ePIC pfRICH electronics mailing list

["Camarda, Timothy" <tcamarda AT bnl.gov>]

 

Hello,

 

I am working on the power services requirements for the pfRICH detector. I need to verify if I understand the specifications as provided in the online services table here:

ePIC.Interface Control Document for Services.052023.xlsx

 

 

Here are my questions to help clarify things for me:

 

1. is the FE board also referred to as “sensor”?
2. why is it stated for FEE quantity “7 +4 * 68”?

 

 

Power requirements:

 

69,632 channels /  256 channel ASIC = 272

 

They have 4 ASICS specified per sensor =>  272/ 4 = 68 sensors

 

EICROC power: 1mw / channel x 256 => 256mw => with contingency: 300mw

 

We have 4x per sensor => 0.3W x 4 ASICS = 1.2W per sensor =>  1.2W/ 1.2V =  1A  per sensor

 

That yields ~ 70A total for the LV system => 84W

       With power conversion losses we can figure ~ 100W         total

 

3. Why 7x 40A power lines?

 

4. Is it planned to have power conversion on the sensor board…or will 1.2V power be fed directly from PSU without any regulation on the sensor side?

 

Thanks,

Tim