CERN Accelerating science

Report
Report number	CERN-2015-002 ; CERN-ATS-2015-002
Conference title	Chamonix 2014: LHC Performance Workshop
Related conference title(s)	Chamonix 2014
Date(s), location	22 - 25 Sep 2014, Chamonix, France
Editor(s)	Draper, M (ed.) (CERN)
Imprint	Geneva : CERN, 2015 - 293 p.
Series	(CERN Yellow Reports: Conference Proceedings)
Note	Organiser: Frédérick Bordry, Frank Zimmermann
ISBN	9789290834137 (print version, paperback)
DOI	e-proceedings: 10.5170/CERN-2015-002
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC
Abstract	During the Chamonix 2014 workshop on LHC performance, operation of the machine in 2012, activities during the first long shutdown LS1 aiming at peparing for operation at 7 TeV per beam and substantial long term upgrades of both the injector chain and the LHC have been discussed. After a session dedicated to observations and lessons from the run 2011, strategies for the run 2012 have been discussed in order to optimize the machine performance and, in particular, the maximum and integrated luminosity provided to the main experiments. Two session were dedicated to the preparation of the first long shutdown LS1 followed by a session aiming at optimizing the perfromance to be expected after this first shutdown. The last two session of the workshop were dedicated to substantial upgrades of the injector complex and the LHC aiming at increasing the integrated luminosity to 250 inverse femtobarn per year after implementation in a second long shutdown. Improvements of the injector complex comprise increased injection energies in the PS Booster and the PS, an upgrade of the SPS vacuum chamber to alleviate limitations due to electron cloud build up and many more upgrades required for the generation of beams with higher brightness and smaller meittances than possible with the present machines. Plans for the LHC comprise an upgrade of the interaction regions to allow for a smaller beta*, crab cavities for luminosity levelling and, upgrades of the collimation and other systems.
Copyright/License	publication: © 2015-2024 CERN (License: CC-BY-4.0)

Corresponding record in: Inspire
Contributions in Inspire: C14-09-22.6
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Contributions to this conference in CDS

Chamonix 2014 Conclusions: Main Points and Actions (p. 1)

by Bordry, F

Summary of Session 1: LS1, HW Commissioning, Powering Tests - Coming out of LS1 (p. 7)

by Pojer, M

Summary of Session 2: Injector Status and Beams for LHC, Dry Runs, Sector Tests with Beam (p. 10)

by Steerenberg, R

Summary of Session 3: 2015 Commissioning with Beam (p. 13)

by Lamont, M

Summary of Session 4: LHC: Challenges and Strategy for Run 2 (p. 16)

by Salvachua, B

Summary of Session 5: LIU (p. 21)

by Meddahi, M

Summary of Session 6: HL-LHC (p. 27)

by Brüning, O S

Summary of Session 7: Accelerator and non-LHC Experimental Areas Consolidation up to LS3 (p. 31)

by Benedikt, M

Summary of Session 8: Long Shutdown 2 Strategy and Preparation (p. 33)

by Jimenez, J

Non-conformities (solved and pending) on the Superconducting Circuits (p. 39)

by Verweij, A

Re-commissioning of the Superconducting Circuits (p. 44)

by Solfaroli Camillocci, M

Other Non-solved Non-conformities across the LHC Ring and Potential Impact on Performance (p. 47)

by Baglin, V

Expected Impact of Hardware Changes on Impedance and Beam-induced Heating during Run 2 (p. 53)

by Salvant, B

ADT and RF after LS1 (p. 60)

by Butterworth, A

LBDS and Kickers after LS1 (p. 65)

by Bartmann, W

LHC Injectors Complex Status (p. 71)

by Hanke, K

SPS Scrubbing Run in 2014 (p. 76)

by Bartosik, H

Operational Beams for the LHC (p. 80)

by Papaphilippou, Y

LHC Dry-Runs and Machine Check-out (p. 85)

by Jacquet, D

LHC Transfer Line and Sector Tests (p. 89)

by Kain, V

2015 Commissioning with Beam - Introduction (p. 93)

by Lamont, M

Experiments’ Expectations for 2015 (p. 96)

by Gorini, B

Baseline LHC machine parameters and configuration of the 2015 proton run (p. 100)

by Bruce, R.

Optics Options for the 2015 LHC Run (p. 107)

by Giovannozzi, M

Nominal Cycle and Options (p. 111)

by Solfaroli Camillocci, M

Scrubbing: Expectations and Strategy, Long Range Perspective (p. 114)

by Iadarola, G

Strategy for First Two Months of LHC Beam Commissioning (Commissioning to First Stable Beams) (p. 125)

by Redaelli, S

Overall Strategy for Run 2 (p. 129)

by Wenninger, J

Machine Protection Strategy for LHC Commissioning and Outlook for Future Challenges (p. 134)

by Salvachua, B

Machine Development Priorities (p. 138)

by Uythoven, J

BLM Threshold Strategy (UFOs and Quenches) (p. 143)

by Auchmann, B

R2E and Availability (p. 149)

by Brugger, M

Linac4: Progress on Hardware and Beam Commissioning (p. 161)

by Lombardi, A M

Protons: Baseline and Alternatives, Studies Plan (p. 166)

by Rumolo, G

Concerns with Low Emittance Beam Operation (p. 176)

by Kain, V

Other Means to increase the SPS 25ns Performance - Transverse Plane (p. 180)

by Bartosik, H

Other Means to Increase the SPS 25ns Performance - Longitudinal Plane (p. 185)

by Argyropoulos, T

Ions: Baseline, Studies Plan and Strategy for Pending Options (p. 192)

by Bodendorfer, M

HL-LHC Parameter and Layout Baseline (p. 198)

by Fessia, P

HL-LHC Magnet Roadmap (p. 202)

by Todesco, E

HL-LHC RF Roadmap (p. 209)

by Calaga, R

HL-LHC Alternative Scenarios (p. 217)

by Tomás, R

Collimation Upgrades for HL-LHC (p. 225)

by Redaelli, S

Down Selection Criteria and MDs Prior to LS3 (p. 232)

by Arduini, G

Linacs Consolidation (p. 239)

by Scrivens, R

PSB and PS Consolidation For LS2 and Beyond (p. 243)

by Gilardoni, S

SPS Consolidation for LS2 and Beyond (p. 249)

by Ridewood, J

AD and LEIR Consolidation (p. 257)

by Eriksson, T

North Area and East Area Consolidation (p. 261)

by Efthymiopoulos, I

Isolde and n_Tof Consolidation (p. 265)

by Catherall, R

Scope of the Long Shutdown 2 (optimisation of the period 2015-2018) (p. 270)

by Jimenez, J M

What has been Learnt from LS1 (p. 272)

by Foraz, K

Radiation Protection Aspects (p. 276)

by Forkel-Wirth, D

LIU Planned Activities (p. 281)

by Chapochnikova, E

HL-LHC Planned Activities during LS2 - Accelerator (p. 284)

by Béjar Alonso, I

LHC Experiments Upgrade and Maintenance (p. 288)

by Riegler, W

Long Shutdown 2 @ LHC (p. 290)

by Bernardini, M

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