identified vendor, Plasma Processes, that can VPS Mo and plate W onto Inconel 625.

C W VcdG

ZuC

OFH

C C

CW M TA T bN C SuC

dth

Local test of materials and surface preparations will begin in August/September.• Utilize ridge wave guide transmission cavity to provide high electric field (100

MV/m).• Evaluate solid and film materials• Evaluate solid and film materials.

Summary

Design will be based upon the modified J antenna with the antenna rotated 10º such that the entire antenna structure is perpendicular to total magnetic field.

A iAntenna is to:• Operate at 2 MW (down from 3 MW) and 50 kV,• Have pulse length up to 5 seconds at repetition time of 1800 s,• Have thermal loads at plasma limiter of 12 MW/m2 with a 3 mm scrape-off length,

i h d di i l d f /• Withstand a disruption load of 1 T/msec at 9 T, • Utilize single horizontal port, and • Have 50-80 MHz range.

Impurity production is addressed by rotating antenna and enforcing symmetry along a 10º field line.

• Reduce E|| by factors of 10-30.• Results in 25% increase in power density for given power.Results in 25% increase in power density for given power.• Raises the peak in the toroidal vacuum spectrum

Utilize larger feedthrus, shortest vacuum transmission lines, and Mo or W instead of copper to achieve higher voltage and power handlingof copper to achieve higher voltage and power handling.

• Material tests are planned to begin in August/September.

Many Challenges for Antenna Performance

Many experiments request fault free, maximum power and minimum impurity production. 2

4 PRF (MW)

BT=5.4 T, IP=1 MA 10504260226

impurity production.Reduce boronization erosion and

impurity production.Load tolerance and robust coupling

0.1

0.2

0.3WMHD (MJ)

4 T 0 (keV)Load tolerance and robust coupling.• Utilize FFTs

Voltage and power handling.• Where E||B <10 kV/cm

2

3

4

Te0 (keV)

ne (x1020 m-3)

• Where E||B, <10 kV/cm.• Maximized size of feedthrus.• Utilize high strength, high melting

temperature material instead of

2

1

2 Rneut (x1014 s-1)

pcopper.

Antenna conditioning requirements. • Shorter vacuum transmission lines. 0.6 0.8 1 1.2 1.4

1

2

3PRad (MW)

Time (s)

Reducing ICRF Impurity Production

Underlying cause of impurity generation is thought to be generation of E||.

Insulating limiters did not eliminate RF

H-mode

L-mode

H-mode with

150

V]

Insulating limiters did not eliminate RF sheaths.

Simulations suggest E|| is generated by• Radial strip line generating unwanted

BN tiles100

ma

Po

ten

tial

[V

120015

• Radial strip line generating unwanted fields and

• Misalignment of current strap with total magnetic field.

50

Pla

sm

000516014-20, 22, 1031

1

∼P1/2

Proposed solution:• Rotate straps and antenna structure to

be perpendicular to total magnetic field.

1.51.00.50RF Power [MW]

1

• Ensure symmetry along total field line within near field of antenna.

Alcator C-Mod 2009 Ideas Forum

Jerry Hughes

OFES C-Mod Quarterly ReviewJuly 21, 2009

Hughes, “Alcator C-Mod 2009 Ideas Forum” OFES C-Mod Quarterly Review Slide 2 of ?

2009 Alcator C-Mod Ideas Forum

• What it is: An open, relatively informal, forum for presenting new experimental proposals (ideas), held every 1—2 years.

• Ideas Forum for FY09/10 was held April 6—8, 2009– Contributions from collaborators actively sought– Meeting was broadcast for remote participation

• Speakers were allowed 5 minutes per presentation (+2 for questions) – Motivation and Goals of proposal– General plan of execution (MP-level details not required)


Many valuable proposals were generated by this meeting • Final tally = 137

– Comparable to previous IF– Proportion of ideas submitted

under each topic also similar• Contributions from

collaborators: 27%– up from FY07 – Domestic, international

contributions– ITER Organization

• 28% of submissions were from students

• Proposals were organized into sessions (mostly) according to theme, and tagged with their author-identified topics

DD, Ops, Basic Sci.,

12

MHD, 9

Adv. Scenarios,

10

ICRF, 10

LH, 12Transport,

38

Divertor + Edge, 28

H-mode Scenarios,

18


Proposals were submitted under a long-standing topical categorization

Task Force Area (Primary Area, Alternate) Coordinator

Diagnostic Development (11, 4)

Basic Science (1, 0)

Operations (0, 2)Jim Irby

Transport (38, 15) Martin Greenwald

MHD (9, 0) Bob Granetz

Divertor/Edge (28, 5) Brian LaBombard

ICRF (10, 5) Yijun Lin

Lower Hybrid (12, 2) Randy Wilson (PPPL)

H-mode Baseline Integrated Scenarios (18, 7) Steve Wolfe

Advanced Integrated Scenarios (10, 3) Amanda Hubbard


Follow-up process has refined plans for run campaign

• April/May: Task Forces evaluated proposals to define priorities

– New Ideas presented– Ideas presented at previous Fora– Existing mini-proposals

• Combination and compromise to optimize machine usage, based on run-time guidance:– 9 weeks in FY09 – 13 weeks in FY10

• Initially focused on FY09• Task force leaders called open

meetings for discussions• Optional sub-topical meetings

useful for larger groups

Optional “sub-topical” groups:(e.g. rotation, ITBs)

Topical and thrust groups

(e.g. Transport)

Initial run-time allocations

Prioritization + consolidation of similar proposals

Ideas Forum

to the EPC



• Cross-cutting program themes of strong interest received added attention, coordination:

• H-mode pedestal physics• Improved L-mode operation• Divertor heat flux diagnosis



Ideas Forum

to the EPC



• Outcome of follow-up planning includes a research plan for FY09 experimental campaign (more in Martin’s talk)

• High priority proposals are being expanded into mini-proposals

• Current and new MPs will drive schedule during the current and following run campaigns

• Experimental Program Committee meets frequently to review and approve new proposals



Ideas Forum

to the EPC


Ideas Forum information, presentations will remain online indefinitely

2009 and previous IFs all found under “Research Program Information” link

http://www.psfc.mit.edu/research/alcator/program/ideas2009/



C-Mod Research Plan – Quarterly Review 7/21/2009

Alcator C-Mod Near-Term Research Plans

C-Mod Quarterly Review

7/21/2009

Presented by M. Greenwald


Initial Run Allocations for 2009

Topical Area Run Days

H-mode Scenarios 5

Advanced Scenarios 2

Operations and Diagnostic Development

3

Divertor/Edge 8

ICRF 4

MHD 3

Transport 11

Total 36


• Operations

– Characterize and correct error fields after reassembly

– Low Bt start-up

• Diagnostic commissioning

– Polarimeter

– New MSE w/ thermal shielding

Verifying magnetic reconstructions w/ constrained EFIT

– New heat-flux and divertor diagnostics

– New impurity injector

– etc.

Operations and Diagnostic Development


• Driven by ITER urgent needs

• “Pre-Nuclear” Scenarios

– L-H threshold, confinement, ELMs in H, He

• H-mode access – power requirement for good confinement

• ITER Scenario Demonstrations

– Ramp-up, ramp-down, dimensionless scaling

Themes – H-mode Scenarios


• Current profile and transport modification via LHCD

– Hybrid regimes – flat shear

– Advanced regimes – reversed shear

– Longer pulse development

• Two-frequency ICRF ITB work

• Low Bt start-up

• Mostly deferred to FY2010 due to LHCD & calendar constraints

Themes – Advanced Scenarios


• Heat-flux footprint (joint 2010 milestone)

– Interplay of parallel and perpendicular transport, atomic physics

– Supported by major diagnostic upgrades

– Initial data coming in

• SOL turbulence

– New 2D array for GPI supplements probes, fast cameras, etc.

• Hydrogen retention (joint 2009 milestone)

– (C-Mod experiments mostly complete)

• Physics of RF sheaths and impurity sources (w ICRF group)

Themes – Edge/Divertor


• RF sheaths and impurity sources

– New instrumentation (Katsumata, emissive probes)

– New boron coated tiles to mitigate impurity effects

• ICRF flow drive (via mode converted waves)

– Optimize driven rotation

– Understand mechanisms

• RF scenarios and fast-ion physics

– Broaden operating range and validate models

Themes – ICRF


• Commissioning of new launcher

• LHCD density limit

– Characterize scaling and mechanisms

– Comparison of L and H-modes

• Fast electron transport

• LHCD into enhanced L-modes

• Deferred to FY2010

Themes – Lower Hybrid


• Rotation and momentum transport

– ICRF flow drive – optimization and effects on transport

– Mechanisms for self-driven rotation and momentum transport

• Particle transport

– Quantitative comparisons w/simulation

– Impurity injection – new hardware

• Pedestals and L-H transition

– Turbulence and shear flows near transition

– Pedestal widths, gradient and underlying physics, scaling

• Enhanced L-mode – physics and optimization

Themes – Transport


• Disruption related

– Runaway electron physics and disruptions

(Most require LHCD – deferred)

– Runaways in non-disruptive discharges

– 3D radiation distribution during gas-jet mitigated disruptions

• Fast particle modes

– RSAE tunneling

• Non-resonant rotation breaking – β dependence

Themes – MHD

ARRA Supplemental Proposal – FY09-10

C-Mod Quarterly ReviewFY2009 Q3

21 July 2009

Developing the steady state, high-Z wall,

high-field tokamak for ITER and beyond

ARRA “Stimulus” Funding Proposal

• Enhance Facility Operations– Increase by 6 research weeks in FY10– Currently only about 1/3 of priority research

accommodated within guidance run-time• Facility Enhancements and Upgrades

– Speed implementation of advanced ICRF antenna, testing sheath reduction

– Complete Fast-Ferrite ICRF tuners for real-time matching (add 3 systems to existing 1)

– Upgrade to 4 MW total microwave source power for LHCD

• Addition of 7 new klystrons• Completion of 4’th control cart

– Upgrades to DNB power systems• Reduced power requirements• Improved reliability/availability

ARRA “Stimulus” Funding Proposal

• Diagnostic upgrades– Polarimeter upgrades to increase spatial resolution

• Along with MSE, provides current density profile measurements

• Also has application to magnetic field fluctuations

– New divertor spectrometer diagnostic to monitor Mo and W sources• Particularly important for ICRF induced sheath

studies

ARRA Proposal Budgets

• Research Runtime: $935k• ICRF antennas: $1130k• FFT real-time matching: $940k• Klystron microwave sources (LH): $1450k• 4th cart and control upgrades for LH: $810k• Polarimeter upgrade: $150k• Divertor spectrometer: $50k

• Total $5895k

C-Mod quarterly intro · engineering resources to deal with alternator and ... based on 3-d ALGOR...

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Transcript of C-Mod quarterly intro · engineering resources to deal with alternator and ... based on 3-d ALGOR...