Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1'

Friday 15 Mar 2013, 08:30 → 15:20 Europe/Zurich

874/1-011 (CERN)

Ralph Steinhagen (CERN), Wolfgang Hofle (CERN)

This review focuses on transverse beam instability diagnostic systems, in particular the bunch-by-bunch feedbacks, intra-bunch (i.e. head-tail & TMCI) and Q/Q' diagnostics. The aim is to provide a first step in establishing a common understanding of what is needed, what could be useful for day-to-day operation, what could be delivered with the given resources, and to discuss and draft a recommendation of a targeted base-line after LS1.

Review Summary Tentative summary of the review

1 Introduction and Mandate

Speaker: Wolfgang Hofle (CERN)

Slides Instability_review_introduction.pdf Instability_review_introduction.pptx

2 What could be useful after LS1 -- an OP perspective

Review of existing systems and how they could be better integrated to aid day-to-day machine operation and handling (online diagnostics, post-mortem, pre-analysis of which parameter to tune etc.). Impact of instabilities on machine operation and LHC luminosity performance.

Speaker: Dr Jorg Wenninger (CERN)

Slides Q-Instability.Rev.OP.pdf Q-Instability.Rev.OP.pptx

3 What is needed after LS1 -- an ABP perspective

Review of transverse instabilities already observed and expected with operation at increased beam energy and intensities after LS1, and functional requirements on diagnostics systems to better understand and cure these instabilities. Impact of instabilities on machine operation and LHC luminosity performance.

Speakers: Benoit Salvant (CERN), Dr Tatiana Pieloni (CERN)

Slides LHC_BI_review4.pdf LHC_BI_review4.pptx

09:45 discussion

10:00 discussion - short coffee break

4 What could be delivered -- RF

Summary of planned upgrades to the existing bunch-by-bunch feedback system for after LS1. Integration into Q/Q' diagnostic & FB infrastructure. Future options for after LS2. Required resources and time-line.

Speaker: Dr Daniel Valuch (CERN)

Slides ADT_RalphWorkshop.pdf ADT_RalphWorkshop.pptx

5 What could be delivered -- BI

Status and limitations of existing intra-bunch diagnostics systems. Summary of the proof-of-concept tests performed with beam in 2012 and potential application after LS1. Potential upgrades after LS2. Required resources and time-line.

Speaker: Dr Ralph Steinhagen (CERN)

Slides 2013-03-15_LHC_Instabability_Diag_Review.pdf

6 Event Synchronisation and Logging Infrastructure - CO

Review options for synchronisation to propagate the information about an instability across the accelerator, the latency of the current mechanisms in the timing system.

Speakers: Javier Serrano (CERN), Jean-Claude Bau (CERN)

Slides sync_beam_inst.pdf

7 Data storage, Post-processing and Visualisation Infrastructure - CO

Summary of the present system and upgrade plans during LS1 related to data storage, post-processing and visualisation infrastructure.

Speaker: Chris Roderick (CERN)

Slides BECO_DataStorage_Etc_LHC_Transverse_Instability_Diagnostics_after_LS1.pdf

11:45 discussion

12:15 lunch break

8 Summary and Recommendation

round table with stake holders -- discussion and initial recommendation.

Speaker: Gianluigi Arduini (CERN)

Slides Discussion_20130315.pptx