------------------------------------------------------------ Date: Wed Jan 9 16:38:13 2002, Shift: 08:00-16:00 Supervisor: KH, with: EJK Log book#12 pages 33 - 33 Shift Summary: ------------------------------------------------------------ No beam during entire shift. There was an access to allow pp2pp to install their detectors. We took advantage of that opportunity to do some things in the IR. 1. The lead shield in front of BBL #43 was removed as it was no longer needed. 2. The timing of the inelastic triggers was measured and found was found to be off by 8ns, exactly the amount moved yesterday by adjusting with beam. As it turned out the beam yesterday afternoon had a very bad longitudinal emittance, so there were very long bunches and we got fooled by what we saw on the scope and probably picked up some halo source that was offset by that amount. The result is that we set the timing to collect on the wrong bucket and it explains the strange vertex distributions observed during the night. ------------------------------------------------------------
This archive was generated by hypermail 2b30 : Wed Jan 09 2002 - 16:38:59 EST