1. HV distribution and discussion
Tile week upgrade session
2013 February 1st
François Vazeille
See my talk given at the Tile Upgrade Week of September 2012
and the wiki page written by Gary Drake 1

2. HV Regulation on Drawers
HV Regulation in USA15
Option 0: Full re-use of Tilecal HV
Option 3: Re-use of HV cards
Option 1: New design with COTs
Option 4: New design with COTs
Option 2: New design with RAD-HARDs
Option 5: Commercial system
Option 0: cancelled because of the same
reasons as other electronics suited to LHC
and not HL-LHC (radiations).
Option 2: cancelled because of the cost.
Option 5: cancelled because of the cost.
 3 solutions are kept:
What could be the obstacles ?
Option 1: the equation HV/Radiation
for some components
+ Manpower and cost
Options 3 and 4: the routing of HV cables.
Option 4: Manpower and cost 2

3.  Some information
We cannot consider that the options 1 and 4 (new design) are the same
because of the radiation constraints that will induce a different scheme.
 Is there space for routing cables (Options 3 and 4) ?
What are the needs when using Mini-drawers and 1.2 cm diameter cables?
1 Train of 4 Mini-drawers: 4 cables  1.2 x 1.2 = 1.44 cm2 (square to simplify).
1 Tilecal partition: 256 cables  369 cm2
Whole Tilecal: 1024 cables  1474 cm2
- Numbers submitted to Sergei Malyukov
Hello Francois,
at LS1 we plan cabling works, so can pull the cables, as many as
you would need.
I believe that later at LS2 one can install new cables for Tilecal,
sough not sure that it still be me who will organize it.
When you have detailed info on cables to be installed at LS1,
please send them to me, including date when you would need cables on place.
Regards,
Sergei.
Then several mails withy Dominique and myself
 Easier for LB than for EB, but nothing is forbidden 3