ESB Meeting
February 4, 2025
Chair: Zisis Papandreou
Attendees: Maria Żurek, Norbert Novitsky, Wouter Deconinck, Tegan Beattie, Tom O’Connor, Henry Klest, Bobae Kim, Minho Kim, Shin Hyung Kim, Jeongsu Bok
Agenda
- Presentation by Zisis on the status and tasks related to the End-of-Sector Boxes.
- Q/A session and roundtable discussion.
- Next meeting.
Minutes
- Zisis presented slides: highlights:
- The GlueX BCAL and BIC were contrasted. BCAL was a simpler design, as it is a mono block PbScFi detector, as opposed to BIC which is a hybrid, and in which the AstroPix layers interrupt the PbScFi. Also, BCAL did not use optical cookies and rather had an air gap between the PbScFi and the light guides, that makes dismounting the BCAL ESB a lot easier.
- The Light guide designs and prototype machining were discussed. Tegan mentioned that there are 2 types of trapezoidal-to-square designs. Zisis reported that there appears to be a difference between machining extruded acrylic and cast acrylic. This is being investigated by Ross Machine Shop (RMS). Production: the light guides will be glued first and then the ETC cards will be mounted. Shin Hyung mentioned that light guide work is ongoing in Korea and that a presentation will be given next time.
- Q (Sasha): Will the different light guide shapes be tested? A (Zisis): yes, we plan to test light guides from Layers 1, 6 and 12, as representatives of the differing shapes as one moves out radially.
- Q (Wouter): is the acrylic material tested for transmission before machined into a LG? A (Zisis): that has not happened yet but it is the plan to do so.
- The mechanical assembly designs by RMS were shown. These had assumed space to insert bolts from outside the ESB towards its length, for mounting. This will not work with the tight space in the inner radius between BIC and the DIRC. A design will be pursued where the ESB comes back a little bit (1-2cm) before lifting outward radially, for servicing. This will be prototyped and tested, and we need to see how the optical cookies behave (whether they stick onto the LG or the SiPM window).
- Norbert described the ideas behind the design of the CALOROC. Traces from the SiPM will go along the green board (see presentation slide 13), and connect to the blue board, without being amplified or summed. The blue board will take care of this. Norbert will interact with Aram on the SiPM parts. Zisis pointed out that sufficient space is needed on the sides of the AstroPiX ETC holes in the tree board, for the SiPM traces to be routed form the SFILs to the upper part where the blue board is located. Maria emphasized the need to have plug-n-play SiPMs on their own boards, so we can connect them in different configurations without having to reflow then in an oven each time.
- The next meeting will be on February 18. Presentations and updates are encouraged.
