Development of an abort gap monitor for the large hadroncollider

Conference · Thu Jul 01 04:00:00 EDT 2004

OSTI ID:860471

Beche, J -F; Byrd, J; De Santis, S; Placidi, M; Turner, W; Zolotorev, M

The Large Hadron Collider (LHC), presently under construction at CERN, requires monitoring the parasitic charge in the 3.3ms long gap in the machine fill structure. This gap, referred to as the abort gap, corresponds to the raise time of the abort kickers magnets. Any circulating particle present in the abort gap at the time of the kickers firing is lost inside the ring, rather than in the beam dump, and can potentially damage a number of the LHC components. CERN specifications indicate a linear density of 6 x 106 protons over a 100 ns interval as the maximum charge safely allowed to accumulate in the abort gap at 7 TeV. We present a study of an abort gap monitor, based on a photomultiplier tube with a gated microchannel plate, which would allow for detecting such low charge densities by monitoring the synchrotron radiation emitted in the dedicated diagnostics port. We show results of beam test experiments at the Advanced Light Source (ALS) using a Hamamatsu 5961U MCP-PMT, which indicate that such an instrument has the required sensitivity to meet LHC specifications.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of High EnergyPhysics
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 860471
• Report Number(s): LBNL--55208; BnR: KA1102053
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ADVANCED LIGHT SOURCE
BEAM DUMPS
CERN
CONSTRUCTION
HADRONS
Large Hadron Collider Beam Instrumentation MachineProtection
MAGNETS
MONITORING
MONITORS
PHOTOMULTIPLIERS
PROTONS
SENSITIVITY
SPECIFICATIONS
SYNCHROTRON RADIATION