TAC Synchrotron Radiation Project Dr. Zafer Nergiz Nigde University Science Faculty Physics Department

TAC Synchrotron Radiation Project

Dr. Zafer NergizNigde University Science Faculty

Physics Department

Outline

• The general layout and goals of the design study of the TAC SR Source

• The Status of the Storage Ring Design • The brillance spectrum• The studies to increase the user potential of the

machine

17.01.2013 Meeting on the Feasibility of X - Band Linac Band FEL Facility 2

Meeting on the Feasibility of X - Band Linac Band FEL Facility

3

The main goals of the design study

• 3 GeV electron beam energy is choosen• Low emittance for high brillance (e<1 nm rad) • Short circumference • Long lifetime• High dynamical aperture

17.01.2013


417.01.2013

General Layout

Stoarge Ring3 GeV

Booster Ring0.20-3 GeV

RF Gun2.6 MeV

Injector Linac2.6-200 MeV


5

Main Cell

• To reach low emittance four bending magnet structure is choosed.

• Deflection angle of the magnets are 5 degree and 2 m length

• 16 quadrupolle magnet are used.

• 4 type quadrupol magnet exist. (2 focusing 2 defccusing)

• 5 family of sextupols are placed along the maincell

17.01.2013


6

The storage ring

• The ring is constructed by the repetition of the main cell.

• The number of cell is 18• The length of 18 straight

section is 5 m• The circumference is 474 m• The emittance is 0.65 nm rad

17.01.2013


7

Magnet Parameters

17.01.2013

Indices Type Length (m) B. Angle (o) Quad. Str.(m-2) Sext. Str.(m-3)BD S. Bend. Mag. 2.00 5 QF1 Quadrupol 0.30 2.265 QF2 Quadrupol 0.30 1.495 QD1 Quadrupol 0.30 -1.861 QD2 Quadrupol 0.30 -0.809 SX1 Sextupoll 0.10 51.81SX2 Sextupoll 0.10 -58.74SX3 Sextupoll 0.10 -45.69SX4 Sextupoll 0.10 -100.42SX5 Sextupoll 0.10 118.35

Indices Type Length (m) B (T) B’ (T/m) B’’ (T/m2)BD S. Bend. Mag. 2.00 0.45 QF1 Quadrupol 0.30 22.65 QF2 Quadrupol 0.30 14.95 QD1 Quadrupol 0.30 -18.61 QD2 Quadrupol 0.30 -8.09 SX1 Sextupoll 0.10 518.1SX2 Sextupoll 0.10 -587.4SX3 Sextupoll 0.10 -456.9SX4 Sextupoll 0.10 -1000.2SX5 Sextupoll 0.10 1183.5


8

Dynamical Aperture

• Dynamic aperture is defined as the maximum phase space amplitude whith which particles do not get lost as a consequence of single particle-dynamic effects.

• It is needed to use tracking codes to simulate for the several turn of beam.

• ELEGANT code is used to define dynamical aperture.

17.01.2013


917.01.2013

Figure show the Dynamic aperture for different momentum offset (%-3, %-1, %0, %1, %3 and magnet error is zero, 1000 turn)

Figure 6. Fine dynamic aperture and lost particle coordinats (for 400 pass and 1000 macro particle)

Figure showDynamic aperture for different magnet error. (0.0, 1x10-4, 1x10-5 and momentum offset is zero 1000 turn)


10

Beam Lifetime

17.01.2013

Elastic Scattering: Elastic scattering is the lifetime limited by the Rutherford elastic residual gas scattering. And it’s formula is given as

The elastic scattering lifetime is 172 h .it is assumed that residual gas is CO with 0.1 nTorr pressure.

Inelastic Scattering :Inelastic scattering lifetime is limited by the deceleration and photon emission of electons due to interaction with residual gas atoms. The relation for inelastic lifetime scattering is

The inelastic scattering lifetime is 619 h. In the calculation it is assumed that residual gas is CO with 0.1 nTorr pressure.


11

Touschek Lifetime

17.01.2013

Touschek scattering describes a collision of two electrons inside a bunch with transfer of transverse momentum into longitudinal momentum. If the change of longitudinal momentum is more than momentum acceptance the beam will be lost. In a low emittance rings the current is limited by touschek lifetime.

The toushek Lifetime is calculated with OPA code.

Accordingly the life time


1217.01.2013

The lifetime is calculated for different rf voltage and for bunch charge values. The related calculations are illustrated in figure 1 and figure 2 respectively. The rf frequency is 500 MHz

Touschek Lifetimes vs. RF Voltage

Touschek Lifetime vs. Bunch Charge


13

RF Cavity Options

17.01.2013

100 MHz capacity loaded cavities:-Developed for MAX II and MAX III-Long bunch length and long Touschek lifetime-Low high Order Mode Instability

500 MHz SRF Module CESR Design-It is currently used in so many SR sources-SRF and Chrogenic systems will be familier technology by the TARLA experience


1417.01.2013

Comparision of the several options for MAX IV (Ref: MAX IV DDR)


15

Storage Ring Parameters

17.01.2013

Parameter ValueEnergy (GeV) 3Circumference (m) 474Beam Current (mA) 500 mABet. Tunes Qx/Qy 32.22/5.17Nat. Chromaticity x0x /x0y -89.3/-32.22Cor. Chromaticity x0x /x0y 0.0/0.0Energy loss / turn (keV) 312.6H. emittance (nm) 0.65V. emittance (nm) 0.0065Betaxmax (m) 21.10Betaymax (m) 27.2Betax in the mid. of straight sect. 18.0Betay in the mid. of straight sect. 9.8Dispx in the middle of straight sect. 0.097Number of straight section 18Length of straight section (m) 5Rf Voltage (MV) 3.5Harmonic number 760Max. Number of bunch 760Bunch charge (nC) 1.04 RMS Bunch length (mm) 2.24Momentum Acceptence (%) 4.5Coupling (%) 1Toushek Life time (h) OPA: 10.5El. Scat. Lifetime (h) 142Inel. Scat. Lifetime (h) 619Tot lifetime (h) 9.0

In case of 100 MHZ RF frequency

Rf Voltage (MV) 3.5

Harmonic number 158

Max. Number of bunch 158

Bunch charge (nC) 5

RMS Bunch length (mm) 4.90

Momentum Acceptence (%) 9.73

Touschek lifetime (h) 15.5


16

Synchrotron Radiation

17.01.2013

Synchrotron radiation properties is investigated for some Undulator types.

Undulator Bmax(T) Bmin(T) lu (mm) Length (m)

kmax gmin(mm) gmax(mm)

VU-20 0.98 20 1900 1.96 5 30

SU-15 1.5 15 1.5 2.10 8 25

In Vacuum undulator in Solleil Super conducting undulator for ANKA


1717.01.2013


18

User Potensial

One of the important issues is to define and improve the user potential of the Facility. For this Purpose:• In 28 October 2011 and in 6-7 October 2012, Light source user meeting

arranged with a high contributions.• Several international studies are supported.-Structural and Magnetic Characterization of Exchange Biased Co/CoO Multilayers, PETRA III, N. Akdoğan, GYTE. -Bent Laue optics for synchrotron biomedical research applications, Canadian Light Source, C. Karanfil, Muğla Üniversitesi. -A. Thaliana Heterotrimeric G-protein Complex, EMBL, Z. Sayers, Sabancı Üniversitesi. • In October 2013 third user meeting will be arranged.

17.01.2013


19

• After the LSUM 2011 and 2012• Light source user comity and light source user group are

constructed with many scientist from several university.• According to meetings the research potential collected to 5

main parts-Material Science-Characterization of nanomaterials-Structural analyses of biomolecules -Medical applications-Fundamental physics study for Physics and Chemistry

17.01.2013


2017.01.2013

The preliminary study of he properties for the beam line and experiments

22.11.2012 Çalıştay 2012, Dr. Z. Nergiz, Nigde Univ. 21

Ref: Nom Namkung IPAC2010 Presentation

TAC-SI

TAC-SI


22

Conclusion

• Very low emittance storage ring is designed with a relatively compact structure.

• The nonlinear effects are investigated.• It is shown that high brillance values can be

achived for some possible undulators.

17.01.2013


23

Thanks for your attentions

17.01.2013

AcknowledgmentThanks to H. Wiedemann for his supports and force to make better ring parameters.

Documents

TAC Synchrotron Radiation Project Dr. Zafer Nergiz Nigde University Science Faculty Physics Department