SourceLAB SmartShot: Supersonic gas-jet target (v2017)

Wave-free supersonic pulsed gas jet system The wave-free supersonic pulsed gas jet system SMARTSHOTTM is developed as a gas target for laser-plasma interaction studies such as laser-plasma acceleration, X-ray lasers, laser-plasma X-ray sources, etc. It can be used for the experimental studies which require the production of very localized high-density gas target with high repetition rate in vacuum. Catalog no.6-b 2 Density distribution of the gas jet 1. Wave-free supersonic slit nozzle (MS series) 2. High-speed solenoid valve (A2-6 series) 3. Fast pulsed valve driver (LX-03R) (A2-6275-FL + MS05-10-120-1405) (LX-03R) Characteristics of the system The system uses a special slit nozzle to produce localized uniform gas jet in tiny region. It is designed by aerodynamic method and manufactured by micro-machining *. The system uses a valve which can eject high-pressure gas (up to 7(10) MPa) through an orifice with large diameter. Accordingly, this can allow to use the slit nozzle with larger throat size and higher Mach number. The valve can be operated with high-speed opening and closing (100-200μs) by proper driving pulse control. The valve can open fully and provide a stable ejection pressure even under the condition of regulation pressure of 10MPa **. By the current output monitor signal from the LX-03R the gas jet operation can be precisely synchronized with laser pulses or signals from another devices. (In this case trigger pulse into LX-03R is required.) * It has been applied for a patent in JAPAN (No.2004-100878) ** The ejection gas pressure reduction due to stroke shortening of an armature inside the solenoid valve can not occur even in high-pressure range at 10MPa. (we recommend up to 7MPa for normal use.) 1. 2. 3. 4. Wave-free supersonic pulsed gas jet system Catalog no.6-b 3 High speed valve A2-6 series The interferogram image of the gas jet by the wave-free supersonic slit jet shows a contour density map. Nozzle Tip 1.26 mm X Y Cf. Ar-gas, Stagnation pressure:6MPa Wave-free slit nozzle, MS05-10-166 (Mach no.5, 1.2x10.0 mm for g=1.66) Example of supersonic gas jet injection into vacuum by the Wave-free slit nozzle. 1mm Example of sonic gas jet injection into vacuum by a conical nozzle. Ar-gas, Stagnation pressure:2MPa Density distribution of the gas jet (3D-plot) Flow X[mm] Y[mm] 0 0.5 1.0 1.5 0.0125 0.0250 0 10.0 15.0 5.0 0.0125 0.0250 Z Y X (0,0,0) Nozzle M= 5 Nozzle ρ ρ0 ρ ρ0 As shown in the interferogram image, the wave free nozzle can produce a supersonic laminar flow with sharp boundary between gas jet and Vacuum. In contrast to sonic injection, an uniform density distribution is formed inside triangular area at the exit of the nozzle*. (See red region in 3D-plot.) * Reference J. D. Anderson, Jr, Modern Compressible Flow with Historical Perspective 2nd Edition, (Mc Graw Hill,1989) Catalog no.6-b 4 Time response of the gas jet Typical time response of the solenoid valve. (He 10MPa, A2-6304) Fast mode operation 10 Hz operation Gas Pressure @Exit (Sensor signal) Drive current of the valve Voltage pulse of the valve Stable gas injection Fast open & close Controlled by ositive & negative pulses Optimum pulse shape for high-speed motion. Normal operation Maximum pressure 10MPa High-speed open&Close ~200μs Flat top ~1.8ms (for Helium) Rep. rate maximum 10Hz Wavefree supersonic nozzle MS series We can design the nozzle based on your requirements, such as density and species of gas, target size (L x W), Mach number of the flow, available gas pressure etc. (a) He (b) N2 Me= 5 Nozzle 1021 1020 1019 1018 1017 1016 0 10 20 30 40 50 60 70 80 Pressure[atm] Density[cm-3] Sample; Stagnant pressure vs. Density @ exit of the nozzle Mach number = 5 (a) for helium gas (b) for N2 gas Supersonic gas flow Divergent portion Throat (120µm x 10 mm) Reservoir Nozzle tip Side plate Gas inlet Convergent portion x y z 1.23mm 5.0mm Sample Pictures (MS05-10-166) Wave-free supersonic pulsed gas jet system Catalog no.6-b 5 High speed valve A2-6 series > Valve Type A2-6443 > Orifice (D) [mm] φ1.5 > Operation Range [MPa] 0.01-7(10) > Remarks low leakage (Soft poppet) > Gas temperature -10 - 40℃ (No freeze) Specification Input Voltage ................................................................................................... 85 - 264V (AC) Drive voltage ................................................................................................ 40 - 180V (Pulse) Pulse duration for excitation ................................................................................... 0.1-9.9ms Pulse duration for negative voltage ...................................................................... 0.1-10.1ms Maximum Drive current ................................................................................................... 35A 1) LX-03R Fast Solenoid Valve Driver Out-let Aperture size ............................................................................................... D=1.5 mm Maximum working pressure .......................................................................................... 7MPa Internal leakage ..................................................................................... Less than 10 cm3/min External leakage .................................................................... Less than 1.33*10-6Pa*m3/s He Voltage ...................................................................... DC48V for driving armature (7~10 ms), DC12V for keeping armature position (0~10 ms) Gas Connection ........................................................................................... 1/4 inch Swagelok Repetition .............................................................................................................. 10Hz (Max) 2) A2-6443 Fast Solenoid Valve Nozzle Wall ........................................................ designed by the Method of Characteristics Exit slit size .......................................................................................................... (1.2x XXmm) Throat width .................................................................................. 120 micron with slit shape Pulse duration for negative voltage ...................................................................... 0.1-10.1ms Mach Number at Exit of nozzle .......................................................... ~5 (for Helium, Argon) 3) MS05-XX-166 Wave-free slit nozzles 3-1-30, Nishiki, Naka-ku, Nagoya TEL 052-205-9711 URL: www.japanlaser.co.jp FAX 052-205-9713 E-Mail: [email protected] Selling agency