Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Scott Lawrie"'
Autor:
Dan Faircloth, Scott Lawrie
Publikováno v:
New Journal of Physics, Vol 20, Iss 2, p 025007 (2018)
An overview of high current (>1 mA) negative hydrogen ion (H ^– ) sources that are currently used on particle accelerators. The current understanding of how H ^– ions are produced is summarised. Issues relating to caesium usage are explored. The
Externí odkaz:
https://doaj.org/article/2e25a49aa1e34aecbd356f801de839f3
Publikováno v:
Journal of Instrumentation. 18:C05023
We have developed a semi-empirical model predicting the equilibrium caesium coverage (in monolayers) and the resulting work function of the ISIS Penning ion source cathode (in eV) in long pulse operation. We use the caesium balance model to predict t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2de2bd1d45c4c4f014ba4caac31d207a
https://doi.org/10.1088/1748-0221/18/05/c05023
https://doi.org/10.1088/1748-0221/18/05/c05023
Autor:
Olli Tarvainen, Scott Lawrie
Publikováno v:
SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020).
Modern high power proton accelerators and fusion facilities usually exploit negative ion injection. The ISIS pulsed spallation neutron and muon facility uses a high power Penning-type H− ion source. Over the years, several variations of the source
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fed2f7328c79436112c55a637bc7b8ef
https://doi.org/10.1063/5.0057743
https://doi.org/10.1063/5.0057743
Autor:
John Macgregor, Thomas Thuillier, Tiago Sarmento, Mark Whitehead, Olli Tarvainen, Scott Lawrie, Dan Faircloth, Jean-Baptiste Lallement, P. Sole, Jacques Lettry, T. Wood, Robert Abel, Daniel Noll, J. Angot
Publikováno v:
AIP Conf.Proc.
6th International Symposium on Negative Ions, Beams and Sources
6th International Symposium on Negative Ions, Beams and Sources, Sep 2018, Novosibirsk, Russia. pp.050005, ⟨10.1063/1.5083759⟩
AIP Conference Proceedings volume 2052
6th International Symposium on Negative Ions, Beams and Sources
6th International Symposium on Negative Ions, Beams and Sources, Sep 2018, Novosibirsk, Russia. pp.050005, ⟨10.1063/1.5083759⟩
AIP Conference Proceedings volume 2052
International audience; A project to design and construct an RF-driven long-lifetime volume production ion source producing 30 mA of H− with 50 Hz repetition rate and 1.5% duty factor at 35 keV energy for the ISIS Neutron and Muon Source has been s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80e56b2fc3ac8e4a5851059a19741a56
https://hal.archives-ouvertes.fr/hal-02154744
https://hal.archives-ouvertes.fr/hal-02154744
Autor:
D. C. Faircloth, Robert Abel, John Macgregor, Tiago Sarmento, Olli Tarvainen, Scott Lawrie, Mark Whitehead, T. Wood
Publikováno v:
AIP Conference Proceedings.
Experiments on the Vessel for Extraction and Source Plasma Analyses (VESPA) to investigate the effect of heated graphite on caesium diagnostics are presented. Current operational caesiated Penning-type H− sources on ISIS provide 35 mA, 200 µs beam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ccf2d34c7ced4d0b09d586afb600adfc
https://doi.org/10.1063/1.5083760
https://doi.org/10.1063/1.5083760
Publikováno v:
AIP Conference Proceedings.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48466fe253c5e2f8e053219523656561
https://doi.org/10.1063/1.5053258
https://doi.org/10.1063/1.5053258
Publikováno v:
AIP Conference Proceedings.
In order to facilitate the testing of advanced H− ion sources for the ISIS and Front End Test Stand (FETS) facilities at the Rutherford Appleton Laboratory (RAL), a Vessel for Extraction and Source Plasma Analyses (VESPA) has been constructed. This
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99b6181378ed87a458c800e8c92edb7b
https://doi.org/10.1063/1.4916438
https://doi.org/10.1063/1.4916438
Autor:
D. Fernández-Cañoto, J. L. Munoz, Aitor Zugazaga, Ibon Bustinduy, Scott Lawrie, Dan Faircloth, Zunbeltz Izaola, J. Feuchtwanger
Publikováno v:
AIP Conference Proceedings.
The first beam measurements on our modified version of the ISIS Penning source show a beam of relatively low current. As a result of this, the actual extraction system was simulated using IBSimu, and it was found that the configuration is far from th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5971e2b9a0c8b48770d4f91978b5fc74
https://doi.org/10.1063/1.4792831
https://doi.org/10.1063/1.4792831
Autor:
Mark Whitehead, John Simkin, C. Gabor, Michael Perkins, Taneli Kalvas, Zunbeltz Izaola, Olli Tarvainen, J. Komppula, T. Wood, Hugo Pereira, Alan Letchford, Vadim Dudnikov, Scott Lawrie, Dan Faircloth
All the Front End Test Stand (FETS) beam requirements have been achieved, but not simultaneously [1]. At 50 Hz repetition rates beam current droop becomes unacceptable for pulse lengths longer than 1 ms. This is fundamental limitation of the present
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::007df0a41e57d61d2393e3fd3b1be2d8
http://juuli.fi/Record/0038322313
http://juuli.fi/Record/0038322313
Autor:
D. C. Faircloth, Scott Lawrie
Publikováno v:
AIP Conference Proceedings.
A vacuum-vessel for extraction and source plasma analyses (VESPA) has been constructed with the aim of understanding the dominant plasma processes of negative hydrogen (H−) ion formation in the ISIS Penning ion source. The VESPA has been designed t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ad10aaf1bef6457f0bbd679c3ccb018
https://doi.org/10.1063/1.4792814
https://doi.org/10.1063/1.4792814