1 Trip to BNL Goal Installation of newest MAD-X at BNL Setting up space charge for RHIC in frozen mode They do not really want a renormalization of sigma values per turn Adding multipoles Adding “real” BB kicks MPI Space Charge Meeting 23 - FS

2 Installation of newest MAD-X at BNL Setting up of my access to BNL system took 2 days! Despite full advance preparation due to new security measures. The installation of MAD-X went fine when using IFORT I have to announce that the present GNU compiler on lxplus “gfortran” is defect! We could identify that the problem is due to optimization so a real problem! Newer versions are again okay. This is a late justification of using commercial compilers like IFORT! Global SVN access to MAD-X works nicely: svn co mymadX The newest MAD-X works fine so the effort by Laurent and myself have been successful! Space Charge Meeting 23 - FS

3 Setting-up for RHIC MAD-X Code fixes and new features: Needed another flag to suppress the recalculation of the emittances A misleading naming of variable has been fixed TRRUN unnecessarily printed tracking data before and after each turn – fixed Maximum Sliming of Lattice via MAD-X “SEQEDIT” command ➔ next page MACROS create about 45 SC kicks per Betatron period maybe a bit excessive ➔ further reduce for PS Various scripts written for data handling Space Charge Meeting 23 - FS

Flat and Minimal Lattice ! all set-up ready for clean-up use, period=MACHINE; ! step 1: super flat real sequence even when started with lines ! "SAVE" and "CALL" needed save,sequence=MACHINE,file=blah; call,file=blah; ! Now seqedit seqedit, sequence=MACHINE; ! All classes that can go select, flag=seqedit, class=marker ; select, flag=seqedit, class=monitor ; select, flag=seqedit, class=instrument ; select, flag=seqedit, class=solenoid ; select, flag=seqedit, class=kicker ; select, flag=seqedit, class=multipole,pattern="^eld$" ; remove, element=selected; endedit; ! now use the super clean lattice use, period=MACHINE; oPAC Topical - F. Schmidt

5 Results Multipoles inclusion trivial Extra BB kicks not really foreseen in the SC MACROS but operational Tuneshift from SC and BB as theoretically and experimentally expected The sussix code successfully installed including data scripts Detuning with amplitude successfully determined for RHIC FMA analysis started 50’000 turns per day for 1’000 particles (sufficient for frozen space charge!) Speed-up via MPI ➔ next slide As a consequence Valery and myself will modify the MACROs Space Charge Meeting 23 - FS

6 MPI They have very competent staff to handle MPI! Timing analyse of code functioning and an easy gain of a factor of 4-5 is possible. In the RHIC case where a renormalization of the sigma values is not needed this should be about a factor of 10. Several MPI strategies have been discussed It was agreed to modify the code as little as possible but organize it by running a separate set of data on each node and bringing the data together for the emittance renormalization. The issue of lost particles and IO have been addressed A handy script will be provided for easy usage ➔ Basically they will do the job for us!!! Space Charge Meeting 23 - FS

7 Round Table The crash issue must be resolved asap! This will need till after the summer Nevertheless tracking can proceed since data seem alright till the possible crash Please start using the MPICH2 version which needs a small set-up effort all explained in recent Do we need more resources in terms of the 48 core machines? MAD-X with frozen space charge will be fully applied to the PS in view of the experiments of June 2012 ➔ Short demonstration any time! The nonlinear coupled resonances will be studied together with Giuliano ➔ trip next 2 weeks The benchmark effort and the mitigation effort in full swing ➔ some update during Fermilab visit PTC-ORBIT Manual framework has been set-up ➔ start filling! Space Charge Meeting 23 - FS