Welcome talk

• Thibaut Lefevre (CERN)
• Rhodri Jones (CERN)

i. HL-LHC status ii. CERN Structural change overview

Cockroft collaboration

• Carsten Peter Welsch (Cockcroft Institute / University of Liverpool)

i. Status of the collaboration ii. Recruitment situation and plans, financial situation, main milestones iii. Foreseen publications for 2021

Review of actions from last meeting and objectives of the workshop

• Raymond Veness (CERN)

i. Review actions from March online meeting ii. Milestones for the project at CERN iii. Summary of future goals for the collaboration

2020 experimental results from Cockcroft (30min + 10min)

• Hao Zhang (University of Liverpool/Cockcroft Institute)
• Narender Kumar (University of Liverpool)
• Amir Salehilashkajani (Liverpool University)

a. 2020 Experimental results from Cockcroft (Hao, Amir, Narender 30min + 10min) i. Measurements performed in 2020 and program for 2021 on V2 1. Nozzle design 2. Alternative skimmer diameters and shape 3. Gas distribution simulations 4. Phosphor screen measurements ii. Design and procurement of BGC V3 parts by Cockcroft Institute (Hao) 1. Design 2. Procurement 3. Manufacturing 4. Controls system design 5. Assembly/testing iii. Commissioning plan for V3 at CI (Hao) 1. Performance evaluation of V3 instrument (Where, who, how) 2. Gas density in the IP 3. Plan for testing Neon and Nitrogen (and Ar?)

Matching results with simulations (10 min + 5)

• Marton Ady (CERN)

LHC Fluorescence measurements and Run 3 tests (20 min + 5)

• Stefano Mazzoni (CERN)

i. Present and 2021 activities ii. Status of LHC setup iii. Foreseen tests in HEL

Developments from GSI (15 min + 5)

• Serban Udrea (GSI Darmstadt)
• Peter Forck (GSI)

- Camera choice - Distortions related both to the presence of magnetic and electric fields and on properties of the gas jet curtain.

HEL test stand and HEL update (20 min + 10)

• Sergey Sadovich (CERN)
• Adriana Rossi (CERN)

i. Design and schedule for the HEL test stand (abstract) ii. Update on HEL and electron beam diameter iii. Update on e-lens parameters and interface iv. HEL test stand parameters v. Expected background light with foreseen blackening and light reducing orifices vi. BGC design in HEL test stand vii. BGC V3 operation: Foreseen time window, infrastructure space for racks and controls, pumps, power

Light estimation at the camera from cathode (10 min + 5)

• Noah Jens (Technische Hochschule Lubeck (DE))

i. Simulation results from lights reaching the camera from the e-gun on the HEL test stand and on the HEL

Test plan for BGC in HEL test stand

• Raymond Veness (CERN)

i. Planning ii. Manpower iii. Resources (Equipment, procedures etc.)

Online escape room challenge!

• Carsten Peter Welsch (Cockcroft Institute / University of Liverpool)
• Raymond Veness (CERN)

Team building event with online drinks. Details will follow.

LS2 BGC Installation & Integration (Stage 1 and 2) (20 + 5 min)

• Ioannis Papazoglou (Ministere des affaires etrangeres et europeennes (FR))

i. Installation design and status ii. ECR Progress iii. Phase 2 design and status iv. Nozzles design and manufacturing

Vacuum considerations (10 min +5)

• Marton Ady (CERN)
• Chiara Pasquino (CERN)

i. Pumping options for new mechanical design. ii. Vacuum pumps and gauges. Requirements, proposals, control system, cabling, responsibility / cost iii. Move of BGI system and connection of valves gas lines iv. Tests to be performed to validate gasses for LHC use (Ne, Ar, N)

Version 3 Vacuum Controls System (10 min + 5)

• Marton Ady (CERN)
• Gregory Pigny (CERN)
• Chiara Pasquino (CERN)

i. Requirements ii. Schedule

Vacuum performance and limitations for V4 (20 min + 5)

• Marton Ady (CERN)

HEL BGC (Version 4) design and integration

• Gerhard Schneider (CERN)
• Ioannis Papazoglou (Ministere des affaires etrangeres et europeennes (FR))

i. Design space and constraints ii. Design decisions iii. Performance impact

BGC milestones for Version 4 (15 min + 5)

• Gerhard Schneider (CERN)

i. Report from new collaboration contract including timeline

Medical Applications, atomic seeve plates, Fernel lenses (15 min + 5)

• Narender Kumar (University of Liverpool)

Wrap-Up discussion

• Raymond Veness (CERN)