Shift summary for 04/18/00 On shift PR MO Guest KG Ecm = 3426 MeV (Chi0) Run Lumin.(nb-1) Beam curr.(mA) 5507 269.7 30.3 -> 27.4 5508 278.5 27.4 -> 11.7 Comments 11:15 HALF OF THE BEAM SUDDENLY LOST: during run 5508 beam current went suddenly down from 24.8 mA to 11.6 mA (h2_or rate from 1.4 MHz to 0.6 MHz). Pbar people called immediatly. Cause not already found. Straws tripped promptly to make us see the problem. 12.22 Run 5508 stopped. Stop procedures done. Typical istantaneous luminosity 3 10^31 cm^-2 s^-1 (2.1 10^31 cm^-2 s^-1 after beam lost). Logbook #7 pag. 80-81 Paolo and Margherita