From kazuhito@hepl.phys.nagoya-u.ac.jp Thu Oct 13 09:02:47 2011 Date: Fri, 14 Oct 2011 04:02:34 +0900 From: Kazuhito Suzuki To: pid_up@bpost.kek.jp Subject: Access window size Dear all, I am sorry for the delay to send this out, but let me draw your, especially Hawaii colleagues', attention to what have discussed in the Outer Detector Horizontal Meeting (ODHM) held on last Tuesday. http://kds.kek.jp/conferenceDisplay.py?confId=8166 Kohriki-san presented the current designs of IDS and TOP/CDC jigs. His presentation slides and an 1-page file made after the meeting are attached below. The slides show the cross-sectional view of TOP and CDC and the r-phi views of the ECL flange (p.6-7), the bwd IDS (p.8-9) and the fwd IDS (p.10-11). They seem to be identical with the ones I have shown in the past PID meetings, but the r-phi drawings may have more detailed information and/or possible ideas of IDS notches. There are two things we should specially pay attention. 1) Access window size (p.1-2), 2) Notches on the bwd IDS for cabling (p.8-9). For 1), as we agreed in the special Hawaii-KEK-Nagoya meeting, we need to fix the access window size, consequently the parameters A, B and C in the drawing, by the end of Oct. Currently the design expect three options. It seems we want the parameter B (access window z-size) be 135 mm. We should make sure if this number is OK as much as possible. We should also have our estimation on the access window width. *We are required to tell our decision on the A, B and C numbers at the next ODHM to be held on Tuesday, Oct. 25 (10:00-, JST).* Hawaii colleagues, please let us know the best estimation on the parameters by then. For 2), Kohriki-san showed a possible idea of "two large inner-side notches" for the cables from a single TOP module. The original idea of "four outer-side notches", where each notch aligned to a notch on the ECL flange, is also shown in the 1-page file. He wants to know what we want. Similarly, two possible ideas of the notches on the fwd IDS are shown in the slides (p.10-11). In my understanding, possible use of the fwd notches are for the dry air piping and the optical fiber cabling (for laser calibration). We need to discuss the notch designs shortly. In conjunction with the notch designs, we need a realistic estimation of the cabling space/path. This might be asked in the next ODHM, too. Best, -- Kazuhito