Milestone of KEK Proton Synchrotron
summarized by H. Sato
| 1971 | Apr. | Construction Start |
| 1974 | June | 750 KeV Pre-Accelerator |
| Aug. | 20 MeV LINAC | |
| Dec. | Booster Accelerated up to 500 MeV | |
| 1975 | Dec. | MR Injection |
| 1976 | Mar. |
MR Accelerated up to 8 GeV (Original Design) |
| July | Utility Start Using Internal Target | |
| Dec. | MR 12 GeV | |
| 1977 | Jan. | Fast Extraction to EP1 Line |
| May | Utility Start for Bubble Chamber Experiment | |
| June | BSTR Intensity 6 x 1011 ppp | |
| Nov. | Slow Extraction to EP2 Line and Utility Start | |
| 1978 | July | MR Intensity 2 x1012 ppp |
| 1980 | Jan. | MR Intensity 2.85 x 1012 ppp |
| May | MR Intensity 4.07 x 1012 ppp | |
| June | Utility Start to Booster Facility | |
| 1981 | July | Shut Down of Fast Extraction |
| Dec. | MR Intensity 4.1 x 1012 ppp | |
| 1983 | Nov. | H- Injection to Booster |
| Polarized Proton Beam Acceleration Test Start | ||
| 1984 | Long Shut Down due to TRISTAN Construction | |
| May | Replace of Preaccelerator Tube | |
| 1985 | Nov. | LINAC Upgrade to 40 MeV |
| 1986 | May | Pulse Sharing Operation of Normal Intensity Beam and Polarized Proton Beam |
| 1987 | May | Utility Start Using Polarized Proton Beam |
| 1988 | May | Replace of Control System from Melcom to VME |
| 1989 | June | MR Intensity 5.4 x 1012 ppp (max.) |
| 1990 | May | BSTR Intensity 2.4 x 1012 ppp |
| Aug. | MR Power Supply Upgrade for the Flat Top Extension | |
| Sep. | Replace of EP1, EP2 Extraction system | |
| Realignment of the main ring Q magnets (vertical) | ||
| Oct. | EP2 Spill Length of 2 sec | |
| 1991 | Jan. | Slow Extraction to EP1 |
| May | Start of Deuteron Beam Acceleration Test | |
| 1992 | Jan. | Accelerated and Extracted of Deuteron Beam at 11.2GeV |
| Apr. | Utility Start Using Deuteron Beam | |
| Variable Energy Extraction | ||
| 1994 | Apr. | Septum-bump injection system was developed |
| Acceleration Test of aα-Beam and Utility Start at 23GeV | ||
| Aug. | Realignment of the booster magnets | |
| Nov. | MR Intensity 5.95 x 1012 ppp (max.) | |
| 1995 | Feb. | Study for the Intensity Upgrade |
| 1996 | Mar. | Polarized Duteron Beam Accelerator Test |
| Sep. | B-Q Duct and BPM Replacement (partially) | |
| Realignment of the main ring Q magnets (vertical, partially) | ||
| Oct. | MR Intensity 5.5-6.1 x 1012 ppp (20 min. AV) | |
| 1997 | Upgrade of the Pulsed Quarupole Power Supply for the Transition Crossing | |
| Studies for the Beam Loss at the Acceleration Start | ||
| Fast Kicker Magnets Design and Construction | ||
| 1998 | June | MR Intensity 4.7-4.9 x 1012 ppp during utility run |
| Half Year Shut Down for the Preparation of the Long Base Line Nuetrino Experiment | ||
| Installation of the Fact Kicker Magnets | ||
| Replace of the Septum Magnets Power Supply | ||
| 1999 | Feb. | Fast Extracted Beam to the Production Target Position |
| Mar. | Comissioning start of the Long Base Line Neutrino Experiment | |
| May | MR Intensity 6.2 x 1012 ppp | |
| June | MR Intensity 6.8 x 1012 ppp | |
| 2000 | Mar. | MR Intensity 8.0 x 1012 ppp |
| 2001 | Oct. | Booster Power Supply Upgrade |
| 2003 | July | Induction Acceleration Study |
| 2005 | Jan. | Fast Extraction End |
| 2005 | Dec. | Main Ring Utility End |
| 2006 | Mar. | Booster Utility End |