BU
D. Ang
Abstract The MAX
top up into injector for aphase 2) [1achromats wmomentum ctogether withphase space.the achromattracking thromode.
The MAXand construcenergy linac will be opersingle pass sps x-ray puldrive both inproduce highrelaxed demdemands a buresults, preseare easily obtwo of the Mable to prodSuch results
TThe same
to drive bothFERMI gun linac sectionof a 35 MW power will b
UNCH CO
Sgal-Kalinin
X IV linac willtwo storage ra Short Pulse1]. Compress
with positive Rcompaction, Th weak sextu In this procet compressorsough the MAX
MX IV project [2
tion has starteand a Short
rated at 1.5 aspontaneous lilses. The injenjection and toh brightness p
mands on emiunch length bented later in tbtained with tMAX IV projduce low emihave also bee
THE MAXphoto cathod
h ring injectio[3]. The acc
ns together wiklystron and
be doubled wi
OMPRES
S. Thorin, MJ. McKenz
l be used bothrings, and as
e Facility (SPFsion is doneR56. The nat
T566, from theupoles to lineeeding we pres and initial reX IV Injector
MAX IV 2] at MAX-labed to build 2 sPulse Facility
and 3 GeV. Tinac lightsourctor will be fop-up for the
pulses for the ittance ( < 1elow 100 fs Fthis paper, shothe MAX IV ect, the injecttance pulses
en produced in
X IV INJECde RF electronon and SPF. Iceleration is dith 15 RF unia solid state mith a SLED. T
Figure 1:
SSION BYTHE MA
M. Eriksson,zie, B. Milit
h for injectiona high brigh
F) and an FEe in two dotural second e achromats isearise longituesent the desiesults from pain high brigh
b has been funstorage rings, y (SPF). The The SPF will rce, producingflexible enoustorage ringsSPF. The SPF0 mm mrad)
FWHM. Simulow that such p
injector. In pctor should als
to drive an n simulations.
CTOR n gun will be It is a copy odone in 39 S-its, each consimodulator. ThThe repetition
Schematic ov
Y LINEAAX IV INJ
S. Werin Msyn, P. Will
n and htness EL (in ouble order
s used udinal gn of
article htness
nded, a full rings be a
g sub-gh to s, and F has ) and lation pulses phase so be FEL.
used of the -band isting he RF n rate
of thrings Gen Thewithquadinjeccompapprsche
DouLine
Tcompunliknegaof thnaturlineachoooptimlinac
A dispepositcouldsextu
ThoversextuT566full sextu
verall layout o
ARISING AJECTOR
MAX-lab, Lliams, STFC
he injector is s will be at 10
neral Layou lattice in the
h focusing qdrupole, and ction into thpression is
roximately 26matic view of
uble Achromearisation The magneticpressors in thke the commoative R56. Wehe RF voltagrally have a parising effect ose the opticmal linearisatic for this purp
sextupole is ersion at the tioned at the d be compareupoles in a stohe natural T5r-linearising upoles work i6, to compens
linearisationupole strength
of the MAX IV
ACHROMR
Lund, SwedeC/DL/ASTe
100 Hz, but t0 Hz.
ut e main linac iquadrupole, l
linac. The he rings at
done in 60 MeV and af the layout ca
mat Compre
c double ache MAX IV inonly used mage have thus toge. Both typpositive T566
in the achral parametersion without nose. needed to mend of the achromat m
ed with the corage ring. 66 of the douthe RF indin the opposi
sate for the ovn of longituh has to be i
V Injector.
MATS FO
en eC, Daresbu
top up and inj
is done as a Flinac sectionbeam is kic1.5 and 3
double acat full energyan be seen in F
ession and
chromats usenjector has a gnetic chicaneo work on thepes of bunch
and a positivromat case. Ws in the ach
needing to hav
minimize the achromat. Th
middle, is rathchromaticity c
uble achromaduced curvatuite direction oer-linearisatio
udinal phase increased [4].
OR
ury, UK
njection to the
FODO latticen, defocusingcked out forGeV. Bunch
chromats aty, 3.6 GeV. AFigure 1.
ed as bunchpositive R56
e which has ae falling slope
compressorsve T566 has aWe can thus
hromat to getve a harmonic
second orderhis sextupole,her weak andcompensating
ats is actuallyure and theof the naturalon. To achieve
space, the This can be
e
e g r h t
A
h 6 a e s a s t c
r ,
d g
y e l e e e
Proceedings of FEL2010, Malmö, Sweden WEPB34
FEL technology I: Injector and Linac 471
done in suchclosed at thedispersion beFor a spontana problem. Bsatisfying linemittance pu
One singlsecond-orderThe relevant angle or posithe achromatthese terms. the beam insconstruction Since the R5crest RF phaSchematic vachromat buFigure 5. CoBC’s for theand for the F
Figu
Figu
h a way that e end of the Becomes large,neous source
But even withonearisation ca
ulses, althoughle achromat r effects actinones are ener
ition. The intrts bending in We will also
stead of a chof the linac h
56 of the douase is used t
views, dispersunch compressmpression and
e SPF optimisFEL optimisati
ure 2: Layout
ure 3: Layout
second orderBC, but the en leading to inlike the SPF t
out over-tuninan be achieveh at a lower pe
will also inng in the trargy-dependentroduction of aopposite dire
o effectively gange of angleall.
uble achromato vary the cosion and optsors can be sd linearisationsation are preion in Table 2
of bunch com
of bunch com
r dispersion snergy derivatincreased emittthis is howeve
ng the sextupoed to produceeak current. nduce some ansverse direct and thus linea double achroections, will cget a translatioe, which ease
ts is fixed, thompression faics of the doeen in Figuren parameters oesented in Ta2.
mpressor 1.
mpressor 2.
till is ive of tance. er not oles, a e low
other ction. ear in omat,
cancel on of es the
he off factor. ouble
e 2 to of the able 1
Fig
Fig
Tablhigh
R
T
E
L
Is
gure 4: Optics
gure 5: Optics
e 1: Compresh peak current
R56
T566
Energy
Linac phase
Integrated sexstrength
and dispersio
and dispersio
sion and lineaoptimisation
BC1
3.23
9.26
275 M
32○
xtupole ± 10
on in bunch co
on in bunch co
arisation param
BC2
cm 2.6 cm
cm -17.8
MeV 3700 M
17.5○
m-2 ± 10 m
ompressor 1.
ompressor 2.
meters in the
m
cm
MeV
m-2
WEPB34 Proceedings of FEL2010, Malmö, Sweden
472 FEL technology I: Injector and Linac
Table 2: Comlow emittanc
R56
T566
Energy
Linac pha
Integratestrength
BEAMA realistic ASTRA [5] first linac moread into Elethe bunch clongitudinal longitudinal radiation. Befound in Tab
Figur
mpression andce optimisation
ase
ed sextupole
M DYNAMbunch distr
to optimise podule L0. Theegant [6] for compressors.
wakefields space charg
eam parametele 3.
re 6: Simulatio
d linearisationn BC1 B
3.23 cm 2
33 cm 8
275 MeV 3
32○
± 5 m-2 ±
MICS SIMUribution was parameters upe bunch was ttracking throThe effects
were incge and coh
ers after the el
on results for t
n parameters i
BC2
2.6 cm
8.5 cm
3700 MeV
15.5○
± 4 m-2
ULATIONSgenerated
p to the end othen convertedough the linacof transverse
cluded, as erent synchrlectron gun ca
the high peak
in the
S using
of the d and c and e and
was rotron an be
Tamo
E
Δ
N
Hig Selongset uemitshowcomplineais acand the erespeemitaccebelow
current optim
able 3: Beam podule Energy
ΔE/E
Norm. emittan
gh Peak Curxtupoles in itudinal phasup is optima
ttance degradaws the propertpressor. It arisation is effchieved. This slice emittaneffect of shifect leading ttance value optable numbew 10 mm mra
misation for the
parameters aft
105 M
1.5 %
nce 0.4 m
rrent Optimithe achromae space curval for the shation is not oies of the buncan be seen
ffective and this done at thece. Coherent
fting trailing pparticles, givof 2.5 mm m
er for the SPF,ad.
e SPF.
fter the gun an
MeV
% (FW)
mm mrad
isation ats were tuneature was mihort pulse faof great concnch at the exit n that comphat a peak cure expense of b
synchrotron particles tranving the finmrad. This is, which needs
d first linac
ed such thatinimised, thisacility whereern. Figure 6of the second
pression andrrent of 20kAboth projectedradiation hassversely withal horizontals still a verys an emittance
t s e 6 d d A d s h l y e
Proceedings of FEL2010, Malmö, Sweden WEPB34
FEL technology I: Injector and Linac 473
Low Emitta In order toelectron lasedegradation tuning the sethe chromaderivative olongitudinal not comprecurrent again7 shows thcompressor 2well preservstudies at sisufficient to
Outlook
In order compressors disturbing thsextupole famexamined bcompressors
ance Optimo provide a ber we must as much as p
extupoles in batic amplitudf dispersion, linearisation ss as aggresnst final projehe bunch pro2. We see thaved. The peakimilar facilitiedrive an FEL.
to make more flex
he energy dermily could bebefore the is decided.
Figure 7: Sim
misation bunch suitablsuppress tra
practicable. Thbunch comprede functions
in exchangeof the bunch. ssively, therected and slice
operties at that the bunch sk current is es suggest th.
the double xible to tunrivative of die added. This final design
mulation resu
le to drive a ansverse emithis is achievessor 2 to min
s and chrome for relaxing
In addition weby trading e emittance. Fhe exit of bslice propertiereduced, how
hat 3kA woul
achromat bne T566 wiispersion, an possibility w
n of the b
lts from the lo
free-ttance ed by imise matic g the we do
peak Figure bunch es are wever ld be
bunch ithout extra
will be bunch
MdriveextrachanR56
[1]
[2]
[3][4]
[5]
[6]
[7]
ow emittance
Many options ter are availaba linac sectionnging the sec
chicane. Mor
S. Werin et aPhysics ReseaMAX IV cohttp://www.mMAX-IV-CDM. Trovò et aR. J. Englandlongitudinal tdispersionlessSpecial TopicK. Flöttman. Awww.desy.deM. Borland. ECode for Acc(2000). S. werin et alRay FEL Driv
optimisation. to use the MAble. Examplens to reach higcond bunch cre about this c
REFEREal., Nuclear Inarch A 601 (2onceptual des
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., “The MAX ver.” WEPA1
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MOPC080. upole correctioelativistic beamections.” Phyrs And Beamsr Manual (200lo. xible SDDS-C
ulation. APS L
IV Injector as1, These proc
or as an FELes are addingenergies, and
or a negativehere [7].
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L g d e
n
L
WEPB34 Proceedings of FEL2010, Malmö, Sweden
474 FEL technology I: Injector and Linac