Lhc sector test
Download
1 / 42

LHC Sector Test - PowerPoint PPT Presentation


  • 94 Views
  • Uploaded on

LHC Sector Test. Mike Lamont. Outline. Overview Motivation Pre-requisites/preparation Tests with beam Organisation Conclusions. Overview…. 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:

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' LHC Sector Test' - christian-workman


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Lhc sector test

LHC Sector Test

Mike Lamont


Outline
Outline

  • Overview

  • Motivation

  • Pre-requisites/preparation

  • Tests with beam

  • Organisation

  • Conclusions

LHC sector test - MAC June 07


Overview
Overview…

  • 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

LHC sector test - MAC June 07


Injection
Injection

LHC sector test - MAC June 07


Triplets lhcb
Triplets & LHCb

Aiming for minimal losses in LHCb

LHC sector test - MAC June 07


Sector 7 8
Sector 7-8

X 23

LHC sector test - MAC June 07


Ir7 layout

D3 inverted

D3 OFF

Nominal orbit

IR7 layout

  • Intercept the beam with the three TCP’s and with the TCSG’s

  • Invert the polarity of D3

  • Switch OFF all the quadrupoles

Stefano Raedelli

Ralph Assmann

LHC sector test - MAC June 07


Intercepting the beam with the tcp s
Intercepting the beam with the TCP’s

LHC sector test - MAC June 07


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.

LHC sector test - MAC June 07



Integration
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

LHC sector test - MAC June 07


Integration commission with beam
Integration & commission with beam:

Full-blown system wide integration test

LHC sector test - MAC June 07


Beam the ultimate diagnostic
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

LHC sector test - MAC June 07


Milestone
Milestone

  • Machine Protection

  • Controls++

  • Magnets (model etc.)

  • Beam Instrumentation

  • BT: Kickers, Septa, TDI

  • Collimation

  • Radiation Protection

  • Access

  • Operations

  • Hardware Commissioning

LHC sector test - MAC June 07



IR8

Plus dipole correctors

LHC sector test - MAC June 07


Ds left ip8
DS left IP8

Plus dipole correctors

  • Item: Two lips, indifferent red

  • Item: Two grey eyes with lids to them

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

LHC sector test - MAC June 07


Arc 7 8
Arc 7-8

LHC sector test - MAC June 07


Ds lss right of 7
DS/LSS - right of 7

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

Q9: two MQTLs

Plus dipole correctors

LHC sector test - MAC June 07


Required circuits1
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

LHC sector test - MAC June 07


Other systems
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.

LHC sector test - MAC June 07


Access
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

Final Configuration

LHC sector test - MAC June 07


Radiation protection
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.

LHC sector test - MAC June 07



1 commission injection region

D2

Q5

BTVSS

1. Commission injection region

  • Steer into ring, onto TDI

  • Check instrumentation, septa, kickers, aperture…

Jan Uythoven

LHC sector test - MAC June 07


2 thread to ir7
2. Thread to IR7

  • Commission trajectory acquisition and correction

  • Thread beam

Jorg Wenninger

LHC sector test - MAC June 07


3 linear optics measurements
3. Linear optics measurements

  • Trajectory response using correctors and BPMs

    • BPM + corrector polarity and calibration errors

    • Phase, coupling

  • Dispersion measurement with dp and BPMs

  • Betatron matching measurement with BTVs

LHC sector test - MAC June 07


4 blm system tests
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

LHC sector test - MAC June 07


5 aperture measurement

MSI

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

5. Aperture measurement

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

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

Brennan Goddard

LHC sector test - MAC June 07


6 momentum aperture
6. Momentum Aperture

  • Transmission vs momentum offset by changing SPS RF frequency

  • Re-scale TI 8 to new momentum

dp/p = 0.004 (1mm en)

LHC sector test - MAC June 07


7 field quality checks

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

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))

Jorg Wenninger

LHC sector test - MAC June 07


8 effects of magnetic cycle
8. Effects of magnetic cycle trajectory change for 40

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

LHC sector test - MAC June 07


9. trajectory change for 40 Quench limits and BLM response

Quenches with beam motivation:

- safe and efficient operation

- avoid quenches and damage

  • Controlled, well defined tests to establish:

    • Absolute quench limits

    • BLM 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

LHC sector test - MAC June 07


Other possibilities
Other possibilities… trajectory change for 40

  • 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

LHC sector test - MAC June 07


Beam tests summary
Beam tests - summary trajectory change for 40

LHC sector test - MAC June 07


Near test schedule
Near test schedule trajectory change for 40

LHC sector test - MAC June 07


Schedule

12 trajectory change for 40

23

34

45

56

67

78

81

Consolidation

Operationtesting of availablesectors

Machine Checkout

BeamCommissioning to 7 TeV

Interconnection of the continuous cryostat

Global pressure test &Consolidation

Warm up

Leak tests of the last sub-sectors

Flushing

Powering Tests

Inner Triplets repairs & interconnections

Cool-down

Schedule

Mar.

Mar.

Apr.

Apr.

May

May

Jun.

Jun.

Jul.

Jul.

Aug.

Aug.

Sep.

Sep.

Oct.

Oct.

Nov.

Nov.

Dec.

Dec.

.

Jan.

Jan.

Feb.

Feb.

Mar.

Mar.

Apr.

Apr.

May

May

Jun.

Jun.

Jul.

Jul.

Aug.

Aug.

Sep.

Sep.

Oct.

Oct.

Nov.

Nov.

Dec.

Dec.

.

LHC sector test - MAC June 07


Impact 1 2
Impact 1/2 trajectory change for 40

  • 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

LHC sector test - MAC June 07


Impact 2 2
Impact 2/2 trajectory change for 40

  • 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

LHC sector test - MAC June 07


Details
Details trajectory change for 40

Chamonix 2006

Team in place which is examining implications, requirements and details of planned beam tests

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

LHC sector test - MAC June 07


Conclusions
Conclusions trajectory change for 40

  • 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.

LHC sector test - MAC June 07


Acknowledgements
Acknowledgements trajectory change for 40

  • 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.

LHC sector test - MAC June 07


ad