Difference: ThermoMechanical (5 vs. 6)

Revision 62017-07-21 - TomErikHaugen

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META TOPICPARENT name="GlueDocumentation"

Thermomechanical modules (TM)

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  The Hybrids come on a hybrid panel, for the TM modules there are version 1.1 and 1.2 hybrids (1.2 are wider where the HCC is).
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Note: Most pictures are from the first electrical module as this was when I was actually taking pictures. In principle the assembly is the same.
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Note: Most pictures are from the first electrical module as this was when I was actually taking pictures. In principle the assembly is the same.
  IMG_20170405_163228140_HDR.jpg
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  The powerboard is placed between the hybrids. There are multiple different methods used. I will briefly go over them. In short the glue is spread on the sensor, spacers are put between the board and the sensor, the board is placed on the glue, then weighed down over night.
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powerboards.jpg
 Glue Spreading:

The glue is spread by hand by the technician, we used the epolite epoxy with a cure time of 24 hours. There are multple concerns with the glue. There needs to be enough that the bond pads are stable and do not bounce, and there needs to be enough under the coil that it makes good thermal contact with the sensor. There should not be so much that it leaks over and glue seeps onto the top of the hybrids or the bond pads.

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<!-- Image of the glue line spread -->
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Glue_Trial.jpg
  Spacers:
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  1. As Brookhaven suggested we placed kapton tape on the bottom of the powerboards. One piece on each and and one in the middle. This was not trivial to do as we needed to cut and handle small pieces of kapton and place them without damaging the board much. This was done for 9 of the powerboards.
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<!-- Image of kapton under the powerboard -->

2. As Santa Cruz suggested we used fishing line. We cut short pieces and placed in the glue. This seemed to set the height as well and was very easy to do. There is some uncertainty on the thickness of the fishing line.

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2. As Santa Cruz suggested we used fishing line. We cut short pieces and placed in the glue. This seemed to set the height as well and was very easy to do. There is some uncertainty on the thickness of the fishing line.
 
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<!-- Image of fising line in glue -->
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Glue.jpg
  Board Placement:

The board was placed by hand on the sensor. The bond pads for power need to line up between the powerboard and the hybrids, and the power pads at the end of the board need to be close enought that they can be bonded to the test frame.

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<!-- Image of PB placement -->

It is important to note that the guard ring on the sensor is sensitive and should not get glue on it. This will effect the electrical characteristics of the sensor and should be avoided. As such some of the TM modules had the powerboard shifter further back to avoid touching the guard ring at all.

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It is important to note that the guard ring on the sensor is sensitive and should not get glue on it. This will effect the electrical characteristics of the sensor and should be avoided. As such some of the TM modules had the powerboard shifter further back to avoid touching the guard ring at all.
  Weighing down:

The tooling produced at BNL applies pressure to the chips in the center of the PB. The powerboard arcs up so pushing in the middle will flatten it out. The individual legs can be adjusted to change the height of this tooling.

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<!-- Image of BNL tooling -->

We also produced a small piece of tooling that pushes in the center and presses the powerboards to the sensor. This allowed multple gluings to happen at once.

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We also produced a small piece of tooling that pushes in the center and presses the powerboards to the sensor. This allowed multple gluings to happen at once.
 
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<!-- Image of our tooling -->
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PB_Tooling_Top.jpg PB_Tooling_Side.jpg PB_Tooling_Support.jpg
 
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-- Tom-Erik Haugen - 2016-11-29
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-- Tom-Erik Haugen - 2016-11-29
 

Comments

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