THE STATUS OF TURKISH LIGHT
SOURCE
Dr. Zafer Nergiz
Nigde University
Outline
 The Goals of the machine
 New storage ring design parameters
 Synchrotron radiation
 Comparison of other light sources with TURKAY
 Conclusion
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Zafer Nergiz, UPHUK-5, 07.09.2013
 The goals of the storage ring suggested after LSUM-
2012 (Light Source User Meeting)
 3 GeV electron beam energy
 Low emittance; below 1 nm rad
 Short circumference; below 500 m
 A new ring is designed according to the suggestions in
user meeting
 Linear and nonlinear effects are investigated
 The radiation properties are investigated.
 Some special cases (such as 0 dispersion) options are
compared
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Zafer Nergiz, UPHUK-5, 07.09.2013
The Parameters and Lattice of The storage ring
 The storage ring is composed with 18 main cells
 Main cell consists of 4 bending magnets and 4 different type 16
quadrupol magnets.
 The circumference is 467 m
 Natural horizantal emittance is 0.68 nm rad.
 The number of straight section is 18
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Zafer Nergiz, UPHUK-5, 07.09.2013
Beam Parameters
The working point is chosen where the third
order resonance driving terms and tune shifts
are as small as possible.
6 families of sextupol are used to correct
chromaticity and to compensate nonlinearities.
The length of straight sections is 6 m.
The bending magnets are 1.8 m length and the
magnetic field in the bending magnets is 0.48 T
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Zafer Nergiz, UPHUK-5, 07.09.2013
Parameter
Value
Energy (GeV)
3
Circumference (m)
467.08
Beam Current (mA)
500 mA
Bet. Tunes Qx/Qy
31.24/6.17
Nat. Chromaticity x0x /x0y
-68/-35
Cor. Chromaticity x0x /x0y
0.4/0.6
Energy loss / turn (keV)
347.4
H. emittance (nm)
0.68
V. emittance (nm)
0.0068
Betaxmax (m)
15.7
Betaymax (m)
26.9
Betax in the mid. of straight sect.(m)
13.9
Betay in the mid. of straight sect. (m)
6.6
Dispx in the middle of straight sect.
0.14
Number of straight section
18
Length of straight section (m)
6
Rf Voltage (MV)
3.5
Harmonic number
778
Max. Number of bunch
778
Bunch charge (nC)
1.0
RMS Bunch length (mm)
2.28
RMS Energy Spread (%)
0.056
Momentum Acceptence (%)
4.3
Coupling (%)
1
Touschek Life time (h)
10.2
Beam Parameters vs. Momentum offset
 DQx and DQy ,Emittance, Betax, Betay, vs. momentum deviation
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Zafer Nergiz, UPHUK-5, 07.09.2013
Touschek Lifetime
 One of the issues of a low emittance storage ring is
Touschek lifetime
 Touschek lifetime is 10.2 h for 3.5 MV rf voltage.
 It is planned to operate the machine in top-up mode
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Zafer Nergiz, UPHUK-5, 07.09.2013
Nonlinear Beam Dynamics: Tracking
 According to MADX simulation the shape deformation of phase
ellipse start x=0.015 m and y=0.01 m
Phase space tracking in the horizontal and vertical plane at the center
of straight section (1000 turn)
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Zafer Nergiz, UPHUK-5, 07.09.2013
Nonlinear Beam Dynamics: Dynamic aperture
 The dynamic aperture is the stable transverse area for the
particle safely without getting defused or lost.
a) Dynamical aperture for different momentum offset without magnet error (%3, %0 , %-3) b)
Effects of magnet errors to the dynamical aperture (1024 turn)
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Zafer Nergiz, UPHUK-5, 07.09.2013
Nonlinear Beam Dynamics: FMA
 Frequency Map Analysis (FMA) is a numerical method which is a possible way
to understand the effect of resonance to the dynamic aperture.
Diffusion rate of frequency map analyses from tracking results. (the colors are for
log10(Dnx+Dny)) (1024 turn).
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Zafer Nergiz, UPHUK-5, 07.09.2013
Synchrotron Radiation
In-vacuum undulator (IU),
Cryogenic permanent-magnet undulator
(CU)
Superconducting insertion devices (SU)
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Zafer Nergiz, UPHUK-5, 07.09.2013
Parameters
lu (cm)
Np
Gap(mm)
Kymax
L (m)
Photon Energy(keV)
CU18
1.8
250
5
2.25
4.48
1.4-20
SU15
1.5
67
5.6
2.10
1.005
1.8-23
IU28
2.8
160
7
2.35
4.48
0.8-12
U90
9
31
35
10
5.4
0.1-3
Effects of the insertion devices
Effects of the ID to the emittance and energy spreead investigated by the formula;
where
Effect of the CU18 to the emittance and energy spread
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Zafer Nergiz, UPHUK-5, 07.09.2013
Zero dispersion option
 In zero dispersion option the
emittance is 1.18 nm rad
 Betax=17 m, Betay=7 m
 Other parameters approx same
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Zafer Nergiz, UPHUK-5, 07.09.2013
Middle dispersion option
 In middle dispersion option the emittance is
0.85 nm rad
 Betax=15 m, Betay=7 m, Dx=0.06 m
 Other parameters approx. same
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Zafer Nergiz, UPHUK-5, 07.09.2013
The Emittance and Circumference vs. Energy for The Different Light Sources Around the world
TAC-SI
TAC-SI
Ref: Nom Namkung IPAC2010 Presentation
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Zafer Nergiz, UPHUK-5, 07.09.2013
Conclusions
 Low emittance storage ring is designed.
 It is reached to 0.67 nm rad emittance with 467 m ring circumference
 Nonlinear effects also investigated
 Different options are compared.
 It is planned to complete the machine report including main sub-
systems up to mid of next year in paralel to the scientific case report.
Thanks for your attentions
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Zafer Nergiz, UPHUK-5, 07.09.2013