002909524 001__ 2909524 002909524 005__ 20240911203300.0 002909524 0248_ $$aoai:cds.cern.ch:2909524$$pcerncds:FULLTEXT 002909524 037__ $$aCERN-LHCC-2024-014 002909524 088__ $$aLHCC-I-040-ADD-1 002909524 100__ $$aAbbaneo, D 002909524 245__ $$aAddendum to the AdvancedSND LoI 002909524 260__ $$c2024 002909524 269__ $$aGeneva$$bCERN$$c10 Sep 2024 002909524 270__ [email protected] 002909524 270__ [email protected] 002909524 270__ [email protected] 002909524 300__ $$amult. p 002909524 490__ $$aLetter of Intent 002909524 520__ $$aOver the six months since the submission of the AdvSND LoI \cite{ADVSND_LOI}, the Collaboration has been intensively discussing with the CERN civil engineering team and the High Luminosity LHC (HL LHC) planning officers to fully understand the constraints related to the civil engineering modifications required for TI18. These modifications are necessary to optimize the physics performance of the AdvSND detector and profit of the LHC High-luminosity. Through these discussions, it became evident that the excavation of the TI18 floor must be limited to comply with specific boundaries. Exceeding these boundaries could compromise the tunnel's structural stability, necessitating extensive excavation to restore the integrity of the concrete structures. Additionally, substantial temporary mechanical reinforcements would be required to ensure stability during construction. Addressing these structural stability concerns would make it impossible to meet the schedule constraints of the HL LHC. Given these constraints, the following decisions and modifications have been made compared to the original Letter of Intent. This document outlines these changes in detail 002909524 595__ $$aLHCC 002909524 595__ $$aCERN EDS 002909524 65017 $$2SzGeCERN$$aDetectors and Experimental Techniques 002909524 690C_ $$aCERN 002909524 690C_ $$aSCICOM 002909524 690C_ $$aPUBLLHCC 002909524 700__ $$aAlbanese, R 002909524 700__ $$aAlexandrov, A 002909524 700__ $$aAlicante, F 002909524 700__ $$aAndrosov, K 002909524 700__ $$aAnokhina, A 002909524 700__ $$aAsada, T 002909524 700__ $$aAsawatangtrakuldee, C 002909524 700__ $$aAyala Torres, M A 002909524 700__ $$aBattilana, C 002909524 700__ $$aBay, A 002909524 700__ $$aBertocco, A 002909524 700__ $$aBertone, C 002909524 700__ $$aBetancourt, C 002909524 700__ $$aBick, D 002909524 700__ $$aBiswas, R 002909524 700__ $$aBlanco Castro, A 002909524 700__ $$aBoccia, V 002909524 700__ $$aBogomilov, M 002909524 700__ $$aBoiano, A 002909524 700__ $$aBonacorsi, D 002909524 700__ $$aBonivento, W M 002909524 700__ $$aBordalo, P 002909524 700__ $$aBoyarsky, A 002909524 700__ $$aBud, T 002909524 700__ $$aBuonocore, L 002909524 700__ $$aBuontempo, S 002909524 700__ $$aCampanelli, M 002909524 700__ $$aCamporesi, T 002909524 700__ $$aCanale, V 002909524 700__ $$aCentanni, D 002909524 700__ $$aCerutti, F 002909524 700__ $$aChernyavskiy, M 002909524 700__ $$aChoi, K -Y 002909524 700__ $$aCholak, S 002909524 700__ $$aCindolo, F 002909524 700__ $$aClimescu, M 002909524 700__ $$aConaboy, A P 002909524 700__ $$aCrespo-Lopez, O 002909524 700__ $$aDallavalle, G M 002909524 700__ $$aDavino, D 002909524 700__ $$ade Bryas, P T 002909524 700__ $$aDe Lellis, G 002909524 700__ $$ade Magistris, M 002909524 700__ $$aDe Roeck, A 002909524 700__ $$aDe Rùjula, A 002909524 700__ $$aDe Simone, D 002909524 700__ $$aDi Crescenzo, A 002909524 700__ $$aDi Ferdinando, D 002909524 700__ $$aDi Luca, S 002909524 700__ $$aDi Meo, P 002909524 700__ $$aDinc, C 002909524 700__ $$aDonà, R 002909524 700__ $$aDurhan, O 002909524 700__ $$aFabbri, F 002909524 700__ $$aFedotovs, F 002909524 700__ $$aFerrillo, M 002909524 700__ $$aFiorillo, A 002909524 700__ $$aFresa, R 002909524 700__ $$aFunk, W 002909524 700__ $$aGaignant, C 002909524 700__ $$aGaray Walls, F M 002909524 700__ $$aGolovatiuk, A 002909524 700__ $$aGolutvin, A 002909524 700__ $$aGraverini, E 002909524 700__ $$aGuiducci, L 002909524 700__ $$aGuler, A M 002909524 700__ $$aGuliaeva, V 002909524 700__ $$aHaefeli, G J 002909524 700__ $$aHagner, C 002909524 700__ $$aHelo Herrera, J C 002909524 700__ $$aHerty, A 002909524 700__ $$avan Herwijnen, E 002909524 700__ $$aIengo, P 002909524 700__ $$aIlieva, S 002909524 700__ $$aInfantino, A 002909524 700__ $$aIuliano, A 002909524 700__ $$aJacobsson, R 002909524 700__ $$aJeangros, H 002909524 700__ $$aKamiscioglu, C 002909524 700__ $$aKauniskangas, A M 002909524 700__ $$aKhalikov, E 002909524 700__ $$aKim, S H 002909524 700__ $$aKim, Y G 002909524 700__ $$aKlioutchnikov, G 002909524 700__ $$aKomatsu, M 002909524 700__ $$aKonovalova, N 002909524 700__ $$aKuleshov, S 002909524 700__ $$aKrzempek, L 002909524 700__ $$aLacker, H M 002909524 700__ $$aLantwin, O 002909524 700__ $$aLasagni Manghi, F 002909524 700__ $$aLauria, A 002909524 700__ $$aLee, K Y 002909524 700__ $$aLee, K S 002909524 700__ $$aLelong, P 002909524 700__ $$aLerner, G 002909524 700__ $$aLo Meo, S 002909524 700__ $$aLoschiavo, V P 002909524 700__ $$aMarcellini, S 002909524 700__ $$aMargiotta, A 002909524 700__ $$aMarion, A -P 002909524 700__ $$aMascellani, A 002909524 700__ $$aMei, F 002909524 700__ $$aMiano, A 002909524 700__ $$aMikulenko, A 002909524 700__ $$aMontesi, M C 002909524 700__ $$aNavarria, F L 002909524 700__ $$aNuntiyakul, W 002909524 700__ $$aOgawa, S 002909524 700__ $$aOkateva, N 002909524 700__ $$aOsborne, J 002909524 700__ $$aOvchynnikov, M 002909524 700__ $$aPaggi, G 002909524 700__ $$aPal, K 002909524 700__ $$aPanigoni, J 002909524 700__ $$aPark, B D 002909524 700__ $$aPasseggio, G 002909524 700__ $$aPazzini, J 002909524 700__ $$aPelletier, S 002909524 700__ $$aPerez Ornedo, M 002909524 700__ $$aPerrotta, A 002909524 700__ $$aPodgrudkov, D 002909524 700__ $$aPolukhina, N 002909524 700__ $$aProta, A 002909524 700__ $$aProuteau, O 002909524 700__ $$aQuercia, A 002909524 700__ $$aRamos, S 002909524 700__ $$aReghunath, A 002909524 700__ $$aRoganova, T 002909524 700__ $$aRonchetti, F 002909524 700__ $$aRottoli, L 002909524 700__ $$aRovelli, T 002909524 700__ $$aRuchayskiy, O 002909524 700__ $$aRuf, T 002909524 700__ $$aSabate Gilarte, M 002909524 700__ $$aSadykov, Z 002909524 700__ $$aSamoilov, M 002909524 700__ $$aSanchez Galan , F 002909524 700__ $$aScalera, V 002909524 700__ $$aSchmidt-Parzefall, W 002909524 700__ $$aSchneider, O 002909524 700__ $$aSekhniaidze, G 002909524 700__ $$aSerra, N 002909524 700__ $$aShaposhnikov, M 002909524 700__ $$aShevchenko, V 002909524 700__ $$aShchedrina, T 002909524 700__ $$aShchutska, L 002909524 700__ $$aShibuya, H 002909524 700__ $$aSiroli, G P 002909524 700__ $$aSirri, G 002909524 700__ $$aSoares, G 002909524 700__ $$aSohn, J Y 002909524 700__ $$aSoto Sandoval, O J 002909524 700__ $$aSpurio, M 002909524 700__ $$aStarkov, N 002909524 700__ $$aSteggemann, J 002909524 700__ $$aSzewczyk, M 002909524 700__ $$aTimiryasov, I 002909524 700__ $$aTioukov, V 002909524 700__ $$aTramontano, F 002909524 700__ $$aTrippl, C 002909524 700__ $$aUluwita, A 002909524 700__ $$aUrsov, E 002909524 700__ $$aUstyuzhanin, A 002909524 700__ $$aVankova-Kirilova, G 002909524 700__ $$aVasquez, G 002909524 700__ $$aVendeuvre, C 002909524 700__ $$aVerguilov, V 002909524 700__ $$aViegas Guerreiro Leonardo, N 002909524 700__ $$aVilela, C 002909524 700__ $$aVisone, C 002909524 700__ $$aWanke, R 002909524 700__ $$aYaman, E 002909524 700__ $$aYang, Z 002909524 700__ $$aYazici, C 002909524 700__ $$aYoon, C S 002909524 700__ $$aZaffaroni, E 002909524 700__ $$aZamora Saa, J 002909524 700__ $$aZanetti, M 002909524 710__ $$aCERN. Geneva. The LHC experiments Committee 002909524 710__ $$aLHCC 002909524 710__ $$5PH 002909524 787__ $$iLetter of Intent$$rLHCC-I-040 002909524 859__ [email protected] 002909524 8564_ $$uhttps://cds.cern.ch/record/2895224$$yOriginal Document (LHCC-I-040) 002909524 8564_ $$82555978$$s2979892$$uhttps://cds.cern.ch/record/2909524/files/LHCC-I-040-ADD-1.pdf 002909524 8564_ $$82555978$$s78555$$uhttps://cds.cern.ch/record/2909524/files/LHCC-I-040-ADD-1.jpg?subformat=icon-180$$xicon-180 002909524 903__ $$spublic 002909524 905__ $$aUniversity of Naples "Federico II"[email protected]$$pDe Lellis, Giovanni 002909524 905__ [email protected]$$pJacobsson, Richard 002909524 906__ [email protected]$$pFunk, Wolfgang 002909524 916__ $$sn$$w202437 002909524 960__ $$a16 002909524 963__ $$aPUBLIC 002909524 970__ $$a000784006CER 002909524 980__ $$aSCICOMMPUBLLHCC 002909524 980__ $$aNote