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