[Halld-cal] Bcal LED inventory

[Elton Smith]

Dear collaborators,

In preparation for completing the gluing of light guides onto all 
modules, we have made an inventory of all the hardware and components 
that are needed to complete the task. We have checked the count of LED 
boards and strips that are needed. While going through this exercise we 
realized that when we ordered the monitoring system, we ordered a total 
of 390 strings and 3900 LED boards, sufficient for 48 modules and 6 
spare strings and 60 spare LEDs. This does not cover the number required 
for the 49th module. We should consider what we wish to do about 
instrumenting the 49th module. Clearly it would be good to have a 
working ectype.

The count was completed when there were 12 modules left to glue (the 
number is now 10). This count includes the extra 49th module.

Strips:
Required    ordered   operational     failed   needed for 49 modules
       96             94              86             6 10(*)

(*) Athens has some spares to compensate for our losses.

LED boards
Required   ordered   operational      failed   needed for 49 modules
     960           940            877            56         27(*)

(*) Assume that the 56 failed boards can be repaired.

In summary, it appears that we will be able to instrument the 48 modules 
assuming we can repair a few of the damaged LED boards. However, to 
completely instrument the 49th module, we would have to obtain 
additional boards.

We can discuss this at our next Bcal readout meeting.

Cheers, Elton.


-- 
Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave STE 16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax