14/08/01

PS Schedule meeting 13 August 2001

Beam availabilities week 31:-

Protons for AD 91.3 % AD beam availability = 73.8 %

ISOLDE (1.4GeV) 94.8 %

EASTC 94.5 %

EASTB 94.4 %

SFTPRO 90.4 %

LINAC2: Nothing to report

PSB: No major problem to report. However, there is a problem with level 3 of the distributor (injection) and the PO group is working to try to find a solution.

ISOLDE: The ISOLDE target broke down prematurely on Monday morning and had to be changed. This shifted the ISODLE schedule with 2 days (needed to change target and re-tune the separator). The users have confirmed the existence of the important isotope 130Cd.

PS:

-Tuesday: Module 8 on KFA71 tripped due to a leak of SF6, and the transfo 203, which was too optimistic, has been recalibrated.

-Wednesday: The EAST beam have been stopped, for a foreseen access (to install a mono-rail for T7 irradiation).

-Thursday: Important losses on the SFTPRO beam were observed on the BLMs. It was due to a problem with the power supply for the electrostatic septum SEH31. It has been solved after an access in the PS machine. A water leak in section 16 (in the ventilation room, in front of septum 16) has also been stopped.

-The 2 sources, which could be responsible for the lack of pbars observed by the AD people for few days, have been studied : transverse emittances and steering in the TT2 and 9000 lines. Both seemed to be OK. The other suspected source is the bunch rotation, which will be investigated by the AD people. An error in the transverse emittances or the steering was suspected as there was a loss of ~250e10 protons between the transfos FTA.TFA9012 and 9053 (for ~1500e10 ejected protons). The calibration of these transfos is suspected as in the Equipment Survey, it can be seen that the transmission decreased from ~100% to ~85% on 02/08/01, and the same day the BD people worked on them (changes of attenuators...).

-As concerns MDs, the MESPS cycle has been used on Wednesday for optics measurements in the TT2-TT10 transfer line. On Thursday and Friday, the cycle TSTPS (which is a copy of MESPS) has been used for high-energy coupling measurements.

AD: The AD Monday MD was dedicated to the alignment of the electron beam with the pbar beam at 300 MeV/c. This was successful and the work will continue this Monday on the 100 MeV/C flat top. Once completed for both energies this can be put into operation.

SPS: No major problem to report. The single bunch MD measurements are presently dedicate to impedance measurements. Emittance measurements in the TT2-TT10 line will be performed this week.

EAST HALL: The irradiations are progressing well in all lines. The earlier reported problem of a strong background peak just after the main spill has been resolved. It was due to an too early down ramping of a magnet in the PS. The HARP experiment is now fully operational and on-line and has started taking data.