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The MICROLAS concept: precise thrust generation in the Micronewton range by laser ablation

Scharring, Stefan and Lorbeer, Raoul-Amadeus and Karg, Stephanie and Pastuschka, Lisa and Förster, Daniel Johannes and Eckel, Hans-Albert (2016) The MICROLAS concept: precise thrust generation in the Micronewton range by laser ablation. In: Technology for Small Satellite Research: Payloads and Subsystem Technologies Small Satellite Applications, Missions, and In-Orbit Experiences Small Satellites, 1 (6). International Academy of Astronautics. pp. 27-34. ISBN 978-2-917761-49-6.

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Abstract

Results from experimental work and hydrodynamic simulations on the MICROLAS concept for a pulsed laser-ablative microthruster without moving components are presented. The propellant surface is scanned and ablated by single high-intensity laser pulses yielding a fixed impulse bit in the nNs range. The variation of the laser pulse repetition rate over several orders of Magnitude allows access to various thrust levels. Laser-induced thrust of around 25 μN is generated for aluminum targets with laser pulses of 8 ns pulse length at a repetition rate of 1 kHz with an average laser power of 2.3 W. Thrust noise is around 1 µN/sqrt(Hz). A servo loop for laser operation is proposed in order to minimize thrust noise. Since increasing roughness of the propellant surface in long-term ablation might yield thrust noise, propellant targets are investigated by profilometric surface analysis after ablation by ultrashort laser pulses of 10 ps pulse length. Surface roughness after material removal in several layers is analyzed with respect to laser fluence and spot overlap. Simulation results for specific impulse, impulse coupling coefficient and jet efficiency are discussed with respect to laser parameters and target material.

Item URL in elib:https://elib.dlr.de/106310/
Document Type:Contribution to a Collection
Title:The MICROLAS concept: precise thrust generation in the Micronewton range by laser ablation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Scharring, Stefanstefan.scharring (at) dlr.deUNSPECIFIED
Lorbeer, Raoul-Amadeusraoul.lorbeer (at) dlr.deUNSPECIFIED
Karg, StephanieStephanie.Karg (at) dlr.deUNSPECIFIED
Pastuschka, Lisalisa.pastuschka (at) dlr.deUNSPECIFIED
Förster, Daniel Johannesdaniel.foerster (at) ifsw.uni-stuttgart.deUNSPECIFIED
Eckel, Hans-AlbertHans-Albert.Eckel (at) dlr.dehttps://orcid.org/0000-0002-4581-6375
Date:September 2016
Journal or Publication Title:Technology for Small Satellite Research: Payloads and Subsystem Technologies Small Satellite Applications, Missions, and In-Orbit Experiences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:1
Page Range:pp. 27-34
Editors:
EditorsEmailEditor's ORCID iD
Busch, StephanUNSPECIFIEDUNSPECIFIED
Schilling, KlausUNSPECIFIEDUNSPECIFIED
Publisher:International Academy of Astronautics
Series Name:Small Satellites
ISBN:978-2-917761-49-6
Status:Published
Keywords:Mikroantriebe, Laser Ablation, Schubrauschen, Laserantriebe, gepulste Laser, Oberflächenanalysen
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics > Studies and Concepts
Deposited By: Scharring, Stefan
Deposited On:06 Oct 2016 16:32
Last Modified:06 Oct 2016 16:32

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