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Lens based Kinetic Inductance Detectors with Distributed Dual Polarised Absorbers for Far Infra-red Space-based Astronomy
Authors:
Shahab O. Dabironezare,
Giulia Conenna,
Daan Roos,
Dimitry Lamers,
Daniela Perez Capelo,
Hendrik M. Veen,
David J. Thoen,
Vishal Anvekar,
Stephen J. C. Yates,
Willem Jellema,
Robert Huiting,
Lorenza Ferrari,
Carole Tucker,
Sven L. van Berkel,
Peter K. Day,
Henry G. Leduc,
Charles M. Bradford,
Nuria Llombart,
Jochem J. A. Baselmans
Abstract:
Future space-based far infra-red astronomical observations require background limited detector sensitivities and scalable focal plane array solutions to realise their vast potential in observation speed. In this work, a focal plane array of lens absorber coupled Kinetic Inductance Detectors (KIDs) is proposed to fill this role. The figures of merit and design guidelines for the proposed detector c…
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Future space-based far infra-red astronomical observations require background limited detector sensitivities and scalable focal plane array solutions to realise their vast potential in observation speed. In this work, a focal plane array of lens absorber coupled Kinetic Inductance Detectors (KIDs) is proposed to fill this role. The figures of merit and design guidelines for the proposed detector concept are derived by employing a previously developed electromagnetic spectral modelling technique. Two designs operating at central frequencies of $6.98$ and $12$ THz are studied. A prototype array of the former is fabricated, and its performance is experimentally determined and validated. Specifically, the optical coupling of the detectors to incoherent distributed sources (i.e. normalised throughput) is quantified experimentally with good agreement with the estimations provided by the model. The coupling of the lens absorber prototypes to an incident plane wave, i.e. aperture efficiency, is also indirectly validated experimentally matching the expected value of $54\%$ averaged over two polarisation. The noise equivalent power of the KIDs are also measured with limiting value of $8\times10^{-20}$ $\mathrm{W/\sqrt{Hz}}$.
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Submitted 3 June, 2025;
originally announced June 2025.
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Intelligent Optimization and Machine Learning Algorithms for Structural Anomaly Detection using Seismic Signals
Authors:
Maximilian Trapp,
Can Bogoclu,
Tamara Nestorović,
Dirk Roos
Abstract:
The lack of anomaly detection methods during mechanized tunnelling can cause financial loss and deficits in drilling time. On-site excavation requires hard obstacles to be recognized prior to drilling in order to avoid damaging the tunnel boring machine and to adjust the propagation velocity. The efficiency of the structural anomaly detection can be increased with intelligent optimization techniqu…
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The lack of anomaly detection methods during mechanized tunnelling can cause financial loss and deficits in drilling time. On-site excavation requires hard obstacles to be recognized prior to drilling in order to avoid damaging the tunnel boring machine and to adjust the propagation velocity. The efficiency of the structural anomaly detection can be increased with intelligent optimization techniques and machine learning. In this research, the anomaly in a simple structure is detected by comparing the experimental measurements of the structural vibrations with numerical simulations using parameter estimation methods.
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Submitted 18 January, 2024;
originally announced January 2024.
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Local Latin Hypercube Refinement for Multi-objective Design Uncertainty Optimization
Authors:
Can Bogoclu,
Dirk Roos,
Tamara Nestorović
Abstract:
Optimizing the reliability and the robustness of a design is important but often unaffordable due to high sample requirements. Surrogate models based on statistical and machine learning methods are used to increase the sample efficiency. However, for higher dimensional or multi-modal systems, surrogate models may also require a large amount of samples to achieve good results. We propose a sequenti…
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Optimizing the reliability and the robustness of a design is important but often unaffordable due to high sample requirements. Surrogate models based on statistical and machine learning methods are used to increase the sample efficiency. However, for higher dimensional or multi-modal systems, surrogate models may also require a large amount of samples to achieve good results. We propose a sequential sampling strategy for the surrogate based solution of multi-objective reliability based robust design optimization problems. Proposed local Latin hypercube refinement (LoLHR) strategy is model-agnostic and can be combined with any surrogate model because there is no free lunch but possibly a budget one. The proposed method is compared to stationary sampling as well as other proposed strategies from the literature. Gaussian process and support vector regression are both used as surrogate models. Empirical evidence is presented, showing that LoLHR achieves on average better results compared to other surrogate based strategies on the tested examples.
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Submitted 5 May, 2022; v1 submitted 19 August, 2021;
originally announced August 2021.
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Status report of the ESCULAP project at Orsay: External injection of low energy electrons in a Plasma
Authors:
Elsa Baynard,
Christelle Bruni,
Kevin Cassou,
Vincent Chaumat,
Nicolas Delerue,
Julien Demailly,
Denis Douillet,
Noureddine El Kamchi,
David Garzella,
Olivier Guilbaud,
Stephane Jenzer,
Sophie Kazamias,
Viacheslav Kubytskyi,
Pierre Lepercq,
Bruno Lucas,
Gilles Maynard,
Olivier Neveu,
Moana Pittman,
Rui Prazeres,
Harsh Purwar,
David Ros,
Cynthia Vallerand,
Ke Wang
Abstract:
The ESCULAP project aims at studying external injection of low energy (\SI{10}{MeV}) electrons in a plasma in the quasilinear regime. This facility will use the photo injector PHIL and the high power laser LASERIX. We will give a status report of the preliminary work on the facility and the status of the two machines. We will also present the results of simulations showing the expected performance…
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The ESCULAP project aims at studying external injection of low energy (\SI{10}{MeV}) electrons in a plasma in the quasilinear regime. This facility will use the photo injector PHIL and the high power laser LASERIX. We will give a status report of the preliminary work on the facility and the status of the two machines. We will also present the results of simulations showing the expected performances of the facility.
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Submitted 5 March, 2018; v1 submitted 26 February, 2018;
originally announced February 2018.
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Modelling of laser-plasma acceleration of relativistic electrons in the frame of ESCULAP project
Authors:
E. Baynard,
C. Bruni,
K. Cassou,
V. Chaumat,
N. Delerue,
J. Demailly,
D. Douillet,
N. El Kamchi,
D. Garzella,
O. Guilbaud,
S. Jenzer,
S. Kazamias,
V. Kubytskyi,
P. Lepercq,
B. Lucas,
G. Maynard,
O. Neveu,
M. Pittman,
R. Prazeres,
H. Purwar,
D. Ros,
K. Wang
Abstract:
We present numerical simulations results on the injection and acceleration of a 10 MeV, 10 pC electrons beam in a plasma wave generated in a gas cell by a 2J, 45 fs laser beam. This modeling is related to the ESCULAP project in which the electrons accelerated by the PHIL photo-injector is injected in a gas cell irradiated by the laser beam of the LASERIX system. Extensive modeling of the experimen…
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We present numerical simulations results on the injection and acceleration of a 10 MeV, 10 pC electrons beam in a plasma wave generated in a gas cell by a 2J, 45 fs laser beam. This modeling is related to the ESCULAP project in which the electrons accelerated by the PHIL photo-injector is injected in a gas cell irradiated by the laser beam of the LASERIX system. Extensive modeling of the experiment was performed in order to determine optimal parameters of the laser plasma configurations. This was done with the newly developed numerical code WakeTraj . We propose a configuration that benefits of a highly compressed electron bunch and for which the injected electron beam can be efficiently coupled to the plasma wave and accelerated up to 140 MeV, with an energy spread lower than 5%.
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Submitted 14 February, 2018;
originally announced February 2018.
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Longitudinal compression and transverse matching of electron bunch for external injection LPWA at ESCULAP
Authors:
K. Wang,
E. Baynard,
C. Bruni,
K. Cassou,
V. Chaumat,
N. Delerue,
J. Demailly,
D. Douillet,
N. El. Kamchi,
D. Garzella,
O. Guilbaud,
S. Jenzer,
S. Kazamias,
V. Kubytskyi,
P. Lepercq,
B. Lucas,
G. Maynard,
O. Neveu,
M. Pittman,
R. Prazeres,
H. Purwar,
D. Ros
Abstract:
We present theoretical and numerical studies of longitudinal compression and transverse matching of electron bunch before injecting into the Laser-plasma Wake Field Accelerator (LWFA) foreseen at the ESCULAP project in ORSAY. Longitudinal compression is performed with a dogleg chicane, the chicane is designed based on theory of beam optics, beam dynamics in dogleg is studied with ImpactT and cross…
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We present theoretical and numerical studies of longitudinal compression and transverse matching of electron bunch before injecting into the Laser-plasma Wake Field Accelerator (LWFA) foreseen at the ESCULAP project in ORSAY. Longitudinal compression is performed with a dogleg chicane, the chicane is designed based on theory of beam optics, beam dynamics in dogleg is studied with ImpactT and cross checked with CSRtrack, both 3D space charge (SC) and coherent synchrotron radiation (CSR) effects are included. Simulation results show that the energy chirp at the dogleg entrance should be smaller than the nominal optic design value, in order to compensate the negative energy chirp increase caused by longitudinal SC, while CSR can be ignored in our case. With an optimized configuration, the electron bunch ($\sim$10MeV, 10pC) is compressed from 0.9ps RMS to 70fs RMS (53fs FWHM), with a peak current of 152A. Transverse matching is realized with a doublet and a triplet, they are matched with Madx and the electron bunch is tracked with ImpactT, simulation results show little difference with the nominal design values, that is due to the SC effect. Finally, by simply adjusting the quadrupole strength, a preliminary optimized configuration has been achieved, that matches the Courant-Snyder (C-S) parameters to $α_{x}=0.01$,$α_{y}=-0.02$, $β_{x}=0.014$m,$β_{y}=0.012$m at the plasma entrance.
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Submitted 5 December, 2017;
originally announced December 2017.
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Technical Design Report EuroGammaS proposal for the ELI-NP Gamma beam System
Authors:
O. Adriani,
S. Albergo,
D. Alesini,
M. Anania,
D. Angal-Kalinin,
P. Antici,
A. Bacci,
R. Bedogni,
M. Bellaveglia,
C. Biscari,
N. Bliss,
R. Boni,
M. Boscolo,
F. Broggi,
P. Cardarelli,
K. Cassou,
M. Castellano,
L. Catani,
I. Chaikovska,
E. Chiadroni,
R. Chiche,
A. Cianchi,
J. Clarke,
A. Clozza,
M. Coppola
, et al. (84 additional authors not shown)
Abstract:
The machine described in this document is an advanced Source of up to 20 MeV Gamma Rays based on Compton back-scattering, i.e. collision of an intense high power laser beam and a high brightness electron beam with maximum kinetic energy of about 720 MeV. Fully equipped with collimation and characterization systems, in order to generate, form and fully measure the physical characteristics of the pr…
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The machine described in this document is an advanced Source of up to 20 MeV Gamma Rays based on Compton back-scattering, i.e. collision of an intense high power laser beam and a high brightness electron beam with maximum kinetic energy of about 720 MeV. Fully equipped with collimation and characterization systems, in order to generate, form and fully measure the physical characteristics of the produced Gamma Ray beam. The quality, i.e. phase space density, of the two colliding beams will be such that the emitted Gamma ray beam is characterized by energy tunability, spectral density, bandwidth, polarization, divergence and brilliance compatible with the requested performances of the ELI-NP user facility, to be built in Romania as the Nuclear Physics oriented Pillar of the European Extreme Light Infrastructure. This document illustrates the Technical Design finally produced by the EuroGammaS Collaboration, after a thorough investigation of the machine expected performances within the constraints imposed by the ELI-NP tender for the Gamma Beam System (ELI-NP-GBS), in terms of available budget, deadlines for machine completion and performance achievement, compatibility with lay-out and characteristics of the planned civil engineering.
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Submitted 14 July, 2014;
originally announced July 2014.