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

07.07.2009

B2 H B2 V

LHC Beam Commissioning Meeting V. Kain & R. Alemany

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Week 27: RF Beam Control

07.07.2009

• 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

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High pow

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High pow

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High pow

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High pow

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High pow

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High pow

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High pow

er line

High pow

er line

High pow

er line

High pow

er line

High pow

er line

High pow

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High pow

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High pow

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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.

07.07.2009

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

07.07.2009

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.

07.07.2009

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