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1.
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;
2.
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;
3.
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
4.
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
5.
Instrumentation and Operation of a Remote Operation Beam Diagnostics Lab at the Cornell Electron-positron Storage Ring / Holtzapple, Robert (Alfred University, Alfred, New York) ; Cerio, Benjamin (Colgate University, Hamilton, New York) ; Kern, Jamie (Alfred University, Alfred, New York) ; Palmer, Mark Alan (Cornell University, Ithaca, New York) ; Stonaha, Paul J (Alfred University, Alfred, New York)
2006 - 3 p. External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1238
6.
Longitudinal Beam Stability for CESR-c / Holtzapple, Robert (Alfred University, Alfred, New York) ; Cerio, Benjamin (Colgate University, Hamilton, New York) ; Kern, Jamie (Alfred University, Alfred, New York) ; Palmer, Mark Alan (Cornell University, Ithaca, New York) ; Stonaha, Paul J (Alfred University, Alfred, New York)
2006 - 3 p. External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.634
7.
Single-Bunch Tune and Beam Size Measurements Along Bunch Trains in PEP-II / Holtzapple, Robert ; Dujmic, Denis ; Fisher, Alan S
By scanning a gated camera and a gated tune monitor across the bunch pattern during normal colliding-bunch operation of PEP-II, the single-bunch tunes and beam sizes were measured simultaneously in the high and low energy storage rings of PEP-II. The measurements were made with 1561 colliding bunches in PEP-II, arranged in trains of 66 bunches, with each bunch in the train separated by 4.2 ns. [...]
SLAC-PUB-11231.- Stanford, CA : SLAC, 2005 - 4 p. External links: Fulltext from SLAC; Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2006
8.
Bunch-Length Measurements in PEP-II / Fisher, S A ; Holtzapple, Robert ; Novokhatski, Alexander ; Turner, J L ; Wienands, Ulrich ; Yocky, Gerald S
SLAC-PUB-11230.- Stanford, CA : SLAC, 2005 - 4 p. External links: Fulltext from SLAC; Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.1934

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