Dr. Zafer Nergiz Nigde University THE STATUS OF TURKISH LIGHT
SOURCE
Slide 2
Outline The Goals of the machine New storage ring design
parameters Synchrotron radiation Comparison of other light sources
with TURKAY Conclusion 2 Zafer Nergiz, UPHUK-5, 07.09.2013
Slide 3
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 3 Zafer Nergiz, UPHUK-5, 07.09.2013
Slide 4
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 Zafer Nergiz, UPHUK-5,
07.09.2013 4
Slide 5
Beam Parameters ParameterValue Energy (GeV)3 Circumference
(m)467.08 Beam Current (mA)500 mA Bet. Tunes Q x /Q y 31.24/6.17
Nat. Chromaticity x 0x /x 0y -68/-35 Cor. Chromaticity x 0x /x 0y
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
section18 Length of straight section (m)6 Rf Voltage (MV)3.5
Harmonic number778 Max. Number of bunch778 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 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 Zafer Nergiz, UPHUK-5, 07.09.2013 5
Slide 6
Beam Parameters vs. Momentum offset Qx and Qy,Emittance, Betax,
Betay, vs. momentum deviation 6 Zafer Nergiz, UPHUK-5,
07.09.2013
Slide 7
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 Zafer
Nergiz, UPHUK-5, 07.09.2013 7
Slide 8
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) Zafer Nergiz, UPHUK-5,
07.09.2013 8
Slide 9
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) Zafer Nergiz,
UPHUK-5, 07.09.2013 9
Slide 10
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 log 10 ( x
+ y )) (1024 turn). Zafer Nergiz, UPHUK-5, 07.09.2013 10
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 Zafer Nergiz,
UPHUK-5, 07.09.2013 12
Slide 13
Zero dispersion option In zero dispersion option the emittance
is 1.18 nm rad Betax=17 m, Betay=7 m Other parameters approx same
Zafer Nergiz, UPHUK-5, 07.09.2013 13
Slide 14
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 Zafer Nergiz, UPHUK-5, 07.09.2013 14
Slide 15
Ref: Nom Namkung IPAC2010 Presentation TAC-SI The Emittance and
Circumference vs. Energy for The Different Light Sources Around the
world Zafer Nergiz, UPHUK-5, 07.09.2013 15
Slide 16
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 Zafer Nergiz, UPHUK-5,
07.09.2013 16