|Deliverable D5.1: Simulation models for beam loss approved|
|Deliverable D5.2: Simulation models for energy deposition approved|
|Deliverable D5.3: Beam halo simulations approved|
|Deliverable D5.4: Energy deposition simulations for upgraded collimation layouts approved|
|Deliverable D5.5: Conceptual design of IR collimation approved|
|Deliverable D5.6: Technical design of IR collimation approved|
Several HiLumi milestones are within the scope of the ColUSM. The relevant results are summed in this page. A more complete description of tasks, deliverable and milestones can be found in this document.
The different upgrade optics, developed by MadX, have been implemented in SixTrack for the set up of cleaning simulations.
Plots illustrating the ATS optics can be found on the halo simulation page:
|reference ATS case|
One of the main modification of the collimation system for ATS is the addition of two Dispersion Suppressor Collimators (TCLD), to protect from the loss clusters in the Dispression Suppressor of IR7. To make room for one these collimators, an 8.3T dipole is replaced by two shorter 11T dipoles. The implemetation is described on this page.
The setup and results of the halo cleaning simulations are available here:
|11T dipoles and DS collimator, Beam 1.|
Another main modification considered is the addition of the same system in cell 10 around IP2, in order to intercept the secondary ion beams. Details of installation are on the page:
|Models of Dispersion Suppressor Collimator|
This milestone concerns the assessment of tools for energy deposition studies for IR collimator solutions. The simulation results rely on integrated tools for the particle tracking and for the energy deposition studies that have been set up throughout the years (cf. previous Milestone, Models of Dispersion Suppressor Collimator). Recent work within the WP5 team was aimed at assessing the results of the tools used for the specific purpose of the HL-LHC collimation studies. The assessment is based on comparisons between different tools and - when applicable - on the comparison to experimental data collected during the LHC Run 1.
The assessment of energy deposition studies is achieved in different ways for the simulation cases relevant for the WP5 studies:
The simulations of energy deposition have been compared with he measurements of the collimation quench test performed in February 2013
E. Skordis, Collimation Review 2013.
This is summarized here:
|Quench test: energy deposition simulations & loss measurements|
Studies of energy deposition for ions have been performed by the FLUKA team for two possible collimator designs G. Steele, ColUSM#30.
The expected loss location of the secondary beams agree with the measurements in the LHC (J. Jowett).
More details on the ions studies are available here:
|Ions simulations and measurements|
Studies of energy deposition in IR5 have been performed by the FLUKA team to evaluate the TCL6 and to compare with BLM measurement L. S. Esposito, CWG, 2014.
FLUKA simulations of debris in the straight section were presented at the 2nd annual meeting: Energy deposition studies for TCLs in IR1/5 (L. S. Esposito et al.).
|R. Bruce, A. Lechner, S. Redaelli - Milestone Report 2014|
One aspect of a new IR collimation solution is the study of collision debris around IP1 and IP5. These debris could be intercepted by extra TCL in cells 4, 6 and 7, in addition to the one already installed in cell 5.
The setup and results of debris cleaning simulations for different cases are available here:
The final report will be posted here when available.