Transcript Slide 1

ILC roles
Interferometry
Results
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
1
2009 / 2010
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
ILC roles
Interferometry
MONALISA
M.S. Warden, P. A. Coe, D. Urner and A. Reichold
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
2
2009 / 2010
Results
• ILC roles and requirements
• Interferometer measurements
• Recent results
• Highlights 2009/10
ILC roles
Roles at ILC
Interferometry
• Monitor most position sensitive magnets
– Final focus quadrupoles
– Energy chicane magnets
– Beam delivery system
– Cross check beam-based measurements
– Provides measurement when beams absent
– Help relocation after push-pull
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
3
2009 / 2010
Results
• Provide independent monitor of position
ILC roles
(Random example)
ILD Letter of Intent
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
4
2009 / 2010
Results
Interferometry
• QD0 alignment
ILC detectors
ILC roles
• All 3 concepts call for interferometer system
Interferometry
– letters of intent mention the idea
– 19 Apr push pull ACFA and GDE/BDS session
• Later detailed engineering
– where and how to arrange lines of sight
– trade off between different options
– other outstanding issues would include:
• monitoring cold mass non-trivial
• opening / closing lines of sight not yet mentioned in
push-pull plans – probably too early to discuss now
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
5
2009 / 2010
Results
• studies at ATF-2 and CLIC will inform this process
CMS
Interferometry
ILC roles
LHC lessons
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
Put lines of sight
into the design as
early as possible
6
2009 / 2010
• Routing fibre –coupled
interferometers requires more
space than you might think
Results
ATLAS FSI
Interferometry
ILC roles
Narrow lines favoured through
detector
Platform attached
To Detector
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
7
2009 / 2010
Results
5cm vacuum tubes
ILC roles
Interferometer: Distance meter
• Operates in two modes
Results
Displacement
• Two modes combined
– Displacements referred to absolute distance
– Tolerant to interruption of measurements
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
8
2009 / 2010
Absolute distance
Interferometry
– Absolute Distance (< mm resolution)
– Displacement measurement (nm resolution)
1. Simulated fringe pattern – read out with parallel fibre array
2. Converted to interferometer phase reading
3. Measurements all based on phase values
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
9
2009 / 2010
Results
Interferometry
ILC roles
Interferometer: Distance meter
ILC roles
Interferometer head
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
10
2009 / 2010
Results
Interferometry
• Prototype tested at Oxford
ILC roles
Interferometers: Make relative measurements
• Distance Meters measure point to point
Interferometry
– Range and displacements (e changes)
• 2 lasers reduce systematic errors of range
• Compact Straightness monitor
– Combines distance meters to measure object to
object
• 3 translational degrees of freedom
• 3 rotational degrees of freedom
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
11
2009 / 2010
Results
– We use FSI laser and the FFI laser
•
•
ILC roles
Instruments: CSM
Compact Straightness Monitor
Example from ATF2
Results
Internal displacements and rotations measured
CSM always blind to 6 external DoF
100 m m
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
12
2009 / 2010
•
•
Interferometry
– Measures plane to plane
ILC roles
Recent tests
Interferometry
• Verified laser frequency
stability
– EUROTeV-Report-2008-031
(EPAC08 Paper: TUPC121)
– see next slide
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
13
2009 / 2010
Results
• Demonstrated FFI and FSI
agreement inside vacuum
vessel
Interferometry
Calculated overall change: 62mm
Results
•
Good agreement
between FSI and
FFI
Strong correlation
between pressure
and measured
OPD
-0.2
0
0.2
Displacement (microns)
vac
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
atm
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
14
2009 / 2010
•
ILC roles
Changing pressure
ILC roles
Highlights 2009 / 2010
• Installation at ATF-2
Interferometry
– July 09 install, test vacuum vessel at ATF2
– Autumn install, test optics at ATF2
– Commissioned system by Jan/Feb 2010
• Test magnet at CLIC
• Laser stabilisation system at Oxford
– to provide Rb frequency reference
– commissioning in 2009
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
15
2009 / 2010
Results
– Simple initial interferometers mid 2010
– Upgrade to CSM tests 2011
Double bellow system
Interferometry
– encloses vacuum in
centre
– high pressure outer
Results
QD0
CSM interferometers
– lines of sight along centre
– reflectors on Shintake
– launch heads on QD0
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
16
2009 / 2010
Shintake table
ILC roles
ATF-2 installation 2009
Magnet
Interferometry
• Test several points along
the magnet
ILC roles
Monitoring CLIC magnet 2010
– at first independent DMs
– on the magnet
– and on the floor
Floor
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
17
2009 / 2010
Results
• Compare readings with
accelerometers
ILC roles
Summary
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
18
2009 / 2010
Valuable information from this programme
feeds directly into ILC and CLIC
requirements for interferometric monitoring
Results
Interferometry
• Installation at ATF-2 2009 / 2010
• Installation at CLIC test magnet 2010/11
• System testing / development ongoing at
Oxford
ILC roles
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
19
2009 / 2010
Results
Interferometry
Thank you for listening
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
ILC roles
20
2009 / 2010
Results
Interferometry
Back up slides – beyond this point
ILC roles
Ideal Case: Direct View of QD0
2d laser grid
Interferometry
QD0
Results
QD0
Enclosure
Yoke
Needs retraction
mechanism
Only small connection
force required to
kick-start vacuum.
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
21
2009 / 2010
QD0
2d laser grid
In vacuum
Yoke
Interferometry
QD0
Results
QD0
Enclosure
In air: unclear
how accurate
this can be.
Produces fairly
difficult to understand
region.
Mon 20 Apr 2009
10:00 JST (01:00 UTC)
MDI 2 @ TILC09 – Tsukuba
OXFORD MONALISA
22
2009 / 2010
4cm
ILC roles
Separation of Tasks: No direct view