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

[John Parsons <parsons AT nevis.columbia.edu>]

Here are LAr draft replies.  We can try improve/shorten
a bit during lunch, but have to stop now for the
mgmt review session.

                John

On 7/30/19 9:36 AM, Elliot Lipeles wrote:
> Here are the trigger responses...
>
>
> On Tue, Jul 30, 2019 at 6:33 AM mark oreglia <oreglia AT uchicago.edu 
> <mailto: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
>     <mailto:Usatlas-hllhc-l2deputymgmt-nsf-l AT lists.bnl.gov>
>     https://lists.bnl.gov/mailman/listinfo/usatlas-hllhc-l2deputymgmt-nsf-l
>
>
> _______________________________________________
> 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

--
______________________________________________________________________

John Parsons
Nevis Labs,             Email: parsons AT nevis.columbia.edu
 Columbia University    Phone: (914) 591-2820
P.O. Box 137            Fax: (914) 591-8120
Irvington, NY 10533     WWW: 
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.nevis.columbia.edu_-7Eparsons_&d=DwIDaQ&c=aTOVZmpUfPKZuaG9NO7J7Mh6imZbfhL47t9CpZ-pCOw&r=Z0wuTxQYnTTMlYma4lGZlO3skeCGVBrGGurYkWbhJsJuG5HaY82rmCNSdFOV7C4Z&m=-_CFYTaipFBM6o0ojYhUaMUd5mbUn2pX7m7e56k_LYQ&s=kKivY7UHmgkeeIEg83LUtyoBqfqmvPaYEHvh3TVTDyc&e=
    

______________________________________________________________________

Attachment: LAr questions.docx
Description: application/vnd.openxmlformats-officedocument.wordprocessingml.document