A laser-based longitudinal density monitor for the large hadroncollider

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

OSTI ID:860472

Beche, J -F; Byrd, J; Datte, P; De Santis, S; Placidi, M; Riot, V; Schoenlein, R; Turner, W; Zolotorev, M

We report on the development of an instrument for the measurement of the longitudinal beam profile in the Large Hadron Collider (LHC). The technique used, which has been successfully demonstrated at the Advanced Light Source, mixes the synchrotron radiation with the light from a mode-locked solid state laser oscillator in a non-linear crystal.The up-converted radiation is then detected with a photomultiplier and processed to extract, store and display the required information. A 40MHz laser, phase-locked to the ring radio frequency system, with a 50 pspulse length, would be suitable for measuring the dynamics of the core of each of the LHC 2808 bunches in a time span much shorter than the synchrotron period. The same instrument could also monitor the evolution of the bunch tails, the presence of untrapped particles and their diffusion into nominally empty RF buckets (''ghost bunches'') as required by the CERN 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: 860472
• Report Number(s): LBNL--55209; BnR: KA1102053
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ADVANCED LIGHT SOURCE
BEAM PROFILES
CERN
DIFFUSION
HADRONS
Large Hadron Collider Beam Instrumentation
MONITORS
OSCILLATORS
PHOTOMULTIPLIERS
RADIATIONS
SOLID STATE LASERS
SPECIFICATIONS
SYNCHROTRON RADIATION
SYNCHROTRONS