PANDA Fw Endcap EMC, status prototype Herbert Lhner, Henk Smit, - PowerPoint PPT Presentation

PANDA Fw Endcap EMC, status prototype Herbert Löhner, Henk Smit, Riemer Bergsma (mech. engineering), Annelie Kluttig (research engineer), KVI Groningen carbon fiber alveoles produced at Fiberworkx BV H. Löhner - PANDA-FwEndcapEMC March 2009 1

identification of position gauges reading 1 8 accuracy 2 0.005 mm 7 3 6 5 4 H. Löhner - PANDA-FwEndcapEMC March 2009 2

alveole # NB003 sag progression after loading “crystals” from the back side Proto NB003, back loaded and glued 0,06 Displacement (mm) 0,05 0,04 Left dial guage 0,03 Middle dial guage 0,02 Right dial guage 0,01 0 21-1-2009 23-1-2009 25-1-2009 27-1-2009 29-1-2009 31-1-2009 2-2-2009 4-2-2009 6-2-2009 8-2-2009 10-2-2009 12-2-2009 14-2-2009 16-2-2009 18-2-2009 Date displacement < 0.05 mm during 30 days H. Löhner - PANDA-FwEndcapEMC March 2009 3

integration DIRC and FwEndcapEMC light Al frame (540 kg) supported by solenoid, space for digitizing electronics: 16 times 0.4 m 2 = in total 6.5 m 2 inserts with alignment crosses foreseen in central hole final decision needed: rectangular / elliptic hole? H. Löhner - PANDA-FwEndcapEMC March 2009 4

simulation: displacement max. 0.64 mm H. Löhner - PANDA-FwEndcapEMC March 2009 5

Assembly with alignment crosses H. Löhner - PANDA-FwEndcapEMC March 2009 6

space for cables and supplies H. Löhner - PANDA-FwEndcapEMC March 2009 7

stress and temperature sensors H. Löhner - PANDA-FwEndcapEMC March 2009 8

Fiber Bragg Gratings (FBG) C. Doyle, Smart Fibres Ltd. 2003 maximum reflectivity occurs at Bragg wavelength λ B with λ B = 2 n eff Λ where n eff = effective refractive index of mode of propagation in fiber, and Λ = FBG period H. Löhner - PANDA-FwEndcapEMC March 2009 9

FBG interrogation techniques time-division multiplexing: TDM H. Löhner - PANDA-FwEndcapEMC March 2009 10

FBG measurement results ELECTRONICS LETTERS 6th June 1996 Vol. 32 No. 12 H. Löhner - PANDA-FwEndcapEMC March 2009 11

temperature and strain sensitivity temperature / strain applied to a Bragg Grating alters the wavelength of reflected light H. Löhner - PANDA-FwEndcapEMC March 2009 12

fiber embedded in C-fiber composite Magnified cross section of a laminated carbon fiber panel containing an embedded optical fiber sensor (125 µm diameter): option to embed fiber in alveole composite: avoid strain sensitivity? H. Löhner - PANDA-FwEndcapEMC March 2009 13

(WDM) H. Löhner - PANDA-FwEndcapEMC March 2009 14

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(= 1.9 K absolute temp.) H. Löhner - PANDA-FwEndcapEMC March 2009 18

however … equipment available from IPHT Jena: readout unit for 32 sensors at 400 Hz: 14 k€ cost of fiber: per sensor ca. 40 € will investigate with other companies if cheaper test system can be acquired H. Löhner - PANDA-FwEndcapEMC March 2009 19