Planning for the week 11/30/2009 - PowerPoint Presentation

Slide1

Planning for the week

11/30/2009

1

MO

M

P

 

BCTFR, BPM setup (phases) with pilot intensity

B1/B2, pilot

MO

M

3

OK

IR8 - injection region aperture

B2 pilot

MO

M

2

OK

RF commissioning (loops, ...)

B2 pilot

MO

M

6

OK

Two beams in LHC, parts 1 2 and 3

B1/B2, pilot

MO

A

4

OK

Collimation setting-up & protection - 450 GeV

B1, pilot

MO

A

1

OK

Trial ramp

B1, pilot

MO

N

8

Started

Aperture measurements

B1

TU

MA

8

 

ACCESS (previewed 9-16) from 9-22

no beam

TU

N

8

Recover (mostly QPS issues) and

precycle

no beam

WE

MA

12

Recover (

cryo

problem 07 to 19) and

precycles

no beam

WE

A

4

Restart after 2 days off - beam for 3 hours - PS vacuum

B1/B2, pilot

TH

M

8

Access in shadow of PS recovery

no beam

TH

A

4

OK

setting-up beam 1, re-visit beam 2

B1/B2, pilot

TH

A

4

OK

OP/BI - energy matching/ capture/BPM PM

B1/B2, pilot

TH

N

8

First look at PLL then

cryo

problem 02-24

B1/B2, pilot

FR

M

8

Access

FR

A

8

Recover

FR

N

8

OK

Kick-response

SA

M

8

OK

Initial commissioning of beam dumping system, beam 1 and 2

B1/B2

SA

A

8

OK

Key beam parameters revisited - beam 1 & 2, beam size etc. measure & correct tune,

chromacity

, coupling both beams

B1/B2, pilot

SA

N

8

OK

ABP measurements

SU

M

8

OK

Protection devices and collimator setting-up - b2/b1

B1/B2, pilot

SU

A

4

MPS tests: FMCM, time delays

B1/B2, pilot

SU

A

4

Trial ramps

B1, pilot

SU

N

KICK RESPONSE

MO

M

8

Solenoids/coupling compensation

pilot, b1

MO

A

8

MPS: BLM thresholds - check plus thresholds and checks on beam dump BLMs

B1/B2 pilots

MO

N

8

 

Aperture measurements

pilot, B2

Slide2

Injection region studies point 8

RF on beam 22 beams in the machineCollimator set up

Test rampOvernightAperture measurements

11/30/2009

2

Plan for Monday

Slide3

Monday morning 7-10

Beam 2 to point 7 for injection region aperture measurements“Problem seems to be solved”

Morning 10-12RF work (phase loop closed), lifetime up to ~10h

BI work in parallelStatus both beams at midday MondayLots of successful BI system commissioning

RF capture and phase loop on

Orbit, Q, Q’, coupling measured and corrected to first order

Lifetimes ~10h

Dispersion remarkably good

Beta beating measuredKick response almost done for beam 1

Beam commissioning meeting Tuesday afternoon

11/30/2009

3

Monday

Slide4

Aperture point 8

11/30/2009

4

Slide5

From 12.00

Beam 1 injected. Lifetime of order 1 hour. Orbit corrected.

13.20 Inject again B1. Inject B2. Both in bucket 1. Both beams circulating in LHC. Hands off by OP for half an hour.

Adjustments based on BPMs through 1 and 5.Less easy in IR5 – could only move 1 beam – then lost 50% of 1 beam

Hands off by OP for half an hour

From 16.00

Beam 2 checks with beam dump at bucket 8911 and 26701

Then 2 beams in LHC at buckets 1 and 8911

Quiet beams for ALICEThen 2 beams in LHC at buckets 1 and 26701

Quiet beams for

LHCb

From 19.00Beam 2 back in bucket 12 beams in for collimation set up

Quickly steer IR5 (with new knob) and IR1Quiet beams for 15’ for CMS and ATLAS

11/30/2009

5

Monday

Slide6

2 beams in the machine

11/30/2009

6

Slide7

2 beams in the machine

11/30/2009

7

Slide8

2 beams in the machine

11/30/2009

8

Slide9

Steering position with BPMs – IR1

11/30/2009

9

Slide10

Steering position with BPMs – IR5

11/30/2009

10

Slide11

Steering position with BPMs – IR2

11/30/2009

11

Slide12

Steering position with BPMs – IR8

11/30/2009

12

Slide13

Steering position with BPMs – IR5 revisited

11/30/2009

13

Slide14

ALICE

11/30/2009

14

Slide15

ATLAS

11/30/2009

15

Slide16

CMS

11/30/2009

16

Slide17

LHCb

11/30/2009

17

Slide18

From 19.30 to 22.30 collimator set up

Dump

debunched beam

All losses on TCDS and TCDQFirst test ramp just after midnight

Beam 1

Beam to 540

GeV

Losses at start

Then stableThen losses (3

rd

order)

Then difficulties to re-establish conditionsFinally started aperture measurements around 04.00Stopped at 06.00, pre-cycle, S12 problems still …

Prepare for access

11/30/2009

18

Monday

Slide19

Tunes during the ramp

11/30/2009

19

Slide20

Orbit drift during ramp

11/30/2009

20

Slide21

First Multi-Stage Betatron and Momentum Cleaning after First Partial Collimation Setup

(20% of collimators set-up: 5.7

s

++, rest in coarse position, first energy ramp 24.11.2009)

IR7 betatron cleaning

(betatron halo losses)

IR3 momentum cleaning

(

uncaptured

beam)

IR6 dump protection



No unexpected losses in arcs, experimental insertions, …

Beam 1

f

actor 1000

e

ff

> 99%

Slide22

Pre-cycle machine

Access in LHC from 9 to 16 (became 22)Machine wide changes to nQPS on 600A

Plenty of other thingsRadiation survey in the injectors 14-18

Difficult recovery through the nightS12 cycle of Bends and Quads cycle failed around 22.00Various problems to restart elsewhere in the machine

Precycling

wherever possible

notably sector 12 (new QPS) for the first time

Cryo

problem S12 at 07.00 Wednesday. Access neededExchange PLCGood cryogenic conditions 19.00

Sorting out (last of) QPS issues through morning / afternoon

Ready for injection 22.00

Started with beam 2 very late WednesdayRevisiting Q, Q’PS vacuum leak around 02.00

11/30/2009

22

Tuesday/Wednesday

Slide23

PS vacuum leak around 02.00

More access in LHC, then cycling OKBeam available again 16.00Beam 2 injected around 17.00

Problems to circulate Beam 1With RF off

Losses at TCDQPut to parking position (which is nearer beam than it was)Losses now in IR3 as expected

Energy matching using beam 2

Frequency down 106Hz

SPS +250MeV

Transfer lines trimmed to match

Beam 1 circulating at 22.30RF

synchronisation

had changed (was no longer in bucket 1)

Some issues to be followed up with TCDQ position

11/30/2009

23

Thursday

Slide24

First turn after energy matching, beam 2

11/30/2009

24

Slide25

Orbits

11/30/2009

25

Slide26

Setting up B1 and B2 before KR campaign

BI team in parasitic modeFirst PLL beam transfer function (BTF) measurement of the LHC, before any phase correctionBeta-beating measurements on beam 1

H maximum 40%V maximum 30%Lost

cryo in S34 at 02.00PLC problem, similar to S12 earlier in the weekQuench heater firing in S12 while sitting at standby

To

be understood

11/30/2009

26

Overnight

Slide27

BTF

11/30/2009

27

Slide28

Recovering from

cryo PLC problem S34 (02.00)Limited access in the shadow for essential thingsTCDQ issue understood (IN<->OUT)

Cryo S34 back at 18.00Still problems to get all QPS OK

S45 access neededPre-cycling sectors when possibleFinally all (needed) circuits OK at 23.00Struggled with the injection interlock system

Beam in around 01.30

Overnight

Re-established conditions for beams 1 and 2

Kick response beam 2 (sectors 12 23 34 45 done)

Beam dumps due to beam loss when starting sector 56PS off from 04-07

11/30/2009

28

Friday

Slide29

Tunes Beam 1

11/30/2009

29

Slide30

Tunes Beam 2

11/30/2009

30

Slide31

Planning at 5 o’clock meeting Friday

11/30/2009

31

FR

M

8

 

Access

 

FR

A

8

 

Recover

 

FR

N

8

 

Kick-response

 

SA

M

8

 

Initial commissioning of beam dumping system, beam 1 and 2

B1/B2

SA

A

8

 

Key beam parameters revisited - beam 1 & 2, beam size etc. measure & correct tune, chromacity, coupling both beams

B1/B2, pilot

SA

N

8

 

Optics measurements (beta beating

meas

and correct)

 

SU

M

8

 

Protection devices and collimator setting-up - b2/b1

B1/B2, pilot

SU

A

4

 

MPS tests: FMCM, time delays

B1/B2

SU

A

4

 

Trial

ramps

B1, pilot

SU

N

 

 

Kick-response

 

MO

M

8

Solenoids/coupling compensation

pilot, b1

MO

A

8

MPS: BLM thresholds - check plus thresholds and checks on beam dump BLMs

B1/B2 pilots

MO

N

8

 

Aperture measurements

pilot, B2

TU

M

8

 

Two Beam Operation setting-up - 450 GeV - bumps

2x2, 5e9

TU

A

8

 

MPS: aperture in insertion regions, Calibration/check of triplet BLMs, experiment dump tests with BCM

pilot

TU

N

8

 

Aperture measurements

Solenoids & dipoles ON

WE

M

8

 

MPS: provoke magnet 'trip' and check adequate protection by collimators

pilot

WE

A

8

450 GeV collision setting-up - experiments

2x2, 2e10

WE

N

8

 

450 GeV collisions

2x2, 2e10

Slide32

Beam dump studies started around 08.00

Synchronisation checked with beam by scanning RF bucket through sweeps for B1 and B2:

beam 2 system looks spot on,

beam 1 kick is too late by about 1ms - need to adjust to exact value with access to UA when opportune - in the meantime should use RF bucket 500 to make sure beam is extracted (bucket 1 ends up on TCDS and will provoke interlock).

Saturday

Beam 1

Beam 2

Slide33

Protection devices and aperture scans

Aperture scanned for B1 extraction channel Apertures look similar to those obtained for B2 on Monday

Physical apertures seem OK on both planes

Verification of the protection in case of asynchronous dump

Saturday

Slide34

Orbit

Reference orbit B1 and B2 using common correctorsTune, coupling and chromaticity measurement and correctionC_ down to ~0.005 (

Beam 1)/0.0025 (

Beam 2) after correctionChromaticityMeasured values from +- 100, 50,0 trims off ref

Beam 1



Q’

H=+5 - Q’

V

=+7

Beam 2 

Q’H=+9 - Q’

H=+8Undulator

RU.L4 ON at 50 A:

no effect on orbit/tune (

Beam 2

)

 but not sufficient to see synch light  HW commissioning to be continued

Saturday

Slide35

Chromaticity measurement

35

Slide36

BI commissioning summary

phased in horizontal and vertical MKQA tune kicker for B1 and B2 measured and corrected PLL beam transfer function for B1 and B2 system (B2 requires some polarity/mapping checks)

tested continuous radial modulation via the orbit feedback controller and verified switch on/off procedures, frequency and amplitudes behaviour

performed initial PLL lock studies with B1, initial results look very promising, further assessment w.r.t. nominal PLL performance (bandwidth/sensitivity to resolve

dp

/p changes in the order of 1e-5) is needed

performed semi-automatic chromaticity measurements and preliminary tune modulation/de-modulation studies in view of continuous Q' tracking -> some FESA/SW issues have been identified that need to be addressed

Not yet ready for tune/chromaticity feedback

Saturday

Slide37

Tune kicker setting up

Slide38

PLL setting up

Chromaticity measurement

Slide39

PLL tracking

39

D

Q=0.01

Slide40

Chromaticity measurement

Q

V

’=15

Q

V

’=5

Slide41

Summary of beta-beating studies:

The beta-beating in beam2 was very different to the beta-beating measured before the ramp (most likely due to the lack of precycling then).

For Beam1 the initial beta beating agrees with the measured after the ramp (Friday 00:00 am), proving no changes in time with proper pre-cycling.

The first local error was found and successfully corrected in IP2 (MQXB2.R2 + 7e-5 and MQXB2.L2 -5e-5). A reduction of the peak vertical beta-beating in beam 1 of 10% was observed. No change was observed in the peak b-beat in beam 2 and the horizontal of beam1. We removed all the trims and re-measured the initial conditions without observing any change (no hysteresis effects).

Another study in IP7 was started but due to lack of time and frequent beam absence was not conclusive.

Saturday/Sunday

Slide42

Beta beat measurement

11/30/2009

42

Beam 1

Beam 2

H

H

V

V

60%

40%

40%

40%

Slide43

First attempt of beta-beating correction

Requires more time for injection tuning and chromaticity/coupling correction  go back to initial settings for the time being

Beta-beat correction

Slide44

Kick response corrector checks

Beam 1

Beam 2

Slide45

Summary collimation setup:

BEAM1:

=> All IR3, IR7 to nominal settings (primary aperture about 5.7 sigma) ==> multi-stage collimation is set up

==> Dump protection IR6 set up ==> TCT's in IR1 cross-checked: rough setting confirmed ==> Other TCT's not touched: at +-15 mm around +-15-25 sigma

BEAM2:

==> All IR3, IR7 to nominal settings (primary aperture about 5.7 sigma) ==>

mutli

-stage collimation is set up

==> Dump protection IR6 set up

==> TCT's not touched: at +-15 mm around +-15-25 sigma

Additional tests:

==> Check on interlock threshold for tungsten collimators (see logbook entry)

==> Movement and beam loss response check for vertical Roman Pots, beam1

11/30/2009

45

Sunday

Slide46

Finding the beam edge

11/30/2009

46

Slide47

Roman pots as well

11/30/2009

47

Slide48

MPS checks

FMCM reaction checks etcRamp testsSecond LHC ramp with beam 1 to 1.04 TeV

Tunes feed forward for next timeMachine did not come back (no pre-cycle)

Tunes off for beam 1Tunes trimmed (beam 1) and incorporated into rampThird ramp with both beams to 1.18

TeV

!!

Problem with patrol box in ATLAS 2-4

Injected again around 6

Beam 2 OKBeam 1 tunes wrong

11/30/2009

48

Sunday

Slide49

Ramp 2 orbits

11/30/2009

49

Slide50

Ramp 2 tunes

11/30/2009

50

Slide51

Ramp 3 tunes B1

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51

Slide52

Ramp 3 tunes B2

11/30/2009

52