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Status Report on DC Mechanics, Foil, Frame, and Print

This status report provides updates and findings on the DC mechanics, foil, frame, and print components. It includes information on the foil order, resistivity of the foil bands, carbon frame and print, inner cathode, hood, pressure control, and electronic components. The report also outlines the schedule for future testing and prototype production.

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Status Report on DC Mechanics, Foil, Frame, and Print

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  1. Status report on DC • Mechanics • Foil • Frame and Print • Anode • Inner cathode • Hood • Pressure control + He bag + target • Electronic • Schedule DC status - BVR

  2. Mechanics DC status - BVR

  3. DC status - BVR

  4. 2. Foil Order: a) first foil to check, 250 nm b) send 59 others up to now 3 iterations of a) Geometry OK ~ +.1% vertically, ~-.1% horizontally Third foil  larger width of the non aluminized separations between the strips smaller size of the aluminized reference crosses It looks like if the etching was done in 2 sequences with a shift perpendicular to the strip by roughly a fifth of the separation. DC status - BVR

  5. W W Resistivity • interruptions, too thin • Ok ! Too thin • Many problems,Thicker the resistance of foil bands (~30 cm long and ~2 cm wide) before etching [Ohm*cm] after etching [Ohm*cm] foil2 2 .0 1.9foil 3 1.5 > 18.0 standard aluminized Mylar foil 1.1 2 concentric electrodes (r =~1mm and 17 mm). foil2 1.1 to 1.6 1.1 to 1.6foil 3 .74 to 2.2 3.3 to 20 standard aluminized Mylar foil .71 DC status - BVR

  6. a couloscope in nm at different positions of a sample)foil1 120, 120, 117 foil2 after: 112, 96, 70foil3 before: 188, 139, 131, 171foil3 after 255, 197, 201 Thickness transparency DC status - BVR

  7. 3. Frame and Print • A) Anode • First simultaneous use of carbon frame and print-> successful check of information from the telegraph equation and units simulation (see later) • Experience about details of the procedure to built and equip anode frames • First iteration simulation of how the frame should be ordered to realize with mechanical tension what we finally want to have  second order • Built in a always working Al prototype with cathode foil • 5. Wires problem of other PSI groups solved DC status - BVR

  8. c wings basis Carbon fibers • 3. Frame and Print • B) Inner cathode Stretchedcarbon fibers(1000x d=6mm) and deformedROHACELL Carbon brings a factor 5-7 DC status - BVR

  9. Same iteration as anode • Good to 10-15 % • „linear“ matching with tension on carbon fiber wire • < 200 g/cm but as much as possible Procedure under control Actually at PSI last production turn to document precisely the size of deformations  PRODUCTION DC status - BVR

  10. 3. Frame and Print • C) Hood DC status - BVR

  11. DC report june_04,J.E. Mounting of Hood foil • To do better: Stretch „vertically“ and fix the width • Modify the shape of the hood to have a larger flat surface to glue • Machine a foam structure in ROHACELL 30 • Adapt the cathode foil procedureOnly minor modifications to the previously designed tools Largest height Not disturbing the cell Long design time Long delivery time DC status - BVR

  12. On the frame Steel wires Carbone fiber On the carbone fiber and foam structure On the foil DC status - BVR

  13. bubbler F0 pb p Fo Pa Fi Fo = a (p-pa) V = V0 + c (p-pb) Fi- Fo = d(kVp)/dt = k (dp/dt) (V0 + c (p-pb) + cp) dp/dt ~ (Fi – a (p-pa) )/cp a = 3 cc/(min*mbar) c = 588 cc/mbar dp/dt = .2 mm / 10 mbar DC status - BVR

  14. ~/2 ~/20 DC status - BVR

  15. 4. He bag + Pressure control young positrons traverse 1 Foil „Leaves“ space for TC Cable duct is tight More complicated than overall bag DC status - BVR

  16. He bag He C2H6 WC 16x He v Hermes, Belle (Openshaw,TRIUMF) + MKS Too expensive, big size, magnetic DC status - BVR

  17. He bag He C2H6 WC 15x WC He v 1.3 g/mbar on the chamber 1.7, [8.6,13.6] mbar for 10 cm of He [He-ethane,Air] evt. 2 or 3 groups of chambers ~30mbar for 1m tube( radius= 2mm,1 cm**3/s of Air), 23 mbar for He(50%),C2h6(50%) Gas input in the chamber ~= 15 cm of tube with half diameter Total gas impedance should not vary more than 20% to have healthy gas flow in all chambers DC status - BVR

  18. Electronic • uncertainty on why no charge division effect seen on small prototype • -> bad matching of anode impedance on print impedance (correction out of range for print) • Program with telegraph equation and print unit simulation Decoupling capacitor not optimized • Practically preamps survives HV breakdown of 2.1 KV ~ 3 pF • Tool ready to be used Cables and preamps production sufficient to test correctly the Al prototype with anodes DC status - BVR

  19. 2.82 nF .82 nF Influence of decoupling capacitor DC status - BVR

  20. Coming • Test next foils ……. • Test on old hood: to check principle and tools + scale of foil deformation on pressureorder Carbon Hood_0 (~7 weeks) • Last turn + Detailed measurement of elasticity and deformations of inner cathode, final order (~ 5 weeks) • Sr-source run with DRS (not luxurious, 28 for 36 needed) of the Al-prototype (C-anode frame + cathode foil 2) • -> confirm results of small DC for the 1:1 prototype • -> ev. Get a measured limit on the necessary cathode resistivity • 2 Russians (01/03/05 for 6 months) DC status - BVR

  21. Drift Chamber 2002 2003 2004 2005 Full Prototype Beam test Medium Prototype Charge division & Cosmics Full Prototype Full Detector (18 DC) Medium Prototype Charge division & Cosmics COBRA inside Full Size Prototype outside Inside COBRA Full Prototype Full Detector (18 DC) DC status - BVR Design Manufacturing Assembly Test Milestone

  22. Drift Chamber 2002 2003 2004 2005 Full Prototype Beam test Medium Prototype Charge division & Cosmics Full Prototype Full Detector (18 DC) Medium Prototype Charge division & Cosmics COBRA Full Size Prototype inside outside Full Prototype Full Detector (18 DC) Inside COBRA DC status - BVR Design Manufacturing Assembly Test Milestone

  23. DC status - BVR

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