JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF
AU - Hernalsteens, C.
AU - Lindström, B.
AU - Ravaioli, E.
AU - Tuormaa, O.K.
AU - Villén Basco, M.
AU - Wiesner, C.
AU - Wollmann, D.
ED - Zimmermann, Frank
ED - Tanaka, Hitoshi
ED - Sudmuang, Porntip
ED - Klysubun, Prapong
ED - Sunwong, Prapaiwan
ED - Chanwattana, Thakonwat
ED - Petit-Jean-Genaz, Christine
ED - Schaa, Volker R.W.
TI - Effect of a Spurious CLIQ Firing on the Circulating Beam in HL-LHC
J2 - Proc. of IPAC2022, Bangkok, Thailand, 12-17 June 2022
CY - Bangkok, Thailand
T2 - International Particle Accelerator Conference
T3 - 13
LA - english
AB - The High Luminosity LHC (HL-LHC) will reach a nominal, levelled luminosity of §I{5e34}{\per\cm\square\per\second} and a stored energy of nearly §I{700}{MJ} in each of the two proton beams. The new large-aperture final focusing Nb₃Sn quadrupole magnets in IR1 and IR5, which are essential to achieve the luminosity target, will be protected using the novel Coupling Loss Induced Quench (CLIQ) system. A spurious discharge of a CLIQ unit will impact the circulating beam through higher order multipolar field components that develop rapidly over a few turns. This paper reports on dedicated beam tracking studies performed to evaluate the criticality of this failure on the HL-LHC beam. Simulations for different machine and optics configurations show that the beam losses reach a critical level after only five machine turns following the spurious CLIQ trigger, which is much faster than assumed in previous simulations that did not consider the higher order multipolar fields. Machine protection requirements using a dedicated interlock to mitigate this failure are discussed.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 1862
EP - 1865
KW - beam-losses
KW - luminosity
KW - simulation
KW - collimation
KW - collider
DA - 2022/07
PY - 2022
SN - 2673-5490
SN - 978-3-95450-227-1
DO - doi:10.18429/JACoW-IPAC2022-WEPOPT013
UR - https://jacow.org/ipac2022/papers/wepopt013.pdf
ER -