Super-short update on Ports, Laser-HV interface in ProtoDUNE-SP (II): mainly summarizing some email discussion with Bo � 1
ProtoDUNE-SP ports � 2
ProtoDUNE-SP ports Which one of these 4 are good for FC penetration? Outside the FC � 3
ProtoDUNE-SP ports Interfere with the FC I-beams and should be avoided � 4
ProtoDUNE-SP ports seem doable, but 1. they are quite close to the endwall such that require shortening the 90 degree bent profiles, which may make the PE cap difficult to install. If you can shift the laser head down stream a few cm, it may clear the endwall FC 2. Blocked by ground planes, but for PD-II there is plan to shorten the ground planes? � 5
ProtoDUNE-SP ports These are CE ports, but can be explored. Main issue is again interference with ground planes, but there is plan for shortening them for PD- II it seems? If that is the case, these would be very desirable — need to check with CE folks on rearrangement of ports b/n CAL and CE Note for crossing tracks, one would want 2.2 & 2.4, or 2.6 & 2.8 � 6
ProtoDUNE-SP ports Would be good to explore coverage through FC gaps or side penetration Blue one: port size smaller than FD-SP , not desirable Orange one: same Outside size as FD-SP , but the FC currently may have a camera in it (?) and so can be swapped with the red one for laser. Only caveat: orange one is closer to cathode and side penetration is risky, but we were not planning that anyway Use orange one for testing the dual- rotary system � 7
Moving Forward • Continue to explore the port scenario in PD-SP-II • Started communication with PD-II point of contacts (Serhan, Filippo) about assignment of ports and planning • For the purposes of laser system design development, use the current ProtoDUNE FC/port design • Expect A more detailed talk from Bo in the near future on plans for PD-SP-II FD/HV design and laser-HV interface in PD-SP-II � 8
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