Optics Measurements, Corrections and Modeling for High-Performance Storage Rings

Session

Techniques review - I

21 Jun 2011, 09:00

6/2-024 - BE Auditorium Meyrin (CERN)

Conveners

Techniques review - I

• James Safranek (SLAC)

Description

1. Merits of the different techniques
2. Do the available techniques match the future challenges?
3. Could LOCO be applied to the LHC as for light sources?

35. LOCO for LHC

Kajetan Fuchsberger

21/06/2011, 09:00

The LOCO principle is based on measuring orbit corrector responses and fitting numerical models to the measured data. This principle is very well known and successfully applied in many fields. To be prepared for the commissioning of the LHC and its transfer lines, a dedicated software project, Aloha (Another Linear Optics Helper Application), was launched to cover the requirements for the LHC:...

36. Optics Diagnostics with AC Dipoles (CANCELLED)

Ryoichi Miyamoto (Brookhaven National Laboratory)

21/06/2011, 09:20

An AC dipole is an exciter of a beam bunch for optics measurements based on observation of turn-by-turn orbits with beam position monitors. By driving the bunch with a sinusoidally oscillating dipole magnetic field, whose frequency is close to betatron frequency and amplitude is adiabatically ramped up and down, the AC dipole can produce a sustained large oscillation with almost no emittance...

38. Action-Phase analysis

Javier Fernando Cardona (Departamento de Fisica-Universidad Nacional de Colombia)

21/06/2011, 09:40

Action and phase analysis on turn by turn BPM data in the LHC show visible variation of action and phase variables in the LHC interaction regions. Linear optic errors are deduced from these quantities. Local skew quadrupole correctors and quadrupole triplets at each interaction region can be set according to such error estimations. This work show the procedure to establish the relationship...

40. Model-Independent Analysis of Turn-by-Turn BPM Measurements in Storage Rings

Alexey Petrenko

21/06/2011, 10:00

Coherent transverse beam oscillations in the Tevatron were analyzed with the Model-Independent Analysis (MIA) technique. This allowed to obtain the model-independent values of coupled betatron amplitudes, phase advances and dispersion function around the ring from a single kick measurement. In order to solve the MIA mode mixing problem a new criterion of betatron mode independence was...