US DEPARTMENT OF ENERGY DOE UC DAVIS
DEPARTMENT OF APPLIED SCIENCE
Fluctuation assessment through FIReTIP, MIR and high-k scattering systems
(UC Davis)
K.C. Lee, C. W. Domier and N.C. Luhmann, Jr.,
University of California at Davis
H. K. Park, E. Mazzucato, D. Smith S. Kaye, and C. Phillips
PPPL, Princeton University
diagnostics FY09-13 Planning meetingFebruary 27, 2007
US DEPARTMENT OF ENERGY DOE UC DAVIS
DEPARTMENT OF APPLIED SCIENCE
Monitoring system for density fluctuations on NSTX (MHD, turbulence, RF driven, Li ex.)
Global monitoring system (FIReTIP) FIReTIP system is capable of monitoring density turbulence, global MHD modes,
EM/ES waves from HHFW and Li experiments (including ELMs, ITG, TAE) 5~6 channels covers a half of the torus (entire flux space) Current time resolution is limited by (~500 kHz) and the proposal for higher rate
up to ~1MHz is on pending
Local monitoring with High-k scattering system High-k scattering system is capable of monitoring an extremely low level density
fluctuation (addressing TEM, ETG modes) Mode converted ES waves and nth IBW through nonlinear interaction at the edge Time resolution is also limited to ~700 kHz (Digitizer limit)
*details for each topics; NSTX dragNdrop directories/ presented by H. Park
Edge (Jan,31), MHD (Feb. 9), Wave (Feb. 13), T&T (Feb. 19)
US DEPARTMENT OF ENERGY DOE UC DAVIS
DEPARTMENT OF APPLIED SCIENCE
Geometry of FIReTIP and High-k scattering system
Inboard ρ = 0.05k┴ρe up to 0.7
Outboard ρ = 0.75k┴ρe up to 0.4
k= a/2 ~1.0 cm-1
kr >4 cm-1
ne/ne < 0.01 Ch4 is operating
US DEPARTMENT OF ENERGY DOE UC DAVIS
DEPARTMENT OF APPLIED SCIENCE
Modification of detection systems for HHFW driven fluctuations
Power Divider
I-Q Demodulators
Tran
sient
Dig
itize
rs
Sig1
DC Breaks
Video Amplifiers
800-1000 MHz BP Filters
I
I
I
Q
Q
Q18 dB Amplifiers
Ref.
Sig4
Sig5
Sig2 I
Q
Sig3 I
Q
• Five regular mixers at ~880 MHz• Output will be mixed with another five mixers with ~30MHz RF frequency
High-k scattering systemFIReTIP system
FIReTIP IF signal is at ~7 MHz
Tapped up-shifted signals at 23 MHz will be mixed with the reference FIReTIP signals and outcome is signals centered at ~30MHz
FIReTIP signals at ~30MHz will be mixed with RF reference signals ~30MHz
US DEPARTMENT OF ENERGY DOE UC DAVIS
DEPARTMENT OF APPLIED SCIENCE
Poloidal High-k measurement on NSTX
► Choice of probe beam source – CH3OH(119 μm) or CD3OD (185 μm)► Power level ~ 1W, (Ps ~ λ2)► kθ up to ~50 cm-1
► Minimum impact on the port and in vessel work
US DEPARTMENT OF ENERGY DOE UC DAVIS
DEPARTMENT OF APPLIED SCIENCE
MIR system on NSTX ► Presented by E. Mazzucato at T&T meeting (Feb. 19)
► UC Davis collaborations provide optics and detector array
1-D
2-D
Elliptical Lens
Antenna array
Planar Antenna Array
IF electronics detection moduleMM-wave Phased Array Antenna
Liquid Crystal (LC) Phase Shifter
US DEPARTMENT OF ENERGY DOE UC DAVIS
DEPARTMENT OF APPLIED SCIENCE
Gyrocenter shift by charge exchange reaction => major source of Er formation [2006 APS invited]
)1(2 rn
nqT
rp
nqEv
Bnnm
J n
ni
ii
iii
niiGCSr
Measurement/calculation of neutral profile on NSTX: Dα , Dβ , edge TS ?Future diagnostic work
► required spatial resolution ~ 2 mm. [K.C. Lee et al., RSI (2006)]
