Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Sam Posen"'
Publikováno v:
APL Materials, Vol 12, Iss 7, Pp 071106-071106-5 (2024)
Despite having advantageous superconducting properties, Nb3Sn superconducting radiofrequency (SRF) cavities still have practical challenges compared to Nb SRF cavities due to the brittle nature of Nb3Sn. Performance degradation can occur when an Nb3S
Externí odkaz:
https://doaj.org/article/db0c928f27774441801124321723f732
Autor:
Sam Posen, Matthias Liepe
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 17, Iss 11, p 112001 (2014)
A 1.3 GHz Nb_{3}Sn superconducting radio-frequency cavity prepared with a modified annealing step reached B_{pk}>50 mT, well above B_{c1}=25±7 mT, without the strong Q-slope observed in previous Nb_{3}Sn cavities. At 4.2 K, it has a Q_{0} of approxi
Externí odkaz:
https://doaj.org/article/b0acd89a4f12436483a572c93b97e397
Autor:
Sam Posen, Matthias Liepe
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 15, Iss 2, p 022002 (2012)
Several planned accelerator facilities call for hundreds of elliptical cavities operating cw with low effective beam loading, and therefore require cavities that have been mechanically optimized to operate at high Q_{L} by minimizing df/dp, the sensi
Externí odkaz:
https://doaj.org/article/3f2416a09ab14f7b88f2bbfe552643af
In this study we will show a new method of polishing for Nb3Sn cavities known as centrifugal barrel polishing (CBP). Using this method, Nb3Sn coated samples are polished to a surface roughness comparable to a traditional Nb cavity after electropolish
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71dddc2d656fab6a8594637288874df0
Autor:
Jin-Su Oh, Xiaotian Fang, Tae-Hoon Kim, Matt Lynn, Matt Kramer, Mehdi Zarea, James A. Sauls, Alexander Romanenko, Sam Posen, Anna Grassellino, Cameron J. Kopas, Mark Field, Jayss Marshall, Hilal Cansizoglu, Kameshwar Yadavalli, Joshua Y. Mutus, Matthew Reagor, Lin Zhou
Publikováno v:
Applied Surface Science. 627:157297
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18f84c9c5eff77e5a0c360a2ff6a029c
https://doi.org/10.1016/j.apsusc.2023.157297
https://doi.org/10.1016/j.apsusc.2023.157297
Autor:
Sam Posen, Tiziana Spina, Daniel Hall, Jaeyel Lee, Sung Il Baik, David N. Seidman, Zu Hawn Sung, Zugang Mao, Matthias Liepe, Kai He
Publikováno v:
Acta Materialia. 188:155-165
We report on atomic-scale analyses of grain boundary (GB) structures and segregation in Nb3Sn coatings on Nb, prepared by the vapor-diffusion process, for superconducting radiofrequency (SRF) cavity applications, utilizing atom-probe tomography, high
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b02e9f8400f112045d853ea6938cf43d
https://doi.org/10.1016/j.actamat.2020.01.055
https://doi.org/10.1016/j.actamat.2020.01.055
Autor:
Jin-Su Oh, Xiaotian Fang, Tae-Hoon Kim, Matt Lynn, Matt Kramer, Mehdi Zarea, James Sauls, Alex Romanenko, Sam Posen, Anna Grassellino, Cameron J. Kopas, Mark Field, Jayss Marshall, Hilal Cansizoglu, Joshua Y. Mutus, Matthew Reagor, Lin Zhou
Publikováno v:
SSRN Electronic Journal.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd892b3a35c77a05393929384e658fdf
https://doi.org/10.2139/ssrn.4128730
https://doi.org/10.2139/ssrn.4128730
Autor:
Damon J. Bice, Charles Grimm, James Blowers, Thomas H. Nicol, Martina Martinello, Joshua Kaluzny, Brian Hartsell, T. Arkan, Mattia Checchin, Sam Posen
Publikováno v:
LCLS-II-HE Cryomodule Production Status at Fermilab.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c73376f475752a5701d8b626039307ef
https://doi.org/10.2172/1827842
https://doi.org/10.2172/1827842
Autor:
Sam Posen
Publikováno v:
Cryomodule Test.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0bebf1574177a98097786f1a275186c0
https://doi.org/10.2172/1841388
https://doi.org/10.2172/1841388
Autor:
Jayakar Thangaraj, Sam Posen, Robert Kephart, Ram Dhuley, Thomas H. Nicol, Roman Kostin, T. Kroc, Michael Geelhoed, Oleg Prokofiev
Publikováno v:
IEEE Transactions on Applied Superconductivity. 29:1-5
Superconducting radio frequency (SRF) cavities with quality factors ∼1010 near 4 K have potential to be cooled using regenerative-cycle cryocoolers. Contrary to using liquid helium, cryogen-free operation can be realized by conductively linking a c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc80b439a60d7361d0af607f330abf24
https://doi.org/10.1109/tasc.2019.2901252
https://doi.org/10.1109/tasc.2019.2901252