Beam Status Summary J Kameda KEK 05032004 Conveners

Beam Status Summary J. Kameda (KEK) 05/03/2004 Conveners Meeting 1. Proton on target (P. O. T) 2. 2. Beam direction from muon monitor 3. 3. GPS status

1. Delivered proton on target Accumulated POT Jun 1999 Feb. 15, 2004 ( Jan. 16 - Feb. 15) 5. 41 x 1018 POT 100. 98 x 1018 POT POT/spill = ~ 5. 4 x 1012 Protons

Summary of Protons on Target Delivered # of spills Delivered POT (x 1018) K 2 K - I ( ~ Jul. 01 ) 10700633 56. 060 47. 932 Jan. 03 - Apr 03 (1/17 - 4/24) 3270809 17. 295 15. 931 63. 863 May 03 -Jun 03 (5/14 – 6/23) 1381767 7. 144 6. 639 70. 502 Oct 03 -Nov 03 (10/3 – 11/17) 1471296 7. 514 6. 619 77. 121 Dec 03 (11/17 -12/23) 1331596 7. 067 　 6. 731 83. 852 Jan 04 (01/16 -02/01) 609256 2. 880 86. 732 3. 383 Good Spill POT(x 1018) Accumulated POT for physics analysis from Jun. 99 (x 1018)

2. Muon center (K 2 K – II, 2004 January ) Muon Center was Stable within 1 mrad.

3. KEK GPS status GPS system works stably and no big trouble. 1. We require time difference between GPS 1 and GPS 2 is less than 200 nsec 2. We also check the consistency between DAQ integrated and locally recorded GPS log. Bad GPS spill / All spills = 1559 /609256 Jan. 16 (run 8841) – Feb. 01 (run 8974) Mainly come from the 2 nd reason.

Summary • POT for physics analysis of Jan. 16 2004 --Feb. 1 = 2. 88 x 1018 by Dec. 23, 2003. • Good beam for Feb. data will be available in middle of March. • Accumulated POT is 86. 73 x 1018. • Muon center is stable within ± 1 mrad. • GPS in KEK is stable. Bad GPS spills is about 0. 002 % • Muon yield measured by Silicon Pad detector is under investigation.