Design Study For The Storage Ring of Turkish Light Source

Zafer NergizNigde University

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY

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Introduction

Zafer Nergiz | Nigde University

• 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.• Effects of the undulators to the beam dynamic is

investigated.

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY

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Layout of the Light source

Zafer Nergiz| Nigde University

The machine consist of mainly three part: Injector, booster ring and storage ring.The radiation properties are strongly depend on the storage ring parameters.Booster and Storage ring is designed.

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY

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Storage Ring

Zafer Nergiz | Nigde University

• The storage ring is composed with 20 main cells• Main cell consists of 4 bending magnets and 4 different

type 16 quadrupol magnets.• The circumference is 477 m• Natural horizontal emittance is 0.51 nm rad.• The number of straight section is 20

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY

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Beam Parameters

Zafer Nergiz| Nigde University

The working point is chosen where the third order resonance driving terms and tune shifts are as small as possible.

7 families of sextupol are used to correct chromaticity and to compensate nonlinearities.

The length of straight sections is 5 m.

The bending magnets are 1.5 m length and the magnetic field in the bending magnets is 0.52 T. The advantage is low rf power requirment.

Parameter ValueEnergy (GeV) 3Circumference (m) 477Beam Current (mA) 500 mABet. Tunes Qx/Qy 34.19/6.15Nat. Chromaticity x0x /x0y -70/-38Cor. Chromaticity x0x /x0y 1.0/1.0Energy loss / turn (keV) 375.1H. emittance (nm) 0.51V. emittance (nm) 0.0051Betaxmax (m) 12.7Betaymax (m) 25.3Betax in the mid. of straight sect.(m) 12.7Betay in the mid. of straight sect. (m) 7.5Dispx in the middle of straight sect. 0.093Number of straight section 20Length of straight section (m) 5Rf Voltage (MV) 3.5Harmonic number 795Max. Number of bunch 795Bunch charge (nC) 1.0RMS Bunch length (mm) 2.1RMS Energy Spread (%) 0.058Momentum Acceptence (%) 4.8Coupling (%) 1Touschek Life time (h) 10.6Momentum Compaction Factor 0.00032

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz| Nigde University

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Beam Parameters vs. Momentum offset

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz| Nigde University

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Beam Tracking

Tracking results from ELEGANT ;500 Particle 1 Million Turn

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz | Nigde University

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Nonlinear Beam Dynamics: Tracking

• According to MADX simulation the shape deformation of phase ellipse start x=1.2 cm and y=1 cm

Phase space tracking in the horizontal and vertical plane at the centerof straight section (1000 turn)

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz | Nigde University

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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)

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz| Nigde University

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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).

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz | Nigde University

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Synchrotron Radiation

Parameters CU18 SU15 IU28 U90lu (cm) 1.8 1.5 2.8 9Np 222 67 142 44Gap(mm) 5 5.6 7 35Kymax 2.25 2.10 2.35 10L (m) 4.00 1.005 4.00 4.0Photon Energy(keV) 1.4-20 1.8-23 0.8-12 0.1-3

In-vacuum undulator (IU),Cryogenic permanent-magnet undulator (CU)Superconducting insertion devices (SU)

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz | Nigde University

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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

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz| Nigde University

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Effect of the ID’s to nonlinear dynamic

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz| Nigde University

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Timetable

2013 2014 2015 2016 2017 2018 2019 2020 2021 2022CDRTDRBuidingTendersInst.First Beam

3RD TAC LIGHT SOURCES USERS’ MEETING (TAC-LSUM 2013) | OCTOBER 5-7 | 2013 | ANKARA UNIVERSITY Zafer Nergiz | Nigde University

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Conclusions

• Low emittance storage ring is designed.• It is reached to 0.51 nm rad emittance with 477 m ring

circumference• Nonlinear effects are also investigated.• Effects of the ID’s to the beam are acceptable values.• It is planned to complete the machine report including main

sub-systems up to mid of next year in parallel to the scientific case report.

Thanks for your attentions