EC front unit status. S. Ahmad, P. Barrillon , S.Blin , D. Cuisy , S. Dagoret-Campagne , P. Dinaucourt , R. Sliwa , JL. Socha (LAL) A. Ebersoldt (KIT) 8 th progress meeting EUSO-Balloon October 12 th 2012 - APC. Outline. Conclusions from mechanical prototype and actions taken
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S. Ahmad, P. Barrillon, S.Blin, D. Cuisy, S. Dagoret-Campagne, P. Dinaucourt, R. Sliwa, JL. Socha (LAL)
A. Ebersoldt (KIT)
8th progress meeting EUSO-Balloon
October 12th 2012 - APC
Conclusions from mechanical prototype and actions taken
Status of electrical prototype
KIT’s work for TA
Dev plan (tests)
Flexible pcb toward EC-back
HV cables toward HV box
3.1 mm inner diameterDimensions of PDM frame
Radius of the corner : R2.2
Outer and inner diameters
10 and 6 mm
Thickness: 1 mm
Thickness: 3 mm
EC_dynode is 54.5 mm x 54.5mm therefore it will lay on the PDM structure where the distance goes from 55 mm to 53 mm
2 adjacent EC_anodes soldered to the MAPMT pins (going through holes of the EC_dynode) should fit in 53 x 53 mm
The EC_HV soldered to extensions coming from the EC_dynode should fit also in the 53 x 53 mm
It looked ok…
The mechanical prototype was finished 12/07
MATRA people checked if the proto was fitting inside a homemade version of the mechanical structure of 1 EC unit
They observed that the EC_anodes and EC_HV were overlapping with the structure meaning that they were going over the 53 x 53 mm…
Calculations based on the CAD files showed that indeed the dimensions of EC_anode and EC_HV are lightly too much… see following slides.
6 mm (8.32 – 2 x 1.16)
The distance (6 mm) between two EC_anodes is needed to let the flexible cables go through this gap. It was the leading idea of the EC front unit design.
But then the global dimensions are 53.7 x 53.7 mm… we missed that .
How to fix the problem for the EC_anodes
The larger holes on the edge are 2 mm large ones and there is no routing around.
Therefore EC_anode rigid pcb could be reduced significantly by removing the parts
MATRA did that on the mechanical prototype to perform the potting test.
EC_anodes were corrected end of July 2012. EC_HV in September 2012.
In this version, the extension pins coming from the EC_dynode toward the EC_HV will go next to the EC_anodes not anymore through.
EC_anodes were corrected end of October/beginning of November
Top view (fake filters)
Bottom view (cables and screw)
Lateral view 1
Lateral view 2
Lateral view 3
Lateral view 4
Mold 3D view from MATRA
Picture of the mold (2 parts)
After all (reduction of the size of the fake pcbs and removal of the central column), it fits in the mechanical frame
4 pieces produced by MATRA for the mechanical prototype
With fake UV filter as well
Fake pcbs of the EC-front boards