Summary notes of the HSS meeting on 03/03/2014

Present: RB, HB, RDM, LD, MF, MG, PH, CH, JJ, EQ, AS, MS, PS, RT, GV, RWa, RWe, JC

Report from meetings

• SLM and general information -> MG
  Welcome Robert Westenberger, Jaime Coello de Portugal and Andrea Santamaria who will work on non-linearities in the LHC, online model and LHC machine detectors interface, respectively.
  Massimo reminds we also discuss non-LHC hadron machines. Next meeting we expect to hear from the FCC and from Stephane about the post LS1 running strategy in preparation of further discussions in the LBOC. It appears that there is a general trend to keep the optics similar to Run 1 and leave ATS for MDs in 2015.
  Invitation lists for HSC section meetings have been cleaned. If people from HSS would like to continue to receive also HSC invitations they should contact Elias.
  A new group wide ABP meeting will be organised bi-weekly on Thursday mornings to improve the information flow in the group.
• PS-LIU -> SG
  Status of new e-cloud detectors: the optical detector is undergoing laboratory tests. The PU detector has been delayed due to work load of the main workshop and delays in the delivery of the ceramic parts and drawings. The installation should be performed in June and the vacuum sector is not a critical one.  
  The Finemet cavity is in the tunnel, only two final amplifiers have been installed for testing to avoid irradiating too many of them during the test period.  
  There are issues with parts of the new WCM from external company. Probably it will not be installed now and the schedule is still unclear. Installation might be difficult, as the vacuum sector is a critical one.
  ECR: new octupoles for space charge resonance compensation should be circulated soon.
  Topics of next project meeting: RF instabilities. Fully coupled optics for SC.
• Collimation status -> SR
  New collimators are arriving and will be installed, more at the collimation meeting later today.
• MAD-X status -> LD
  Few extra bugs remain to be fixed before the new pro-release.  One of them is related to overwriting by c-strings in the aperture code. Ghislain started cleaning up of core parts with reference to CERNLIB, and will then work on the Touschek module.
• SixTrack status -> RDM
  Code to implementing exact drifts has been committed to svn, thanks to Mattias. Reading binary files from SixTrack has been implemented. As already mentioned last time, SixTrack has been accepted as a software project with possible 2 month special IT summer student support by Google. The students would not actually come to CERN but do work remotely related to SixTrack , in a similar way as done for other software projects like GEANT or ROOT.
  There is progress on the Roderik et al. collimation extensions to SixTrack. Riccardo proposes to include this in the repository and regular tests.

Update on the optics repository web pages -> RdM (slides)

Massimo recalled that we need several updates in our optics files to follow the changes in hardware in LS1 for Run 2, related for example to collimators, instruments,  correctors and repaired skew quads in sector 3-4.
Riccardo started to make a new web repository which should give all essential information on the main configurations in a convenient way, see http://rdemaria.web.cern.ch/rdemaria/www/.  This already includes tables with tfs and csv files, as well as figures which show the optics parameters and which were made using python. He made two main branches, one for LHC Run 1 protons and another for HL-LHVv1.0 optics.
Riccardo asks for feedback and received already a number of questions and suggestions during the meeting.
John Jowett asks that sample jobs should be windows friendly free of soft links, and suggests to include excel files with macros and provision for 2D and 3D dynamic plots based on his Mathematica tools.
Laurent would like to have this within the cvs MAD-X project and connected to MAD-X testing.
Massimo would like entries for every year of LHC running.

Riccardo also plans to include high-beta optics which need special care to deal with global tune compensation.

Aperture display -> HB (slides)

Helmut looked into methods to generated 3D optics and geometry display based on MAD-X lattice and aperture information. Among the several possible commercial and free tools, he finds that the ROOT Geometry and Event display is particularly useful and well adapted to our needs. He showed how the ROOT geometry and tracking display can be generated from MAD-X optics and survey tables,  and illustrated this for LHC IR5, see his slides. Piotr Skowronski said that he in fact came to a similar conclusions already a while ago, and that he wrote the interface PTC_PRINTFRAMES which directly generates ROOT geometry code in MAD-X.

AOB 

Last update: 11-March-2014

MG & HB

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