1. Chamber Construction QC at CIEMAT B. de la Cruz CIEMAT (Madrid) CMS Week June 2002

2. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Summary  Corner Blocks Position : Measured for the first time  Chamber and SL thickness: First measurements  Wires positions & tensions  SL tests (gas, HV, noise...)  Public information B. de la Cruz CIEMAT (Madrid)

3. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Corner Blocks Positions Most reliable corner blocks are 1 & 4, as they are close to the reference plane (negligible effect of temperature). Rather uniform corner block position for the different SL at the different construction tables. B. de la Cruz CIEMAT (Madrid) Change in positioning/measuring methods    

4. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Corner Blocks Positions Position of corner blocks 2 & 3 is less significative (less control over temperature effects). Small differences in behaviour are observed with the change of procedures in positioning or measuring. B. de la Cruz CIEMAT (Madrid)

5. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Chamber Thickness SL thickness measured when assembling chamber. Results on 10 chambers at CERN. Ideal SL thickness : 53.5 mm Good agreement with measurements! B. de la Cruz CIEMAT (Madrid) SL Thickness (mm)  (mm)  1 53.88 0.13 HC 127.5 0.22 Z 53.47 0.22  2 53.59 0.14

6. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Chamber Thickness SL & Honeycomb thickness for each chamber B. de la Cruz CIEMAT (Madrid)

7. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Chamber Thickness B. de la Cruz CIEMAT (Madrid) Ideal chamber thickness: 287.9 mm Measured thickness: 288.3  0.2 mm Very good agreement of total chamber thickness

8. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Chamber Thickness B. de la Cruz CIEMAT (Madrid) Comparison of chamber thickness with & without fixing. Chamber deformation is ~100-200  m. Construction process is correct

9. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Chamber Thickness B. de la Cruz CIEMAT (Madrid) Chamber planarity (  m) Chamber with fixing released Chamber fixed

10. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Wires Position Residuals on wires position measurements for SL built at 2 different tables  Layer 1  Layer 2  Layer 3  Layer 4

11. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Wires Tension Wires tension measurements for SL built at 2 different tables  Layer 1  Layer 2  Layer 3  Layer 4 Tension Width (N) vs SL number

12. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week SL Tests  Gas Tightness: Overpressure test performed & time constant measured.  HV Test in air: HV at 4000/ 2000/ -2000 v for wires/ strips/ I-beams.  HV Test in gas: HV at 3600/ 1800/ -1400. Record disconnected cells, with info on whether it is wire or cathode (right-left).  Cosmic Data: Data taken at HV= 3600/ 1800/ -1200 (sometimes –1440) v. Info recorded:  TDC spectrum for each cell.  Mean Timers right-left (every cell, all together).  Efficiency per cell.  Noise: Measured at HV = 3600/ 1800/ -1200 v & Thresholds 15 (sometimes also 50, 95) mV. Info recorded:  noise/cell & mean value for each plane  # of cells with noise > 250, 500, 1000 Hz. B. de la Cruz CIEMAT (Madrid)

13. June 10th, 2002Muons DT QC Meeting - June 2002 CMS Week Public Info  Public Information on chamber construction and tests is available at http://wwwae.ciemat.es/cms/QC.html Ascii files located there; more info will be coming (missing words).  For the QC Summary Table we will be sending txt files with data required (concerning Wire position, wire tension, reference block position) and now also SL & chamber thickness. B. de la Cruz CIEMAT (Madrid)