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ADTC meeting
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Europe/Zurich
530/R-030 - BE-EA Conference Room (CERN)
AD/ELENA operation news
Laurette presented the status of the AD and ELENA machines over the last 4 weeks. Very stable delivery of protons on target around 1.910^13 per bunch, yielding about 610^7 pbars extracted from AD to ELENA and 1.310^7 pbars delivered to experiments. Monitoring and diagnostics improvements allowed better proton beam size and trajectory in TT2, as well as measurement of bunch length extraction from PS.
The ELENA ion source has been delivering Hminus to GBAR with very good stability. The hydrogen cartridge is refilled every Wednesday during MD. Tests were performed in STEP and PUMA lines that had not been used so far this year.
AEgIS magnet has been off and will be switched on soon, not to 6T nominal field though, requiring an adaptation of the beam steering for ALPHA and ASACUSA. A discussion took place on the possibility to magnetically shield some sections of the ELENA transfer lines with mu metal, to reduce the impact of external b fields. Input expected from ABT.
Some issues were encountered with the stochastic cooling, linked to an internet card and a suspected faulty relay. Also a water leak on the pick-up cryo compressor had to be fixed, while a couple of amplifiers still need to be replaced.
EPC also encountered some issues on 24V power supplies for AD mains, with DHZ dipole in FTA line, and with e-cooler collector power supply (recurrent).
Issues with BI equipment concerned SEM grids in ASACUSA line and in the radial loop of AD, causing minor down time.
Electrical works in bdg 366 during YETS
Michael Lonjon presented the planned low voltage substation renewal in bdg 366. All elements in 366 building will be affected during the transfer on the temporary switchboard and onto the final system, in particular lights, power sockets, ventilation and EPC converters. The period concerned spans from 11th Dec till end of January. In principle, this should be transparent for AD systems, as power convertors will not be needed during this time.
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 27th February, which is 2 weeks earlier than what has been announced so far, due to a reduced time allocated to the beam commissioning of AD machine. This is in principle possible due to the fact that only basic/ routine maintenance is planned during YETS.
It is noted that an interface with the TELMAX experiments will be added after the interface gate valve on LNE03 transfer line.
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