Joel Chavanne, Gael Le Bec European Synchrotron Radiation Facility
The Photon Sources for The ESRF-EBS
PHANGS workshop, Elettra, Trieste, Italy, 4-5 December 2017
OUTLINE
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
ESRF-EBS Insertion Devices in EBS context • Migration & adaptation
• Minimum ID gap
• IDs schemes
Bending Magnet beamlines Summary
* EBS: Extremely Brilliant Source
EBS: BRILLIANCE
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
ESRF Lattice Present EBS
Hor. Emittance [nm] 4 0.134*
Vert. Emittance [pm] 5 5
Energy spread [%] 0.1 0.095
Betax / Betaz [m] 37/3 6.8/2.9
Beam current [mA] 200 200
1015
1016
1017
1018
1019
1020
1021
1022
Bri
llian
ce [
Ph/s
/0.1
%bw
/mm
2 /mr2 ]
3 4 5 6 7 8 91 keV
2 3 4 5 6 7 8 910 keV
2 3 4 5 6 7 8 9100 keV
Photon Energy
1.6 m W150
4 m Helical U88
3.2 m U42
4.8 m U35
4 m CPMU18
Present lattice (dashed) New lattice (plain )
4 m CPMU14
0.85T BM 0.4T BM
0.54T BM
* w/o IDs
EBS: TRANSVERSE COHERENCE
Page 4
10-5
10-4
10-3
10-2
10-1
100
Coh
eren
t Fra
ctio
n []
3 4 5 6 7 8 91 keV
2 3 4 5 6 7 8 910 keV
2 3 4 5 6 7 8 9100 keV
Photon Energy [keV]
4 m helical U88
4 .8 m U35
4 m CPMU18
Present lattice (dashed)New lattice (plain)
Coherence fraction (expressed in 𝝀∕𝟐𝝅 ) PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
EBS MAGNETS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
IDM* group task, except IDs • Magnet design
• Procurement (about 1000 magnets)
• Measurements and fiducialization
*IDM: Insertion Devices and Magnets
The EBS mock-up cell
PM DIPOLES: FROM CONCEPT TO IN-HOUSE SERIAL PRODUCTION
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Longitudinal field steps Design view Assembly, measurement and alignment
In a few words… 132 dipoles, 1.8 m each 6 tons of Sm2Co17 Completed in October 2017
EBS MASTER PLAN (2015-2020) MasterPlanandMajorMilestones
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
PHOTON SOURCES : INSERTION DEVICES
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Situation at the restart (2020) • Same energy: 6 GeV
• Most of the existing ID to be reused in the EBS
• About 90 magnetic assemblies installed
• 33 standard in-air undulators
• 18 revolver undulators
• 13 IVUs and CPMUs
• 8 other devices
• Length of the straight sections: 5 m
• Same length for most of sections
• Length reduced 6 m è 5 m on a few sections
• Adaptation work on IVUs and CPMUs
IVU AND CPMU COMPATIBILITY ISSUES
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
absorber absorber
IVU adaptation • Integration of photon absorbers on both sides • Modification of water cooling circuit (IVUs) & flexible transitions • New conical chambers at both ends • Implementation before September 2019
NEW UNDULATOR SUPPORTS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
2.3 m undulator 2.3 m revolver undulator
Can be used for any refurbishment and upgrade of ID straights after EBS initial operation Two devices / ID straight, can be combined with an IVU/CPMU
CANTING IN EBS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Adaptation of the canting sections • PM canting magnets installed since 2012
• Entry and exit angles to be provided by the main
dipoles
• Nearest dipole strength reduced by 2 to 2.7 mrad
• Middle canting magnet: same as present
Beam position at beamline location • Same as present
• Max displacement: 0.2 mm
Strength reduction 2.7 mrad
ID MINIMUM GAPS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Collimator design view
Top-up operation for the EBS • Smaller beam lifetime (Touschek) • Increased beam losses at small apertures ( IVUs/CPMUs) Beam losses must be localized on collimators • Important studies with present SR (top-up, 16 bunch) • Validation of the beam losses model Two collimators to be installed on the EBS • Important studies with present SR (top-up, 16 bunch) • Cell 13 & 24 • 30 cm long tungsten blades • Variable horizontal position • Important shielding around collimators
COLLIMATION OPTIMIZATION
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Scraper studies • 80% of the losses relocated on the scrapers
• 4% lifetime reduction
SHORT PERIOD CPMUS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
ID straight
Period [mm]
Length [m]
Gap [mm]
Peak Field [T]
PM Instal. date
6 18 2 6 0.88 NdFeB Jan. 2008
11 18 2 6 1 NdFeB Jan. 2012
31 14.4 2 5 1 PrFeB Jul. 2016
ID6 CPMU
CPMUs in operation Plans • Large demand from beamlines
• One lab fully dedicated to CPMU/IVU construction (2020)
IN-SITU HALL PROBE MEASUREMENTS OF CPMUS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Hall Probe
Rails Linear encoder
Final vacuum chamber
Undulator
Reflectors
Design view of the in situ Hall probe bench (stretched wire system not shown)
Inside the bench
(Design in collaboration with ProActive Engineering, Spain)
IN-SITU HALL PROBE MEASUREMENTS OF CPMUS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
He-Ne laser Collimator
Beam splitter
2D PSDs
Mirrors
Double retro-reflector
IN AIR OPTICAL BENCH IN VACUUM HALL PROBE
Laser setup for the measurement of the transverse positions and roll angle of the Hall probe.
1.2
1.0
0.8
0.6
0.4
Peak
Fie
ld [T
]
10987654Gap [mm]
MAGNETIC MEASUREMENTS: CPMU14
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
1.0
0.5
0.0
-0.5
-1.0
Field
[T]
2.01.51.00.5Longitudinal position [m]
Gap 5 mm 97 K
2.6
2.4
2.2
2.0
1.8R.M
.S P
hase
err
or [D
eg.]
8.07.06.05.0Gap [mm]
T=95 K T=95 K
CPMU14:MEASURED PHOTON BEAM SPECTRUM
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
6.56.05.55.0Gap [mm]
1.2x1012
1.0
0.8
0.6
0.4
0.2
0.0
Phot/
sec/0
.1%
Gap scan around harmonic 7 (100.75 keV) (Courtesy V. Honkinaki)
Computed gap scan with error free undulator
≈50 µm
MEASURED PHOTON BEAM SPECTRUM (CONT’D)
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Energy scan from beamline 63 keV-130 keV Undulator gap 5.4 mm ( V. Honkinaki)
Computed Energy scan 63-130 keV Undulator gap 5.35 mm Ideal undulator with measured peak field 0.04 mm gap tapering Aperture: 300µm x300µm @ 30 m
1010
1011
1012
Ph/s
/0.1
%bw
130keV120110100908070Photon Energy
error free undulator 'error free undulator , gap tapering 40µm
CPMUS MAGNETIC ASSEMBLIES
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Fe-co poles PrFeB magnet blocks
Magnet holders • Based on the last CPMU (14.5 mm period)
• Efficient phase error correction
• Fine tuning of individual poles
Standard design • Now fully parameterized
• 10 mm to 21 mm period
• Adaptable to any length
• End field structure included
LN2 COOLING INFRASTRUCTURE IN EBS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
LN2 cooling loop • To be implemented in the technical
gallery
• For future CPMU installation
• LN2 outlet in each cell
• Available at restart of EBS
• Cell 32, 1 and 2 need further
studies
ID CONSTRUCTION FROM 2020
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
CDR # Application BL Source
1 Coherence applications ID10 2 x CPMU18
2 Hard X-ray diffraction microscopy ID08 CPMU14, CPMU18
3 Large phase-contrast tomography BM18 3 pole wiggler
4 Surface science ID03 U27/U35
5 Extreme conditions ID27 2 x CPMU18
6 Dynamic compression studies ID23-ID24 CPMU18, CPMU12
BENDING MAGNET SOURCES: CONTEXT
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
Present ESRF DBA 6 GeV lattice Very productive BM beamlines BM sources è 0.856 T bending magnet, 𝐸↓𝐶 =20.5 keV è 0.4 T soft end, 𝐸↓𝐶 =9.5 keV è 6 mrad max
ESRF EBS 7BA 6 GeV lattice BM sources Combined low field dipole-quads (DQ) è 0.39 T DQ, 𝐸↓𝐶 =9.3 keV è 0.57 T DQ, 𝐸↓𝐶 =13.6 keV è 2 mrad max
GEOMETRICAL CONSIDERATIONS
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
BM Fans 4mrad
BM X-Ray fans limited to 4 mrad due to limitations imposed on photon beam path in magnets
0 mrad ref
INCOMING BEAM(S) AT BEAMLINE (DQ2C & DQ1D ONLY)
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
Verti
cal a
ngle
[mra
d]
-9 -8 -7 -6Horizontal angle [mrad]
E=10 keV
DQ2CDQ1D
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
Verti
cal a
ngle
[mra
d]
-9 -8 -7 -6Horizontal angle [mrad]
E=50 keV
DQ2CDQ1D
2 separated beams Storage ring tunnel Experimental hall
160x109
1208040
0Phot
on fl
ux [a
.u]
-9.0 -8.0 -7.0 -6.0Horizontal angle [mrad]
30x109
20
10
0Phot
on fl
ux [a
.u]
-9 -8 -7 -6Horizontal angle [mrad]
PROPOSED ALTERNATIVE SOURCES
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
10mm
5
0
-5
-10
Verti
cal P
ositi
on
-40mm -20 0 20 40Horizontal Position
-10mm
-5
0
5
10
Verti
cal P
ositi
on
40mm200-20-40Horizontal Position
-10mm
-5
0
5
10
Verti
cal P
ositi
on
40mm200-20-40Horizontal Position
Options available Short Bending Magnet (SBM)
• 2 mrad X-ray fan
• 7 SBM to be installed
2-poles wiggler (2PW)
• 1.7 mrad fan
• 2 configurations
• 6 2PW to be installed
3-pole wiggler
• 1.6 mrad fan
• 2 3PW to be installed
Peak field: 0.86 T for all sources White beam at 25 m
SHORT WIGGLERS & SBM INTEGRATION
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
SBM insertion
SUMMARY
PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017
ESRF EBS Procurement in progress, assembly started Insertion devices • Initial operation with present ID segments • Operational experience very positive with CPMUs • Large demand for CPMUs/ IVUs to anticipate • Dedicated lab for construction of CPMUs Bending Magnet beamlines • New sources: SBM,2PWs,3PWs