Dry Run Summary Week 26: MKQA & AC Dipole Week 27: RF D. Jacquet, M. Gruwe, L. Ponce, E. Veyrunes, xxx, V. Kain, R. Alemany LHC Beam Commissioning Meeting V. Kain & R. Alemany %20Run%20Tests/Home.aspx

Week 26: MKQA & AC dipoles LHC Beam Commissioning Meeting V. Kain & R. Alemany 2 B2 HB2 V

Week 27: RF Beam Control LHC Beam Commissioning Meeting V. Kain & R. Alemany 3 RF POWER – 4 RF modules composed of A power converter to generate the High voltage 4 HV lines – HV cables, klystron, circulators, RF load, wave guides and the high power couplers 4 superconducting cavities – powered independently by the high power lines. – In the same cryostat  Total of 8 cavities per beam RF LOW LEVEL – 1 Cavity controller per cavity (generate the voltage reference for the cavity) – 1 Beam control module per beam (generate the master RF) – 1 RF synchro module (ensure LHC/SPS synchronization, clocks and pre- pulses) Dry Run W27

Cavity Controller Cavity Controller Cavity Controller cav1B2cav4B2cav2B2cav3B2 cav8B1cav5B1cav7B1cav6B1 cav5B2cav8B2cav6B2cav7B2 cav4B1cav1B1cav3B1cav2B1 IR4 High power line Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Cavity Controller Voltage Q Voltage I Coupler pos Beam Control B1 Beam Control B2 400 MHz reference RF Synchro Frev Pre-Pulses Clocks SR4 UX451 tunnel Power converter High Voltage FGC

Phase PU Cavity PHASE-LOOP  Measurement ….. beam Beam phaseCavity phase BEAM CONTROL LOOPS MODULE -Phase loop -Radial loop -Synchro loop  (RF cavity/Beam phase) SYNCHRO-LOOP  Measurement Frequency Program VCXO (voltage control crystal oscillator)  (F/F prog) Cavity controllers Master RF (400Mhz ref) RF RFG Loops gains/Tau/A Radial steering Coarse freq prog Radial PU RADIAL-LOOP Position Measurement BEAM CONTROL Simplified view (1 module per beam) Radial pos FF *parameters we can trim

Week 27: RF Beam Control Status of all the loops will be added to power application (For the time being only visible through expert application). New FGC version not ready yet. Normal monitoring not working for the time being. Can use Delphine's application for FGC monitoring. Equipment Control -> RF LHC Beam Commissioning Meeting V. Kain & R. Alemany 6

Week 27: RF Beam Control Sequence tasks for making sure that everything is set for synchronisation with the LHC in the SPS and re-phasing on are not ready yet LHC Beam Commissioning Meeting V. Kain & R. Alemany 7

Week 27: RF Beam Control The RF front-ends: cfv-sr4-allsync1,...always appear red in Diamon even though everything is fine with them. Logging of errors of synchro, phase, radial is on_change right now; should be continuous logging. Otherwise logging of loops status and errors works!! VCXO control input logged. Frequency logged LHC Beam Commissioning Meeting V. Kain & R. Alemany 8

Week 27: RF Beam Control Sequence "prepare for filling": include checks whether everything was OK: – Warning OP Enable = True – Reset Synchro – Check Run Status for Synchro – Start Frev Master 1/2 – check Status s1Run = true – refresh Status – Disable all loops – Enable Synchro loop – Check whether synchro(radial) loop is locked -> This will have to be replaced eventually by task which checks every second whether the loops are locked for 10 seconds. – Wait 1s – Enable Phase loop – Reset Frev Master 1/2 – Check Status s1Run = true and s1FirstStart = true – Check property Status – wait 1s – start 40 MHz 1/2 + references – Check Status s1Run = true LHC Beam Commissioning Meeting V. Kain & R. Alemany 9

Week 27: RF Beam Control Also saw some problems with trim: "cancel last trim" did not work anymore. If started from LHC CCM could not log in. Loading settings (actual and functions) works for the current version of the FGC. We will retest with the new version in 2 weeks. Monitoring of the FGCs will only work properly then. Last sequence: "re-phasing for collisions" will not be testable before beam LHC Beam Commissioning Meeting V. Kain & R. Alemany 10

Week 27: RF Beam Control (Radial modulation + feedback) How to monitor what is coming through the real-time input? Need to have information whether real-time input is enabled. Needs to be shown somewhere: fixed display maybe... The read-command for FGCs whether real-time input enabled needs to be added to equipState (runFGC+: mode.RT...this has to be in mode.RT=sum not mode.RT = direct). Could not test radial modulation during dry run due to the problem with the RF beam control hardware. It will be repeated with the tests of the new version of the FGCs LHC Beam Commissioning Meeting V. Kain & R. Alemany 11

RF Status LHC Beam Commissioning Meeting V. Kain & R. Alemany 12

April 2009 Mond ay Tues day Wedn esday Thurs day Frida y Satur day Sunda y W17 DR W14 DR Mond ay Tues day Wedn esday Thurs day Frida y Satur day Sunda y 1 CERN HOLID TT40/T T CERN HOLID DSO DSO 30 LASS TEST 31 May 2009 Mond ay Tues day Wedn esday Thurs day Frida y Satur day Sunda y 1 CERN HOLID June 2009 Mond ay Tuesd ay Wedn esday Thurs day Frida y Satur day Sunda y July 2009 LHC Interleave Ext (SPS MD) TI8 Test TI2 Test RF (SM18) XPOC, BLM online chk, FBCT PT Starts W19 W20 W21 W22 W23 W24 W25 W26 W27 W28 W29 W30 W31 Coll Coll IST RF Beam Ctrl MKQA ACD Post Mort Nom Inj FeedBack TI8 DR TI2 DR MKI2 RF, VMCS, LBDS RBAC Strict LHC Interleave Ext (SPS MD) Mastership, pre- pulses for BT&BI, rephasing in SPS RBAC: OP mode & Piquet roles RF Power & LSA incorporation Next Dry Run Schedule *) Follow-up of all sorts of things: BCTs, BLM (new critical setting), fixed display clean-up *) new RF FGC version, real time radial modulation, update of RF power fixed display *) Virtual critical settings test *) LBDS beam 2

LHC Beam Commissioning Meeting V. Kain & R. Alemany 14 Week 29 *) No RBAC strict next week -> postponed to 29 th of July *) Postmortem dry run next week: M. Zerlauth will be in charge. Any requests directly to him. They will try for the first time automatic analysis after PM event; sort event building for beam based stuff. Week 30: *) Follow-up of all sorts of things: BCTs, BLM (new critical setting), fixed display clean-up *) new RF FGC version, real time radial modulation, update of RF power fixed display *) Virtual critical settings test *) LBDS beam 2 Week 31: *) Nominal injection sequence: pulse injection kickers,.... *) Injection sequencing: set BI, set RF, IQC *) Feedbacks Next Dry Run Schedule

Backup AC Dipoles (HB1, VB1, HB2, VB2): used on hadrons machine to measure the beam dynamics parameters in the linear and non- linear regimes. The advantages of AC dipoles against single fast kick are: 1.it forces long lasting betatron oscillations without emittance growth (  the AC dipole is ramped up and down adiabatically) 2.Thanks to this slow increase of the oscillation amplitude the machine protection should be easier to guarantee. 3.Increased signal to noise ration of the coherent forced oscillations versus the damped free oscillations due to filamentation. 4.Can provide a fast measurement of the machine aperture since one beam can be used several times for increasing oscillation amplitudes before the aperture is reached. Using single kicks requires a fresh beam for every different oscillation amplitude. 5.There is no beam filamentation LHC Beam Commissioning Meeting V. Kain & R. Alemany 15