2021-01-28
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Perspectives for quarkonium studies at the high-luminosity LHC
/ Chapon, Emilien (Beijing, Inst. High Energy Phys.) ; d'Enterria, David (CERN) ; Ducloue, Bertrand (Edinburgh U.) ; Echevarria, Miguel G. (Alcala de Henares U.) ; Gossiaux, Pol-Bernard (SUBATECH, Nantes) ; Kartvelishvili, Vato (Lancaster U.) ; Kasemets, Tomas (U. Mainz, PRISMA) ; Lansberg, Jean-Philippe (IJCLab, Orsay) ; McNulty, Ronan (University Coll., Dublin) ; Price, Darren D. (Manchester U.) et al.
We review the prospects for quarkonium-production studies in proton and nuclear collisions accessible during the upcoming phases of the CERN Large Hadron Collider operation after 2021, including the ultimate high-luminosity phase, with increased luminosities compared to LHC Runs 1 and 2. [...]
arXiv:2012.14161 ; MIT-CTP/5231 ; JLAB-THY-20-3240.
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115 p.
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2021-01-28
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2021-01-28
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High-resolution laser spectroscopy of $^{27-32}$Al
/ Heylen, H. (CERN ; Leuven U. ; Heidelberg, Max Planck Inst.) ; Devlin, C.S. (Liverpool U.) ; Gins, W. (Leuven U. ; Jyvaskyla U.) ; Bissell, M.L. (Manchester U.) ; Blaum, K. (Heidelberg, Max Planck Inst.) ; Cheal, B. (Liverpool U.) ; Filippin, L. (Brussels U.) ; Garcia Ruiz, R.F. (CERN ; Manchester U.) ; Godefroid, M. (Brussels U.) ; Gorges, C. (Darmstadt, Tech. U.) et al.
Hyperfine spectra of $^\text{27-32}$Al ($Z=13$) have been measured at the ISOLDE-CERN facility via collinear laser spectroscopy using the $3s^23p\ ^2\text{P}^\text{o} _{3/2}\rightarrow 3s^24s\ ^2\text{S}_{1/2}$ atomic transition. [...]
arXiv:2010.06918.
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10 p.
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2021-01-27
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2021-01-27
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2021-01-27
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Chapter 2: Machine layout and performance
/ Arduini, G (CERN) ; Bruce, R (CERN) ; De Maria, R (CERN) ; Giovannozzi, M (CERN) ; Iadarola, G (CERN) ; Jowett, J (CERN) ; Métral, E (CERN) ; Papaphilippou, Y (CERN) ; Garcia, R Tomás (CERN)
The goal of the High-luminosity upgrade of the LHC is to deliver an integrated luminosity of at least 250 fb-1 per year (assuming at least 160 days of operation at high-luminosity) in each of the two high-luminosity general-purpose detectors, ATLAS and CMS, located at the interaction points (IP) 1 and 5, respectively. [...]
2020. - 30 p.
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2021-01-27
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Chapter 3: Insertion Magnets
/ Todesco, E (CERN) ; Ferracin, P (CERN)
In general, magnets will be tested individually in a vertical test station, and then horizontally in the final cold mass assembly within the final cryostat, with the exception of Q2 and D2 whose length does not allow vertical testing. [...]
2020. - 18 p.
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Chapter 4: RF systems
/ Calaga, R (CERN) ; Baudrenghien, P (CERN) ; Capatina, Ofelia (CERN) ; Jensen, Erk (CERN) ; Montesinos, Eric (CERN)
The HL-LHC beams are injected, accelerated, and stored to their nominal energy of 7 TeV by the existing 400 MHz superconducting RF system of the LHC.
A novel superconducting RF system consisting of eight cavities per beam for transverse deflection (aka crab cavities) of the bunches will be used to compensate the geometric loss in luminosity due to the non-zero crossing angle and the extreme focusing of the bunches in the HL-LHC.
Due to doubling of the beam currents in the HL-LHC era, an optimal detuning scheme (aka full- detuning) is required to cope with the transient beam loading effects. [...]
2020. - 22 p.
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