sPHENIX HCal discussion

["Lajoie, John G [PHYSA]" <lajoie AT iastate.edu>]

Hi Eric, 

For my $0.02, I like keeping symmetry at the detector level so I would go 
with 24/24 and keep north/south ends together at that level. 

John


John Lajoie
he, him, his
Professor of Physics
Iowa State University
 
(515) 294-6952
lajoie AT iastate.edu

-----Original Message-----
From: sPHENIX-HCal-l <sphenix-hcal-l-bounces AT lists.bnl.gov> On Behalf Of eric 
mannel
Sent: Tuesday, December 29, 2020 1:14 PM
To: sphenix-hcal-l AT lists.bnl.gov
Subject: [Sphenix-hcal-l] iHCal Interior signal cables

Folks-

Some time ago, we agreed that we would bring 24 signals out the north and 24 
signals out the south end of the iHCal.  The implications of this are that we 
would need to run 1 16-channel and 1 8-channel cable from the iHCal and plug 
2 8-channel iHCal channel cables into a singe connector on the digitizer 
board. This balances the cabling north/south.  An alternative would be to 
route 32 channels to one end and 16 channels to the other.  The implications 
here are which end do you route the 32 channels, all north or all south? 
50/50 and hope you get all the modules correctly assembled and installed.  
And just to be completely open, there is a small difference in timing.  For 
the case of
24 North and 24 south I estimate that the timing difference is going to be of 
oder 7 nSec or ~1/2 a digitizer timing bin. If we go with with 16 and 32 
channels N/S then the difference will increase by by 3-4 nSec. For analysis, 
I don't think this is an issue, for triggering, again, I don't think it is an 
issue, but I just want it to be on the table.

The reason I am bringing this up is that Frank has sent me the lengths for 
the interior signal cables, and I want to place the order for cables and 
start assembly when they come in. Once I do that the choice is made.  It can 
be changed at the cost of dollars and time to redo cables.

I would like to get a consensus on which way to do it, so I can move forward 
next month with ordering cables and parts.

Eric


--
Eric Mannel, Ph.D.
PHENIX Group
Dept of Physics
Brookhaven National Lab.
631/344-7626 (Office)
914/659-3235 (Mobile)

_______________________________________________
sPHENIX-HCal-l mailing list
sPHENIX-HCal-l AT lists.bnl.gov
https://lists.bnl.gov/mailman/listinfo/sphenix-hcal-l