Form Factor Constraints for ECT at ePIC Collaboration Meeting 2025

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Discover the form factor constraints for the Electro-calorimeter Trigger system at the ePIC Collaboration Meeting in Frascati, Italy. Explore the concept overview, sector layout, and front views, along with open questions affecting FEB form factor.

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FEB Form Factor Constraints for ECT Stefano Gramigna (INFN Roma 2) Seungjoon Lee (jefferson Lab) ePIC Collaboration Meeting Frascati, Italy Jan 20-24, 2025

ECT Concept Overview 4 quadrants per disk, staggered in Z and overlapping Full angular coverage around the beam pipe 14 mm AA overlap between neighbouring sectors Service outlets at 0 , 90 , 180 , and 270 Lepton side Envelope 97 1000 125 Hadron Side Envelope 170 1000 155 Parameter Active area 123 900 / Active Area 206 900 / Innner Outer Z *Subject to changes upon modification of the beam pipe design ePIC Collaboration Meeting Jan. 2025 2

ECT Concept Overview 4 quadrants per disk, staggered in Z and overlapping Full angular coverage around the beam pipe 14 mm AA overlap between neighbouring sectors Service outlets at 0 , 90 , 180 , and 270 Lepton side Envelope 97 1000 125 Hadron Side Envelope 170 1000 155 Parameter Active area 123 900 / Active Area 206 900 / Innner Outer Z *Subject to changes upon modification of the beam pipe design ePIC Collaboration Meeting Jan. 2025 3

ECT Sector FEB Layout The service rim can accomodate 12 FX20-140P connectors 6 FEBs per quadrant reading 1524 channels (both views, 600 m pitch) ePIC Collaboration Meeting Jan. 2025 4

FEB Form Factor Constraints Two 110 x 42 PCBs, separated by 10 mm Surface for components is about 77% w.r.t. CyMBaL FEBs Other constraints: Support mechanics Cooling Gas lines Still need to be factored in and may introduce more limitations ePIC Collaboration Meeting Jan. 2025 5

ECT LD Overlap Region Top View Some of this clearance is likely to be sacrificed to fit support mechanics ePIC Collaboration Meeting Jan. 2025 6

ECT Sector Front View ePIC Collaboration Meeting Jan. 2025 7

Open Questions Potentially Affecting FEB Form Factor ELECTRONICS Do both the ASICs and the DC-DC converters require active cooling? What s the critical angle of the VTRX+ pigtail and chosen fiber optics cables MECHANICS What to use as mounting points for the disks and where are these located in the apparatus? Is there space outside the assigned envelope we can occupy with support mechanics and services? More to come as we progress towards a working design for the ETI ePIC Collaboration Meeting Jan. 2025 8