Proposal for New Hardware for the EMTiming system 
Original: June 29th, 2004, Updated July 9th, 2004
David Toback 


We need new hardware for the EMTiming system for the following reasons:

1) There is a need for 8 additional Transition Boards and ASD's so that we may 
have each CEM wedge having its ADMEM lines and Timing lines go into the same 
crate.

2) The current transition boards need to be remade because of mechanical flaws 
which were not originally detected, as well as for damage done to them during an 
attempted modifications. 

3) Since all the spare long cables will be used for the new ASD/TB boards, we will 
need to buy 4 spare long-cables.


Other facts which impact on the plan: 

- A technician has successfully removed the LEMO bulkhead boards from the 
current TB's. The estimate is that this is ~15 minutes/all 3 boards. Note: The 
TB are made of two types of board: the main PCB, and 3 bulkhead daughter boards. 

- Fermilab recognizes that it is responsible for many of the mechanical problems 
with the TB (and front panels) and is willing to take responsibility for fixing 
the problems (including paying for new boards). Since they feel strongly that we 
not just modify the boards _AND_ they are willing to pay for it, it is natural 
that Fermilab deal with the problem and pay for it. Also, since there may be 
multiple iterations in the drawings, having it all at FNAL would be helpful.

- Since there are no issues with the bulkhead boards or the ASDs, those should 
be re-made in the same way and again by the INFN group.

- It is essential that the process move as quickly as possible, so that the 
boards can be ready for the installation which is scheduled to start in late August. 
Here as much parallelism as possible is desirable. This works well as the 
Italians can finish the ASD quickly and FNAL can work on the TB. Furthermore, 
having the TB done in the US allows us to take advantage of board companies 
which work during August. It also reduces the number of boards which need to go 
through customs and caused delays last time.

- We have 27 working TB's and ASDs for the full CEM installation; 4 of them are already 
installed on the detector and working.

Proposal:

- TAMU people will test all the electrical properties of the new boards.

- FNAL people will be responsible for all the mechanical properties of the 
boards.

- FNAL will cover the full of all cables, boards, connectors, front panels and parts. 
An estimate is provided below. 

- INFN will get the TB drawings to FNAL as soon as possible.

- FNAL will acquire the parts for the main TB PCB (transformers, capacitors 
and resistors). http://hepr8.physics.tamu.edu/hep/emtiming/ASDTB/parts.html

- INFN will build the bulkhead boards. 

- FNAL will buy all the new connectors and front panels, either fixing 
or replacing the damaged old ones, and be responsible for installing them as was 
done with the last round of ASD/TB's.

- FNAL will make enough of the main TB PCB's to cover the entire detector should 
we need any TB's from the plug. Only the required number will be fully stuffed. 
We will not touch anything in the plug unless absolutely necessary. We will make 
enough spares to cover a full crate swap, plus 2 more, just in case those 
actually get used.


Board/Parts Counts with institutional building responsibility:

1) Build 10 additional ASD's: 8 boards + 2 spares *** INFN

2) Build 53 PCB of the main TB: 32 CEM + 16 PEM + 5 spares *** FNAL

3) Stuff 38 PCB of main TB: 32 CEM + 6 spares *** FNAL

4) Build and stuff 30 bulkhead boards: 3/TB * (8 boards + 2 spares) 
*** INFN

5) Separate parts: backplane connectors for 10 ASD's, 38 TB's; Front 
panels for 10 ASDs, 10 TBs; 10 front connectors for 10 ASD *** FNAL

6) TB parts (transformers, caps and resistors) for 38 TBs *** FNAL

7) Buy 4 new long cables **** FNAL

The total cost is ~$15k for ASDs, ~$20k for all TB stuff, $2k for long 
cables and $10k for TDC (which are recycled). For more details see 
hepr8.physics.tamu.edu/hep/emtiming/management/emtiming_cost_estimate_extra_hardware2004.pdf