LHC Morning Meeting - G. Arduini

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LHC Morning Meeting - G. Arduini Friday 17/08 09:00 Filling #2981. Still very good emittances 09:52 Beam dump during the ramp. SIS interlock on RB energy check. Data update too slow (CMW)  Being investigated While ramping down start PS access for RF cavity then access for ALICE, ATLAS, CMS + other 2 pending accesses for the machine. Problem of the 40 MHz RF cavity more serious than expected. Could not be repaired. More news next week. For the moment running without hot spare. 13:20 PS/SPS ready but still CMS access. 13:45 CMS out. 14:13 injecting (2983): 1.6x1011 p/b. Increased damper gain (V) during the squeeze. 15:41 Stable beams #2983: Initial luminosities close to 7x1033 cm-2s-1 . Losses on some bunches (B2 mostly) after end of squeeze. 11/11/2018 LHC Morning Meeting - G. Arduini

LHC Morning Meeting - G. Arduini Fill #2980 Instability (vertical) observed at the end of the squeeze in Fill 2980. BBQ-B1H BBQ-B2H BBQ-B1V BBQ-B2V 11/11/2018 LHC Morning Meeting - G. Arduini

LHC Morning Meeting - G. Arduini Fill #2980 Collision Collision End of squeeze End of squeeze X. Buffat Following recommendation from impedance team further increased damper gain in the V-plane (factor 2) now equal to H-plane 11/11/2018 LHC Morning Meeting - G. Arduini

LHC Morning Meeting - G. Arduini Fill 2983 Still some instabilities already appearing at the end of the squeeze and later although better than fill 2980. Further increase damper gain (now at maximum in both planes) and chromaticity (13 units) BBQ-B1H BBQ-B2H BBQ-B1V BBQ-B2V 11/11/2018 LHC Morning Meeting - G. Arduini

LHC Morning Meeting - G. Arduini Fill 2893 Damper pick-up data Consistency with BBQ data being verified B. Salvant 11/11/2018 LHC Morning Meeting - G. Arduini

LHC Morning Meeting - G. Arduini Fill 2893 Loss data Adjust End of squeeze X. Buffat 11/11/2018 LHC Morning Meeting - G. Arduini

LHC Morning Meeting - G. Arduini Kicker temperature Dump delayed due to injection kicker temperature (MKI2) to minimize waiting time at injection. Thresholds to be verified. 07:30 Beams dumped (end of fill #2893 – 195 pb-1 in 16 h). Filling for physics 11/11/2018 LHC Morning Meeting - G. Arduini