From ROBERTS@bnlarm.bnl.govMon May 6 11:50:03 1996 Date: Mon, 6 May 1996 10:30:07 -0400 (EDT) From: "B. LEE ROBERTS, BOSTON UNIV.(E821 G-2) PHONE 516-344-2287" To: earle@buphy.bu.edu, CAREY@buphyc.bu.edu, krienen@bnldag.ags.bnl.gov, miller@buphyc.bu.edu, roberts@buphyc.bu.edu, sulak@buphyc.bu.edu, worstell@buphyc.bu.edu, hazen@budoe.bu.edu, brown@buphyc.bu.edu Subject: Beamline Progress Beamline News - 3 May 1996 - G. Bunce and L. Roberts On May 2 at 16:00 the slow beam program was interupted for U/V line commissioning. The first few hours were taken up with changes to chipmunks, etc. and locking up the appropriate tunnels, including a door of Bld. 919, in order to secure the secondary and primary beamlines. This was done with chains and locks since the "PASS" system was not completely operational. By midnight there was beam in the AGS, and the extraction bumps were set up with 8 bunches in the machine. A synchronization problem was encountered when the attempt was made to go to one bunch in the machine, and an rf expert was called in to fix this problem. Linac and RFQ problems also occurred, but when all the equipment worked, and the kicker was fired, beam appeared at the target flag at 07:10 on May 3. The set up for the slow beam program began at 08:00. Many people were involed in this test. In addition to Hugh Brown (who designed the beamlines), GB and LR, during the night there were between 8 to 12 other people in the control room at any time during the overnight shift. Since the extraction line is run on the RHIC controls system, we had two people from RHIC helping, plus kicker experts, controls experts, operations experts plus the usual staff for the AGS main control. We need one additional stretch of dedicated time to establish a well tuned proton beam and to carry out fault studies. After the fault studies are finished, we will be allowed to get isolated pulses on demand to continue our beamline commissioning. These studies with "pulse on demand" extraction will have a minimal effect on the slow beam program. On Tuesday we hope to carry out the fault studies and to be able to move into this new regime of beam available on demand into our hall. In this mode, we could get several hundred pulses per 8 hour shift if we can use them.