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EPIC Far-Forward - B0 subsystem meeting
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US/Eastern
Description
Wiki: https://wiki.bnl.gov/EPIC/index.php?title=FarForward
Join ZoomGov Meeting
https://bnl.zoomgov.com/j/1602996456?pwd=NHlISDV4bWpDTlZVZjFWNzdkMEtBZz09
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Short-term goals (few weeks)
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New B0 beampipe design exists and needs to be imported into DD4hep.
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Alex can put in the new beampipe into DD4hep by next week.
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Also needs to include the exit window from the IP.
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For the EMCAL we need to somehow integrate the cooling and mechanical support into DD4hep, at least in a simplified form.
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Yulia will share the current CAD model with Igor and Zvi to start looking into this.
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Short-term new beam pipe + modified CURRENT detector geometry in DD4hep.
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Do some studies with the “ideal” geometry + new pipe before updating the geometry to match CAD for the sensor layout.
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Tracker must be 5mm from the edge of the beam pipe.
Longer-term (few months)
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Using the B0 field map vs. using the “ideal” dipole + quadrupole.
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How do our requirements change now that the B0 has worse acceptance than assumed in the Yellow Report?
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1.3 GeV/c is the spec for 275 GeV – need the same for the 10x100 GeV.
Detector Technology
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Tracking:
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Need to freeze the stave dimensions, need to account for the new beam pipe design.
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A stave concept has been drawn up, and initial discussion with an electrical engineer (Steve Boose, BNL) have begun.
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Where do we place the readout?
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2 meters is the maximum length of the cable from the ASIC to the readout card
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Current “easiest” option is to have readout on the disks, pull fibers out of the magnet.
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India is putting the layout together with the RP stave design - will discuss on Monday what things look like.
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Cooling for the B0 AC-LGADs vs. the RP?
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Can we use liquid cooling for the B0? → likely no, and may be overkill
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Igor et al. did some studies on heat dissipation at room temperature in air for the lumi pair-spectrometer.→ Igor will send the slides around
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EMCAL:
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Beginning mock-up of small crystal array to start testing how to mount electronics onto crystals with our installation constraints.
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4 + 1 crystals available to work with for now.
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And also beginning testing with two different types of SiPMs to see what will match our constraints and requirements.
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4x 6x6 (3 with 15um pitch, one with 10um pitch) – how to arrange the channels, still in-progress.
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Cooling for the EMCAL is still an open-issue, important for the crystals, on top of cooling the electronics.
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Integration of calibration fibers/system
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.General engineering:
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B0 mockup is ready.
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Installation sequence:
o Bottom half of EMCAL crystals, then beampipe, then Upper half of EMCAL crystals ( See slides from Charlie). EMCAL electronics and readout will be installed later, after beam commissioning.
o Tracking layers as clam shells, in “open” position while guided to correct z-position then closed into place.
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