Transcript MM_and_Alignment_6-28-04.PPT

Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Magnetic Measurements
and
Alignment Issues
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
UNDULATOR
Set-Up 2
Optical Alignment requires direct line of
sight between instrument and target
 fiducials need to be either on aisle side
or on top of component
Set-Up 1
Undulator Alignment Process
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Alignment Operation and Tolerances (PM Quads)
Quadrupole alignment
Quadrupoles too small to carry fiducials
is accomplished by relative alignment to adjacent undulator
Carried out in MMF using CMM, no optical alignment involved
undulator wrt to BBA-aligned quadrupoles relative alignment requirements: 70
µm in Y, 300 µm in X
Using the undulator fiducials to align quadrupoles: fiducialization quadrupole
axis to quadrupole fiducials to undulator fiducials X, Y 30 µm
Undulator
Cradle, quadrupole, BPM are aligned wrt undulator fiducials
Carried out by optical alignment, supported by HLS and portable stretched
wire measurements
Quadrupole ab-initio position tolerance driven by BBA requirements; BBA
quality is correlated to quality of initial alignment – mover motion range is
about 3-times StD of alignment  BBA residual offsets are among others a
function of quality of initial alignment
Alignment StD of 150 µm sufficient for BBA to converge, goal is alignment StD
of < < 100 µm
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Alignment Fiducials and Abbe’s Law
Abbe’s Law postulates that in
order to avoid 1st order errors,
the measurement needs to
take place in the principle
plane of the dimension
Hence:
Horizontal measurement wrt
fiducial in horizontal plane
Vertical measurement wrt
fiducial in vertical
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Linac Coherent Light Source
Effect of violating Abbe’s Law (1)
0.1787
0.0522
0.052
0.179
Already placing the top
fiducial not exactly in vertical
plane of rotation creates too
much of a roll correlation,
assuming 1 mrad roll
Need to change fiducial
position into plane of rotation,
or need to control roll about
0.1 mrad
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
0.2312
0.231
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Effect of violating Abbe’s Law (2)
0.179
0.179
Roll Tolerance presently defined
= 1mrad
To reduce roll correlation to
become insignificant, tolerance
needs to be 0.1 mrad
This requires to set elevation of
both fiducials to better than 10
µm  cannot be done with
optical measurements
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
0.231
0
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
“Gap open to Aisle” Fiducial Design
Gap open to aisle requires
two fiducials per crosssection on top of undulator
Additionally, two reference
surfaces to set roll using
machinist level, one near
either end
Do we need roll reference in
any case, e.g. is present roll
tolerance consistent with
vacuum chamber stay clear?
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
MMF Lay-out
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
New MMF lay-out
Modified Lay-out Highlights
Separation of magnetic
measurements operation from
fiducialization and assembly
Allows different temperature
zones:
mag.meas
CMM / assembly
Loading / Storage
+/-0.1degC
+/- 1 degC
+/- 2.5degC
Assembly line type lay-out
Storage capacity for most (all)
undulator segments
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Installation Schedule
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Installation and Alignment Schedule: Assumptions
Goal: Get ready for commissioning in July / August 2007
SPEAR3 approach, complete as much work as possible before
installation during pre-assembly
Aggressive concurrent scheduling
Optimize time not man-power
Only one shift work
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Pre-assembly of installation units
Pre-assembled granite tables and cradles
Pre-assembly of granite tables
Mount support feet
Mount support table and mechanical adjustment system
Mount cam movers
Install temperature acquisition system
Install temperature insulation
Complete cabling, plug-in ready
Pre-align table supports and undulator supports
Pre-assembly of cradles
Attach cam mover kinematics
Install roll-away rails (& mover system)
Install undulator, quadrupole and BPM
Install vacuum system
Complete cabling, plug-in ready
Fiducialize and align
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Alignment Scheme
All components use registration keys to preserve pre-alignment
Install and measure alignment network
Install floor anchors and foot plates
Align foot plates to better than 0.5 mm
Install granite tables onto foot plates
Re-measure alignment network
Align undulator mechanical supports
Install cradles
Install HLS and WPM
Re-measure alignment network
Align undulators
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Installation and Alignment Schedule (Version 0.1)
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Integration
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Integrating Monitoring Systems into Cradle / Support System
Since the cradle needs to be easily
removable, we cannot attach the
monitoring systems to it. Hence,
both WPM and HLS need to be
mounted to support table.
However, the mounting has to be
accomplish in a way which will
force the sensors to follow the
cradle motion
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Integrating Monitoring Systems into Cradle / Support System
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
HLS Stability and Resolution
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
Integrating Monitoring Systems into Cradle / Support System
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
Linac Coherent Light Source
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
WPM Stability and Resolution
Wire System Resolution - Monitor 1 horizontal -
Wire Monitor Resolution - 24 Hours at Monitor # 1 0.150
0.4
0.3
Linear (Reihe1)
Monitor Position [ Micrometer ]
Wire Position [ Micrometer ]
Reihe1
0.100
0.2
0.1
StdDev.: = 6 Nanometer
0.050
0.0
-0.1
-0.2
06
08
10
12
14
16
18
20
22
00
02
04
06
08
0.000
0:00
1:00
2:00
3:00
4:00
Time
Time
LCLS Undulator Physics and Engineering
June 28 & 29, 2004
Robert Ruland, SLAC
[email protected]
5:00