A pulsed supersonic gas jet target for precision spectroscopy at the HITRAP facility at GSI

Tiedemann, D.; Stiebing, K. E.; Winters, D.; Quint, W.; Varentsov, V.; Warczak, A.; Malarz, A.; Stöhlker, Th.

doi:10.1016/j.nima.2014.08.017

Cited by 7 publications

(13 citation statements)

References 6 publications

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“…the estimate yields perfect efficiency of constructive interference, as expected. Figure 5B shows the phase matching efficiency for varying positions of the gas jet after the focus, with a jet diameter of j = 0.95 mm [43].…”

Section: Macroscopic Propagationmentioning

confidence: 99%

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Disentangling Long Trajectory Contributions in Two-Colour High Harmonic Generation

2018

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This work investigates High Harmonic Generation (HHG) in gas targets, induced by intense two-colour driving fields. We compared classical trajectory Monte Carlo simulations based on a semiclassical model of strong field tunnel ionisation of helium to experimental HHG spectra, and investigated the relative contribution of long trajectories to low harmonic orders. This phenomenon can be found even when the experimental setup is chosen to suppress long trajectories and favour phase matching for short trajectories.

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Section: Macroscopic Propagationmentioning

confidence: 99%

“…where Γ(t i , p i ) is the ionisation probability at time t i with initial transverse momentum p i . For the following calculations, the jet centre is assumed to be located at z = 5 mm, with a jet diameter of j = 0.95 mm [43]. Figure 6 contrasts two displacement gate plots.…”

Section: Long Trajectories Contributionmentioning

confidence: 99%

Disentangling Long Trajectory Contributions in Two-Colour High Harmonic Generation

2018

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“…Descriptions of various internal gas jet target readers can be found, e.g., in reviews [15,16] and original works [17][18][19][20][21][22][23]. It is worth noting here that in order for the GSI UNILAC gas stripper upgraded in the described manner to work in the pulse mode with light gases (helium and hydrogen), a commercially available fast pulsed valve is connected to the entrance of the supersonic nozzle.…”

Section: Introductionmentioning

confidence: 99%

How Simply One Can Considerably Improve Performance of the Gas Stripper at the GSI UNILAC (Proposal)

Varentsov

2024

Preprint

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Here we propose a simple way in which one can considerably improve performance of the gas stripper setup at the GSI UNILAC. To do so, it will be enough to replace inside the main GSI stripper chamber the present nozzle and the short windowless storage gas cell (for pulsed gas-jet operation mode) by a simple conical diverging nozzle combined with a gas catcher tube placed on the axis of gas-jet at some distance downstream the nozzle exit. As a result, the background pressure in the main and differentially pumped adjacent vacuum chambers of the gas stripper at the GSI UNILAC will dramatically reduce, and it will make possible to achieve the required optimal thickness of gas targets. The pulsed gas stripper operation is simply realized by implementing a commercially available fast gas valve connected to the nozzle entrance. Moreover, the ion beam pulses repetition rate can be increased and it will allow for the considerably higher average intensity of the ion beams extracted from the GSI UNILAC. Performance of the proposed GSI UNILAC gas stripper modification we explored by means of detailed computer experiments, which give a realistic description of supersonic gas jets flowing out the nozzle into vacuum. Results of these computer experiments have presented and discussed.

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“…[43,44]). Based on our gas dynamic calculations, setups of gas-jet internal targets [49,50] have been created. These calculations are in a good agreement with measured parameters and structure of the supersonic gas jets, as well.…”

Section: Introductionmentioning

confidence: 99%

Proposal of a New Double-Nozzle Technique for In-Gas-Jet Laser Resonance Ionization Spectroscopy

Varentsov¹

2023

Preprint

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In this paper a new double-nozzle technique for in-gas-jet laser resonance ionization spectroscopy is proposed. The functionality of this new technique we explored by detailed gas dynamic and Monte Carlo atom-trajectory simulations, which results are presented and discussed. The results of similar computer simulations for JetRIS setup (as a typical representative of the conventional nowadays in-gas-jet technique) are presented and discussed as well. The direct comparison of calculation results for proposed new technique with the conventional one shows that the double-nozzle technique has many advantages compared with that one used in the JetRIS setup at GSI for future high-resolution laser spectroscopic study of heaviest elements. To fully implement the proposed new technique to all existing (or under construction) setups for in-gas-jet laser resonance ionization spectroscopy, it will be enough just replace the used their supersonic nozzle by the miniature double-nozzle device described in the paper.

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A pulsed supersonic gas jet target for precision spectroscopy at the HITRAP facility at GSI

Cited by 7 publications

References 6 publications

Disentangling Long Trajectory Contributions in Two-Colour High Harmonic Generation

Disentangling Long Trajectory Contributions in Two-Colour High Harmonic Generation

How Simply One Can Considerably Improve Performance of the Gas Stripper at the GSI UNILAC (Proposal)

Proposal of a New Double-Nozzle Technique for In-Gas-Jet Laser Resonance Ionization Spectroscopy

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