U.S. ATLAS HL-LHC Upgrade Level 2 and Deputies-NSF only Management Mailing List

[Elliot Lipeles <lipeles AT hep.upenn.edu>]

Here are the trigger responses...

On Tue, Jul 30, 2019 at 6:33 AM mark oreglia <oreglia AT uchicago.edu> wrote:

Here are answers to the Tile questions (also in pdf format attached).


=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Tile Calorimeter



20) In your documentation, you describe simplifications of the Tile
ELMB2 motherboard.

     Can you explain what allowed this simplification and if it has any
impact

     on the performance of the circuits?



21) What is the magnetic field at that location in ATLAS?  Have the
components been

     tested in that field?

For the fingers, we have up to 20 Gauss in normal fingers and up to 50
Gauss in some special fingers.
The transformers we use on the bricks are rated for up to 100 Gauss.
But we also have a few inductors in the bricks.
We are planning to perform magnetic field tests on the entire LV box to
make sure that brick’s performance
would not be affected under magnetic field.

The Main Board has already been tested in magnetic fields 20 times
higher than the ambient field.



22) How will the experiment pilot inform the production?  Does the
production start

     before that pilot program sees beam?

The demonstrator drawer inserted in ATLAS is primarily a field test of
the mechanical structure, power dissipation
and ambient noise. These have all passed.  Going forward, the
demonstrator provides a platform for testing the back-end electronics,
communication of slow controls, and trigger configurations.



23) Does the long board get extensive temperature cycling?  Are their
hidden vias?

The Main Boards are burned-in at 60C for 5 days as part of the
production process. We have not experienced
any temperature related failures on the 20 boards produced so far. Yes,
there are hidden vias on this 14-layer board.



24) Are there really fuses in the low voltage power supply?

We do not have any fuses on the bricks themselves. But the 200 V input
is being distributed to the bricks
through a fuse board in the LV Box, with individual fuses for each
brick. There are also some fuses on
the output voltage of the bricks, which are located on the mainboards.
These are supposed to disconnect a
faulty mainboard side from one brick.

_______________________________________________
Usatlas-hllhc-l2deputymgmt-nsf-l mailing list
Usatlas-hllhc-l2deputymgmt-nsf-l AT lists.bnl.gov
https://lists.bnl.gov/mailman/listinfo/usatlas-hllhc-l2deputymgmt-nsf-l

Attachment: FDR DR HW1 Trigger.pdf
Description: Adobe PDF document