Implications for timing system of possible CUC Cryo-Mezzanine move - - PowerPoint PPT Presentation

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Mar 08, 2023 241 likes •315 views

Implications for timing system of possible CUC Cryo-Mezzanine move David Cussans Upstream DAQ regular meeting 14/Jan/20 Current Plan Cross-check and hot-swap redundancy by Two antenna (on at top of each shaft) Two GPS

SLIDE 1

Implications for timing system

f possible CUC → Cryo-Mezzanine move

David Cussans Upstream DAQ regular meeting 14/Jan/20

SLIDE 2

Current Plan

Cross-check and hot-swap redundancy by

 Two antenna (on at top of each shaft)  Two GPS receivers in CUC  Normally one antenna-→ one GPS receiver

Cross check between two systems

 Option of third, free-running, Rb/Cs clock to act as “tie

breaker” if two systems start to diverge.

All four modules SP, DP, MoO served from CUC

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SLIDE 3

What is the Issue?

Moving DAQ out of one central location breaks current scheme
Proposal being considered: one “DAQ hut” for each module
Number of different solutions. Three considered

1)Install current scheme in one of the four DAQ huts and run fibres to other 3 * Not nice - lots of fibre… 2)Keep GPS receivers in CUC in a small rack 3)Put GPS receivers on surface * Advantages

remove need for analogue transmission of GPS signals (reduces

cost)

puts more electronics on surface where it is more easily accessible.

* Disadvantages

Need more microTCA crates ( 2 per SP detector)
Need more fibres down shaft (but we should have many)

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SLIDE 4

GPS on surface

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10 MHz IRIG-B IEEE1588... GPS Receiver... DAQ &... Master... MCH AMC Timing... Direct... Timing... AMC Timing... Timing... AMC Timing... Timing... AMC Timing... Timing... AMC Timing... Timing... AMC Timing... Timing... uTCA Crate... Setup/Control/Monitoring ( 1 GBit/s ) Experiment... Crates in DAQ Hut 1000Base-BX... 1000Base-BX 1:2 Passive... 1:8... To timing endpoints... Master... MCH AMC Timing... Timing... AMC Timing... Timing... AMC Timing... Timing... AMC Timing... Timing... AMC Timing... Timing... AMC Timing... Timing... IEEE1588... GPS Receiver... 10 MHz IRIG-B Fibre to hot-swap system Direct attach cable... link to Yates GPS Interface 1000Base-BX... link to Ross links... GPS Interface DAQ "Hut" on SP Cr... Surface Ross Yates Ethernet...

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Content

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