MD1 and MD2 Preparation

Thursday 11 Aug 2022, 09:30 → 12:00 Europe/Zurich

09:30 → 09:40 Introduction and upcoming timeline

Speaker: Jan Uythoven (CERN)

MD dates.pdf

MD dates.pptx

09:40 → 09:50 MD6945: RF power limitations and instability thresholds

[5' presentation + 5' discussion]

Speaker: Helga Timko (CERN)

LHC_RFMD_MD1_2022.pdf

Notes:

• Interest for high-intensity trains
• Need to have 5-6 batches
• Can work both with 4x48b or 2x72b
• Need INDIVS with intensity up to 3x10^11 p/bunch
• Part 1 is more important, will switch to the second part if time allows

09:50 → 10:00 MD 7224: Collimation quench test with protons

[5' presentation + 5' discussion]

Speaker: Pascal Hermes (CERN)

220811_quench_test_LSWG.pdf

Notes:

• Needs a test a some time before to to prepare the relaxed collimator settings (it has been preliminarily discussed with machine coordination)

10:00 → 10:10 MD6923: Slow beam degradation from incoherent electron cloud effects

[5' presentation + 5' discussion]

Speaker: Konstantinos Paraschou (CERN)

20220811_LSWG_MD1_ecloud.pdf

20220811_LSWG_MD1_ecloud.pptx

Notes:

• Ideally should be done right after MD6864 (same configuration)
• Both should not happen right after a ramp down to avoid magnetic imperfection transients
• Should know from MPP the maximum allowable beta-beat.

10:10 → 10:20 MD8043: Beam-beam wire compensation

[5' presentation + 5' discussion]

Speaker: Guido Sterbini (CERN)

2022_08_11_GS.pdf

2022_08_11_GS.pptx

Notes:

• Bunch intensity should be at least 1.2x10^11 p/bunch

10:20 → 10:30 MD8003: Diffusion Measurements of Beam Population Using Collimator Scans

[5' presentation + 5' discussion]

Speaker: Carlo Emilio Montanari (Universita Di Bologna (IT))

all_collimator_mds.pdf

Notes:

• Should be combined with MD6950 (if not dune in EOF test)
• Please update the request for MD8003 to include both tests (for clarity)

10:30 → 10:40 MD7983: Evaluate impact of UPS noise on LHC beams

[5' presentation + 5' discussion]

Speakers: Guido Sterbini (CERN), Sofia Kostoglou (CERN)

2022_08_11_SK.pdf

2022_08_11_SK.pptx

Notes:

 - More efficient as EOF, could also be done at the end of another MD

10:40 → 10:50 MD 7943: BPM-based estimation of transverse beam sizes and emittances using DOROS acquisition

[5' presentation + 5' discussion]

Speakers: Diogo Miguel Louro Alves (CERN), Dr Marek Gasior (CERN)

220811_MD7943_BPM_beam_size_updated.pptx

Notes:

• Need INDIVs with different emittances
• Plan to have different ramps with different settings

10:50 → 11:00 MD 7203: Rematched IR7 optics for improved cleaning performance and impedance

[5' presentation + 5' discussion]

Speaker: Bjorn Hans Filip Lindstrom (CERN)

20220811_LSWG.pdf

20220811_LSWG.pptx

Notes:

• Preference for masking collimator limits in IR7 without touching the thresholds
• There will be several MDs requiring optics measurements and corrections (need to optimise the schedule based on team availability)
• The two parts of the MD can be done in different MD blocks

11:00 → 11:10 MD 7123, 7124: UFO investigations

[5' presentation + 5' discussion]

Speaker: Christoph Wiesner (CERN)

2022-08-11_Wiesner_LSWG_UFO_MDs_Vers1_0.pdf

2022-08-11_Wiesner_LSWG_UFO_MDs_Vers1_0.pptx

Notes:

• MD users prefer MD2 block (to have dBLM sorted out)

11:10 → 11:20 MD6864: Studies of b5 errors at injection

[5' presentation + 5' discussion]

Speaker: Mael Le Garrec (Goethe University Frankfurt (DE))

MD6864_chromatic_amplitude_detuning_complete.pdf

Notes:

• Needs to be done after some time at injection
• Synergy with MD6923

11:20 → 11:30 MD6804: Slow octupole threshold at the sweet spot

[5' presentation + 5' discussion]

Speaker: Lorenzo Giacomel (CERN)

MD_sweetspot.pdf