Status of LNF production

1
Status of LNF production

• Emiliano Dané - Carlo Forti - Alessio Sarti

• Chamber 48 closed yesterday
• We think to produce 56 or 58 chambers

2
Production rate

• Average production rate 2 chambers per week

3
Data of HV test in air

• First measure of current

• Last panels draw current

4
Panel cleaning

• Lapping machine before HV bar gluing
• Lapping machine before assembly
• Use of brush with isopropylic
• New lateral bars

5
Use of cover

• Cover is positioned on panel just after gluing in
  the winding machine
• Covers are useful to protect the wires during
  soldering and panel preparation
• Cover in fixed on panels with an Aluminium
  sellotape to avoid that smoke from soldering goes
  on wires

6
HV test in air

• Now the HV test in air is good
• Slow current decrease
• There is no evidence of a direct relation between
  the results of the HV test in air and the
  behavior of the same panel in the assembled
  chamber, with gas mixture
• This test is useful in identifying big problems
• Another table of HV test in air will be prepared.

7
The other stations

• Winding machine OK
• Panel soldering OK
• Panel preparation OK
• WTM OK
• Chamber assembly the closing pressure was too
  low in chamber 45
• Gas leakage see next slides
• Source test see Carlo Fortis talk.

8
Production rate

• 2 chambers closed last week

9
M3R3 end of production

• The end of M3R3 producition is expected in the
  middle of September to produce 58 chambers
• Third gluing machine will be ready in few days

10
End of total production

• The end of all productions is expected in July
  of 2006
• In this plot there are 7 weeks of holidays

11
Gas leakage test _at_ LNF

• Scheme of the system
• Picture of the system
• Reference chamber measure
• Measurement procedure and software
• Measures

12
Scheme of the system

• Overpressure is applied to two chambers
• Isolated reference volume (for the absolute
  method)
• Sensor of external parameter (Temperature and
  Pressure)
• Difference of Sensor_1 and Sensor_2 by software
• Second sensor is used in order to check the ref.
  chamber

13
Picture of the system

• Chambers are put in a box in order to uniform the
  temperature
• The box is in the clean room

• In the clean room the temperature varies from 23
  C to 26 C

14
Reference Chamber

• Measure of the reference chamber at constant
  temperature (23.80.1C) use the bottle and is
  not sensitive to the external pressure

15
Measurement procedure

• Apply to the chambers (test and ref.) an
  overpressure of 5 mbar
• Measure the drop of reference chamber and
  chamber to test
• Test length 1 hour

Drop of chamber to test
Drop of reference chamber
External temp and pressure
Subtraction between test and reference
16
Measures

• Estimated error 0.2 mbar
• Measured chambers with leak problems 3, 22,34.

17
Conclusions

• Problems with the HV test in air solved
• New procedure to clean panels is good
• Production rate is normalizing to 2 ch/week
• Setup of gas leakage test is OK
• No leak problem for last chambers

18
Measure repeatability
19
Influence of temperature on ?p

• Measure without bottle
• Same behavior of two chambers by temperature
  variations
• In this measure the pressure was 9931 mbar

20
Temp and press of clean room

• In the clean room the temperature has variation
  from 23 to 26 degree in 1 day
• In 1 hour the temp varies sligthly

21
The Gay-Lussac law
A volume costante

• Sperimentalmente 8.43 mbar/ C
• Teorico 3.3 mbar/C
• La differenza e dovuta allimprecisione dei
  sensori!
• Il piu preciso e quello che misura il ?P