FYI ------------------------------------------------------------------ Flemming Videbaek Physics department, Brookhaven national laboratory Upton L.I., NY11973, USA Phone: (516)-344-4106 FAX: (516)-344-1334 secr: (516)-344-7681 e-mail: videbaek@bnl.gov ---------- Forwarded message ---------- Date: Fri, 30 Nov 2001 17:18:30 -0500 From: Angelika Drees <drees@bnl.gov> Subject: this weekend / Westinghouse Hi everybody, I have good and bad news. Good news is that blue proton beam (1 bunch) is circulating and captured. Lifetime improvements and capture are still being worked on. The weekend will be spent on getting yellow and blue circulating and captured (with the option of colliding beam at injection energy during the nights). On saturday we will dedicate some hours on PLL work (provided beam is stable enough). So far we could not measure more than 30 % polarisation at AGS extraction energy (Gy 46.5). At this point the spin crew is working on beam quality (transverse emittance) rather than polarisation. The bad news is coming from the Westinghouse. Westinghouse motor and generator were inspected today by a GE expert. Rotors and brushes on the motor side show significant damage where the graphite brushes started scratching into the rotor material. It is unclear at this point how much more than a few days the Westinghouse can be operated safely. A repair would probably take approximately 1 week (first guess) :( :(. This issue will be discussed first thing monday moring with the chief engineer. I'll let you know as soon as this is settled how we're going to cope with it. Since any planing strongly depends on the outcome of this discussion, I'll not add a preliminary schedule for ring access next week. However, in case the Westinghouse repair can be delayed, a minimum of 30 minutes access will be granted to STAR for a BBC recabling on monday. In any case, have a nice weekend, -- \|/ Angelika (.~.) o0(_)0o ----------------------------------------------------------- Angelika Drees (Collider-Accelerator Department, AP group) BNL, Building 911b-210 work: (631) 344 2348 FAX: (631) 344 5954 home: (631) 474 3884
This archive was generated by hypermail 2b30 : Fri Nov 30 2001 - 17:30:36 EST