NSTXNSTX NSTX Lids July 6, 2010 1

NSTXNSTX Supported by

College W&MColorado Sch MinesColumbia UCompXGeneral AtomicsINELJohns Hopkins ULANLLLNLLodestarMITNova PhotonicsNew York UOld Dominion UORNLPPPLPSIPrinceton UPurdue USNLThink Tank, Inc.UC DavisUC IrvineUCLAUCSDU ColoradoU IllinoisU MarylandU RochesterU WashingtonU Wisconsin

NSTX UpgradeStructural upgrade

Lids assembly6

Coils Support Structures Culham Sci CtrU St. Andrews

York UChubu UFukui U

Hiroshima UHyogo UKyoto U

Kyushu UKyushu Tokai U

NIFSNiigata UU Tokyo

JAEAHebrew UIoffe Inst

RRC Kurchatov InstTRINITI

KBSIKAIST

POSTECHASIPP

ENEA, FrascatiCEA, Cadarache

IPP, JülichIPP, Garching

ASCR, Czech RepU Quebec

Danny Mangra

NSTXNSTX NSTX Lids July 6, 2010

Outer TF free-body-out of plane loads

• Applied forces: 23,000 or 28,000 or 41,000 lbs

• Reactions at aluminum blocks has moments or more equivalent reaction forces

• Similar free body is need for inner stack to lids interface

• 9000 lbs per bolt(36 total) is used

• Actual stress is larger due to in plane loads eg launch

NSTXNSTX NSTX Lids July 6, 2010

Plate .5” thick

• .5” thick plate ~700 lbs• 36000 lbs per teeth• Max stress >50,000 psi

NSTXNSTX NSTX Lids July 6, 2010

.5” lid

• Max deflection ~ .025”

NSTXNSTX NSTX Lids July 6, 2010

Inner g10 crown/ strength 38,000 psi cross

• Inner g10 crown• 18000 lbs per tooth• Max stress> 24000 psi• Design limit < 19000 psi• .25” Radius

NSTXNSTX NSTX Lids July 6, 2010

G10 inner crown deflection

• Max deflection ~ .026”

• Actual max flection is much larger

• 100” copper stem

NSTXNSTX NSTX Lids July 6, 2010

Crown to lid interface-teeth details

• Crown teeth need shaping

• Eg of standard teeth• involute

•Current design•Stress in g10> 30,000 psi•Multiplications from shaping•Or crushing of teeth

NSTXNSTX NSTX Lids July 6, 2010

Center stack thermal growth 9 mm

• .5” thk plate• Fixed at outer boundary

NSTXNSTX NSTX Lids July 6, 2010

Thermal growth 9 mm

• .5” thk• Max stress >

45000 psi• Add to torsional

stress

NSTXNSTX NSTX Lids July 6, 2010

Lower crown/inconel 5/8 ~ 16,000 lbs in shear or 27,000 lbs tension

• 18,000 lbs in shear per bolt

• 1000 lbs per bolt launch load

• Halo current 2000 lbs per bolt in shear

•18 x 5/8 bolt ~.3 sq in•18000 lbs in shear•Inconel allowable 90,000 psi in tension or ~54,000 psi in shear•Bolt ~ 60,000 psi in shear + bending etc•G10 bearing pressure

NSTXNSTX NSTX Lids July 6, 2010

Summary/using Pete’s force

• Current g11 /teeth design need much work in upper crown• Lower crown~18 bolts design negative margin• Insulation material need a strength ration>60,000 psi• .5” thk plate need work at teeth area• Torsion stress + thermal stress > 75000 psi with current

concept• Basically lots of increase scope to design

– G10 interface/teeth design to lid– Sst interface– Thermal concept– Crown to pedestal need work, 18 bolts need resizing

NSTXNSTX NSTX Lids July 6, 2010

Design

• Single crown radius of g10 teethremove tension between buss/flag

• Double crownremove margin from flex strap boltor add more insertremovable but no slippage