M2 beam line

Target entity: M2 beam line
Context triple: [COMPASS, basedAt, M2 beam line]

• A. Linac2
  Linac2 was CERN’s long-serving linear accelerator that pre-accelerated protons for injection into the Proton Synchrotron Booster and the rest of the accelerator complex before being superseded by Linac4.
• B. Linac4
  Linac4 is a linear accelerator at CERN that serves as the first stage of the proton acceleration chain for the Large Hadron Collider and other experiments.
• C. LHC injector chain
  The LHC injector chain is the sequence of accelerators and beamlines at CERN that progressively boost and prepare particle beams before they are injected into the Large Hadron Collider.
• D. LHC Injectors Upgrade (LIU)
  The LHC Injectors Upgrade (LIU) is a major CERN project to modernize and enhance the performance of the accelerator chain feeding the Large Hadron Collider, enabling higher beam intensities and luminosities for future physics runs.
• E. Compact Linear Collider test facilities
  The Compact Linear Collider test facilities are experimental research installations at CERN dedicated to developing and validating technologies for a future high-energy electron–positron linear collider.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: M2 beam line
Target entity description: M2 beam line is a high-energy particle beam facility at CERN’s Super Proton Synchrotron used to deliver intense hadron and muon beams for fixed-target experiments such as COMPASS.

• A. Linac2
  Linac2 was CERN’s long-serving linear accelerator that pre-accelerated protons for injection into the Proton Synchrotron Booster and the rest of the accelerator complex before being superseded by Linac4.
• B. Linac4
  Linac4 is a linear accelerator at CERN that serves as the first stage of the proton acceleration chain for the Large Hadron Collider and other experiments.
• C. LHC injector chain
  The LHC injector chain is the sequence of accelerators and beamlines at CERN that progressively boost and prepare particle beams before they are injected into the Large Hadron Collider.
• D. LHC Injectors Upgrade (LIU)
  The LHC Injectors Upgrade (LIU) is a major CERN project to modernize and enhance the performance of the accelerator chain feeding the Large Hadron Collider, enabling higher beam intensities and luminosities for future physics runs.
• E. Compact Linear Collider test facilities
  The Compact Linear Collider test facilities are experimental research installations at CERN dedicated to developing and validating technologies for a future high-energy electron–positron linear collider.
• F. None of above. chosen