Ten-microsecond pulsed molecular beam source and a fast ionization detector

Gentry, W. Ronald; Giese, Clayton F.

doi:10.1063/1.1135470

Cited by 284 publications

(62 citation statements)

References 13 publications

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“…Pioneering work by Gentry and Giese [7] demonstrated an elegant, tuning fork valve mechanism that produced $10 s pulses of He molecular beams, with water cooling of the valve body. Corat et al [8] later demonstrated a different electromagnetic actuator in which a static coil repels a metallic flyer plate.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetically driven, fast opening and closing gas jet valve

Krishnan

Elliott

Geddes

et al. 2011

Phys. Rev. ST Accel. Beams

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The design and performance are presented of an electromagnetically driven gas valve [M. Krishnan, J. Wright, and T. Ma, Proceedings of the 13th Advanced Accelerator Concepts Workshop, Santa Cruz, CA, AIP Conf. Proc. No. 1086 (AIP, New York, 2008] that opens in <100 s, closes in <500 s, and can operate at pressures of $1000 psia to drive supersonic nozzles. Such a valve has applications to laserplasma accelerators, where the fast opening and closing would allow sharper edges to the flow and also allow higher rep-rate operation without loading the vacuum chamber. The valve action is effected by a flyer plate accelerated by the electromagnetic impulse of a low inductance, spiral wound, strip-line coil driven by a capacitor. Gas flows out of the valve when the seal between this flyer plate and the valve seat is broken. The electromagnetic force greatly exceeds the restoring forces provided by a spring and the gas pressure against the valve seat. Piezoresistive sensor and laser interferometer measurements of flow show that the valve opens in $100 s for all pressures up to 800 psia. The closing time is 500 s, set by the spring constant and mass. The prototype valve has been operated with helium at 0.5 Hz and at 500 psia for $1 hour at a time with no cooling.

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Section: Introductionmentioning

confidence: 99%

Electromagnetically driven, fast opening and closing gas jet valve

Krishnan

Elliott

Geddes

et al. 2011

Phys. Rev. ST Accel. Beams

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“…Many designs of pulsed beam sources are based on various actuating mechanisms (mechanical [6], Lorenz force [7][8][9], Piezo driver [10,11], or electromagnetic [12][13][14][15][16][17]). Several years ago we introduced a shaped nozzle, which combined with a high pressure fast-acting pulsed valve enabled us to reach high beam intensities and lower jet temperatures than what was previously available [18,19].…”

Section: Introductionmentioning

confidence: 99%

Pulsed Supersonic Beams from High Pressure Source: Simulation Results and Experimental Measurements

Even

2014

Advances in Chemistry

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Pulsed beams, originating from a high pressure, fast acting valve equipped with a shaped nozzle, can now be generated at high repetition rates and with moderate vacuum pumping speeds. The high intensity beams are discussed, together with the skimmer requirements that must be met in order to propagate the skimmed beams in a high-vacuum environment without significant disruption of the beam or substantial increases in beam temperature.

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“…The translational degrees of freedom are cooled, as are the internal degrees of freedom of the molecules. While the first beams were continuous, the method was later extended by using pulsed valves with short opening times [43,44]. The individual pulses could then be made very intense, without the gas load becoming excessive.…”

Section: Beams Of Cold Polar Radicalsmentioning

confidence: 99%