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Differential measurement of trident production in strong electromagnetic fields
/ Nielsen, Christian F. (Aarhus U.) ; Holtzapple, Robert (Cal. Poly.) ; Lund, Mads M. (Aarhus U.) ; Surrow, Jeppe H. (Aarhus U.) ; Sørensen, Allan H. (Aarhus U.) ; Sørensen, Marc B. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.)
/CERN NA63 Collaboration
In this paper, we present experimental results and numerical simulations of trident production, $e^-\rightarrow e^-e^+e^-$, in a strong electromagnetic field. The experiment was conducted at CERN for the purpose of probing the strong-field parameter $\chi$ up to 2.4, using a 200 GeV electron beam penetrating a 400 $\mu$m thick germanium crystal oriented along the $\langle 110\rangle$ axis. [...]
arXiv:2307.03464.-
2023-09-01 - 29 p.
- Published in : Phys. Rev. D 108 (2023) 052013
Fulltext: Publication - PDF; 2307.03464 - PDF;
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2.
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Precision Measurement of Trident Production in Strong Electromagnetic Fields
/ Nielsen, Christian F. (Aarhus U.) ; Holtzapple, Robert (Cal. Poly.) ; Lund, Mads M. (Aarhus U.) ; Surrow, Jeppe H. (Aarhus U.) ; Sørensen, Marc B. (Aarhus U.) ; Uggerhøj, Ulrik I. (Aarhus U.)
/NA63 Collaboration
We demonstrate experimentally that the trident process $e^-\rightarrow e^-e^+e^-$ in a strong external field, with a spatial extension comparable to the effective radiation length, is well understood theoretically. The experiment, conducted at CERN, probes values for the strong field parameter $\chi$ up to 2.4. [...]
arXiv:2211.02390.-
2023-02-14 - 5 p.
- Published in : Phys. Rev. Lett. 130 (2023) 071601
Fulltext: 2211.02390 - PDF; Publication - PDF;
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3.
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Pair Spectrometer for FACET-II
/ Naranjo, Brian (UCLA) ; Andonian, Gerard (UCLA) ; Cavanagh, Niall (Queen's U., Belfast) ; Di Piazza, Antonino (Heidelberg, Max Planck Inst.) ; Fukasawa, Atsushi (UCLA) ; Gerstmayr, Elias (SLAC) ; Holtzapple, Robert (Cal. Poly.) ; Keitel, Christoph (Heidelberg, Max Planck Inst.) ; Majernik, Nathan (UCLA) ; Meuren, Sebastian (SLAC) et al.
We present the design of a pair spectrometer for use at FACET-II, where there is a need for spectroscopy of photons having energies up to 10 GeV. Incoming gammas are converted to high-energy positron-electron pairs, which are then subsequently analyzed in a dipole magnet. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 4336-4339
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4336-4339
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4.
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5.
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6.
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7.
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Status for 2019, CERN NA63
/ Nielsen, CF ; Justesen, JB ; Soerensen, AH ; Uggerhoej, UI ; Wistisen, TN ; Di Piazza, A ; Holtzapple, R
In the NA63 experiment of April 2018 data was taken for 20, 40 and 80 GeV electrons and positrons aligned to the h100i axis of a diamond crystal of thickness 1.5 mm, as well as for 40 and 80 GeV electrons on a 1.0 mm thick diamond aligned to the h100i axis. [...]
CERN-SPSC-2019-018 ; SPSC-SR-253.
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2019.
Fulltext
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8.
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Observations and predictions at CesrTA, and outlook for ILC
/ Dugan, G. (Cornell U., CLASSE) ; Billing, M. (Cornell U., CLASSE) ; Butler, K. (Cornell U., CLASSE) ; Chu, J. (Cornell U., CLASSE) ; Crittenden, J. (Cornell U., CLASSE) ; Forster, M. (Cornell U., CLASSE) ; Kreinick, D. (Cornell U., CLASSE) ; Meller, R. (Cornell U., CLASSE) ; Palmer, M. (Cornell U., CLASSE) ; Ramirez, G. (Cornell U., CLASSE) et al.
In this paper, we will describe some of the recent experimental measurements [1, 2, 3] performed at CESRTA [4], and the supporting simulations, which probe the interaction of the electron cloud with the stored beam. These experiments have been done over a wide range of beam energies, emittances, bunch currents, and fill patterns, to gather sufficient information to be able to fully characterize the beam-electron-cloud interaction and validate the simulation programs. [...]
arXiv:1310.0261.-
Geneva : CERN, 2013 - 11 p.
Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : ECLOUD’12: Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects, pp.31-41
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9.
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Intrabeam Scattering Studies at CesrTA
/ (Fermilab ; Cornell U., CLASSE) ; (Fermilab ; Cornell U., CLASSE) ; (Fermilab ; Cornell U., CLASSE) ; Peterson, DP (Cornell U., CLASSE) ; Rider, NT (Cornell U., CLASSE) ; Rubin, DL (Cornell U., CLASSE) ; Holtzapple, R (Cal. Poly.) ; Campbell, R (Cal. Poly.) ; Shanks, JP (Cornell U., CLASSE) ; Strohman, CR (Cornell U., CLASSE) et al.
Intrabeam scattering (IBS) dilutes the emittance of low energy, low emittance rings. Because CesrTA can be operated at low energies with low transverse emittances and high bunch intensity, it is well-suited for the study of IBS. [...]
2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. WEPPR015
External link: Published from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.2970-2972
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10.
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Electron Cloud at Low Emittance in CesrTA
/ Palmer, Mark (Cornell U., CLASSE) ; Alexander, James (Cornell U., CLASSE) ; Billing, Michael (Cornell U., CLASSE) ; Calvey, Joseph (Cornell U., CLASSE) ; Conolly, Christopher (Cornell U., CLASSE) ; Crittenden, James (Cornell U., CLASSE) ; Dobbins, John (Cornell U., CLASSE) ; Dugan, Gerald (Cornell U., CLASSE) ; Eggert, Nicholas (Cornell U., CLASSE) ; Fontes, Ernest (Cornell U., CLASSE) et al.
The Cornell Electron Storage Ring (CESR) has been reconfigured as a test accelerator (CesrTA) for a program of electron cloud (EC) research at ultra low emittance. The instrumentation in the ring has been upgraded with local diagnostics for measurement of cloud density and with improved beam diagnostics for the characterization of both the low emittance performance and the beam dynamics of high intensity bunch trains interacting with the cloud [...]
2010
External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUYMH02
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