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Soft X-Ray Diagnostic System for HT-7 and EAST Tokamaks
LIQUN HU
HT-7 ASIPP
Physical features of the diagnostic
• A chord-integrated measurement—point measurement, high
resolution in space and high temporal response in time to the
variations happened inside of the plasma.
• The intensity distribution and evolution and tomography of
SXR radiation-------information on the plasma structure, MHD
instability, sawtooth instability, phenomena occurring during
major disruptions, heat pulse propagation transport et al.
HT-7 ASIPP
ISXR Ne, Te, Zeff
Vertical array with 37 detectors of SBDs
Horizontal array with 37 detectors of SBDs
Slot-aperture with a movable slider covered with Be foils
Au-Si detector
Au-Si detector
SXR Array Diagnostic Features in HT-7
HT-7 ASIPP
Arc-shape SS pedestal with R=55cm (H) and R=60cm (V)
Two multi-channel arrays, 37 detectors of rectangular Au-Si SBDswith active area of 320 mm2, a pinhole camera likeSensitive energy region:
0.5-1.5keV Spatial resolution: 1.5cmTime resolution: 5sThe outmost chord: 27cm
Thin slot-apertures :
520 mm2 (V)
425 mm2 (H)
A different adjustable mechanism for 4 thicknessof Beryllium absorption foils : 5~6m, 12~13m, 25m, and full open
SXR Array Diagnostic with SBDs in HT-7
HT-7 ASIPP
Plug-in electronics and fast connectors for convenient repairing of the system
Schematic drawing of electronics and data acquisition
HT-7 ASIPP
DifferentialCircuit
VAX3300 Computer
CAMAC
Output DC
Regulator Rejecter
Power supply ~220V
Au-Si detector
Signal current transform to Voltage
Voltage preamplifier with variable gain
Sawtooth Heat Pulse Propagation
for e
Modification of HT-7 SXR detector
HAMAMATSU: S4114-46N/35N
Low terminal capacitor and high speed Down: 0.510mm slit, 1.6cm~0.7cmBelow: 0.510mm slit, 1.6cm~0.7cmAbove: 1.010mm slit, 1.5cm~0.9cm
HT-7 ASIPP
11, each with 46 elements, 3 toroidal positions, 1-20keV, 1.0cm, cooling plate, adjustable mechanism for protection.
HT-7U SXR Pinhole Camera
HT-7 ASIPP