From ROBERTS@buphyc.bu.eduSat Jun 29 09:50:58 1996 Date: Tue, 25 Jun 1996 16:08:07 -0400 (EDT) From: "Lee Roberts, Physics, Boston U. 617-353-2187, fax-9393" To: earle@buphy.bu.edu, CAREY@buphyc.bu.edu, krienen@bnldag.ags.bnl.gov, MAPES@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, brhughes@buphy.bu.edu, stratos@bnldag.ags.bnl.gov, zimm@bnl.gov, timmer@mnhep1.hep.umn.edu, prisca@mnhep1.hep.umn.edu, kindem@mnhep.hep.umn.edu, dmiller@mnhep.hep.umn.edu, giron@mnhep.hep.umn.edu, farley@bnlarm.bnl.gov, farley@purcell.obs-nice.fr, Kawall@bnldag.ags.bnl.gov, deng@bnldag.ags.bnl.gov, matthias@bnldag.ags.bnl.gov, redin@bnldag.ags.bnl.gov, winn@fair1.fairfield.edu, geller@bnlux1.bnl.gov, hseuh@bnlux1.bnl.gov, pai@bnldag.ags.bnl.gov, prigl@bnldag.ags.bnl.gov, tallerico@bnldag.ags.bnl.gov, SNYDSTRUP@bnldag.ags.bnl.gov, BROWN@bnldag.ags.bnl.gov, BUNCE@bnldag.ags.bnl.gov, JIA@bnldag.ags.bnl.gov, pearson@bnldag.ags.bnl.gov, CULLEN@bnldag.ags.bnl.gov, MENG@bnldag.ags.bnl.gov, pappas1@bnlux1.bnl.gov, POLK@bnlarm.bnl.gov, LARSEN@bnlarm.bnl.gov, MORSE@bnlarm.bnl.gov, WOODLE@bnldag.ags.bnl.gov, YYLEE@bnldag.ags.bnl.gov, STILLMAN@bnldag.ags.bnl.gov, pile@bnldag.ags.bnl.gov, mauro@gar.inst.bnl.gov, JACKSON@bnldag.ags.bnl.gov, YANNIS@bnlarm.bnl.gov, tk@hepth.cornell.edu, orlov@lns61.tn.cornell.edu, putlitz@physi.uni-heidelberg.de, Jungmann@physi.uni-heidelberg.de, hertzog@uinpla.npl.uiuc.edu, sedykh@uinpla.npl.uiuc.edu, deninger@uinpla.npl.uiuc.edu, urner@uinpla.npl.uiuc.edu, debevec@uinpla.npl.uiuc.edu, mizumach@kekvax.kek.jp, mizumach@ee.kagu.sut.ac.jp, satot@kekvax.kek.jp, endok@kekvax.kek.jp, akira@kekvax.kek.jp, KUROKAWA@kekvax.kek.jp, yim@bnldag.ags.bnl.gov, khazin@inp.nsk.su, solodov@inp.nsk.su, shatunov@inp.nsk.su, PEIXOTO@bnldag.ags.bnl.gov, hughes@yalph2.physics.yale.edu, dhawan@yalph2.physics.yale.edu, eps_sec@bnldag.ags.bnl.gov, scmag@lbl.gov, picasso@sns.it, roberts@bnlarm.bnl.gov, YIM@inp.nsk.su, grossmann@physi.uni-heidelberg.de, rind@mhpl3a.physics.lsa.umich.edu, mkotoole@physgi01f.phy.bnl.gov Subject: g-2 Ring News 25 June 1996 G. Bunce g-2 Ring News ------------- The rings have been cold--in the superconducting range--since Friday. However, we have not been able, so far, to reach 5 K, and to make liquid. We have had difficulty controling the expansion engine speed and have had to go to manual control. This has been difficult--obtaining sufficient speed, and not tripping on over-speed (which occured yesterday). We are continuing this effort today. If this is not successful, we may need to stop and check the heat loads, look for blockages, and repair the speed control. We have a bad bearing on the engine, and will need to replace it. This work would be done with the rings isolated, but would result in some warm-up. Our preference would be to get to temperature, do the testing at full field, then do these repairs. The inflector magnet ran successfully at KEK at 3000 amps (full field is 2850 amps), and is now at customs in New York. This is a major step for g-2 and Akira Yamamoto and Wuzheng Meng are to be congratulated! The beam tuning is complete, with the expected pion intensity per proton and beam envelope. Beam was used in the ring by the detector group to study the "flash" from the fast beam of pions. We also studied muon injection where the last section of the beam is tuned at 2% lower momentum. We would like to run at the highest single bunch intensity to test the new target, and to further test the detectors. We used 2-3 TP, single bunch, up to now. The AGS is working on this, and got to 5 TP last night. We would also like to run with multiple bunches to further test the target. We expect to do this final test Thursday night.