The beam lifetime is improving, it is now about 7 hours at 120 mA and 10 hours at 70 mA. The main reason for the improving lifetime is reduced outgassing from the cavity.
One reason why we do not get more current is an unstable microtron. The RF level feeding the
linac is varying too much. We have checked most of the RF system, and now we think the
problem may be dirt in the waveguide. This will be taken apart and cleaned tomorrow. We will
still make an injection tomorrow morning, and hope to have the microtron ready again late
afternoon.
The Undulator: The Miyake monochromator has been baked, and the vacuum has improved by a factor of 5 to 10. The pre-mirror chamber is OK, and as soon as the connecting beamline is ready FF et al. will start using the beamline. This should happen in a day or two.
John West from Daresbury will visit the undulator group from August 27 to 29.
Finn Abildskov has left ISA, and is now 100% IFA, but an agreement has been made, such that
FA will assist ISA in the transition period. Tonny Korsbjerg will from now on also be responsible for pick-ups and amplifiers, while the rest of FA's diagnostics responsibilities will be taken
over by Johnny Hansen.
Changes for the next ion run, which is scheduled to start in week 45/97, should be planned
now. One major change will be to replace the ion RF cavity with a drift tube. It is a relatively
simple construction, and will be ready for the coming ion run.
The injection beamline for the separator when it is moved to the new room, is being prepared.
The move will take place during Electron run 1/98, which will start late January 1998.
The EBIS will be equipped with a small ion injector, and Toft is preparing the installation. There
will be a lot of work aligning things, and learning to transport beams in and out of the EBIS.
Air conditioning in the old hall would have been very nice to have this summer, since the high
temperatures (up to 35 deg) is harmful to electronics besides being unpleasant for the people who
have to work there. We will discuss how this can be made. Possibly, we can use some of the
excess cooling capacity in the new hall.
KTN will stay with us for two more months, since his contract with CERN has been postponed.
He will leave at the end of October.
19/8 1997 NH + SPM