1. PS status 10 August – 17 August 2017
H. Damerau, F. Tecker on behalf of PS operations and supervisor team
User meeting – 17 August 2017
H. Damerau

2. PS 10th - 17th August
Busy week for PS Complex with about 88% availability
Main events only:
Planned stop on Thursday for PSB and PS
2h45 downtime for all beams, minor issues to recover
Pole face winding power converter (PR.WFW) issues on Thursday night
1h25 downtime for all beams
Unstable conditions from Linac2 since Saturday
Various stops for investigation, installation of observation (buncher 1)
Ok since Wednesday intervention: replaced directional and output couplers
~7h30 downtime for all beams in total

3. PS 10th - 17th August
Busy week for PS Complex with about 88% availability
PSB ring 1 RF unstable (phase of splitting)
2h interruption for MTE to SPS
Timing cable cut towards SPS (PEX.WSPS) on Tuesday
1h without beam to SPS
Inspection on module of fast extraction kicker (KFA71, module in SS79) today
1h30 stop for all beams, restarting

4. PS faults 10th - 17th August (AFT)
PS overview and cardiogram
Cable cut
Planned access, ~2h45
AD power converter
Linac2 unstable
Planned access, 2h45
Linac2 and PSB, ~12 h
Mainly degraded mode due to ring 2 cavity, 20.6 h (72.8%)

5. PS 10th - 17th August
Accumulated TOF intensity: 1.071019 pot (57% of 2017 target, ~10% above plan)
1.071019 pot

6. RF beam control upgrades
main accelerating ferrite-loaded cavities in PS
Compensate time of flight such that field sums up for beam  Dephasing
Fixed-target and EAST beams presently produced with analogue dephasing 2
Multi- phase shifter
10+1 cavity drives, h = 8
Corrections from loops
DDS* h=16 … 1
Multi- phase shifter
10+1 cavity drives, h = 16 …
*DDS: Direct Digital Synthesizer

7. RF beam control upgrades
Beams to AD and LHC: more flexible RF source system for dephasing
Single, fully programmable multi-harmonic RF source per cavity (MHS)
Upgraded during EYETS16/17
h, f, F
DDS h=256
MHS DDS
Corrections from loops
RF to cavity 11 any harmonic … …
RF to cavity 96 any harmonic
Migrating all user beams to MHS system, only longitudinal settings affected
Recently done for LHCPROBE and LHCINDIV  transparent

8. Example: TOF
Comparison of operational TOF beam with new clone using MHS
Transverse
Longitudinal
Operational TOF cycle
No measureable difference in beam parameters
Migrate operational beams
Accumulate experience
New MHS TOF cycle