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G. Passaleva Roma - July 28, 2004 Status of MWPC production site in Florence G. Passaleva
G. Passaleva Roma - July 28, 2004
Status of MWPC production site in Florence
G. Passaleva
G. Passaleva Roma - July 28, 2004
InfrastructureWiring machine in the clean room Consolle of the wiring machine
View of the open area and the “gray room” Yunshan in the “gray room” picking up panels for measurements
G. Passaleva Roma - July 28, 2004
Panel gluing1. Panels are checked for planarity…2. …cleaned under the hut with
isopropilic alcohol…3. …glued on the gluing machine with
automatic glue dispensing…4. …measured again after gluing…5. …and stored in the shelf
1
2
3
43
5
G. Passaleva Roma - July 28, 2004
wiring machine
Laser soldering bridge Glue dispensing bridge and wire torque motor
G. Passaleva Roma - July 28, 2004
Assembly tables
Panels wired glued soldered and cleaned are…
1. …measured with WTM…2. …and with WDM,3. tested for HV with the
nAmperometer.4. On the same table we glue side bars
1
2
3
4
Final chamber assembly table (thanks to ROME 2 for the realization of the tools)
3
G. Passaleva Roma - July 28, 2004
Quality controls: WTM, WDM ,HV test
WDM cameras
WTM hammer laser spot and photodiode HV connections and nAmperometer
G. Passaleva Roma - July 28, 2004
Building chamber 1
a) Wiring machine enters the clean room
c) Placing the spacers…
b) Gluing the top bars…
d) The chamber is ready to be closed
We built ch1 to go through the full production chain.
The WM placed in the clean room on the 28th of June
The chamber was closed on July 10 and brought to LNF the 13th.
Ch1 was built with the very first panels assembled. Panel L1 in particular was one the first glued with the automatic gluing machine
Gap A was severely leaking (most probably due to bad gluing of the HVbar see above) and needed to be sealed.
Several wires needed to be replaced ( repair procedure tested)
G. Passaleva Roma - July 28, 2004
Building chamber 1
Fernando checks with the spacers the clamping strength
The chamber is closed
G. Passaleva Roma - July 28, 2004
Results on chamber 1Test made @ LNFMany thanks to M. Anelli !
HV: 2.6 kV.Expected current: 100 nA
Gap A was leaking from one corner (probably hvbar not well glued)
Gap B looks reasonable
Gap C is not uniform and the gain is too low
Gap D looks more uniform but in fact there is current limitation set by Mario !!!!
G. Passaleva Roma - July 28, 2004
Building chamber 2
Two panels (701,1255) already wired,soldered and tested
Two panels (706,1027) glued and measured
Plan to close ch2 by the end of this week
G. Passaleva Roma - July 28, 2004
Building chamber 2: HV bars gluing
2.44 2.47 2.50 2.52 2.52 2.47 2.54
2.53 2.48 2.50 2.50 2.55 2.49 2.47
2.47 2.43 2.46 2.45 2.43 2.46 2.44
2.46 2.47 2.46 2.42 2.42 2.43 2.47
Hv bar height after gluing. Measurements taken near the spacer holes with a comparator.Yellow: panel #706 (first batch)Green: panel #1027 (last batch)
G. Passaleva Roma - July 28, 2004
Building chamber 2: WTM
Panel 1255 Panel 1255
Mean=63 gSigma = 2.5 g
Panel 701
Detailed analysis from raw data
Panel 701Display of WTM program
G. Passaleva Roma - July 28, 2004
Building chamber 2: WDM
Panel 701 camera 1 Panel 701 camera 2
G. Passaleva Roma - July 28, 2004
Building chamber 2: WDM
!!!Panel 701, camera 2
8 9 10 11
G. Passaleva Roma - July 28, 2004
Building chamber 2: WDM
Panel 1255 camera 1 Panel 1255 camera 2
G. Passaleva Roma - July 28, 2004
Building chamber 2: HV test
Measurements taken with the LNF nAmperometer.
Panel 1255
Panel 701
G. Passaleva Roma - July 28, 2004
Road towards the PRR
• At the moment the main missing item is (still !!!!) the laser soldering (even though it is finally converging)
• Ch 2 will be closed this week
• We will try to close another 3 chambers by the end of august (test all or some at LNF ?)
• Clearly, we want to understand well all the problems that are arising while building our first chambers
