Author: Reymond, H.
Paper Title Page
MOPKN007 Lhc Dipole Magnet Splice Resistance From Sm18 Data Mining 98
 
  • H. Reymond, O.O. Andreassen, C. Charrondière, G. Lehmann Miotto, A. Rijllart, D. Scannicchio
    CERN, Geneva, Switzerland
  
  The splice in­ci­dent which hap­pened dur­ing com­mis­sion­ing of the LHC on the 19th of Septem­ber 2008 caused dam­age to sev­er­al mag­nets and ad­ja­cent equip­ment. This raised not only the ques­tion of how it hap­pened, but also about the state of all other splices. The inter mag­net splices were stud­ied very soon after with new mea­sure­ments, but the in­ter­nal mag­net splices were also a con­cern. At the Cha­monix meet­ing in Jan­uary 2009, the CERN man­age­ment de­cid­ed to cre­ate a work­ing group to anal­yse the pro­voked quench data of the mag­net ac­cep­tance tests and try to find in­di­ca­tions for bad splices in the main dipoles. This re­sult­ed in a data min­ing pro­ject that took about one year to com­plete. This pre­sen­ta­tion de­scribes how the data was stored, ex­tract­ed and anal­ysed reusing ex­ist­ing Lab­VIEW™ based tools. We also pre­sent the en­coun­tered dif­fi­cul­ties and the im­por­tance of com­bin­ing mea­sured data with op­er­a­tor notes in the log­book.  
poster icon Poster MOPKN007 [5.013 MB]  
 
WEPMU010 Automatic Analysis at the Commissioning of the LHC Superconducting Electrical Circuits 1073
 
  • H. Reymond, O.O. Andreassen, C. Charrondière, A. Rijllart, M. Zerlauth
    CERN, Geneva, Switzerland
  
  Since the be­gin­ning of 2010 the LHC has been op­er­at­ing in a rou­tine­ly man­ner, start­ing with a com­mis­sion­ing phase and then an op­er­a­tion for physics phase. The com­mis­sion­ing of the su­per­con­duct­ing elec­tri­cal cir­cuits re­quires rig­or­ous test pro­ce­dures be­fore en­ter­ing into op­er­a­tion. To max­i­mize the beam op­er­a­tion time of the LHC these tests should be done as fast as pro­ce­dures allow. A full com­mis­sion­ing needs 12000 tests and is re­quired after cir­cuits have been warmed above liq­uid ni­tro­gen tem­per­a­ture. Below this tem­per­a­ture, after an end of year break of two months, com­mis­sion­ing needs about 6000 tests. Be­cause the man­u­al anal­y­sis of the tests takes a major part of the com­mis­sion­ing time, we pro­ceed­ed to the au­toma­tion of the ex­ist­ing anal­y­sis tools. We pre­sent the way in which these Lab­VIEW™ ap­pli­ca­tions were au­to­mat­ed. We eval­u­ate the gain in com­mis­sion­ing time and re­duc­tion of ex­perts on night shift ob­served dur­ing the LHC hard­ware com­mis­sion­ing cam­paign of 2011 com­pared to 2010. We end with an out­look at what can be fur­ther op­ti­mized.  
poster icon Poster WEPMU010 [3.124 MB]