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MEG DC (report June 04)

DC report june_04,J.E. MEG DC (report June 04). Foil stability and quench related problems How to get more stability Frame design Measurement of the m target position schedule 2004-2005. DC report june_04,J.E. Y O. X L. Y O ,X R +X L. X L , X R. X R. p DC. p bag. Sbag1. Sbag2.

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MEG DC (report June 04)

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  1. DC report june_04,J.E. MEG DC (report June04) • Foil stability and quench related problems • How to get more stability • Frame design • Measurement of the m target position • schedule 2004-2005

  2. DC report june_04,J.E. YO XL YO,XR +XL XL,XR XR pDC pbag Sbag1 Sbag2 Bag gas DC gas Pbag,PDC Pbag-PDC bubbler Vbubbler Hood foil stability test • a) .1 mm not reached at flux changes • b) V-bubbler successful • c) XR,XL,YO correlated • Larger forces on the foil • „vertical forces“, stabilize chamber width

  3. DC report june_04,J.E. • Larger forces on the frame  larger deformations • How to get „vertical forces“ • Control of the HV to avoid damages during quench • Quench is relatively slow : t > > 1 sec • To fast switch off (chamber HV) is also dangerous : RC(chamber) ~ 10 ms •  switch off time ~ 100 ms We think about ways to test the behavior to quenches, as soon as the Al-frame full size prototype will be completely available

  4. Mounting of Cathode foils DC report june_04,J.E. a) Stretchedcarbon fibers(1000x d=6mm) and deformedROHACELL Pretension forceson frameto simulate carbon fibers and foils, glue fibers b) Position (.1 mm)stretched foils and glue them on frame and ROHACELL c) Cut foil  vertical miniforce on the foil Also z-stability better (^ S 1/expansion coef)

  5. 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

  6. DC report june_04,J.E. wings basis Carbon fibers 110 mm Stesalit 199 mm 331 mm Frame shape • fix dimensions of foils  order • Only wing print + built in LV supply cable • carbon fibers solution (W) and price • modify frame shape to correct in first order for: • basis shape ( first cell) frame height (foil height) edge angle (gluing) tested

  7. DC report june_04,J.E. m target position • Without knowing the exact spectrometer resolution build a target with holes of different sizes • Knowing the exact spectrometer resolution optimize the size of a series of holes and slits on the target to clearly see the holes without loosing too much intensitiesSince the non stopped m seem to have a larger probability to contribute to the background, the edge of the target will not be sharp enough .

  8. 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) Design Manufacturing Assembly Test Milestone

  9. DC report june_04,J.E. Drift Chamber 2004 2005 Feb Mar Apr Mai Jun jul Aug Sep Oct Nov Dec Jan Feb Mar Apr Mai Jun Jul Aug 1 29 30 Foil Preamp cable 30 Simul,design Mod tools 1 frames Print anode 1 tests Other Prints 1 Full Size Prototype,Al Tests anode Beam,quench COBRA beam outside inside Inside COBRA Full prototype Inside COBRA Full Detector (18 DC) support calibration cosmics Design Manufacturing Assembly Test Order Delivery Milestone

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