The Photon Sources for The ESRF-EBS - ELETTRA · EBS: BRILLIANCE PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017 ESRF Lattice Present EBS Hor. Emittance [nm] 4 0.134*

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


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


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


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


PHOTON SOURCES : INSERTION DEVICES


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


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


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


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


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


Scraper studies •  80% of the losses relocated on the scrapers

•  4% lifetime reduction

SHORT PERIOD CPMUS


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


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


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


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


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)


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


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


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


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


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


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)


-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]


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]


PROPOSED ALTERNATIVE SOURCES


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


SBM insertion

SUMMARY


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

Documents

The Photon Sources for The ESRF-EBS - ELETTRA · EBS: BRILLIANCE PHANGS Workshop, J Chavanne and G Le Bec, Trieste, December 2017 ESRF Lattice Present EBS Hor. Emittance [nm] 4 0.134*