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Page 1: LHC Sector Test

LHC Sector Test

Mike Lamont

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Outline

Overview Motivation Pre-requisites/preparation Tests with beam Organisation Conclusions

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TI8 – injection L8 – LHCb - arc 7-8 – IR7 2 weeks with beam Close sectors 8-1, 7-8 and 6-7 Beam

Pilot Beam for the most part: single bunch of 5 - 10 x 109 protons

Total intensity: 3 x 1013 protons - comparable with one nominal

intensity LHC extraction from the SPS

TI8 – injection L8 – LHCb - arc 7-8 – IR7 2 weeks with beam Close sectors 8-1, 7-8 and 6-7 Beam

Pilot Beam for the most part: single bunch of 5 - 10 x 109 protons

Total intensity: 3 x 1013 protons - comparable with one nominal

intensity LHC extraction from the SPS

Overview…

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Injection

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Triplets & LHCb

Aiming for minimal losses in LHCb

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Sector 7-8

X 23

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IR7 layout1. Intercept the beam with the three TCP’s and with the TCSG’s 2. Invert the polarity of D33. Switch OFF all the quadrupoles

Nominal orbit

D3 OFF

D3 inverted

Stefano RaedelliRalph Assmann

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Intercepting the beam with the TCP’s

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IR7

Three TCPs closed “smartly”, D3 in opposite polarity, quadrupoles off All beam particles interact with >1m of C (typical=1.8m; max=3m) Additional protection from the next secondary collimators

EM showers are expected to be absorbed by MBW and MQW yokes (no issues for magnet). Detailed estimates should confirm that.

Minimum impact on the machine: - D3 polarity change (cable). - Lock collimators in position - Local activation - simulations to be performed.

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Motivation

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Integration Full test of a majority of subsystems over more than

one eighth of the ring

Allows staged approach to the full problem space

Time to fully resolve problems before the real thing Analysis, improvements, resolution, adjustment

The lessons learnt will reduce the time needed for full commissioning

Buys breathing space if there are any serious problems

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Integration & commission with beam:

Full-blown system wide integration testFull-blown system wide integration test

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Beam – the ultimate diagnostic

Polarity of magnetic elements Aperture in the cold machine Response of key beam instrumentation Magnet field quality

"What like a bullet can undeceive?" Herman Melville

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Milestone

Machine Protection Controls++ Magnets (model etc.) Beam Instrumentation BT: Kickers, Septa, TDI Collimation Radiation Protection Access Operations Hardware Commissioning

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Required circuits

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IR8RQ5.R8 Q5 quadrupole

RQ4.R8 Q4 quadrupole

RD2.R8 D2 recombination dipole

RD1.R8 D1 recombination dipole

RQX.R8 Inner triplet

RQX.L8 Inner triplet

RD1.L8 D1 recombination dipole

RD2.L8 D2 recombination dipole

RQ4.L8 Q4 quadrupole

RQ5.L8 Q5 quadrupole

RQ6.L8 MQM MQML

Plus dipole correctors

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DS left IP8

RQ7.L8 2*MQM

RQ8.L8 MQML

RQ9.L8 MQM MQMC

RQ10.L8 MQML

RQTL11.L8B2 MQTLI

RQT12.L8B2 MQT

RQT13.L8B2 MQT Plus dipole correctors

• Item: Two lips, indifferent red

• Item: Two grey eyes with lids to them

• Item: One neck, one chin, and so forth.

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CircuitsNumber of circuits

Priority

Main bends MB RB.A78 1 1

Main quads MQ RQF, RQD 2 1

Skew quads MQS RQS [B2] 1 1

Trim quads MQT RQTF,RQTD [B2] 2 1

Orbit correctors MCB RCB [B2] 23 H & 24 V 1

Lattice sextupoles MS RSF,RSD [B2] 4 2

Lattice octupoles MO ROD, ROF [B2] 1 3

Skew sextupoles MSS RSS [B2] 1 3

b3 spool MCS RCS [B2] 1 3

b4 spool MCO RCO [B2] 1 3

b5 spool MCD RCD [B2] 1 3

Arc 7-8

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DS/LSS - right of 7

RQT13.R7B2 QT

RQT12.R7B2 QT

RQTL11.R7B2 QTLI

RQTL10.R7B2 QTLI

RQTL9.R7B2 QTLI

RQTL8.R7B2 QTLI

RQTL7.R7B2 QTLI

RQ6.R7B2 6* QTLH

Q7,Q8,Q10,Q11: one MQTL alongside the MQ quadrupole

Q9: two MQTLs

Plus dipole correctors

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Required circuits

To get beam through sector 78, the main circuits listed above are required to be commissioned to 450 GeV.

For limited recycling, it would be preferable for listed circuits to be available to, say, the equivalent 1 TeV level.

• Beam 2 Circuits only

• Circuits commissioned to 450 GeV+ only

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Other systems Injection elements: septa, kickers Collimators Machine Protection Beam Instrumentation:

BPMs, BLMs, BTV, BCT, BST Magnet Model:

Transfer functions, harmonics Controls Software/tools Access system Radiation Protection Radiation Monitoring Optics, aperture model

Sector Test is another progressive milestone to be

used for testing key functionality

Work in progress but most of this is in good shape.

Effort in these areas is essentially orthogonal to HWC.

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Access Sector 6-7.

Interlocked gate right of IP 6 Point 7 (PM76)

Access system operational. Point 8 (PM85)

Access point fully operational. PZ85

Interlocked door in shielding wall Sector 1-8:

Interlocked gate left of IP 1

Sector 6-7. Interlocked gate right of IP 6

Point 7 (PM76) Access system operational.

Point 8 (PM85) Access point fully operational.

PZ85 Interlocked door in shielding wall

Sector 1-8: Interlocked gate left of IP 1

Final Configuration

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Radiation Protection All major installation will have finished and access to the

zones affected after the test will be limited. Dose maps for collimators in IR7 to be carefully evaluated. Given analysis, and measurements during and after the

test, it is envisaged that: Certain areas might be declared controlled areas for the first few

days after the test; Thereafter these areas would join the rest of the sectors involved

as supervised areas LHCb remains an undesignated area

Traceability restrictions come into force Need for additional RP instrumentation to be evaluated.

Work in progress. NB amount of beam is minimal.

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Beam

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1. Commission injection region

Steer into ring, onto TDI Check instrumentation, septa, kickers, aperture…

D2BTVSS

Q5

Jan Uythoven

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2. Thread to IR7

Commission trajectory acquisition and correction

Thread beam

Jorg Wenninger

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3. Linear optics measurements

Trajectory response using correctors and BPMs BPM + corrector polarity and calibration errors Phase, coupling

Dispersion measurement with p and BPMs Betatron matching measurement with BTVs

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4. BLM system tests

Get the system up and running, recording losses Prior calibration with source: expect reasonable numbers Acquisition & display of beam losses Some crosstalk studies possible (in principle ‘beam 1’ monitors

available…)

Bernd Dehning

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5. Aperture measurement

First iteration : oscillation from 2 correctors at 90º to probe ‘all’ phases

Second iteration if needed/time : bumps (local anomalies, specific regions)

-20

-15

-10

-5

0

5

10

15

20

1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 5500 5750 6000S [m]

Ns X aperture

TI 8 and sector 7-8 V-aperture and 8 s oscillationMSI

Brennan Goddard

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6. Momentum Aperture

Transmission vs momentum offset by changing SPS RF frequency

Re-scale TI 8 to new momentum

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 5500 5750 6000

S [m]

x [m

]

X

p/p = 0.004 (1mn)

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7. Field quality checks Kick-response and trajectory analysis LOCO – might be able to get a handle on average a2, b2

and b3 field errors of MBs, b2 of MQs Possibly extend method to check multipole corrector polarities (possibly via

strong excitation))

MB b3 field error effect (mean -9.6 units, rms 1.4 units). H trajectory change for 40 rad H kick (top) and 40 rad V kick (bottom) Jorg Wenninger

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8. Effects of magnetic cycle

Machine reproducibility and persistent current effects at injection for reduced pre-cycle

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Quenches with beam motivation:

- safe and efficient operation

- avoid quenches and damage

Controlled, well defined tests to establish:Controlled, well defined tests to establish:Absolute quench limitsBLM threshold values Model and understanding of correlation of loss pattern, quench level, BLM signals

Test important for efficient commissioning of BLM system with circulating beam

9. Quench limits and BLM response

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Other possibilities… 10. Energy offset versus time on flat bottom 11. Transfer line collimation studies 12. Injection projection studies 13. Separation and crossing angle bumps

Injecting onto vertical separation bump Bump closure, induced dispersion, aperture

14. Commission multi-bunch injection

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Priority Duration Intensity # shots Intensityh p+ p+

1End TI8, Injection Steering, commission BDI, timing

1 24 5E+09 500 2.5E+12

2Trajectory acquisition commissioning, trajectory correction, threading, energy

1 24 5E+09 500 2.5E+12

3Linear Optics from kick/trajectory, coupling, BPM polarity checks, corrector polarity checks

1 12 1E+10 400 4.0E+12

4 Check BLM system 1 6 5E+09 100 5.0E+11

5 Aperture limits, acceptance 1 18 5E+09 1000 5.0E+12

6 Momentum aperture 1 6 5E+09 100 5.0E+11

7 Field errors (high statistics) 2 12 2E+10 200 4.0E+12

8 Determination of quench level - calibrate BLMs 1 36 2E+11 20 4.0E+12

9Effects of magnetic cycle, variations during decay, reproducibility

1 24 5E+09 300 1.5E+12

10 Energy offset versus time on FB 2 12 3E+10 100 3.0E+12

11 Transfer line collimation studies - TCDI 2 6 5E+09 800 4.0E+12

12 Injection protection studies - TDI 2 6 5E+09 800 4.0E+12

13IR bumps, aperture, separation, crossing angle bumps

3 6 5E+09 100 5.0E+11

TOTAL 192 4920 2.6E+13 On to TCPDAYS 8 6.5E+12 On to TDI 

4.0E+12 On to TCDI

Beam tests - summary

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Near test schedule

Phase Time

Sector checkout, interlock & machine protection tests etc.

Tstart - 2 weeks

Close sectors 6-7, 7-8, 8-1 Tstart– 3 day

Access system tests & qualification Tstart – 2 day

Beam to end TI8 Tstart – 1 day

Tests with beam 2 weeks

Radiation survey Tend + 1 day

Establish supervised areas Tend + 2 day

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Schedule

.

.

Operation testing of available sectors

12 23 34 45 56 67 78 81

Machine Checkout

Beam Commissioning to 7 TeV

Consolidatio

n

Interconnection of the continuous cryostat

Leak tests of the last sub-sectors

Inner Triplets repairs & interconnections

Global pressure test &Consolidation

Flushing

Cool-down

Warm up

Powering Tests

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Impact 1/2

Given the state of installation, the sector test should have minimal impact on transport, interconnection work etc.

Deliberately chosen solution in IR7 which avoids additional interventions

Restricted access to sectors 8-1, 7-8, 6-7 during beam tests ~ 14 days

7-8 and injection region part of 8-1 become supervised areas after test (film badge etc.)

Work/Commissioning can clearly continue in other sectors during the test

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Impact 2/2

Sector test makes clear demands on: what is needed to be cold on what is needed to be hardware commissioned and to what level

Cryogenics, QPS, HWC support required during test

Could take time out of HWC program HWC would have to stop in 7-8 during test

Test preparation, other than cold mass, largely orthogonal to HWC

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DetailsSector test with beam

Overview, motivation and scheduling Mike Lamont

Proposed tests with beam Brennan Goddard

Magnet quenches with beam Alex Koschik

Beam Instrumentation Lars Jensen

Magnet requirements Luca Bottura

Controls requirements Robin Lauckner

Sector test preparation Chair: Pierre Strubin

Planning Esther Barbero Soto

Global Hardware Status Miguel Jimenez

Layout in LSS7 Jan Uythoven

Hardware Commissioning Roberto Saban

State of LHCb for the test Massimiliano Ferro-Luzzi

Radiation Issues Helmut Vincke

Access system Pierre Ninin

Team in place which is examining implications,

requirements and details of planned

beam tests

Chamonix 2006

http://cern.ch/lhc-injection-test/

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Conclusions

A sector test is surely a very useful exercise Undoubtedly speed full commissioning

It could prove to be a vital exercise If any major problems are uncovered

Requirements have clearly stated and are being addressed

Planned beam tests have been detailed

The potential impact would be minimal. Machine as is or as will be. Work carries on elsewhere. However, for the test to take place this year (if the schedule

allows) Hardware Commissioning would have to be tailored to provide necessary circuits to the necessary level.

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Acknowledgements Magnets Luca Bottura Beam Instrumentation Rhodri Jones, Lars Jensen, Stephen Jackson Injection Brennan Goddard, Jan Uythoven Radiation Protection Doris Forkel-Wirth, Helmut Vincke INB Ghislain Roy Access Pierre Ninin LHCb Rolf Linder HWC Roberto Saban & team Installation Katy Foraz Planning Esther Barbero Soto Vacuum Paul Cruikshank, Miguel Jimenez Controls Robin Lauckner ++ OP/AP Roger Bailey, Verena Kain, Massimo

Giovannozzi, Stephane Fartoukh, Helmut Burkhardt, Alex Koshick, Stefano Raedelli, Ralph Assmann, Frank Zimmerman… and the rest of the commissioning team.


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