alireza talebitaher, m.v. roshan, p. shutler,

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International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore Alireza TalebiTaher, M.V. Roshan, P. Shutler, R.S. Rawat, P. Lee, S.V. Springham Plasma Radiation Sources Laboratory (PRSL) Natural Science and Education (NSSE) National Institute of Education (NIE) Nanyang Technological University (NTU)

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Page 1: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Alireza TalebiTaher, M.V. Roshan, P. Shutler,

R.S. Rawat, P. Lee, S.V. Springham

Plasma Radiation Sources Laboratory (PRSL)

Natural Science and Education (NSSE)

National Institute of Education (NIE)

Nanyang Technological University (NTU)

Page 2: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Capacitance (C0) 28.8 F (0.6 F 48)

Charging voltage (max) 15 kV

Energy (E0) 3 kJ

Inductance of circuit (L0) 26 nH

Impedance (Z0) 30 m

Anode radius (α) 11.5 mm

Cathode radius (b) 32.0 mm

Repetition rate (max) 16 Hz

Max. current (at 12.5 kV) 410 kA

Operating Gas H2 , D2 , Ne , Ar

NX2 Plasma Focus Device

Page 3: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Breakdown Phase

Axial Acceleration Phase

Radial Phase

Ca

tho

de

Ca

tho

de

Anode

Insulator

High Voltage

Power Supply

(Charger)

Pseudo Spark

Gap Switch

28.8 μF / 15kV

soft x-ray, hard x-ray, ray, high energy

deuteron and electron and

fusion products:

D + D p (3Mev) + T (1Mev) 50%

D + D n (2.5Mev) + He (0.8Mev) 50%

Plasma Focus phases

Page 4: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

Motivation and Application

Plasma Focus Imaging by:

Conventional Camera

Shadowgraphy

X-Ray radiography

Fusion Source Imaging by Proton Tracking

Application:

Astronomy

Medical Radiography

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Page 5: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Aperture Imaging

Optical Imaging

Pinhole Imaging

Depth of Field

Chromatic Aberration

X-ray, -ray, particles

Little light or particle

bigger pinhole !

Coded Aperture Imaging…

Encoded Image

Decoded Image

Page 6: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Mask FabricationHAVAR alloy

Co, Fe, Cr, Ni, W, Mo, Mn and C

Micro-EDM

Mask pattern

2020 pixels

57 holes with 6.3% open area

Page 7: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Particle

Filter

Proton min.

energy (MeV)

Deuteron min.

energy (MeV)

Kapton (50μm) 1.8 2.3

Kapton (75μm) 2.3 3.0

Kapton (100μm) 2.7 3.6

3 MeV proton

residue energy

depth of proton

in CR-39

3 MeV deuteron

residue energy

depth of deuteron

in CR-39

Kapton

(50μm)2.1 67 1.5 25

Kapton

(75μm)1.6 41 0.05 0

Detector: CR-39 (PM355)

Chemical formula (C12H18O7)

Etching

Etchant chemistry (KOH, NaOH,…)

Molarity

Temperature

Etching Time

Page 8: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Radium-226 (5μCi – 24110 years – 4.87 to 5.6 MeV)

Experimental Setup with source

Page 9: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Experimental Result with source

1 point source 2 point source Rectangular source

Page 10: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Experimental Setup with PF

Camera 35 degree

90 degree0 degree

Page 11: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Experimental Result with PF

0 degree 35 degree90 degree

Page 12: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Coded Aperture Imaging works well for Fusion Source Imaging in Plasma Focus Device.

The Fusion Source in NX2 looks like a cylinder around the pinch.

For Extended source, we need a bigger mask and naturally bigger detector.

By mixing these results with proton and neutron anisotropy, we can reach to a better understanding about plasma fusion behavior in Plasma Focus device.

Conclusion!

Page 13: Alireza TalebiTaher, M.v. Roshan, P. Shutler,

International Workshop on Plasma Diagnostics and Application, 2-3July 2009, NIE, NTU, Singapore

Thank you

Q ? and A!