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LHC progress report Week 7 2013

LHC progress report Week 7 2013. Coordination: Jan Uythoven , Mike Lamont Quench tests coordination: Mariusz Sapinski. Overview of the week. Monday Finished 1.38 TeV loss maps First 100b fill – VdM attempt abandoned Tuesday 500b 1347b fills 3557, 3558, 3559 Wednesday Fill 3560

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LHC progress report Week 7 2013

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  1. LHC progress reportWeek 7 2013 Coordination: Jan Uythoven, Mike Lamont Quench tests coordination: MariuszSapinski

  2. Overview of the week • Monday • Finished 1.38 TeV loss maps • First 100b fill – VdM attempt abandoned • Tuesday • 500b • 1347b fills 3557, 3558, 3559 • Wednesday • Fill 3560 • Evening: start VdM(s) • Thursday • Finish VdM, quick fill for ALFA & TOTEM, dumped at 07:24 • Switch to quench tests • Thursday morning – Saturday morning: quench tests • Saturday morning – Sunday morning: powering tests LHC status

  3. Precursor - change to pp run at 1.38 TeV • Last Sunday at 6:04: dump of last Pb-p fill • Configure machine for high intensity proton operation • Access for BPMS attenuators, ADT, ATLAS, CMS • Change RF and ADT settings, BLM thresholds back, BBQ, Head-tail monitor settings reverted • ALICE polarity to negative • Tests with beam • Cycles with probes, testing of interlocked BPMS, loss maps LHC status

  4. Laurette and Markusspecial 3556(500b) 3559 ALFATOTEM 3557 3558 3560 3555(100b) Van der Meer scans LHC status

  5. Same - luminosity LHC status

  6. Proton-proton at 1.38 TeV LHC status

  7. Roman pots – late request Mario Deile Only partially achieved • At the end of the upcoming 1400 bunch fill we briefly insert the pots to the validated position of 22 sigma, just as a necessary condition for proceeding further in the plan. I remind that last night's insertion to • 22 sigma from the 500 bunch fill was without any problem. • At the end of a low-intensity fill, possibly the VdM fill, we insert the pots to 13 sigma (where we would have physics acceptance) and do a quick loss map at dumping time. • If this loss map is ok, we insert to 13 sigma in the remaining fills. LHC status

  8. Beam size etc • Emittanceat injection were 1.1-1.2 um for the 50 ns beam • Emittance from luminosity: • 1.4 um with essentially nominal intensity (1.15e11 ppb) going into collision • NB less ramp, no squeeze LHC status

  9. End of Run 1 (2009 - 2013) LHC status

  10. BSRT heating test • We filled B2 in two major steps (690 bunches, waited ~30min, filled the rest up to 1338 bunches). Intensity per bunch ~1.5e11p. • With the machine full we increased few times the RF voltage to reduce the bunch length. • During the whole period we observed the temperature with probes in vacuum (installed during TS4). See the attached plot, from which: • The 3 couples of probes (close to the mirror, close to the ferrite tiles and close to the mirror arm vacuum bellow) clearly show that the ferrite is absorbing most of the RF power (as expected) and likely heating the rest. • We need to recalibrate the probes after dismantling the system in LS1… LHC status

  11. BSRT heating test LHC status

  12. BSRT heating test Even with the machine full for several minutes, the B2 mirror (glass bulk with dielectric coating, installed in TS4) didn't show any coating deformation --> image distortion, as observed in B1 (glass bulk + metallic coating) during 2012 high intensity fills and reproduced today in parallel to the B2 studies. The test was very useful to us, for understanding the system and take the appropriate actions during LS1. LHC status

  13. TIM As agreed we are currently doing the RP survey of the LHC with the TIM while the beam is on (survey started at 10h23 - now arrived in point 4 – 3km of survey in total). Up to now the train is fully operational and controllable from surface with stable vision feedback. On the RP side we had a maximum of 1mSv when exiting UL55 with an average of 0.3µSv along the machine. Bruno Feral LHC status

  14. Somewhat hampered on Friday by the change of power converter limits… Quench tests LHC status

  15. QT: 1MW on to collimators During collimation quench test with protons, 1 MW losses over several seconds were generated on collimators using ADT excitation. No magnet quenched in such conditions while signal on BLMs exceeded the assumed signal at quench by factor 3.5. LHC status

  16. QT: steady state with orbit bump 2. During steady-state loss with orbital bump a loss lasting about 20 seconds was generated directly on cold aperture. Quadrupole12L6 quenched in with BLM signals approximately at the expected level. Results of this exercise confirm what was achieved during the test in 2010 and are in disagreement with collimation test result, pointing probably to a large dependence of BLM signal from the loss scenario. LHC status

  17. QT: Fast losses 3. During fast loss quench test we have tried to address quench limit at UFO timescale. We have achieved longer loss (about 10 ms instead of ~1 ms) and quenched the magnet at the BLM signal level more than 5x higher than current estimation of quench limit. That is a very good news for UFO-related worries for LHC operation after LS1. LHC status

  18. 23:45 Friday evening QUENCH! With 8.2e8p (bunch 1092) and 200% ADT gain LHC status

  19. QT: Q6 4. During Q6 test the magnet was quenched with current corresponding to beam energy of ~4.5 TeV. Unfortunately we had no time to repeat this test with current corresponding to higher beam energy. LHC status

  20. Message from Mariusz & Daniel Valuch! • This success is thanks to your efforts, careful planning and preparations, which started with the first QSTW meeting on March 13th 2012. We had in total 6 meetings. • Slides and minutes can be found here: • https://indico.cern.ch/categoryDisplay.py?categId=1537 • I would like to thank you all. And thanks to OP for breakfast with champagne on Saturday morning! • The data which were collected are very important to assess LHC limits during 7 TeV run. The analyses will continue over next weeks and results will be discussed and presented, at MPP, LSWG and Collimation meetings. LHC status

  21. Special thanks… Many thanks to the collimation team (Stefano, Gianluca, Belen et al)for coming the last 4 weekends(pPb, PBp, polarity changes, pp)setting-up and verifying the loss maps And near permanent presence duringquench tests LHC status

  22. Saturday 16th February – early morning • 08:08 Quench • End Run 1 • Ramp-down LHC status

  23. Incoming LHC status

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