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Mechanics Foil Frame and Print Anode Inner cathode Hood Pressure control + He bag + target

Status report on DC. Mechanics Foil Frame and Print Anode Inner cathode Hood Pressure control + He bag + target Electronic Schedule. Mechanics. 2. Foil. Order: a) first foil to check, 250 nm b) send 59 others up to now 3 iterations of a) Geometry OK

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Mechanics Foil Frame and Print Anode Inner cathode Hood Pressure control + He bag + target

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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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