Institutionen för fysik och astronomi

Seminarium: Detection and Analysis of Uncontrolled Beam Loss in the High Luminosity LHC

PhD start seminar. Björn will outline his thesis plan in the field of accelerator physics.

For the HL-LHC era the magnets in the high luminosity interaction regions of IR1 and 5 will be replaced to allow for an increase of peak luminosity by a factor of 5 to 7.5 compared to the LHC design value of 1x10^34cm^-2s^-1. In addition the bunch intensity will be increased. Therefore, the stored beam energy will increase to above 700MJ per beam, which is a factor two more than the nominal LHC. An uncontrolled beam loss could then cause even more severe damage to accelerator equipment. With today’s nominal parameters the beam could already penetrate fully through a 20 m long block of copper, if it is accidentally entirely deflected. The PhD project consists of studying fast failures due to powering failures (quenches etc.) in the new HL-LHC magnets (triplet, D1, D2, Q4 and Q5) and the new beam optics, their time scales and their impact on the trajectory of the particle beams. Taking into account the damage limits of the passive protection elements (collimators) and other accelerator equipment, direct and indirect failure detection methods and interlock systems based on the ones existing in the LHC will be studied and proposed. In addition, it will be studied how the time between failure detection and actual beam dump can be reduced to limit the damage potential. The layout of a novel detection system to detect fast failures based on very fast beam loss detectors will be studied and proof of principle experiments with beam will be performed at the LHC using the existing diamond particle detectors installed in the betatron collimation region (IR7).