ICAP2012 - List of Authors (Assmann, R.W.)

Paper

Title

Page

Automatic Computer Algorithms for Beam-based Setup of the LHC Collimators

15

G. Valentino, N.J. Sammut
University of Malta, Information and Communication Technology, Msida, Malta
R.W. Aßmann, R. Bruce, S. Redaelli, B. Salvachua, D. Wollmann
CERN, Geneva, Switzerland

Funding: FP7 EuCARD - WP8 ColMat
Beam-based setup of the LHC collimators is necessary to establish the beam centers and beam sizes at the collimator locations and determine the operational settings during various stages of the LHC machine cycle. Automatic software algorithms have been successful in reducing the costly beam time required for the alignment, as well as significantly reducing human error. In this paper, the beam-based alignment procedure is described, and the design of algorithms such as a BLM feedback loop, parallel collimator alignment, pattern recognition of BLM loss spikes, automatic loss threshold selection and coarse BPM-interpolation guided alignment is explained. A comparison on the alignment results from the 2010 to the 2012 LHC runs is presented to illustrate the improvements achieved with the automatic algorithms.

Slides MOSBI1 [10.572 MB]

WESAI1

Advanced Modeling and Measurements of LHC Beam Halo and Collimation

R.W. Aßmann
CERN, Geneva, Switzerland

The Large Hadron Collider at CERN has an advanced beam cleaning system, which relies on about 100 collimators with various material and orientations. This system constrains the beam phase space in such a way that any stray protons or ions in the LHC are intercepted and efficiently absorbed at collimators, thus protecting the super-conducting magnets against any direct beam loss. The allowed leakage from the collimators is less than 0.002% of the impacting load. The numerical methods used in the design of the system are presented. It is shown that the measured performance agrees very well with the expectations and design goals.

Slides WESAI1 [14.192 MB]

Paper	Title	Page
MOSBI1	Automatic Computer Algorithms for Beam-based Setup of the LHC Collimators	15
	G. Valentino, N.J. Sammut University of Malta, Information and Communication Technology, Msida, Malta R.W. Aßmann, R. Bruce, S. Redaelli, B. Salvachua, D. Wollmann CERN, Geneva, Switzerland
	Funding: FP7 EuCARD - WP8 ColMat Beam-based setup of the LHC collimators is necessary to establish the beam centers and beam sizes at the collimator locations and determine the operational settings during various stages of the LHC machine cycle. Automatic software algorithms have been successful in reducing the costly beam time required for the alignment, as well as significantly reducing human error. In this paper, the beam-based alignment procedure is described, and the design of algorithms such as a BLM feedback loop, parallel collimator alignment, pattern recognition of BLM loss spikes, automatic loss threshold selection and coarse BPM-interpolation guided alignment is explained. A comparison on the alignment results from the 2010 to the 2012 LHC runs is presented to illustrate the improvements achieved with the automatic algorithms.
	Slides MOSBI1 [10.572 MB]

WESAI1	Advanced Modeling and Measurements of LHC Beam Halo and Collimation
	R.W. Aßmann CERN, Geneva, Switzerland
	The Large Hadron Collider at CERN has an advanced beam cleaning system, which relies on about 100 collimators with various material and orientations. This system constrains the beam phase space in such a way that any stray protons or ions in the LHC are intercepted and efficiently absorbed at collimators, thus protecting the super-conducting magnets against any direct beam loss. The allowed leakage from the collimators is less than 0.002% of the impacting load. The numerical methods used in the design of the system are presented. It is shown that the measured performance agrees very well with the expectations and design goals.
	Slides WESAI1 [14.192 MB]