7 TeV Standard LHC Optics

Contents:


SixTrack simulations of radiation damping (E. Quaranta)

The provided data are the results of a study about off-momentum cleaning in the LHC IR3 TCP. Particles with large momentum offsets, driven into the momentum collimation insertion by radiation damping, are on the focus of this work.
The SixTrack code has been used to simulate proton losses at 7 TeV scenario: particles lose energy turn by turn due to the emission of synchrotron radiation and eventually they hit the IR3 TCP.

The results provided here refer to simulations of 120 000 particles, tracked for 1.3 millions of turns. For any other detail about the simulation parameters (even the collimator settings used), please refer to the IPAC13 paper: SixTrack Simulation of Off-Momentum Cleaning in LHC .

For more information, see LHC Collimation Working Group #156 and Collimation Working group #160.


Two other files are included in this folder:

impacts_real_ALL.dat contains the collimator coordinates (x, x', y, y') where particles performed inelastic interactions.
collgaps.dat contains all the informations about the collimators (type, material, setting, etc)

Hits on the aperture (LPI file) are not included and should be insignificant compared to the hits on collimators.



Simulations of LHC at 7TeV with extra DS Collimators:

The standard sequence has been modified: new collimators have been installed in the cells 8 or/and 10 of the Dispersion Suppressor right of IR7,
at the position which would correspond to the space made available by replacing a 8.3T dipole by two shorter 11T dipoles.
The collimators are called TCRYO in SixTrack.
Several cases were considered: the links below refer to simulations of Horizontal Beam 1.

No TCRYO
One TCRYO in cell 8
Two TCRYO in cells 8 and 10

In the following zipped file, the outputs from a collection of cases simulated adding 0, 1 or 2 DS collimators, using different types of halo (HB1, HB2, VB2) and collimator settings (nominal, relaxed or tight settings) as well as two possible DS collimator lenghts (80 cm and 100 cm):
Collection of several simulated cases, with and without DS collimators


Simulations of LHC after LS1:

Complete list of collimator settings in all the IPs for different optics configurations foreseen for 2015 (by R. Bruce)

Injection beta* = 40cm beta* = 65cm beta* = 80cm beta* = 80cm (Roman Pots in)

6.5 TeV, relaxed settings

6.5 TeV, relaxed settings