Muon Collider ESPPU Editorial meeting

Wednesday 9 Oct 2024, 16:00 → 17:30 Europe/Zurich

Daniel Schulte (CERN)

The document will contain two parts. The first is an assessment of the concept, its status and the progress of work. The second part is an R&D plan for the next decade. You can find the document in overleaf: https://www.overleaf.com/3781273291qffchfrfbbwz#c64fce 

To do for this meeting:

• Section editors: please identify among your fellow section editors one person who can attend the meeting and could answer questions on the section (it doesn’t need to be the same person in every meeting - just keep your chapter editors up to date)
• Section editors: write-up plans - decide if your section will be based on the interim report + updates or written from scratch
• Chapter editors: please identify among your fellow chapter editors somebody who will attend the meeting and will briefly report on the status and let us know who that person is (also here, it doesn’t need to be the same person every week - but please keep us updated).
• Chapter editors: gather inputs for the write-up plans from the various section editors in your chapter.

First meeting https://indico.cern.ch/event/1464260/ 

 

Attendees: F. Meloni (FM), R. Taylor (RT), C. Rossi, Andrea (AW), A. Chance (AC), A. Lechner (AL), C. Rogers (CR), D. Schulte (DS), D. Marzocca, D. Neuffer, D. Zuliani, D. Stratakis, D. Lucchesi (DL), E. Mactavish, H. Damerau (HD), J. S. Berg (SB), K. Krizka, K. DiPetrillo, K. Pedro, L. Sestini, Ithiele, L. Longo, N. Craig, P. Meade, R. Losito (RL), R. F. Ximenes (RFX), S. Marsh (SM), S. Johannesson (SJ), W. Hopkins

 

Excused: L. Rossi, N. Pastrone, C. Ahdida, J. Manczak, E. Metral (EM), S. Jindariani, J. Somoza, E. Nanni

 

Minutes:

• FM started with slides:

• Timescales and deadlines in the first box of the Overleaf document

• End of January 2024 as the final draft deadline.

• FAQ. 4-6 pages per section. Please get in touch with Federico if you want more pages. Shorter sections are welcome.

• R&D Inputs

• Prepare a table as per the powerpoint

• Meetings are round tables, chapter by chapter.

• 16/10 Evaluation Report, 23/10 R&D proposal & implementation

• Set up section editors, chapter editors & reporting chain.

• Today: High level plans

AL: R&D phase, we define resources until 2035? Is this CDR?

• DS: Yes, CDR. Idea is 2036 we launch decision process. (More than CDR). 

 

Discussion:

• Executive Summary (DS): Take 10 page short report as the same as the long report executive summary.

• Showed word document giving ExecSumm overview.

• Will address risks with R&D, so will go in R&D section.

• FM: Will create a series of key messages resulting from the bulletpoints written by each section at the end of October.

• RL: Should establish a baseline ‘reference’ design including energies and structures.

• FM: Parameter report covers this.

• DS: All is moving, but will establish what we aim for, and what has already been achieved.

• RL: Yes, sketch and main parameters as a summary before the more detailed Evaluation Report.

• DL: Yes, not just refer to parameter report but also include at the start of the Eval Report.

• RL: Yes, also so that we all work on the same configuration.

• RT: Yes, for example 2 MW vs 4 MW, need to explicitly say which one is being assumed.

• DS: Agree, we should write the options within this section as well.

• SB: Shouldn’t have different parameters per subsystem even if its explicitly stated.

• CR: It is consistent for front end and cooling (Section 5.5). More or less self-contained.

• Physics (AW): Will discuss soon. Plan to reuse interim report (IR) and add additional points under discussion. For R&D plan this will be written from scratch.

• Request for more space compared to the IR.

• DS: Will theorists submit physics case for different colliders?

• AW: There is a main theorist submission for the strategy. Not aware of any others, or at least for all colliders.

• Interface (AL): Global numbers will not be so different. Anticipate staying as it is for the IR.

• Detectors (DL): New detector concept, writing from scratch compared to IR. Will have the description of MUSIC and MAIA in parallel. Performance description, including physics objects.

• FM: Before was 3 TeV, now it is 10 TeV focused. Will we return to 3 TeV?

• DL: Lots of previous material on the 3 TeV, so can do it. Now we choose to move to something new.

• DS: Could still include 3 TeV in the document for reference.

• FM: Yes, it is part of the status.

• Accelerator: 

• Proton Driver (NM, SJ): IR content. May need to shorten it. They are working in a separate document to write and condense.

• Target, Front End & Cooling (CR): Want to be more thorough than IR. Don’t meet baseline parameters yet, so going through options. 2 pages target and capture. 2 pages rectilinear, 2 pages final cooling. Need to explain impacts of different options to meet the baseline. Likely to overflow 6 pages.

• AG: Sticking to parameters in parameter table?

• CR: Continue to edit parameters. 2 MW and 4 MW on target. Cooling has 2 options. Either longer rectilinear cooling to final cooling with high magnetic field, or stop rectilinear cooling earlier and go into final cooling which causes larger longitudinal emittance.

• AG: Need to synchronise RF systems.

• CR: Will not change. 

• FM: Putting a pin in this. Sounds important to RL’s one page summary.

• RL: Critical section for introducing demonstrator. Should not be as short as possible. Important to describe the reason why we need the demonstrator. 

• CR: Yes - and it is very complicated, so need to explain properly. Will discuss in the fortnightly Cooling meeting tomorrow.

• NM: Presenting parameters in the last parameter document. The two options. On the same page as target.

• DS: Baseline is 2MW, explore if we go to 4 MW.

• Acceleration (HD): Have not discussed with the three of us, but start with the interim report. Will add work from Lisa and Fabien to update numbers and have more meat.
  How much detail in RLAs?
  How much detail for site-based options?

• SB: Presentation on the RLAs from Anvi.

• HD: Too preliminary. 

• DS: Check with Anvi - check if RF assumptions are true. Otherwise we use MAP.

• DS: After cooling, site specific implementation is same except for civil. Can discuss non-greenfield options in the site implementation chapters.

• AC: Agree with IR and RLAs.

• Accelerator - Collective Effects (EM - sent in advance): some changes wrt interim report (different RF cavities, scans in the mitigation methods and two-beam impedance effects)

• Technologies:

• Magnets ():

• Power converters ():

• RF (AG): Basis from IR. Update it based on latest parameter tables.

• Request from RT: To not copy Parameter Report directly until the end of October, to avoid subtle differences.

• Targets (RFX): Start with IR. Complement it with 4 MW option. Ensure consistent with parameters of proton drivers and muon cooling.

• Radiation Shielding (AL): Based on IR. Shielding for collider and target in same section. Preliminary results on RCS.

• Cooling Cell (RL): Not discussed. Clear ideas after Fermilab workshop. Based on the D8 document for MuCol.

• Cryogenics ():

• Technologies - Vacuum (sent in advance): based on interim report + updates

• Instrumentation():

• Radiation Protection ():

• Movers ():

• Infrastructure (RL): Not started. Do we give a number for greenfield, or comment on CERN vs Fermilab.

• DS: Give estimate for key power drivers. Are still looking into scenarios. Staging might be different. Could remove this section if you agree. Not Muon Collider proper, but just additional constraints.

• Safety (SM): Good to understand baseline concept in case there are any changes. Who should I discuss with?

• RL: No additional risks. Can copy from IR.

• FM: Pencil in that we should have a follow-up meeting at some point.

 

• R&D:

• FM: Want to collect information from the table sent around.

• DS: Very urgent. Even if things have not been fully consolidated. Resource estimates will not be precise 10 years down the road. Last time this came from the WGs. Might want dedicated individual meetings to throw out ideas and come to a common conclusion.

• FM: Should we coordinate centrally or go via each team.

• DS: Should make priorities. Aim for total R&D of 50 - 100 MCHF over 5 years for materials.

16:00 → 16:10 Introduction

Speakers: Chris Rogers, Federico Meloni (Deutsches Elektronen-Synchrotron (DE))

Introduction_241009.pdf

16:10 → 17:00 Roundtable