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Chamber Construction QC at CIEMAT
B. de la Cruz
CIEMAT (Madrid)
CMS Week June 2002
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
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 CruzCIEMAT (Madrid)
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
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 blockposition for the different SL at the different construction tables.
B. de la CruzCIEMAT (Madrid)
Change in positioning/measuring methods
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
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 CruzCIEMAT (Madrid)
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
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 CruzCIEMAT (Madrid)
SLThickness
(mm) (mm)
1 53.88 0.13
HC 127.5 0.22
Z 53.47 0.22
2 53.59 0.14
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
Chamber Thickness
SL & Honeycomb
thickness
for each chamber
B. de la CruzCIEMAT (Madrid)
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
Chamber Thickness
B. de la CruzCIEMAT (Madrid)
Ideal chamber thickness: 287.9 mm
Measured thickness:
288.3 0.2 mm
Very good agreement of total chamber thickness
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
Chamber Thickness
B. de la CruzCIEMAT (Madrid)
Comparison of chamber thickness
with & without fixing.
Chamber deformation is ~100-200 m.
Construction process is correct
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
Chamber Thickness
B. de la CruzCIEMAT (Madrid)
Chamber planarity (m)
Chamber with fixing released
Chamber fixed
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
Wires Position
Residuals on wires position measurements for SL built at 2 different tables
Layer 1 Layer 2 Layer 3 Layer 4
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
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
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
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 CruzCIEMAT (Madrid)
Muons DT QC Meeting - June 2002 CMS Week
June 10th, 2002
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 CruzCIEMAT (Madrid)
