dry run summary week 26: mkqa & ac dipole week 27: rf d. jacquet, m. gruwe, l. ponce, e....
TRANSCRIPT
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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Dry Run Summary
Week 26: MKQA & AC DipoleWeek 27: RF
D. Jacquet, M. Gruwe, L. Ponce, E. Veyrunes, xxx, V. Kain, R. Alemany
07.07.2009
https://espace.cern.ch/mddb/Systems%20Dry%20Run%20Tests/Home.aspx
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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Week 26: MKQA & AC dipoles
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B2 H B2 V
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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Week 27: RF Beam Control
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• 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
Þ 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 28.05.2009
W27
Cavity Controller
Cavity Controller
Cavity Controller
cav1B2cav4B2 cav2B2cav3B2
cav8B1cav5B1 cav7B1cav6B1cav5B2cav8B2 cav6B2cav7B2
cav4B1cav1B1 cav3B1cav2B1
IR4
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er line
High pow
er 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 QVoltage I
Coupler pos
Beam Control B1
Beam Control B2
400 MHz reference
RF SynchroFrevPre-PulsesClocks
SR4
UX451
tunnel
Power converter
High Voltage
FGC
FGC FGC
Phase PU Cavity Cavity
PHASE-LOOP Measurement
….. beam
Beam phase Cavity phase
BEAM CONTROLLOOPS MODULE-Phase loop-Radial loop-Synchro loop
(RF cavity/Beam phase)
SYNCHRO-LOOP Measurement
FrequencyProgram
VCXO(voltage control crystal oscillator)
(F/F prog)
Cavity controllersMaster RF (400Mhz ref)
RF RFGLoops gains/Tau/A
Radial steering
Coarse freq prog
Radial PU
RADIAL-LOOPPosition Measurement
BEAM CONTROLSimplified view(1 module per beam)
Radial pos
F
*parameters we can trim
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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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
07.07.2009
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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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.
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LHC Beam Commissioning Meeting V. Kain & R. Alemany
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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.
07.07.2009
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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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
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LHC Beam Commissioning Meeting V. Kain & R. Alemany
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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.
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LHC Beam Commissioning Meeting V. Kain & R. Alemany
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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
07.07.2009
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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RF Status
07.07.2009
April 2009Mond
ayTuesday
Wednesday
Thursday
Friday
Saturday
Sunday
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30
W17 DR
W14 DR
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
1CERN HOLID
2 3
4 5 6 7 8 9 10
11 12 13 14 15
16 17
18TT40/TT60
19 20 21CERN HOLID
22 23 24
25DSO
26 27 28 29DSO
30LASS TEST
31
May 2009
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
1CERN HOLID
2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30
June 2009Mond
ayTuesday
Wednesday
Thursday
Friday
Saturday
Sunday
29 30 1 2 3 4 5
6 7 8 9 10 11 12
3 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
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
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
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• Week 29• *) No RBAC strict next week -> postponed to 29th 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
LHC Beam Commissioning Meeting V. Kain & R. Alemany
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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
07.07.2009