HL-LHC / LIU Joint Workshop

Friday 30 Mar 2012, 09:00 → 17:15 Europe/Zurich

30-7-018 (CERN)

Progressing towards an agreed set of 450 GeV beam parameters for High Luminosity operation in LHC after LS2 & LS3. Morning sessions: talks and questions. Afternoon session: open discussion on a few pre-defined questions, led by animators.

1 Welcome

Speaker: Steve Myers (CERN)

2 Summary and outcome of the 1st LIU-HL-LHC Brainstorming meeting

Speaker: Mike Lamont (CERN)

Slides HL-LIU-brainstorm-summary-v2.pptx

HL-LHC Talks

3 Transverse emittance blow-up and beam loss between injection and collision – 20+10 minutes

o Taking into account experience with beam until end of 2011 o For 25 and 50 ns bunch spacing

Speaker: Verena Kain (CERN)

Slides EmitPreserv-Transmis-HLLHC-LIU-Mar2012.pdf EmitPreserv-Transmis-HLLHC-LIU-Mar2012.ppt

4 Update of required beam characteristics at injection energy in LHC – 20+10 minutes

o Taking into account experience with beam until end of 2011 o For 25 and 50 ns bunch spacing o Known “hard” and “soft” limits and resulting area of beam characteristics

Speaker: Oliver Bruning (CERN)

Slides Update_on_HL-LHC_parameters_space_at_injection_V1.ppt

5 Micro-batch filling scheme for pacman cancellation – 10+5 minutes

Speaker: Stephane Fartoukh (CERN)

Slides micro.pptx

6 New ideas (e.g. pile-up levelling versus luminosity levelling schemes: potential gains and losses in performance) – 10+5 minutes

Speaker: Dr Frank Zimmermann (CERN)

Slides NewIdeas-HLLHC-LIU-Joint-Meeting.pdf NewIdeas-HLLHC-LIU-Joint-Meeting.pptx

10:55 Coffee break

LIU talks

7 Analysis of performance progress in the injectors in 2011 – 20+10 minutes

o Double PSB batch in the PS o SPS improvement because of scrubbing? o What was done in MDs o Instrumentation-related issues

Speaker: Giovanni Rumolo (CERN)

Slides HLLHC-LIU-Rumolo.pdf HLLHC-LIU-Rumolo.pptx

8 Update of achievable beam characteristics at injection in LHC – 20+10 minutes

o Taking into account experience with beam until end of 2011 o For 25 and 50 ns bunch spacing o Known “hard” and “soft” limits o Suggesting area of equivalent beam characteristics.

Speaker: Dr Brennan Goddard (CERN)

Slides HL-LHC-LIU_meeting_march_30_II.pdf HL-LHC-LIU_meeting_march_30_II.pptx

9 About beam characteristics and LHC luminosity … – 20+10 minutes

- Luminosity and beam quality factor - Status - How space charge bottlenecks are addressed - Could we do better? - Path to the specifications of the LIU goals

Speaker: Roland Garoby (CERN)

Slides Miscellaneous_30March2012_Garoby_v3.pptx

12:40 Lunch (invited participants only)

Questions with one “moderator” / question, and a 1 slide introduction for each project

10 Pros-cons of 25 ns vs 50 ns, animated by J-M. Jimenez and E. Metral.

Slides Pros-Cons25nsVs50ns_EM&JMJ_v3.pdf

11 Overlapping LIU accessible beam parameters (areas) with LHC beam parameters regions (bands), animated by S. Gilardoni and G. Arduini.

Slides HL-LHC-LIU-workshop-2012_GASG6.pdf HL-LHC-LIU-workshop-2012_GASG6.pptx

16:00 Coffee break

12 List of questions to be answered by the end of 2012 / required MDs, animated by E. Shaposhnikova and R. Assmann.

Slides

• QS_LIU_30032012_rwa2.pdf
• QS_LIU_30032012_rwa2.pptx
• slides
• slides