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ADTC meeting
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Europe/Zurich
93/R-031 (CERN)
AD/ELENA operation news
Lajos presented the status of AD and ELENA machines over the past weeks. The statistics are good and show stable pbars deliveries at very high levels, close to all times records. All users beam permits are signed. The 2 GeV7c optical notch has provided more stability overall, in particular for what concerns the impact of temperature variations. The research for dbars made progress when showing that it is possible to identify a very small number of circulation pbars (22...).
The Hminus source is being operated in parallel to pbars cycles, essentially for GBAR. A few maintenance operations have been required plus the weekly hydrogen refill. Also the BCCCA had to be refilled with lHe. A few issues were encountered in the past weeks leading to minor beam time losses. Vasco clarifies that one of the kicker issues was related to a faulty water temperature monitor.
The finemet cavities experiences regular modules trips, showing that a self protection method has to be implemented to avoid overloading remaining modules when 1 is tripped.
Next YETS planning
Francois presented the detailed planning for the next YETS. Beam will stop on 8th Dec and we expect to resume physics as of 13th March. Only minimal operations planned due to a short 2026 run before LS3 starts early September 26. Only routine maintenance will be performed on both machines (BI to confirm for instrumentation, in particular BTVs), at the exception of a vacuum leak fix on ELENA transfer line LNE03 (TELMAX gate valve).
Outlook to LS3
Francois showed the general lines of LS3 at AD/ELENA. The main activities in AD will concern the extraction / re-installation for refurbishment of 16 ring magnets (payment of the cost of transport to be confirmed by Antony), the replacement of the e-cooler and the complete refurbishment of the water cooling plant + HVAC systems for AD hall and machines. This activity will have severe impact as no demineralized water will be available throughout 2027 (putting this activity on the CP for restarting both machines) and no cooling /ventilation of the hall will be available for an extensive period of time (avoiding winter and summer though). The operations in the ring imply that all AD vacuum sectors will be brought to atmospheric pressure. Jose commented that the planning of bake -out has to be revised taking into account the similar operations in other machines.
The electron cooler swap is certainly the most challenging operation, time contingency has been anticipated. In ELENA, 9 ZQNAs will have to be repaired, necessitating to open 8 vacuum sectors. Davide suggests to re-check with BI the status of possible replacement of some SEM's by other types of profile monitors.
Some experiments have requested lHe and tap cooling water to be available. This latest point is to be arranged directly with CV, while the former has been addressed to SPSC who should give recommendations to CRG.
The PS beam availability is currently too late to allow a possible restart in June 2028. This point has been raised to LS3C.
AOB
A discussion is to be held soon in a Monday morning meeting to discuss the possibility to magnetically shield some sections of the ELENA transfer lines with mu metal, as it has been found beneficial by Masaki when doing it in ASACUSA zone.
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