rMPP meeting on MD Block 1 2023 approval

Friday 2 Jun 2023, 10:00 → 11:00 Europe/Zurich

Zoom

You can find more information on the website of the Machine Protection Panel.

2023-06-02_Minutes_rMPP_MD1-2023_approval_Vers1_0.docx

2023-06-02_Minutes_rMPP_MD1-2023_approval_Vers1_0.pdf

1 Introduction

Speakers: Christoph Wiesner (CERN), Jan Uythoven (CERN)

2 rMPP comments on MDs

Comments on MDs:
- MD7007 (Operation of Crystal collimators during energy Ramp)
- MD9406 (Bunch by bunch tune shift measurements)
- MD9545 (WS prototypes and operational system beam size measures comparison)
- MD9325 (Beam halo population measurements using collimator scans at the end of Squeeze) and MD9503 (Beam Tail population and diffusion measurements using collimator scans)

Speakers: Christoph Wiesner (CERN), Daniel Wollmann (CERN), Jan Uythoven (CERN), Matteo Solfaroli Camillocci (CERN)

2023-06-02_rMPP_comments_MD1.pdf

2023-06-02_rMPP_comments_MD1.pptx

3 MD9523: Threshold of longitudinal loss of Landau damping and MD9525: Injection power transients with different RF settings

MD9523: Threshold of longitudinal loss of Landau damping
- Confirm maximum desired bunch intensity (3e11 according to current procedure)
- Check ADT bunch intensity limit and max. bunch intensity that can be injected
- Clarify required RF interlock masking and update procedure accordingly

MD9525: Injection power transients with different RF settings
- Requested 1000 bunches with bunch intensity of 2e11 (beyond operationally achieved values): Injection set-up? Max. number of bunches?

Speaker: Helga Timko (CERN)

LHC_RFMD_MD1_2023.pdf

4 MD6923: Slow beam degradation from incoherent electron cloud effects on the 3Qy resonance

• Clarify max. number of bunches (3x72b or 600b)
• Max. allowed beta beat?
• Clarify "Optionally, retract TDIS to minimize losses on it."
• Put explicitly the optics collimator sequence to be used

Speaker: Konstantinos Paraschou (CERN)

20230602_rMPP_ecloud.pdf

20230602_rMPP_ecloud.pptx

5 MD6845: Instability measurements with varying bunch intensity

• Clarify max. number of bunches (450 or 600?)
• Discussion of required bunch intensities above the operationally achieved value (up to 1.8e11)

Speakers: Konstantinos Paraschou (CERN), Lotta Mether (CERN), Luca Sabato (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Sofia Carolina Johannesson (EPFL - Ecole Polytechnique Federale Lausanne (CH))

6 MD9407: Noise spectrum and emittance growth with different ADT gain

• Discussion of high bunch intensity of 2e11 (above the operationally achieved value)
• Details on required ADT mask

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

2023-06-01_MDNoise.pdf