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2023-03-25
06:30
A Novel Design for Improving the Control on the Stainless-Steel Vessel Welding Process for Superconducting Magnets / Vallone, G (LBL, Berkeley) ; Ambrosio, G (Fermilab) ; Anderssen, E (LBL, Berkeley) ; Fehrer, S (Fermilab) ; Ferracin, P (LBL, Berkeley) ; Ferradas Troitino, J (CERN)
Stainless steel vessels see widespread use in superconducting magnets for particle accelerator applications. [...]
FERMILAB-PUB-22-858-TD. - 2022. - 5 p.
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2023-03-25
06:30
Recent advances and perspectives of the high precision laser metrology / Batusov, V (Dubna, JINR) ; Budagov, J (Dubna, JINR) ; Glagolev, V (Dubna, JINR) ; Lyablin, M (Dubna, JINR) ; Shirkov, G (Dubna, JINR) ; Gayde, J Ch (CERN) ; Di Girolamo, B (CERN) ; Mainaud Durand, H (CERN) ; Mergelkuhl, D (CERN) ; Nessi, M (CERN) et al.
The laser-based metrology presents new means and opens possibilities in solving tasks where achievement of a high precision survey is of the principal signiˇcance necessity. The extended laser ˇducial line (coordinate axis) is necessary for precision alignment of basic structure units of large-scale accelerators, for precision assembly of subdetectors when mounting large spectrometric complexes, for online control of space stability of particle detectors during the data taking period. The high sensitivity laser inclinometers open the new possibilities for ground motion control and for accelerator (collider) beam space stabilization essential for achievement of stable high intensity (luminosity) at the interaction area. The investigation has been performed at the Dzhelepov Laboratory of Nuclear Problems, JINR..
E13-2014-21. - 2014. - 17 p.
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2023-03-25
06:30
Analysis of inhomogeneities in Nb$_{3}$Sn wires by combined SEM and SHPM and their impact on J $_{c}$ and T $_{c}$ / Pfeiffer, S (Vienna, Tech. U. ; CERN) ; Baumgartner, T (Vienna, Tech. U., Atominst.) ; Löffler, S (Vienna, Tech. U.) ; Stöger-Pollach, M (Vienna, Tech. U.) ; Hopkins, S C (CERN) ; Ballarino, A (CERN) ; Eisterer, M (Vienna, Tech. U., Atominst.) ; Bernardi, J (Vienna, Tech. U.)
Abstract We demonstrate the combined use of scanning electron microscopy (SEM) and scanning Hall probe microscopy (SHPM) to analyse inhomogeneities in Nb3Sn wires. Inhomogeneities of the A15 phase in Nb3Sn sub-elements of a Ti-alloyed Restacked Rod Process wire and a Ta-alloyed Powder-In-Tube wire are investigated. [...]
2023 - 11 p. - Published in : Supercond. Sci. Technol. 36 (2023) 045008 Fulltext: PDF;

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2023-03-25
04:21
N-doped surfaces of superconducting niobium cavities as a disordered composite-addendum / Weingarten, Wolfgang (CERN)
Experimental data on N-doped superconducting (sc) cavities are further analyzed which contribute to confirm a recently proposed model explaining the increase of the Q-value versus the accelerating gradient..
arXiv:2207.11573. - 4 p.
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2023-03-25
04:21
Longitudinally strong focusing lattice for Compton--ring gamma sources / Bulyak, Eugene (Kharkov, KIPT) ; Rinolfi, Louis (CERN) ; Urakawa, Junji (KEK, Tsukuba)
Electron storage rings of GeV energy with laser pulse stacking cavities are promising intense sources of polarised hard photons which, via pair production, can be used to generate polarised positron beams. [...]
arXiv:2207.03857. - 5 p.
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2023-03-25
04:20
Development of a Virtual EM Detector for the Advanced Particle Accelerator Modeling Code WarpX / Rheaume, Elisa (Cal State, Long Beach ; LBNL, Berkeley) ; Giacomel, Lorenzo (CERN) ; Vay, Jean-Luc (LBNL, Berkeley) ; Huebl, Axel (LBNL, Berkeley)
In physics research particle accelerators are highly valued, and extraordinarily expensive, technical instruments. [...]
arXiv:2201.08469. - 9 p.
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2023-03-25
04:19
Review of coupled betatron motion parametrizations and applications to strongly coupled lattices / Vanwelde, Marion (U. Brussels (main)) ; Hernalsteens, Cédric (CERN ; U. Brussels (main)) ; Bogacz, S. Alex (Jefferson Lab) ; Machida, Shinji (Rutherford) ; Pauly, Nicolas (U. Brussels (main))
The coupling of transverse motion is a natural occurrence in particle accelerators, either in the form of a residual coupling arising from imperfections or originating by design from strong systematic coupling fields. [...]
arXiv:2210.11866. - 33 p.
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2023-03-25
04:19
Local power coupling as a predictor of high-gradient breakdown performance / Paszkiewicz, Jan (CERN) ; Grudiev, Alexej (CERN) ; Wuensch, Walter (CERN)
A novel quantity for predicting the high-gradient performance of radio frequency accelerating structures is presented. [...]
arXiv:2209.15291. - 16 p.
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2023-03-25
04:13
A first taste of nonlinear beam dynamics / Bartosik, H. (CERN) ; Papaphilippou, Y. (CERN) ; Wolski, A. (U. Liverpool (main) ; Cockcroft Inst. Accel. Sci. Tech.)
Nonlinear dynamics can impact the performance of a particle accelerator in a number of different ways, depending on the type of the accelerator and the parameter regime in which it operates. [...]
arXiv:2201.01532. - 36 p.
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2023-03-25
04:13
MQXFA Final Design Report / Ambrosio, Giorgio (Fermilab) ; Amm, Kathleen (Brookhaven) ; Anerella, Mike (Brookhaven) ; Apollinari, Giorgio (Fermilab) ; Baldini, Maria (Fermilab) ; Yahia, Anis Ben (Brookhaven) ; Blowers, James (Fermilab) ; Carcagno, Ruben (Fermilab) ; Cheng, Daniel (LBL, Berkeley) ; Chlachidze, Guram (Fermilab) et al.
The MQXFA Quadrupole magnets will be installed in High Luminosity LHC to form the Q1 and Q3 inner triplet optical elements in front of the interaction points 1 (ATLAS) and 5 (CMS) [...]
arXiv:2203.06723 ; FERMILAB-TM-2773-TD ; US-HiLumi-doc-948. - 120 p.
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