X-rays in A4L2-A4R2 and A4L8 - A4R8 V. Baglin (19/11/11)

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Presentation transcript:

X-rays in A4L2-A4R2 and A4L8 - A4R8 V. Baglin (19/11/11) CERN TE-VSC, Geneva 1. Positions of defaults 2. Typical default 3. Summary LMC - 16th November 2011

Positions of defaults in LSS2-LSS8 TCDD VGPB.120.4L2.X LSS2L : TCTVB TCDD VAB BPMSX D1L2 D1L2 VPIA.A151.4L2.X TCLIA LSS2R : D1R2 BPMSX VAB VCTCQ TCTVB TCLIA VGPB.120.4R2.X D1R2 VPIA.A170.4R2.X TCLIA VGPB.120.4L8.X LSS8L : TCLIA TCTVB VCTCF VAB BPMSX D1L8 D1L8 VPIA.A173.4L8.X VGPB.120.4R8.X LSS8R : D1R8 BPMSX VAB TCDDM TCTVB D1R8 VPIA.A147.4R8.X

Spring was broken between May and November 2011 Typical default, DCUM 3259.3524 Left side Side view (xray from corridor to QRL) b) Metallic noise due to loose spring when hitting vacuum chamber c) RF fingers falling due to broken spring d) aperture reduced ? Non Conform b d Spring was broken between May and November 2011 c

Summary 6 vacuum modules in LSS2 and LSS8 have falling fingers due to broken springs There are no significant reduction of aperture LSS2 : -During X-ray campaign of the 10th and 12th of May, all the RF fingers were in correct position and the springs were not broken LSS8 was not imaged before last week Other modules from D1L2 to D2L2, D1R2 to ID800,R2 , D1L8 to D2L8 and D1R8 to D2R8 which have been imaged are conform The 6 non-conform modules will be repaired at next X-mas break during the opening of the sectors for the ZDC upgrade and dedicated opening for sectors in LSS8

Bonus slides

VMTSA son of VAMTF.A4L2.X Horizontal ellipse 180/70 Left side Right side LHCVMTSA0001

X-rays the 10-5-2011, DCUM 3259 b Right side Top view (xray from top to bottom) b) No metallic noise due to loose spring Conform

(to be replaced when possible) X-rays the 12-5-2011, DCUM 3404.58 a b Left side Top view (xray from top to bottom) a)Slight deformation of RF finger. b)No metallic noise due to loose spring Use as IS (to be replaced when possible)

(to be replaced when possible) X-rays the 12-5-2011, DCUM 3404.58 b Right side Top view (xray from top to bottom) a) RF fingers bent towards exterior b) No metallic noise due to loose spring – spring in place Use as IS (to be replaced when possible) b