Login

ABP-HSS Section meeting

→ Europe/Zurich
Description

https://cern.zoom.us/j/7288039887?pwd=aTNzbW9xWXRnMzNSam12YU9Ob1ZIUT09

Hide

News and round table
--------------------

Rogelio says we now expect that no 11 T magnets will be installed in the current LS2, to be confirmed by
the 23 October meeting between experiments and CERN management.
Rogelio had a meeting with Mike Seidel on collaboration with EPFL, including a planned continuation of BOINC.

Helmut commented on experiments related activities : planned for next week are an LBS meeting https://indico.cern.ch/event/866773/ with CMS and LHC-b presentations and a HL-LHC coordination WG meeting.

Injectors:
Alex reports on efforts to get software ready for the restart and discussions on standardizing optimization tools including machine learning.
The PS will be handed over this week to OP for hardware commissioning.
Work is in progress with FLUKA to study losses in multi-turn extraction including a simulation of showers in the septum blades.
Rogelio said he heard there are doubts that there will be a run with ions in the injectors in 2021.
Riccardo reports about ongoing checks on database and MAD-X apertures for the SPS.

Collimation:
Roderik says the team is looking into the consequences if the 11 T are not installed, and in particular on using crystal collimation for ions.
Daniele will soon present ion loss studies in the collimation team to be followed by a presentation in the LMC.
The team works (with OP and CO) on controls and interlocks.

OMC, Tobias
OMC had two recent meetings. Hector presented triplet sorting to minimize beta beating.
Andreas reported about coupling studies using the AC dipole, Jacqueline about SuperKEKB measurements. Elena presented in the rexent LBOC#123 about optics reconstruction and correction with machine learning.

Codes
Tobias said he implemented the connection of rotation and translation for PTC as requested by BNL.
Work is in progress on dealing with misalignment : applying this in the proper order, starting with rotations.
Higher orders are currently lost when dipole fringe fields are translated to DIPEGE, as shown by Helmut (MAD-X issue #961).
Tobias plans to fix this for the next release (planned for later November). Reproducing the bend fringe on the TWISS level with DIPEDGE would need an extra attribute to distinguish between entry and exit DIPEDGE.
Riccardo reported on improvements on SixTrack/sixtracklib post processing tools.

Presentations with slides
--------------------

Experience with MAD-NG for LHC coupling, Tobias Persson
Tobias performed tests of local coupling based on the 2018 studies for the LHC 50 cm ion optics in IP1, IP2, IP5.
He gets very similar beta function values from MAD-X and MAD-NG .
Matching TWISS in MAD-NG is currently slower than MAD-X. The MAD-NG tracking speed is comparable to PTC.
Laurent comments that speed optimization is planned after validity tests and that he expects speed-ups by factor of four. 
Riccardo suggests to also compare with (thick bend, quad) MAD-X tracking.

Experience with MAD-NG for CLIC FFS, Andrii Pastushenko
The test were performed for the CLIC 380 GeV BDS lattice.
He gets similar TWISS parameters from MAD-X-PTC and MAD-NG and larger differences for beam sizes and maps.
He observed that MAD-NG was faster than MAD-X to generated maps.

There are minutes attached to this event. Show them.