1
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Varmazyar P, Singh PK, Elekes Z, Halasz Z, Nagy B, Son JG, Csontos J, Mohacsi A, Nelissen K, Somoskői T, Szabo RE, Toth S, Ter-Avetisyan S, Osvay K. Calibration of micro-channel plate detector in a Thomson spectrometer for protons and carbon ions with energies below 1 MeV. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:073301. [PMID: 35922328 DOI: 10.1063/5.0086747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 06/15/2022] [Indexed: 06/15/2023]
Abstract
The calibration of an ion detection system was carried out for protons and carbon ions from a few tens of keV up to about 1 MeV energies. A Thomson spectrometer deflecting the particle beam accelerated from a laser plasma creates the ion spectra on a phosphor screen behind a micro-channel plate (MCP), which are recorded by a camera. During calibration, the ion spectra simultaneously hit the slotted CR-39 track detector installed in front of the MCP and, passing through the adjacent CR-39 stripes, the MCP. The calibration provides the ratio of the interpolated values between two consecutive stripes of the camera signal and the total number of particles recorded on the corresponding stripe of CR-39. The efficiency of proton detection by CR-39 was also measured in a conventional accelerator beam and found to drop by 20% below 100 keV.
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Affiliation(s)
- Parvin Varmazyar
- National Laser-Initiated Transmutation Laboratory, University of Szeged, 6720 Szeged, Hungary
| | - Prashant K Singh
- National Laser-Initiated Transmutation Laboratory, University of Szeged, 6720 Szeged, Hungary
| | - Zoltan Elekes
- Institute for Nuclear Research, 4026 Debrecen, Hungary
| | - Zoltan Halasz
- Institute for Nuclear Research, 4026 Debrecen, Hungary
| | - Bence Nagy
- National Laser-Initiated Transmutation Laboratory, University of Szeged, 6720 Szeged, Hungary
| | - Joon-Gon Son
- National Laser-Initiated Transmutation Laboratory, University of Szeged, 6720 Szeged, Hungary
| | - Janos Csontos
- ELI-ALPS Research Institute, ELI-HU Non-Profit Ltd., 6728 Szeged, Hungary
| | - Arpad Mohacsi
- National Laser-Initiated Transmutation Laboratory, University of Szeged, 6720 Szeged, Hungary
| | - Kwinten Nelissen
- ELI-ALPS Research Institute, ELI-HU Non-Profit Ltd., 6728 Szeged, Hungary
| | - Tamas Somoskői
- ELI-ALPS Research Institute, ELI-HU Non-Profit Ltd., 6728 Szeged, Hungary
| | - Rita E Szabo
- ELI-ALPS Research Institute, ELI-HU Non-Profit Ltd., 6728 Szeged, Hungary
| | - Szabolcs Toth
- ELI-ALPS Research Institute, ELI-HU Non-Profit Ltd., 6728 Szeged, Hungary
| | - Sargis Ter-Avetisyan
- National Laser-Initiated Transmutation Laboratory, University of Szeged, 6720 Szeged, Hungary
| | - Karoly Osvay
- National Laser-Initiated Transmutation Laboratory, University of Szeged, 6720 Szeged, Hungary
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2
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Malko S, Cayzac W, Ospina-Bohórquez V, Bhutwala K, Bailly-Grandvaux M, McGuffey C, Fedosejevs R, Vaisseau X, Tauschwitz A, Apiñaniz JI, De Luis Blanco D, Gatti G, Huault M, Hernandez JAP, Hu SX, White AJ, Collins LA, Nichols K, Neumayer P, Faussurier G, Vorberger J, Prestopino G, Verona C, Santos JJ, Batani D, Beg FN, Roso L, Volpe L. Proton stopping measurements at low velocity in warm dense carbon. Nat Commun 2022; 13:2893. [PMID: 35610200 PMCID: PMC9130286 DOI: 10.1038/s41467-022-30472-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 04/29/2022] [Indexed: 11/25/2022] Open
Abstract
Ion stopping in warm dense matter is a process of fundamental importance for the understanding of the properties of dense plasmas, the realization and the interpretation of experiments involving ion-beam-heated warm dense matter samples, and for inertial confinement fusion research. The theoretical description of the ion stopping power in warm dense matter is difficult notably due to electron coupling and degeneracy, and measurements are still largely missing. In particular, the low-velocity stopping range, that features the largest modelling uncertainties, remains virtually unexplored. Here, we report proton energy-loss measurements in warm dense plasma at unprecedented low projectile velocities. Our energy-loss data, combined with a precise target characterization based on plasma-emission measurements using two independent spectroscopy diagnostics, demonstrate a significant deviation of the stopping power from classical models in this regime. In particular, we show that our results are in closest agreement with recent first-principles simulations based on time-dependent density functional theory. Charged particle interaction and energy dissipation in plasma is fundamentally interesting. Here the authors study proton stopping in laser-produced plasma for the moderate to strong coupling with electrons.
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Affiliation(s)
- S Malko
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain. .,Princeton Plasma Physics Laboratory, 100 Stellarator Road, Princeton, NJ, 08536, USA.
| | - W Cayzac
- CEA, DAM, DIF, F-91297, Arpajon, France
| | - V Ospina-Bohórquez
- CEA, DAM, DIF, F-91297, Arpajon, France.,University of Bordeaux, CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, F-33405, Talence, France.,University of Salamanca, Salamanca, Spain
| | - K Bhutwala
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - M Bailly-Grandvaux
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - C McGuffey
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA.,General Atomics, San Diego, CA, 92121, USA
| | - R Fedosejevs
- University of Alberta, Department of Electrical and Computing Engineering. Edmonton, Alberta, T6G 2V4, Canada
| | | | - An Tauschwitz
- Goethe-Universität Frankfurt am Main, Max-von-Laue-Strasse 1, 60438, Frankfurt am Main, Germany
| | - J I Apiñaniz
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain
| | - D De Luis Blanco
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain
| | - G Gatti
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain
| | - M Huault
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain
| | - J A Perez Hernandez
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain
| | - S X Hu
- Laboratory for Laser Energetics, University of Rochester, 250 E. River Road, Rochester, NY, 14623, USA
| | - A J White
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - L A Collins
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - K Nichols
- Laboratory for Laser Energetics, University of Rochester, 250 E. River Road, Rochester, NY, 14623, USA.,Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - P Neumayer
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291, Darmstadt, Germany
| | - G Faussurier
- CEA, DAM, DIF, F-91297, Arpajon, France.,Université Paris-Saclay, CEA, LMCE, F-91680, Bruyères-le-Châtel, France
| | - J Vorberger
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - G Prestopino
- Dipartimento di Ingegneria Industriale, Universitá di Roma "Tor Vergata", Via del Politecnico 1, 00133, Roma, Italy
| | - C Verona
- Dipartimento di Ingegneria Industriale, Universitá di Roma "Tor Vergata", Via del Politecnico 1, 00133, Roma, Italy
| | - J J Santos
- University of Bordeaux, CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, F-33405, Talence, France
| | - D Batani
- University of Bordeaux, CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, F-33405, Talence, France
| | - F N Beg
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - L Roso
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain
| | - L Volpe
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, E-37185, Villamayor, Salamanca, Spain.,Laser-Plasma Chair at the University of Salamanca, Salamanca, Spain.,Instituto Universitario de Física Fundamental y Matemáticas, 37008, Salamanca, Spain
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3
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Apiñaniz JI, Malko S, Fedosejevs R, Cayzac W, Vaisseau X, de Luis D, Gatti G, McGuffey C, Bailly-Grandvaux M, Bhutwala K, Ospina-Bohorquez V, Balboa J, Santos JJ, Batani D, Beg F, Roso L, Perez-Hernandez JA, Volpe L. A quasi-monoenergetic short time duration compact proton source for probing high energy density states of matter. Sci Rep 2021; 11:6881. [PMID: 33767262 PMCID: PMC7994565 DOI: 10.1038/s41598-021-86234-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 03/09/2021] [Indexed: 11/09/2022] Open
Abstract
We report on the development of a highly directional, narrow energy band, short time duration proton beam operating at high repetition rate. The protons are generated with an ultrashort-pulse laser interacting with a solid target and converted to a pencil-like narrow-band beam using a compact magnet-based energy selector. We experimentally demonstrate the production of a proton beam with an energy of 500 keV and energy spread well below 10[Formula: see text], and a pulse duration of 260 ps. The energy loss of this beam is measured in a 2 [Formula: see text]m thick solid Mylar target and found to be in good agreement with the theoretical predictions. The short time duration of the proton pulse makes it particularly well suited for applications involving the probing of highly transient plasma states produced in laser-matter interaction experiments. This proton source is particularly relevant for measurements of the proton stopping power in high energy density plasmas and warm dense matter.
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Affiliation(s)
- J I Apiñaniz
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain.
| | - S Malko
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - R Fedosejevs
- Department of Electrical and Computing Engineering, University of Alberta, Edmonton, AB, T6G 2V4, Canada
| | - W Cayzac
- CEA, DAM, DIF, 91297, Arpajon, France
| | | | - D de Luis
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - G Gatti
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - C McGuffey
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - M Bailly-Grandvaux
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - K Bhutwala
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - V Ospina-Bohorquez
- University of Salamanca, Salamanca, Spain.,CEA, DAM, DIF, 91297, Arpajon, France.,CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, University of Bordeaux, 33405, Talence, France
| | - J Balboa
- University of Salamanca, Salamanca, Spain
| | - J J Santos
- CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, University of Bordeaux, 33405, Talence, France
| | - D Batani
- CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, University of Bordeaux, 33405, Talence, France
| | - F Beg
- Center for Energy Research, University of California San Diego, La Jolla, CA, 92093, USA
| | - L Roso
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - J A Perez-Hernandez
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain
| | - L Volpe
- Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain.,Laser-Plasma Chair at the University of Salamanca, Salamanca, Spain.,Instituto Universitario Física Fundamental y Matemáticas, 37008, Salamanca, Spain
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4
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Ducret JE, Batani D, Boutoux G, Chancé A, Gastineau B, Guillard JC, Harrault F, Jakubowska K, Lantuejoul-Thfoin I, Leboeuf D, Loiseau D, Lotode A, Pès C, Rabhi N, Saïd A, Semsoum A, Serani L, Thomas B, Toussaint JC, Vauzour B. Calibration of the low-energy channel Thomson parabola of the LMJ-PETAL diagnostic SEPAGE with protons and carbon ions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:023304. [PMID: 29495838 DOI: 10.1063/1.5009737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The SEPAGE diagnostic will detect charged particles (electrons, protons, and ions) accelerated in the interaction of the PETAL (PETawatt Aquitaine Laser) laser with its targets on the LMJ (Laser MegaJoule)-PETAL laser facility. SEPAGE will be equipped with a proton-radiography front detector and two Thomson parabolas (TP), corresponding to different ranges of the particle energy spectra: Above 0.1 MeV for electrons and protons in the low-energy channel, with a separation capability between protons and 12C6+ up to 20 MeV proton energy and above 8 MeV for the high-energy channel, with a separation capability between protons and 12C6+ up to 200 MeV proton kinetic energy. This paper presents the calibration of the SEPAGE's low-energy channel TP at the Tandem facility of Orsay (France) with proton beams between 3 and 22 MeV and carbon-ion beams from 5.8 to 84 MeV. The magnetic and electric fields' integrals were determined with an accuracy of 10-3 by combining the deflections measured at different energies with different target thicknesses and materials, providing different in-target energy losses of the beam particles and hence different detected energies for given beam energies.
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Affiliation(s)
- J-E Ducret
- CELIA (Centre Lasers Intenses et Applications), Université Bordeaux, CNRS, CEA, UMR 5107, F-33405 Talence, France
| | - D Batani
- CELIA (Centre Lasers Intenses et Applications), Université Bordeaux, CNRS, CEA, UMR 5107, F-33405 Talence, France
| | - G Boutoux
- CELIA (Centre Lasers Intenses et Applications), Université Bordeaux, CNRS, CEA, UMR 5107, F-33405 Talence, France
| | - A Chancé
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - B Gastineau
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - J-C Guillard
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - F Harrault
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - K Jakubowska
- CELIA (Centre Lasers Intenses et Applications), Université Bordeaux, CNRS, CEA, UMR 5107, F-33405 Talence, France
| | | | - D Leboeuf
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - D Loiseau
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - A Lotode
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - C Pès
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - N Rabhi
- CELIA (Centre Lasers Intenses et Applications), Université Bordeaux, CNRS, CEA, UMR 5107, F-33405 Talence, France
| | - A Saïd
- Institut de Physique Nucléaire d'Orsay, 15 rue Georges Clémenceau, F-91405 Orsay cedex, France
| | - A Semsoum
- Institut de Physique Nucléaire d'Orsay, 15 rue Georges Clémenceau, F-91405 Orsay cedex, France
| | - L Serani
- Centre d'Etudes Nucléaires de Bordeaux Gradignan, Université de Bordeaux, UMR 5797 CNRS/IN2P3, Gradignan 33175, France
| | - B Thomas
- Centre d'Etudes Nucléaires de Bordeaux Gradignan, Université de Bordeaux, UMR 5797 CNRS/IN2P3, Gradignan 33175, France
| | - J-C Toussaint
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - B Vauzour
- CEA DAM DIF, F-91297 Arpajon, France
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5
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Sharif S, Braenzel J, Schnürer M, Prasad R, Borghesi M, Tikhonchuk V, Ter-Avetisyan S. Gated ion spectrometer for spectroscopy of neutral particles. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:083303. [PMID: 28863627 DOI: 10.1063/1.4997192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A new design of an ion mass spectrometer for the laser-plasma particle diagnostic, which is capable to detect simultaneously also neutral particles, is described. The particles are detected with micro-channel-plate detector operating in a gated mode. This allows us to separate x-rays and energetic electrons from other stray plasma emissions, e.g., neutral particles, which hit the detector in the same place. The ion energies are measured with the spectrometer in energy intervals corresponding to their time-of-flight within the gating window. The latter also defines the energy interval of neutrals recorded with the same time-of-flight. The spectrum of neutral particles can be reconstructed by subsequently collecting different parts of the spectrum while applying different delays on the gate pulse. That separation-in-time technique (time-of-flight mass spectrometry) in combination with the spatially separating mass analyzer (ion mass spectrometer) is used for the neutral particles spectroscopy.
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Affiliation(s)
- S Sharif
- Department of Physics and Photon Science, GIST, Gwangju 500-712, South Korea
| | - J Braenzel
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin 12489, Germany
| | - M Schnürer
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin 12489, Germany
| | - R Prasad
- Institute for Laser and Plasma Physics, Heinrich Heine University, Düsseldorf 40225, Germany
| | - M Borghesi
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7-1NN, United Kingdom
| | - V Tikhonchuk
- Centre Lasers Intenses et Applications, CEA, CNRS, University of Bordeaux, 33405 Talence, France
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6
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Tata S, Mondal A, Sarkar S, Lad AD, Krishnamurthy M. A gated Thomson parabola spectrometer for improved ion and neutral atom measurements in intense laser produced plasmas. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:083305. [PMID: 28863677 DOI: 10.1063/1.4998685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ions of high energy and high charge are accelerated from compact intense laser produced plasmas and are routinely analysed either by time of flight or Thomson parabola spectrometry. At the highest intensities where ion energies can be substantially large, both these techniques have limitations. Strong electromagnetic pulse noise jeopardises the arrival time measurement, and a bright central spot in the Thomson parabola spectrometer affects the signal to noise ratio of ion traces that approach close to the central spot. We present a gated Thomson parabola spectrometer that addresses these issues and provides an elegant method to improvise ion spectrometry. In addition, we demonstrate that this method provides the ability to detect and measure high energy neutral atoms that are invariably present in most intense laser plasma acceleration experiments.
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Affiliation(s)
- Sheroy Tata
- Tata Institute of Fundamental Research, Mumbai 400 005, India
| | - Angana Mondal
- Tata Institute of Fundamental Research, Mumbai 400 005, India
| | - Soubhik Sarkar
- Tata Institute of Fundamental Research, Mumbai 400 005, India
| | - Amit D Lad
- Tata Institute of Fundamental Research, Mumbai 400 005, India
| | - M Krishnamurthy
- Tata Institute of Fundamental Research, Mumbai 400 005, India
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7
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Jeong TW, Singh PK, Scullion C, Ahmed H, Kakolee KF, Hadjisolomou P, Alejo A, Kar S, Borghesi M, Ter-Avetisyan S. Experimental evaluation of the response of micro-channel plate detector to ions with 10s of MeV energies. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:083301. [PMID: 27587107 DOI: 10.1063/1.4959187] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The absolute calibration of a microchannel plate (MCP) assembly using a Thomson spectrometer for laser-driven ion beams is described. In order to obtain the response of the whole detection system to the particles' impact, a slotted solid state nuclear track detector (CR-39) was installed in front of the MCP to record the ions simultaneously on both detectors. The response of the MCP (counts/particles) was measured for 5-58 MeV carbon ions and for protons in the energy range 2-17.3 MeV. The response of the MCP detector is non-trivial when the stopping range of particles becomes larger than the thickness of the detector. Protons with energies E ≳ 10 MeV are energetic enough that they can pass through the MCP detector. Quantitative analysis of the pits formed in CR-39 and the signal generated in the MCP allowed to determine the MCP response to particles in this energy range. Moreover, a theoretical model allows to predict the response of MCP at even higher proton energies. This suggests that in this regime the MCP response is a slowly decreasing function of energy, consistently with the decrease of the deposited energy. These calibration data will enable particle spectra to be obtained in absolute terms over a broad energy range.
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Affiliation(s)
- Tae Won Jeong
- Center for Relativistic Laser Science, Institute of Basic Science (IBS), Gwangju 61005, South Korea
| | - P K Singh
- Center for Relativistic Laser Science, Institute of Basic Science (IBS), Gwangju 61005, South Korea
| | - C Scullion
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - H Ahmed
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - K F Kakolee
- Center for Relativistic Laser Science, Institute of Basic Science (IBS), Gwangju 61005, South Korea
| | - P Hadjisolomou
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - A Alejo
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - S Kar
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - M Borghesi
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - S Ter-Avetisyan
- Center for Relativistic Laser Science, Institute of Basic Science (IBS), Gwangju 61005, South Korea
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8
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Ter-Avetisyan S, Braenzel J, Schnürer M, Prasad R, Borghesi M, Jequier S, Tikhonchuk V. New source of MeV negative ion and neutral atom beams. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:02B134. [PMID: 26932016 DOI: 10.1063/1.4935234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The scenario of "electron-capture and -loss" was recently proposed for the formation of negative ion and neutral atom beams with MeV kinetic energies. However, it does not explain why the formation of negative ions in a liquid spray is much more efficient than with an isolated atom. The role of atomic excited states in the charge-exchange processes is considered, and it is shown that it cannot account for the observed phenomena. The processes are more complex than the single electron-capture and -loss approach. It is suggested that the shell effects in the electronic structure of the projectile ion and/or target atoms may influence the capture/loss probabilities.
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Affiliation(s)
- S Ter-Avetisyan
- Center for Relativistic Laser Science, Institute for Basic Science (IBS), Gwangju 500-712, South Korea
| | - J Braenzel
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin 12489, Germany
| | - M Schnürer
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin 12489, Germany
| | - R Prasad
- Institute for Laser and Plasma Physics, Heinrich Heine University, Duesseldorf 40225, Germany
| | - M Borghesi
- School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7-1NN, United Kingdom
| | - S Jequier
- Centre Lasers Intenses et Applications, CEA, CNRS, University of Bordeaux, 33405 Talence, France
| | - V Tikhonchuk
- Centre Lasers Intenses et Applications, CEA, CNRS, University of Bordeaux, 33405 Talence, France
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