Author: Moron Ballester, R.
Paper Title Page
MOPO027 Status of a Study of Stabilization and Fine Positioning of CLIC Quadrupoles to the Nanometre Level* 538
 
  • K. Artoos, C.G.R.L. Collette, M. Esposito, P. Fernandez Carmona, M. Guinchard, C. Hauviller, S.M. Janssens, A.M. Kuzmin, R. Leuxe, R. Moron Ballester
    CERN, Geneva, Switzerland
  
  Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no.227579
Me­chan­i­cal sta­bil­i­ty to the nanome­tre and below is re­quired for the CLIC quadrupoles to fre­quen­cies as low as 1 Hz. An ac­tive sta­bi­liza­tion and po­si­tion­ing sys­tem based on very stiff piezo elec­tric ac­tu­a­tors and in­er­tial ref­er­ence mass­es is under study for the Main Beam Quadrupoles (MBQ). The stiff sup­port was se­lect­ed for ro­bust­ness against di­rect forces and for the op­tion of in­cre­men­tal­ly repo­si­tion­ing the mag­net with nanome­tre res­o­lu­tion. The tech­ni­cal fea­si­bil­i­ty was demon­strat­ed by a rep­re­sen­ta­tive test mass being sta­bi­lized and repo­si­tioned to the re­quired level in the ver­ti­cal and lat­er­al di­rec­tion. Tech­ni­cal is­sues were iden­ti­fied and the de­vel­op­ment pro­gramme of the sup­port, sen­sors, and con­troller was con­tin­ued to in­crease the per­for­mance, in­te­grate the sys­tem in the over­all con­troller, adapt to the ac­cel­er­a­tor en­vi­ron­ment, and re­duce costs. The im­prove­ments are im­ple­ment­ed in mod­els, test bench­es, and de­sign of the first sta­bi­lized pro­to­type CLIC mag­net. The char­ac­ter­i­za­tion of vi­bra­tion sources was ex­tend­ed to forces act­ing di­rect­ly on the mag­net, such as wa­ter-cool­ing in­duced vi­bra­tions. This paper shows the achieve­ments, im­prove­ments, and an out­look on fur­ther R&D. 		 
 
MOPO028 Modal Analysis and Measurement of Water Cooling Induced Vibrations on a CLIC Main Beam Quadrupole Prototype* 541
 
  • K. Artoos, C.G.R.L. Collette, M. Esposito, P. Fernandez Carmona, M. Guinchard, S.M. Janssens, R. Leuxe, M. Modena, R. Moron Ballester, M. Struik
    CERN, Geneva, Switzerland
  • G. Deleglise, A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  
  Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no. 227579.
To reach the Com­pact Lin­ear Col­lid­er (CLIC) de­sign lu­mi­nos­i­ty, the me­chan­i­cal jit­ter of the CLIC main beam quadrupoles should be small­er than 1.5 nm in­te­grat­ed root mean square (r.m.s.) dis­place­ment above 1 Hz. A stiff sta­bi­liza­tion and nano-po­si­tion­ing sys­tem is being de­vel­oped but the de­sign and ef­fec­tive­ness of such a sys­tem will great­ly de­pend on the stiff­ness of the quadrupole mag­net which should be as high as pos­si­ble. Modal vi­bra­tion mea­sure­ments were there­fore per­formed on a first as­sem­bled pro­to­type mag­net to eval­u­ate the dif­fer­ent me­chan­i­cal modes and their fre­quen­cies. The re­sults were then com­pared with a Fi­nite El­e­ment (FE) model. The vi­bra­tions in­duced by wa­ter-cool­ing with­out sta­bi­liza­tion were mea­sured with dif­fer­ent flow rates. This paper de­scribes and an­a­lyzes the mea­sure­ment re­sults.