1. LHC beams in the SPS in 2014 H. Bartosik, G. Rumolo, G. Iadarola With the help from K. Kornelis, V. Kain and SPS OP crew

2. LHC beams during the startup Started the machine setup with LHC filling cycle 12 bunches Acceleration needed for combined orbit correction (SFTPRO + LHC cycles) at top energy  quadrupole alignment campaign (2 iterations) Correction may be beneficial for closed orbit stability during LHC extraction … before alignment: h rms /v rms = 10.9/4.7 mm after alignment: h rms /v rms = 2.3/1.6 mm

3. LHC beams in parallel to physics LHC beam on flat bottom cycle (3.2 s store) for vacuum conditioning of MKP4 −During LS1 the MKP4 module was exchanged with a new one (E. Carlier) + intervention due to problem on water manifold in August −High static pressure level (~1e-7 mbar) since the beginning, not significantly improving MKPA MKPB MKPC MKP4 SW interlock HW interlock

4. LHC beams in parallel to physics LHC beam on flat bottom cycle (3.2 s store) for vacuum conditioning of MKP4 −During LS1 the MKP4 module was exchanged with a new one (E. Carlier) + intervention due to problem on water manifold in August −High static pressure level (~1e-7 mbar) since the beginning, not significantly improving −Dynamic pressure rise with LHC beams  already some conditioning for 72 bunches for 3.2s (in parallel to SFTPRO)

5. LHC beams in parallel to physics LHC beam on flat bottom cycle (3.2 s store) for vacuum conditioning of MKP4 −During LS1 the MKP4 module was exchanged with a new one (E. Carlier) + intervention due to problem on water manifold in August −High static pressure level (~1e-7 mbar) since the beginning, not significantly improving −Dynamic pressure rise with LHC beams  already some conditioning for 72 bunches for 3.2s (in parallel to SFTPRO) −Software interlock at 2e-7 mbar  can we increase it? (TE-ABT is investigating) −Hardware interlock at 1e-6 mbar … could be serious limitation for scrubbing

6. LHC beams in parallel to physics LHC beam on flat bottom cycle (3.2 s store) for vacuum conditioning of MKP4 −During LS1 the MKP4 module was exchanged with a new one (E. Carlier) + intervention due to problem on water manifold in August −High static pressure level (~1e-7 mbar) since the beginning, not significantly improving −Dynamic pressure rise with LHC beams  already some conditioning for 72 bunches for 3.2s (in parallel to SFTPRO) −Software interlock at 2e-7 mbar  can we increase it? (TE-ABT is investigating) −Hardware interlock at 1e-6 mbar … could be serious limitation for scrubbing ZS −Accidentally vented during LS1 −Intervention next to ZS to repair vacuum leak on bellow for Miniscan, no limitation so far −Sparking no limitation so far, new spark monitor available

7. LHC beams in parallel to physics LHC beam on flat bottom cycle (3.2 s store) for vacuum conditioning of MKP4 −During LS1 the MKP4 module was exchanged with a new one (E. Carlier) + intervention due to problem on water manifold in August −High static pressure level (~1e-7 mbar) since the beginning, not significantly improving −Dynamic pressure rise with LHC beams  already some conditioning for 72 bunches for 3.2s (in parallel to SFTPRO) −Software interlock at 2e-7 mbar  can we increase it? (TE-ABT is investigating) −Hardware interlock at 1e-6 mbar … could be serious limitation for scrubbing ZS −Accidentally vented during LS1 −Intervention next to ZS to repair vacuum leak on bellow for Miniscan, no limitation so far −Sparking no limitation so far, new spark monitor available New TIDVG −No limitation so far (e.g. outgassing), since only 5% of 1e13 p SFTPRO beam dumped regularly −New software interlock for dumped intensity in place (V. Kain)

8. Impressions so far Conditioning of sensitive elements up to now we were not limited at all by e-cloud in the arcs would not have been better with coated magnets!! Beam instrumentation Some key instruments were not calibrated/working at the beginning Debugging required some time and iterations Setup of transverse damper and longitudinal feedback Requires also beam time … LHC beam available from PS Up to now not in stable (i.e. constant) conditions  extraction conditions incl. extraction bumps changed many times in the last weeks Had lower priority than other CPS physics users … Scrubbing run right after startup probably not efficient?

9. Present status Beam from the PS low energy part needs optimization (some instability) 72 bunches up to 1.3e11 p/b Transverse emittance below 4 um (measured with TT2 fils, S. Gilardoni) Extraction bump set to include dummy septum LHC beam on SPS short flat bottom cycle during nights 72 bunches up to 1.3e11 p/b with good life time (>98% transmission for 3.2s)

10. Beam instrumentation Wire scanner Bunch-by-bunch was working, presently software problem on frontend (followed up by BI) BWS 519 presently not working Standard equipment BCT  Checked (incl. SDDS logging) FBCT  Checked BPMs BBQ Mountain range (incl. SDDS logging) Vacuum gauges Will be logged during scrubbing run (M. Taborelli taking care, meeting on Thursday) Ecloud monitors Headtail monitor Can be used, but only through FESA navigator  manual saving  (V. Kain is working on application) Transverse high bandwidth pick-up Operational, application is being finalized (incl. SDDS logging) BGI Not operational, but could be could moment to work on that … (BI is aware) LHC BPMs  not working

11. Schedule Monday (3.11.) Inject 25 ns beam on scrubbing cycles (18 bp, 33 bp) and perform basic checks Take reference measurements of emittance and beam lifetime with 25 ns beam (as many batches as allowed by MKP and vacuum) Check with B. Bahlan that ZS sparking interlocking works Move COLDEX in Start scrubbing run on 18bp flat bottom cycle Setup acceleration of 72 bunches (transverse damper + longitudinal feedback) in parallel MondayTuesdayWednesdayThursdayFriday SaturdaySunday Week 45

12. Schedule Tuesday – Sunday (4-9.11.) Scrubbing with increasing number of batches and increasing store time on flat bottom E-cloud measurements on dedicated equipment Beam qualification in parallel, also on acceleration cycle (emittances along train, lifetime, …) a-C coated half cells COLDEX measurements in parallel −Goal is to study COLDEX with different beam intensities and types −Measurements at 2 different beam screen temperatures −Measurements during acceleration Wednesday (5.11.) 8h MD on 800 MHz LL-RF (on acceleration cycle) Monday (10.11.) Move COLDEX out Return to physics MondayTuesdayWednesdayThursdayFriday SaturdaySunday Week 45

13. Operational procedures Accelerator mode to No Extraction All extraction elements off Leave extraction channel in (we want to condition it in operational position) ZS voltage to -30 kV Septa off (including cooling circuits) Power converters in NA off Block fast interlock valves Make sure Septa cooling circuits off! Interlock on integrated beam dump intensity to be masked if using only flat bottom cycle Need to monitor carefully Kicker temperatures (in particular MKP) Septa temperature Vacuum level of MKP1 (next to TIDVG)

14. Summary Up to now 72 bunches with up to 1.3e11 p/b, good transmission on flat bottom Transverse feedback is setup on flat bottom Played LHC beam on short flat bottom cycle in parallel to physics for vacuum conditioning MKP4 is main limitation so far New module installed during LS1 + problem on water manifold in August High static pressure level ~1e-7 mbar and no significant conditioning Dynamic pressure with LHC beam improving slowly Open question about increasing SW interlock (presently at 2e-7 mbar) Preparation for scrubbing run Additional time between startup and scrubbing was very useful for beam setup Most of the beam instrumentation ready, remaining issues are followed up

15. Thank you for your attention!