RUPAC2006 Talk Weis PPT2003 - TU Dortmund
Transcript of RUPAC2006 Talk Weis PPT2003 - TU Dortmund
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Status of the 1.5 GeVSynchrotron Light Source DELTA
and Related Accelerator Physics Activities
Thomas Weisfor the machine and accelerator physics group
Dortmund UniversitySynchrotron Radiation Center
DELTA
2006 RuPAC, September 10-14, Novosibirsk
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Content:• Machine Status• Insertion Devices• Orbit Control• EU-Cavity Beam Test• Instability Investigation• Machine Optics• Frequent Injction Mode• Summary
Dortmund UniversityGermany
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
DELTA
TGM
3
U250FZ Jülich
BL12: BL12: MethodsMethods (II): Soft X(II): Soft X--RaysRays
• Photoemission
• Photoelectron Spectroscopy
• Fermi-Surface Mapping
SAW
L=115,2 m
E=1.5 GeV
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Full energy booster BoDo
full energy 1.5 GeVramped storage ring~ 0.1 Hz rep. rate
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
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output energy = 75-80 MeVtotal length = 6.4 m (E = 12.5 MV/m)old SBTF-structure from DESY, Hamburg
Linear Injector
thermic electron gun50 keV, 2 A single bunch modefew bunch mode
3 GHz - klystron
40 MW loss power(ohmic losses in copper)
4 µsec RF-pulses@ a few Hertz repetition rate
A. Jankowiak, T. Weis et al., Proc 2000 EPAC (2000) 636
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
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Single cell cavity @ DELTA
400 kV @ 500 MHzRF-power 50 kW cwloss power cavity 30 kWenergy transfer to beam 20 kW
single RF-DORIS-type500 MHz resonator
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
3 %coupling
16 nm rad @ 1.5 GeVhorizontal emittance
> 8 h multi bunch @ 1.5 GeV;> 20 min single bunch @ 542 MeV
beam lifetime
130 mA multi bunch @ 1.5 GeV;25 mA single bunch @ 550 MeV
nominal beam current
115.2 mcircumference
1.5 GeVmaximum beam energy
Maschine Parameters DELTA
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
User operation 2004/2005Operation 2004/2005
30 weeks (3000 h)
2000 h user operation.
1000 hours machine optimisation
and machine physics
Performance 2004/2005:
Average availability during 20 user weeks 94/89 %.
Max. beam current 120 mA.
Average lifetime ~ 7hrs
Availability during user weeks 200514.11.05
12.12.05
05.12.05
07.11.05
24.10.05
10.01.05
17.01.0531.01.05
11.04.0518.04.05
06.06.05
13.06.05 22.08.0517.10.05
19.09.05
26.09.05
101520253035404550556065707580859095
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
User weeks 2005
Ava
ilab
ility
[%
] 07.02.05
07.03.05
14.03.05
20.06.05
15.08.05
Performance 2006:
availability ~ 90%
Max. beam current 130 mA.
Average lifetime ~ 8-10 hrs
only minorvacuum openings
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Insertion devices @ DELTA
U55 permanent magnet undulatorACCEL Instruments
SAW superconducting 5.3 T asymmetric multipole wigglerACCEL Instruments
U250 electromagnetic undulatorin house fabrication, also acting as FEL undulator
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
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phot
ons/
s/m
A/m
m2 /
mra
d2 /
0.1%
BW
D. Schirmer et al., Proc. 2004 EPAC (2004) 2296
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Parameter Dipole Wiggler (sym. mode)
Wiggler (asym. mode)
Magnetic field [T] 1.51 2.79 5.30 Critical current [A] @ 5T and 4.2 K 471 Number of periods 10 5 Beam stay clear [mm] 40 10 10
Horizontal opening angle θθθθ of radiation [mrad]
± 13 ± 25
Critical energie εεεεC [keV] 2.26 4.18 7.93
Critical wavelength λλλλC [Å] 5.49 2.97 1.56 Power P [W/mrad] 4.30 166.89 317.04 Vertical integrated photon flux @ εεεεC [photons/s/mrad/0.1%BW]
4.61·1012 6.86·1013 2.16·1013
Type of radiation (off-plane)
elliptical polarised
linear polarised high intensity
great fraction of circular polarisation at high intensity
Liquid He consumption ~ 12 liters/day with beam
Superconducting 5.3 T asymmetric multipole wiggler @ DELTA
first superconducting multpole wiggler worldwide
serving3 hard-X-raybeamlines
D. Schirmer, Int. J. Mod. Phys. 2B (1993) 644
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
under commissioningoperational end 2006
6 – 200 eVvalence band spectroscopy, Fermi-surface mapping
BL 12 / dipole(U Dortmund)
user operation55 - 1500 eVphotoemission spectroscopy, photoelectron diffraction
BL 11 / U55(U Dortmund)
under constructionoperational 2007
4 - 30 keVEXAFSBL 10 / SAW 1(U NRW)
user operation4 - 30 keVgrazing incidence X-ray diffraction,SAXS, XSW, inelastic X-ray
scattering
BL 9 / SAW 2(U Dortmund)
under commisioningoperational end 2006
2 - 30 keVmaterial science, EXAFS, diffractionBL 8 / SAW 3(U Wuppertal)
user operation5 - 400 eVphotoemission, spectroscopy BL 5 / U250(FZ Jülich)
user operationwhite beamX-ray fluorescence spectroscopyBL 2 / dipole(ISAS)
Present statusPhotonenergy
ExperimentsBeamline
SR-Beamlines @ DELTA
Wiggler Beamlines
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Orbit Control and Stability
slow (0.1 – 1 Hz) globalorbit feedback system
method:
• singular valuedecompositionbased on a measuredorbit response matrix
M. Grewe et al., Proc. 2004 EPAC (2004) 2568
nrrrr
⋯
321
N correctors
M B
PM
s
= Rij
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Orbit Stability
M. Grewe, thesis, Univ. Dortmund 2005
BPM 51
BPM 29
beam current
bea
mcu
rre
nt
bea
mo
rbit
dev
iatio
n[m
m]
location withhigh emphasis
floatingorbit
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Orbit Stability
M. Grewe, thesis, Univ. Dortmund 2005
BPM 51
BPM 29
beam current
bea
mcu
rre
nt
bea
mo
rbit
dev
iatio
n[m
m]
• limited number of BPMs and correctors
• limited corrector strengths
• beam current (heat load) induced movement of vacuum chambers and quadrupols
• ongoing program concerning machine surveillanceand magnet repositioning and......
• ..... decoupling of quadrupoles and vacuumchambers (BPMs)
• nevertheless: reference orbit is reproducibleover months within +/- 250 µm horizontallyand +/- 150 µm vertically
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Fast Beam andInstability
Investigationbunch train signal - 2 ns spacing
• filling pattern measurementbunch by bunch, turn by turn
• postmortem analysis of beam lossdue to coupled bunch mode- CBM – instabilities
• real time longitudinal CBM instability detectionDELTA BPM set up
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Bunch by Bunch Beam Analysis
time [ns]
• sampling of BPM sum signalat 2 GS/s, bandwith 1 GHz
• oversampling technique using shiftbetween RF frequency and sampling frequency
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
I > 95 mA
I < 90 mAfilling pattern+ option to inject beam
into specific bucketsCoupled Bunch Mode No. 1 - 192
Osc
illa
tion
Am
plit
ud
e (d
egre
e)
real time (~ 1 s delay)analysis of longitudinal
coupled bunch CBM modes
J. Kettler et al., Proc. 2006 EPAC (2006) 1034
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
CBM Investigations @ DELTADORIS type cavity
I th≈ 75mA
I th≈35mA
E= 1.5 GeV T = 40-60 °C
I= 87mA
L1/L4
L16?
?
Osc
illa
tion
Am
plit
ud
e (d
egre
e)
Coupled Bunch Mode No. 1 - 192
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Full understanding of filling pattern induced mode spectra
• 144/192 buckets filled• induced synchr. frequency
spread• Landau damping
Spectrum measured withDORIS cavity @1.5GeV
BLUE: measuredGREEN: theoretical
Osc
illa
tion
Am
plit
ud
e (d
egre
e)
Coupled Bunch Mode No. 1 - 192
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
CBM 22
CBM 52
ThresholdCBM 22
Oct. 18th 2005
ThresholdCBM 52
E= 1.5 GeV
CBM Investigations @ DELTADORIS type cavity with damping antennas
Osc
illa
tion
Am
plit
ud
e (d
egre
e)
Coupled Bunch Mode No. 1 - 192
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
EU-Project:Design, Construction and Beam Test of a n.c. HOM-damped
500 MHz-Resonator for Synchrotron Radiation Sources
1998 - 2004
Alu-model
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
The HOM-Damped EU-Cavity
Single Trapped Mode Resonator
Ridged waveguidesNose cones
Plunger
• Waveguide cut-off between fundamental and first HOM frequency
• HOM energy is dissipated in external RF loads
RF window
Cavity design: F.Marhauser & E.WeihreterBESSY, Berlin
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
F. Marhauser, E. Weihreter, Proc. 2004 EPAC (2004) 979Proc. 2002 EPAC (2002) 2172
Residual Longitudinal Impedance
Frequency [MHz]
Imp
edan
ceZ
[Ω]
Z|| < 5 kΩ• complex time domain calculationsfor a very complexgeometry
• full validation of calculations by bead-pull measurements (o)
• effective dampingalso of transverse Z
o = measured data
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
EU-Cavity Test @ DELTA
5/2004 – 9/20047/2005 – 8/2006
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
CBM Characterisation of EU-Cavity
Filling pattern:144/192 buckets filled,
Spectrum measured withEU cavity @1.5GeV
Osc
illa
tion
Am
plit
ud
e (d
egre
e)
Coupled Bunch Mode No. 1 - 192
CBM 52 not induced bycavity, also seen with theDORIS-type cavity
responsible Z|| ~ 9 kΩ
reason still unknown:
candidates:
• strip line kickers
• broken RF-contacts inbellows, valves
• resonant vacuumchambers and tapers
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Summary EU-Cavity Beam Test• Successful test with beam @ 1.5 GeV (I = 140mA) and @ 542
MeV (I = 280 mA).• No cavity induced instabilities have been found.• Cavity was successful operated over more than one year in
regular user shifts.• Loss power capability of the prototype limited to 20-30 kW due to
non sufficient RF contact between HOM-dampers and body.thermal stress + micro vacuum leaks
• New HOM-damper design (BESSY) with invacuum ferrites avoiding RF-window and external HOM loads.
• ALBA (Barcelona Light Source) and the Metrology Ring (Berlin)will be equipped with EU-type cavities.
• The ESRF is planning to adept the philosophy of HOM-damping.
E. Weihreter et al., Proc. 2006 EPAC (2006) 1280R. Heine et al., Proc. 2006 EPAC (2006) 2856
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
O. Kopitetzki et al., Proc. 2006 EPAC (2006) 1945
• 2 independent measurements ofoptical β−functions.
• tune scan method (local variationof quadrupole strengths and orbitresponse matrix analysis (ORM).
• comparable results but at different locations
• ORM-analysis provides sensitive information on phase beating
Modelling of theMachine Optics
a big step forward towards a bettermachine modelling.
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Example: Horizontal „Phase Beating“Phase Advance Deviations between Model and Measurement
modified model
refined quadrupolestrengths andmagnet locations
minimisation of ∆Ψ
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Frequent Injection @ DELTA
time
bea
mcu
rren
tan
d li
fetim
e
125 mA +/ 5 %
constant lifetime
~ 7 h
G. Schmidt et al., Proc. 2004 EPAC (2004) 2299
• increased average beam current
• increased photon flux for users
• constant heat load on chambersand beam lines
• increased machine stability
• machine tests with shuttersclosed successful.
• discussions with users and approval authorities ongoing.
Universität Dortmund
2006 RUPAC, September 10-14, Novosibirsk
DELTADortmunder Elektronen-Speicherring-Anlage
Acknowledgments
Financial supportfrom university, EU,
NRW, FZJ and BMBF
Help fromcolleagues from
ESRF, ALBA, SLS, Diamond.........
EU-cavity collaborationcolleagues from:
BESSY, DaresburyCLRC, MaxLab, NTHU
DELTA machineand accelerator physics
group
organisers of RuPAC