Choose timezone
Your profile timezone:
CLIC & IPAC videos
→
Europe/Zurich
CLIC & IPAC videos
The meeting started with a short general discussion and news, followed by two CLIC related presentations, and then ten short video presentations prepared for IPAC (not commented here but highly recommended to watch directly).
Rogelio reported that the LHC magnet training progresses well. One arc reached 7 TeV. One magnet (B28L8) will have to be replaced requiring a warm-up of sector S78 with some consequences on the re-start of the LHC. Implication were also discussed in the LBOC yesterday. Tobias said the beam test may come 2 weeks later and be without ramp.
Details of the LHC beam test preparation will be discussed in a one day meeting just before or after the holiday period.
Helmut commented on discussions in yesterdays HL-LHC coordination meeting : several of the very challenging detector upgrades and machine installations could profit from a prolongation of LS3 from 2.5 to 3y, and efforts are made on the machine side to mitigate the impact of radiation in the triplet region like changes in the crossing angle,
that would help to minimize risks in case of an extension of RUN3.
Rogelio attended an EIC (US electron ion collider) review yesterday. The aim is to write a CDR next year. There are many challenges, particularly also on the new electron ring and the request to allow for a second interaction region.
Riccardo reported from discussions he and Alex attended yesterday on the efforts to converge to a single coherent database combining engineering layout and alignment information suitable also for our lattice needs. This activity will become a project and aims for a first report by the end of the year.
Andrii Pastushenko presented MAD-NG / PTC studies for CLIC with a non-linear optics optimizaration for the Final Focus (slides).
The L* was already increased by Fabien from 4.3 to 6 m for the CLIC 380 GeV option to allow to reduce the overlap of the final focus quadrupole with the experimental solenoid, increasing lengths and local chromaticity. This can be optimized using shorter quadruples and improved non-linear correction. Andrii successfully found new configurations to boost luminosity performance by 5%.
Several methods were used, including simulations (MAPCLASS, PLACET w/o SR), PTC, and MAD-NG that may help to boost the speed. Reported differences between PTC and MAD-NG during the MAD-NG review have been understood and solved now.
Vera Cilento reported about her work for the CLIC dual Beam Delivery System (BDS) design (slides and video), to allow for two interaction regions without need for push/pull detectors, both for the CLIC 380 GeV and 3 TeV options. The studies include an update of solenoid effects for the increased L*.
The BDS length get increased by 300m at 380 GeV and 1km at 3TeV to allow for two IPs. The reduction in luminosity was found to be negligible at 380 GeV and up to about 30% in the new IP at 3 TeV, what is considered acceptable.
The next LNO meeting would normally be on Wed 26/5, that is occupied by a departmental meeting, and therefore rather be scheduled on a different day in that week, probably Tuesday or Thursday morning. Two topics are foreseen : news from injectors and a report from Laurent on progress with normal forms in MAD-NG.
There are minutes attached to this event.
Show them.
