Machine Status

Laurette reported on AD and ELENA machines operation news. The performance of both machines remains very good, even if some very minor degradation can be noticed, possibly linked to increasing temperatures. The most recurrent issue still concerns the main quadrupoles power supply, which requires resetting regularly, most of the time by the operators themselves.

ELENA e-cooler cathode and toroid power supplies also encountered some issues. This may require modifying the WIC logic, to be investigated further.

The leak of the TELMAX interface gate valve was fixed during MD, and the pressure is back to operational level. A more permanent fix will be proposed during LS3.

It appears that the loss of air conditioning in the large rack room is not monitored, leading to temperature run-away in the hall when it occurs. This could be potentially very severe for the electronics and will be reported to CV for action.

LS3 activities planning

Francois presented the list of the main activities planned during LS3 in AD/ELENA, with associated planning.

LS3 will start on 31^st Aug, with about 25 months of quite intense work for both AD / ELENA machines and infrastructure. The planning is dense but manageable. The protons are expected back from PS on target on 31st Sept 2028. This is the critical path for restarting the pbars beam. An earlier restart would allow a longer pbar run in 2028 (end date TBC).

The AD e-cooler swap will be the technically most challenging item.

The refurbishment of 12 (+6) main AD ring magnets will mark the AD—CONS project conclusion. This activity will have a major impact on transport workload.

The cooling station refurbishment is a major item, on the CP for ELENA machine restart.

Tap cooling water + lHe are requested by experiments throughout LS3, availability still TBC. Individual cooling of experiments is to be negotiated with CV.

The operation of ELENA with H- till end Nov at the request of GBAR is still TBC but not opposed by anyone so far.

Cable pulling campaigns during LS3

Samuel showed the status of the 2 main cable pulling campaigns, one concerning only the periphery of bdg 193, the other the inside of the AD hall. Additional requests have been received since the latest update of the slides, so a new iteration must be discussed with the contractor, with surely new dates to be proposed.

AOB

Bertrand explained that the parking lot will be heavily used during LS3, in particular for the large mobile crane plus skips for CV. A better location is requested for the gas bottles.

Bertrand also indicated that the inspection of the bdg 393 workshop showed some safety issues, linked to disorder of the place. All experiments are requested to clean and make sure that the machines are used only by qualified persons (no students…). The inspection report will be made available soon, and corresponding actions will be decided.

Richard noted that the WIC cables are missing from the new e-cooler DIC. Francois will contact Adriana.

Francois asked if some experiments encountered some voltage spikes on their 220 V network, as reported by Christian for STEP. This does not seem to be the case, while it was reported that some controllers have been found prone to fail il the past month, this being attributed to a bad series of components…

Didier indicated that more time will be needed for the access safety system ISTs, than indicated in the general planning. More details will be provided soon.