- 9 - 9 th th Sep. Sep. 2009 - 2009 - Introduction Gas-Jet Simulations Experimental Setup Massimiliano Putignano Massimiliano Putignano Development of a Beam Profile Development of a Beam Profile Monitor Based on a Supersonic Monitor Based on a Supersonic Gas-Jet Curtain Gas-Jet Curtain GSI Talk, GSI Talk, Darmstadt Darmstadt Website: Website: www.quasar-group.org www.quasar-group.org Email: Email: massimiliano.putignano@quasar- massimiliano.putignano@quasar- group.org group.org
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- 9 th Sep. 2009 - Introduction Gas-Jet Simulations Experimental Setup Massimiliano Putignano Development of a Beam Profile Monitor Based on a Supersonic.
Introduction Gas-Jet Simulations Experimental Setup Massimiliano Putignano - 9 th Sep Slide 2/9 does it work? does it work? How
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State-of-the-artState-of-the-art• Detailed study of expansion structure• Assessment of the impact on jet parameters• Optimization of axis-symmetric jet for use as a
target.
All optimization studies performed for an axis-symmetric jet.
• IdentifyIdentify parametersparameters of interest to diagnostics.of interest to diagnostics.• Propose a Propose a novel nozzle-skimmer systemnovel nozzle-skimmer system..• Extend existing studiesExtend existing studies to planar jets.to planar jets.
M.Jugroot M.Jugroot et alet al: : Numerical investigation of Numerical investigation of interface region flows in mass spectrometers: interface region flows in mass spectrometers: neutral gas transportneutral gas transport – J. Phys. D: Applied – J. Phys. D: Applied Physics, vol. 37 (2004) pp 1289.Physics, vol. 37 (2004) pp 1289.
variables and observables do we choose?variables and observables do we choose?
-2 dB Attenuation
SSWW
SDSD
DisDistt.
– angle of skimmer aperture in the direction of curtain expansion; – angle of skimmer aperture in the direction perpendicular to curtain expansionSWSW – skimmer slit widthSDSD – skimmer depthDistDist – nozzle-skimmer distance
MMmaxmax – Maximum Mach NumberCMCMmax max – Coordinates maximum MMMmax70%max70% - Maximum M at 70% simulation domain distance from nozzleWW – Curtain width (at -2 dB attenuation); DD – Curtain depth (at -2dB attenuation);
• System can be optimized through nozzle-skimmer geometry.
• Slit nozzle (instead of circular nozzle)• Nozzle and skimmer slits have to be perpendicular• Shaping of the gas curtain is feasible.Actual value of quality ratio: W/D.
Decreases of a factor of 2-32-3 moving from Slit nozzle to Circular nozzle.Homogeneity of curtain: / =Nozzle-Skimmer system:
• Acknowledgements:– Kai-Uwe KühnelKai-Uwe Kühnel– Angela IntermiteAngela Intermite– Carsten P. WelschCarsten P. Welsch
• References:1.1. M.Putignano M.Putignano et alet al: : A Fast, Low Perturbation Ionization Beam Profile Monitor Based on a A Fast, Low Perturbation Ionization Beam Profile Monitor Based on a
Gas-jet Curtain for the Ultra Low Energy Storage RingGas-jet Curtain for the Ultra Low Energy Storage Ring - Hyperfine Interaction, accepted. - Hyperfine Interaction, accepted.2.2. M.Putignano M.Putignano et alet al: : Design of a nozzle-skimmer system for a low perturbation ionization Design of a nozzle-skimmer system for a low perturbation ionization
beam profile monitorbeam profile monitor – DIPAC09 Proceedings. – DIPAC09 Proceedings.3.3. M.Jugroot M.Jugroot et alet al: : Numerical investigation of interface region flows in mass spectrometers: Numerical investigation of interface region flows in mass spectrometers:
neutral gas transportneutral gas transport – J. Phys. D: Applied Physics, vol. 37 (2004) pp 1289. – J. Phys. D: Applied Physics, vol. 37 (2004) pp 1289.4.4. Y. Hashimoto Y. Hashimoto et alet al: : Oxygen gas-sheet beam profile monitor for the synchrotron and Oxygen gas-sheet beam profile monitor for the synchrotron and
storage ringstorage ring - Nucl. - Nucl. Instr. Meth. Phys. Res. A 527 (2004) 289.Instr. Meth. Phys. Res. A 527 (2004) 289.
Thank you for your attentionThank you for your attention