CERN Accelerating science

Article
Report number	arXiv:2204.01937
Title	$^{22}$Na activation level measurements of fused silica rods in the LHC target absorber for neutrals compared to simulations
Related title	$^{22}$Na Activation Level Measurements of Fused Silica Rods in the LHC Target Absorber for Neutrals (TAN) Compared to FLUKA Simulations
Author(s)	Yang, S. (Illinois U., Urbana ; Illinois U., Urbana (main)) ; Gilarte, M. Sabate (CERN) ; Tate, A. (Illinois U., Urbana ; Illinois U., Urbana (main)) ; Santiago, N. (Illinois U., Urbana ; Illinois U., Urbana (main)) ; Longo, R. (Illinois U., Urbana) ; Mazzoni, S. (CERN) ; Cerutti, F. (CERN) ; Bravin, E. (CERN) ; Grosse Perdekamp, M. (Illinois U., Urbana) ; Lerner, G. (CERN) ; Prelipcean, D. (CERN ; Munich, Tech. U.) ; Citron, Z. (Ben Gurion U. of Negev) ; Cole, B. (Columbia U. (main) ; Nevis Labs, Columbia U.) ; Jackobsen, S. (CERN) ; Kaminski, M.D. (Illinois U., Urbana (main) ; Argonne (main)) ; Koeth, T. (Maryland U., College Park) ; Lantz, C. (Illinois U., Urbana) ; MacLean, D. (Illinois U., Urbana) ; Mignerey, A. (Maryland U., College Park) ; Murray, M. (Kansas U.) ; Palm, M. (CERN) ; Phipps, M. (Illinois U., Urbana) ; Steinberg, P. (Brookhaven Natl. Lab.) ; Tsinganis, A. (CERN)
Publication	2022-09-01
Imprint	2022-04-04
Number of pages	11
Note	11 pages, 14 figures, to be submitted to PRAB
In:	Phys. Rev. Accel. Beams 25 (2022) 091001
DOI	10.1103/PhysRevAccelBeams.25.091001 (publication)
Subject category	physics.acc-ph ; physics.ins-det ; Accelerators and Storage Rings ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC
Abstract	The Target Absorbers for Neutrals (TANs) are located in a high-intensity radiation environment inside the tunnel of the Large Hadron Collider (LHC). TANs are positioned about $140$ m downstream from the beam interaction points. Seven $40$ cm long fused silica rods with different dopant specifications were irradiated in the TAN by the Beam RAte of Neutrals (BRAN) detector group during $p$+$p$ data taking from 2016 to 2018 at the LHC. The peak dose delivered to the fused silica rods was $18$ MGy. We report measurements of the $^{22}$Na activation of the fused silica rods carried out at the University of Illinois at Urbana-Champaign and Argonne National Laboratory. At the end of the irradiation campaign, the maximum $^{22}$Na activity observed was $A=21$ kBq$/{\rm cm^3}$ corresponding to a density, $\rho= 2.5\times 10^{12} /{\rm cm^3}$, of $^{22}$Na nuclei. FLUKA Monte Carlo simulations have been performed by the CERN FLUKA team to estimate $^{22}$Na activities for the irradiated BRAN rod samples. The simulations reproduce the $^{22}$Na activity profile measured along the rods, with a 35% underestimation of the experimental measurement results.
Copyright/License	publication: © 2022-2025 authors (License: CC BY 4.0) preprint: (License: arXiv nonexclusive-distrib 1.0)

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