At 10H00 the Linac Sup was called again due to intensity fluctuations returning, she suspected LI.CBU02
and retuned onsite to investigate. The investigation continued, but at 14H00 the fluctuation
disappeared without explanation. Around 17H00 there were signs that the intensity stability problem
may come back to haunt us, but the operator and Linac supervisor were keeping an eye on the situation.
Monday 7/5/12
The LINAC supervisor & team was contacted first thing to investigate further the intensity fluctuations
that were still dogging the LINAC, as the users were heavily perturbed. Replacement of a tube on a
buncher by the LINAC RF team was hastily carried out, as they were concerned that this would die and
take the amplifier with it. After a 25 minute beam break, the beam was back and the fluctuations
seemed to have returned to their “normal” values. As the problems had come and gone, the equipment
was to be kept under surveillance for the next 24 hours.
Archives were proving difficult to reload and would fail due to a simple max/min error. The specialist
was called and the issue reported.
The MD_BEAM4PS_PSB cycle was worked on, as this cycle came back from archive with too large bunch
length (180ns in place of 160ns), and too small Eh (~3 in place of 13) and Ev(3 in place of 8). It was not
obvious why and work continues.
At 11H15 a micro glitch took down the C04 & C16 cavities in the PSB, and quick intervention by the
cavity specialist was required to convince us that they came back up OK.
Work had gone on all week setting up a 160MeV Flat cycle for R4 tests with the C02 & FINEMET cavities,
despite difficulties copying the required equipment parameters, by Monday afternoon the C02 was
setup in open loop with the Digital Beam Control, and we were ready to test with the FINEMET cavity.
Tuesday 8/5/12
LINAC intensity stability…
Beams:
FINEMET_FlatCycle: a 160 MeV flat cycle set up for R4 and used for FINEMET cavity tests in parallel with
the C02. (MD5)
MD_BEAM4PS_PSB: this cycle came back from archive with too large bunch length (180ns in place of
160ns), and too small Eh (~3 in place of 13) and Ev(3 in place of 8). It was not obvious why and work
continues.
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Komentarze do niniejszej Instrukcji