stack 400 hours 34 s tacks l, OSO hours

2SO hours 66 bombar dments 1,050 hours 700 hours 800 hours 4 targe ts 1, 350 hours l SO hours 150 hours 150 hours 1. 8SO hour s EXPERIMENTS THAT ARE IN TEST STAGE (5): Meson Area

Neutral Eype ron 118 Diffrac tive vissociation ll86A Mu ltiparticle llllOA Neutron Elastic Scattering 11248 Neutrino Area (Cont'd) 30- Incli p - D @400 1!196 Tachyon Monopole 11202 30-Inch p - D @300 11209 30-Inch w- - D @?00&400 11218A Emulsion/ n- @200-300 fi2 64 Emulsion/Protons @200 11271 Quark 11 276 30- Inch p - D @200 11280 Super-·Heavy El ements 11 285 30- lnch 1r1 - D @200 1.1295 30- Inch p - p @lOO 11311 Neutrino 11 320 50 hours 400 hours Emulsion exposures to protons @400 GeV for experiments 238, 243, 245, 249, 251, 265, 279, 292 Meson Area (3) Polarized Scattering 1161

5:00 to 7: 30 p. m., Monday through Friday. Once a manager /bartender has been hired these hours will be extended. APPOINTMENTS... David Sauer joined the Laboratory staff as of July 1,. In charge of Site Services, he is working out of the Director's Office. Sauer came to from Indiana University, Bloomington, where he was Director of Const ruction Management for the State University system and a Registered Structural Engineer, Sauer holds the Master of Science Degree in Architectural Engineering from the University of Illinois. -24FACILITY UTILIZATION SUMMARY --JULYThe two -week period of 400-GeV operation, which start ed June 27, ended at 9 :35 a. m. on Wednesday, J uly 10, when a splice in one of the 13.8-kV feeders to the main ring failed. By the standards to which we have become accustomed at 300 GeV, the operating reliability and intens ity wer e ( poor. Beam for high energy physics r esearch was available for about 69 16 hours or 2 3% of the scheduled time, yielding 5. 8 x 10 protons for the experimental areas. Typical accelerat ed intensities were approximately 13 0.4 x 10 protons per pulse, limited by extraction losses. However, performance was improving noticeably in the last days. A wide range of probl ems

4 x 10 300-GeV protons were e xtracted to the experime nta l areas. A ccelerator r eliability continued somewhat below the recent average. The 251 hours of high energy physics time was 64% of that scheduled. Both the debuncher, which reduces the momentum spread of the beam into the booster, and the ORB UMP, which stacks multiple turns into the booster, were r eturned to service the last week of the month. The restorat ion of intensity to clo se 13 to the 10 level was underway at the m onth' s end. In the Meson Area, the interruption in operation during the 400 -GeV running period was used to repair leaks in the water-cooled aluminum insert to the C - 2 collimator. These repair s were succe ssfully completed, allowing the use of the closed-loop target cooling system. Thus, the long standing intensity limit ation of about 1.5 X 10 12 protons per pulse was removed. Many hour s of operation with - 5 X 10 12 protons per pulse were achieved with little indication of the previously noted r at e -dependence of the secondary flux. A 12 maximum intensity of

7.48 x 10 was delivered to the Meson Area on July 30. Seven experiments were active. Elastic Scattering # 7, Charge Exchange # 111, K 0 R egeneration # 82, and Neutron Dissociation # 305 continued dafa taking. Elastic Scatte ring # 69A completed its te s ting and setup, and began taking data. The t r ansition radiation detector development g roups, Experiments # 229 and # 261, remained downstream of Elastic Scattering # 7 in the Mi line. -26Lepton # 70 and Photoproduction # 87A took data in the Proton Area during the 400-GeV operating period. Lepton # 70 completed its program of ± measurement of e production at 90 ° in the center of mass at 400 GeV (83 mrad) with the low transverse momentum setting of their spectrometer. They were just preparing for some measurements at higher pt when the 13.8-kV feeder failed. Photoproduction # 87A ran for the first three days of the 300-GeV period

both 300 GeV and 400 GeV running was without the liquid deuterium neutron filter. The Proton Area was then turned off for construction work until July 26. Lepton # 70 reset its spectrometer position to a laboratory angle of 100 mrad, corr esponding to 90° in the center of mass at 200 GeV. When the P roton Area r eturned to ope ration, Lepton # 70 began check-out at the new angle

Photoproduction # 87A remained off to await the availability of the neutron filter. During the 400-GeV run, a few hundred neutrino pictures in the 15-foot