FYI, Rhic seems to be making nice progress - we have to make some progress soon to ensure we are ready for beam. It is still too early to say when physics running will start. But I will not be surprised if it happens before Jan 5 at this rate of progress. Flemming -------- Original Message -------- Subject: SPY news update: collisions have begun From: "Kin Yip" <kinyip@bnl.gov> Date: Sat, December 13, 2003 5:47 pm To: "Yip, Kin" <kinyip@bnl.gov> ====== Scheduling Physicist -YIP (ie. SPY) news channel ======== I've been hesitating whether I should write or not this Sat..... but why not ?! (1) Since Thursday afternoon/evening (Dec. 11, 2003), we have had collisions in all RHIC experiments. The ZDC's in the STAR expt. didn't function properly on Thursday but the problems were fixed on Friday. I have seen collision rates higher than 600 Hz in the PHENIX expt. In fact, Sat. morning (3:26 am from the logbook), PHENIX was asking whether the machine people could stay in "store" (the mode of having continuous collisions) for an hour or so but unfortunately, no other experiments were around. PHOBOS has given me a time difference plot of two counters at opposite sides of their first collisions. Enthusiam seems more and more prominent...... (2) On Friday, it was found that a vacuum leak in the bellows of a multiwire instrument "HARP" --- it is called because it looks like a HARP with so many wires --- had developed. The vacuum group has locked the HARP in the retracted position and sprayed/sealed the bellows. When the vaccuum group leader passed my office this Sat. morning, I was told that the vacuum went back to the original level. This HARP cannot be used unless we replace it. We are trying to see how "painful" it may be to have our operation without it. If we need to replace it, a re-baking seems necessary. During the discussion with the Booster experts and the vacuum group leader after the repair work finished late Friday evening, a continuous 28 hour period may be sufficient. This HARP is a useful diagnostic tool. We'll see ...... ====== ======= ====== ======= ====== ======= ====== ======= This SPY news channel solicits YOUR input of any sorts. You'll be paid back with loads of gratefulness :-) Let me know if you want to get out of this private email mailing list. -- Flemming Videbaek Brookhaven National Laboratory Physics Department tlf 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov _______________________________________________ Brahms-l mailing list Brahms-l@lists.bnl.gov http://lists.bnl.gov/mailman/listinfo/brahms-lReceived on Sun Dec 14 20:48:43 2003
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