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Features and Mysteries of BOL chambers

This agenda discusses the X-ray tomograph results for BOL0, the features of BOL0 and BOL2, and the observations and hypotheses regarding the chambers. It also covers the gluing process, sag compensation, and conclusions drawn from the observations.

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Features and Mysteries of BOL chambers

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  1. Features and Mysteries of BOL chambers AGENDA • Xray tomograph -BOL0 results (Martin) • BOL0 and BOL2 Features (Graziano) • Discussion (All) Marcel Vreeswijk (NIKHEF)

  2. BOL0 - Hypothesis • OBSERVATIONS BOL0 • Y-pitch between inner wire-layers: 20um too large • Y-Pitch between outer wire-layers: only slightly too large • Y-Pitch between multilayers: 75um too small • Hypothesis • Glue shrimp between tubes and spacer? • (2x500um glue gap) • --> measured: <5um effect for 1mm gap • Xplate deforms during gluing. In particular the flange • --> presented today • Additionally: • Re-analysis of BOL0 construction RASNIK readings: ‘cumulative effects’ lead to better agreement! Marcel Vreeswijk (NIKHEF) s

  3. Floppy Xplate wrt tubes =Rotation of unknown relative size @longbeam Longbeam constraints body Xplate locally ‘Tube-length’ bends body Tube direction bends flanges Away from longbeam Marcel Vreeswijk (NIKHEF) s

  4. Sag Adjustment =Rotation of unknown relative size Longbeam constraints body Xplate locally ‘Tube-length’ constraints flanges Tube direction bends flanges Away from longbeam flange bends differently! BOL0 is scanned with sag-adjustment (partially) on! (Longbeam sag is assymetric in BOL0) When we are optimistic: deformation is symmetric for up/down ML. Marcel Vreeswijk (NIKHEF) s

  5. Sag Compensation =Rotation of unknown relative size Longbeam constraints body Xplate locally ‘Tube-length’ constraints flanges Tube direction bends flanges (temporary) Marcel Vreeswijk (NIKHEF) s

  6. XP deformation During BOL2 construction, the flange of the HV xplate was measured with micro-gauges: LBF: Longbeam- Flange BF: Body- Flange For now, BOL2 is still equipped with gauges, located on the inner side of the HV-xplate Marcel Vreeswijk (NIKHEF) s

  7. Start glue Start glue Gluing BOL-0 • Stability Xplates during gluing Layer 1 Yrasnik=2 x Sag Layer 1: dSag=7um Layer 2 Start glue Layer 3 Layer 2: dSag=10um • The sag of the xplates in layer 1 and 2 change in time. • Layer 3,4,5,6: Sag stable Marcel Vreeswijk (NIKHEF) s

  8. Sag Compensation BOL2 Layer 1 Start: -15/2 um • During gluing of • layer 1 and 2, significant changes in xplate sag were observed: • In-stable reduction valves? • Effect of glue viscosity? End: -38/2 um Layer 2 Start: 30/2 um End: 50/2 um 1 deg Marcel Vreeswijk (NIKHEF) s

  9. Conclusions • OBSERVATIONS BOL0 • Y-pitch between inner wire-layers: 20um to large • Y-Pitch between outer wire-layers: only slightly to large: • Effects largely explained by RASNIK measurements during construction. • Flange deformation of order 10um could be ‘baked’ in. • Y-Pitch between multilayers: 75um to small: • Flange deformations of this order are certainly observed. However these deformations appear symmetric and elastic. • Needs more study -> effects of kinematic mounts • direct -in situ- measurement dY of Frascati comb and towers Marcel Vreeswijk (NIKHEF) s

  10. Test @CERN inTomograph (BOL0) Analysis of Martin Woudstra Wire positions RMS 16mm Marcel Vreeswijk (NIKHEF) s

  11. Parallelogram-ness For stability bare spacer Checks distance wrt Comb @ RO side “BOL RO rail Marcel Vreeswijk (NIKHEF) s

  12. Landing-Tool • Problems with lowering gluing tube layers on tube layers due to glue viscosity • Landing tool pre-aligns chamber and ensures flat landing in glue. BOL Tower Effective + Easy Marcel Vreeswijk (NIKHEF) s

  13. Cosmic Ray Stand Marcel Vreeswijk (NIKHEF) s

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