Error localization in RHIC by fitting difference orbits
Abstract
The presence of realistic errors in an accelerator or in the model used to describe the accelerator are such that a measurement of the beam trajectory may deviate from prediction. Comparison of measurements to model can be used to detect such errors. To do so the initial conditions (phase space parameters at any point) must be determined which can be achieved by fitting the difference orbit compared to model prediction using only a few beam position measurements. Using these initial conditions, the fitted orbit can be propagated along the beam line based on the optics model. Measurement and model will agree up to the point of an error. The error source can be better localized by additionally fitting the difference orbit using downstream BPMs and back-propagating the solution. If one dominating error source exist in the machine, the fitted orbit will deviate from the difference orbit at the same point.
- Authors:
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
- Sponsoring Org.:
- USDOE SC OFFICE OF SCIENCE (SC)
- OSTI Identifier:
- 1049278
- Report Number(s):
- BNL-96750-2012-CP
R&D Project: KBCH139; 18035; KB0202011; TRN: US1204448
- DOE Contract Number:
- DE-AC02-98CH10886
- Resource Type:
- Conference
- Resource Relation:
- Conference: 2012 International Particle Accelerator Conference (IPAC 2012); New Orleans, LA; 20120520 through 20120525
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM POSITION; FORECASTING; OPTICS; relativistic heavy ion collider
Citation Formats
Liu, C, Minty, M, and Ptitsyn, V. Error localization in RHIC by fitting difference orbits. United States: N. p., 2012.
Web.
Liu, C, Minty, M, & Ptitsyn, V. Error localization in RHIC by fitting difference orbits. United States.
Liu, C, Minty, M, and Ptitsyn, V. 2012.
"Error localization in RHIC by fitting difference orbits". United States. https://www.osti.gov/servlets/purl/1049278.
@article{osti_1049278,
title = {Error localization in RHIC by fitting difference orbits},
author = {Liu, C and Minty, M and Ptitsyn, V},
abstractNote = {The presence of realistic errors in an accelerator or in the model used to describe the accelerator are such that a measurement of the beam trajectory may deviate from prediction. Comparison of measurements to model can be used to detect such errors. To do so the initial conditions (phase space parameters at any point) must be determined which can be achieved by fitting the difference orbit compared to model prediction using only a few beam position measurements. Using these initial conditions, the fitted orbit can be propagated along the beam line based on the optics model. Measurement and model will agree up to the point of an error. The error source can be better localized by additionally fitting the difference orbit using downstream BPMs and back-propagating the solution. If one dominating error source exist in the machine, the fitted orbit will deviate from the difference orbit at the same point.},
doi = {},
url = {https://www.osti.gov/biblio/1049278},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 20 00:00:00 EDT 2012},
month = {Sun May 20 00:00:00 EDT 2012}
}