10th LHC Operations "Evian" Workshop

Session

Session 2

23 Nov 2021, 14:00

500/1-001 - Main Auditorium (CERN)

Conveners

Session 2: Systems Overview

• Delphine Jacquet (CERN)
• Andrea Calia (CERN)

Session 2: Systems Overview

• Andrea Calia (CERN)
• Delphine Jacquet (CERN)

Session 2: Systems Overview

• Andrea Calia (CERN)
• Delphine Jacquet (CERN)

Presentation materials

Evian session 2 Main points.pdf

4. Injection (20' + 10')

Yann Dutheil (CERN)

23/11/2021, 14:00

During the LS2, major upgrades to the injection protection system were implemented. In particular with the replacement of TDI, new TCDIL, new TCLIA and a new optics of the TI8 transferline. The impact of those changes on beam commissioning and operation will be addressed in this contribution.
Recent updates to the IQC and the prospects of beam steering with high intensity trains will also be...

9. TDE (20' + 5')

Marco Calviani (CERN)

23/11/2021, 14:30

Two 6-t beam dumps, made of a graphite core encapsulated in a stainless steel vessel, are employed to absorb the energy of the two Large Hadron Collider (LHC) intense proton beams during operation. Operational issues started to appear in 2015 during LHC Run 2 (2014-2018) as a consequence of the progressive increase of the LHC beam kinetic energy, requiring technical interventions in the highly...

43. LHC Beam vacuum dump windows upgrade (10' + 5')

Giuseppe Bregliozzi (CERN)

23/11/2021, 14:55

An overview of the existing LHC beam dump vacuum window is presented, and its main limitations are discussed. The new design is then introduced and its compatibility with the HL-LHC beam parameters is analysed. Improvement in reliability, operation flexibility, spare strategy and possible replacement scenario during operation run will also be detailed. Finally, the status of the installation...

10. Collimation system (20' + 10')

Gabriella Azzopardi (CERN)

23/11/2021, 15:10

The LHC relies on a complex collimation system to protect against unavoidable beam losses and to minimize the risk of quenching the superconducting magnets. During LS2, 16 new collimators were installed to improve the system's performance in various aspects. In addition, 2 new crystal collimators are planned for installation in the YETS2021. This presentation will provide a status report of...

12. BI feedbacks (20' + 10')

Andrea Calia (CERN)

23/11/2021, 16:10

The Tune & Orbit Feedback system has been heavily renovated during LS2 based on the experience gained over the Run2 of the LHC. In the first part of this presentation, the hardware, software and operational changes will be presented.
Given that Tune & Orbit Feedback is one of the key systems of the LHC, extensive testing has been performed to validate the new software requirements. These...

38. Beam Instrumentation (20' + 10')

Mr Mathieu Saccani (CERN)

23/11/2021, 16:40

During the LHC second long shutdown (LS2), most of the beam instruments in the LHC were updated and consolidated to cope with the higher brightness and intensity of the injected beams and prepare for the future High-Luminosity LHC. An overview on the major hardware and software changes carried out through LS2 is given, highlighting the first results achieved during the 2021 pilot beam tests...

11. ADT & ObsBox (20' + 10')

Martin Soderen (CERN)

23/11/2021, 17:10

During LS2, ADT and ADTObsBox have received a substantial upgrade. New low noise BPM electronics were
developed and successfully tested with beam in October 2021 in the LHC. Power amplifiers in the tunnel underwent
maintenance and were equipped with new tetrodes. The ADTObsBox has been completely redesigned using state of the
art computing hardware and new low and high level software....

13. Controls (20' + 10')

Philip Elson (CERN)

24/11/2021, 09:00

This presentation will look at some of the more significant software changes to the control system since the end of Run 2, and will provide bigger-picture motivation and strategy around them.
Topics will include development languages and tools, the evolving GUI strategy, the new logging service (NXCALS) and the refresh of the post-mortem system.
There will be a reflection on the implications...

5. LBDS (20' + 10')

Viliam Senaj (CERN)

24/11/2021, 09:30

Modification of LBDS during LS2 aimed increasing of the beam dump system reliability in several ways: 1. upgrade of HV switch insulator design to reduce sparking probability; 2. increasing capacitance of energy storage capacitors resulting in reduced nominal voltages on generators and on magnets; 3. replacement of SEB sensitive HV semiconductor switches by less sensitive ones; 4. modification...

35. RF (20' + 10')

Helga Timko (CERN)

24/11/2021, 10:00

A brief summary of system changes during LS2 is given, with emphasis on the exchange of cryo-module 2B1. Based on the experience with 2021 recommissioning and the pilot test run, lessons learned are analyzed and the plan for 2022 commissioning is presented. Estimated beam and RF parameters are presented for Run III, for different intensity regimes, and necessary changes in operational working...

3. Relevant changes to the LHC powering system during LS2 (20' + 5')

Dr Emmanuele Ravaioli (CERN)

HW changes (DISMAC, magnet changes, equipment changes) - and if not treated elsewhere: HWC, pre-cycle, thresholds, GPM functionality and EE bypass