Iranian Light Source Facility (ILSF) Project
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1 Iranian Light Source Facility (ILSF) Project Hossein Ghasem On behalf of ILSF technical staff School of Particles and Accelerators, IPM
2 Iranian users requirements Source Energy range Photon Flux Spot size Especial Resolution (ev) (p/s) (µm) requirements 1 Powder Diffraction BM 6-30 k V 100 H 2 Single Crystal X-ray Diffraction In Vac k for small molecules Und. 3 X-ray Reflectivity(tomography) In Vac.Und k EXAFS Wiggler 3-40 k Few mm 5 XRF BM 5-30 k 10 ev 6 Inelastic X-ray Scattering In Vac.Und k 10 8 < 5 mev 100 V 100 H High resolution Backscattering 7 Gas phase photoemission E. M (XPS,,ARPES) Und. 8 Solid State Electron Spectroscopy E. M Und. 9 Spectromicroscopy SPEM Hel >8000 few mm (+ARPES) Und. PEEM (+ XMCD) 10 Medical Applications(MRT, DEI, ) Wiggler K mm 2 11 SAXS Wiggler 5, 8, 16 K mm 2 12 Macromolecular Crystallography Wiggler 3-25 K 13 Optics BM White 10 cm horizontal 14 Teaching Beamline BM 15 IR BM 16 UV-Vis BM 2
3 ILSF design objectives High brilliance photons/s/mm 2 /mrad 2 /0.1%( ω/ω) High photon flux density High current 400 maor >400 ma Low emittance (less than 5 nm-rad) Beam lifetime > 10 h Low beam cross section 160 μm/7 μm Large number of straight sections for Insertion Devices 3
4 The following parameters of the machine are determining these performances: Photon energy (γ Photon E 2 ) Emittance and beam current (Br I/ε 2 ) o Current (I) RF system o Emittance (ε) Lattice optimization (ε E 2 φ 3 ) Small emittance almost means optimized lattice Circumference of the machine o The circumference of the accelerator determines the budget. o In rough numbers one could estimate that 1 m of circumference means a cost of 0.8 Mill. Euros. RF system, Vacuum, feedback system, etc. 4
5 General overview of ILSF accelerator design Technical Building: Width = 15.0 m Length = m Exp. hall Service area 3 GeV Booster 96.4 m 130 m BTS Office Building Width = 30 m Length = 60 m 3 Floors 190 m LTB 150 MeV Linac Service area Length of beamline 40 m Front end 9 m Exp. hall Corridor for walking, (3.5 m) m
6 ILSF storage ring-lattice There are two main candidates for the storage ring lattice of intermediate energy ILSF. They have been called as ILSF-Lattice-1 and ILSF-Lattice-2. The circumference of storage ring for both candidates is m. ILSF-Lattice-1 4 super-period DB structures 90 degrees bending per period Reserved spaces with different length for the IDs and injection equipments 0 ILSF-Lattice-2 22 super-period DB structures 16.4 degrees bending per period Reserved spaces with the same length as 4.8 m for all straight sections Y[m] -20 Y[m] X[m] X[m] NOTE: This presentation is only focused on the ILSF-Lattice-1 as the main candidate of storage ring lattice. 6
7 ILSF storage ring-straight sections Dipole magnet Quadrupole magnet Sextupole magnet Long straight section Medium straight section Short straight section Diagnostics Energy = 3 GeV Circumference = m Current = 400 ma Symmetry = 4 Number/Length of long s.s. = 4/7.88 m Number/Length of medium s.s. = 16/4 m Number/Length of short s.s. = 12/2.82 m Emittance =3.278 nm-rad Nat. Radiation loss/turn =1.016 MeV Tot. Radiation loss/turn =1.5 MeV Beam size at medium s.s. (σ x /σ y ) =156.18/6.84 μm RF system 3 GeVILSF Storage Ring RF system Injection RF system The percentage of the storage ring is 43.46% while is very good in comparison with other light sources m 7
8 ILSF booster-lattice Inj. Energy = 0.15 GeV Ext. Energy = 3 GeV Circumference = 192 m Current = 10 ma Symmetry = 4 Number/Length of long s.s. = 4/4.5 m Emittance =32.4 nm-rad Nat. Radiation loss/turn =0.78 MeV 59 m 96 m 8
9 BTS transfer line The beam within Booster To Storage (BTS) ring Transfer Line must be deflected 45 degrees. Extraction septum (- 5 degrees), Injection septum (9 degrees) The deflection angle of other bending magnets in the BTS line has to be 41degrees. Having 5 bending with a positive The angle Booster and 2 to with Storage negative Ring one. Transfer Thus Line the deflection angle of each magnet should be degrees. 5 degrees booster extraction septum degrees bending magnets Quadrupole magnets degrees bending magnets 9 degrees storage ring injection septum X[m]
10 LTB transfer line The LinacTo Booster (LTB) transfer line starts at the exit of the Linac and finished at the injection point of the booster synchrotron. The transfer line exit of two bending magnets and the septum at the end degrees injection angle LTB Transfer Line Diagnostic Line 2 m 4 m 6 m 8 m 10 m 12 m 14 m 16 m 18 m 13.0 degrees deflection angle 150 MeV Linac 27.0 degrees deflection angle 24.0 degrees deflection angle 10 Not well optimized yet
11 ILSF storage ring-magnets Each super-period is composed two matching cells that are at beginning and at the end of a super-period and three unit cells are locating between the matching cells. 1 2 Bx = B0 + xb' + x B" K = M = B' = B R 0 2 B" B"(T/m ) = 0.3 B R E(GeV) 0 B'(T/m) 0.3 E(GeV) 4super-period Matching cell+ 3Unit cells+ Matching cell 8 dipole per super-period 9 families of quadrupoles 9 families of sextupoles Total magnets: o 32 dipoles o 104 quadrupoles o 128 sextupoles Unit cells Matching cells 11
12 ILSF storage ring-magnets 1- Dipoles Parameters of dipoles Unit Value Magnetic field T Length m Deflecting angle Deg Bending radius m Magnetic field gradient (M./U.) T/m / K (M./U.) m / g=3.837 Alba g=5.839 Y [mm] X [mm]
13 ILSF storage ring-magnets 2- Quadrupoles QUAD. Length (m) K (m -2 ) Gradient (T/m) B pole (T) QF QF QF QF QF QD QD QD QD db'/b' X [cm]
14 ILSF storage ring-magnets 3- Sextupoles SEXT. Length (m) M (m -3 ) B" (T/m 2 ) B pole (T) SF SF SF SF SD SD SD SD SD
15 ILSF storage ring-girders Further dynamic alignment requirements Easy and safe operation Dipole, quadruple and sextuple magnets are mounted on a girder 8 girders of matching cell type 24 girders of unit cell type 32 girders overall Beam Height 1.4 m Girder Height 1 m 15
16 ILSF storage ring-girders Static Analysis Total Static deformation Static-Thermal Analysis Static-Thermal deformation of the ILSF magnet girder assembly in vertical direction (Temperature variation: C (upper limit)) Modal Analysis First mode shape, rolling, ω 1 = 62.1 Hz 16
17 ILSF storage ring-vacuum Design objectives Average pressure : 1x10-9 mbar Beam life time> 10 hours lowest influence of residual gasses in circulated beam Absorbing the unused part of radiation safely flexible for upgrading and other future changes Reasonable cost 17
18 ILSF storage ring-vacuum matching cell unit cell 18
19 ILSF storage ring-vacuum 19
20 ILSF storage ring-rf system RF frequency is 500MHz duo to: dth = 15.0 m ngth = m, Short pulses (bunch length) requirements Laboratories Experimental hall Laboratories Availability of HOM damped cavity cost Storage Ring RF Plants (Each: 2 cavities + 2 RF Tx with 4towers SSA) Service area 3 GeV Booster Booster RF Plant (1 cavity + 1 RF Tx with 1 tower SSA) BTS-TL LTB-TL Linac 150 MeV Linac 2 options (3.6/3.9MV)for RF Voltage are assumed. Service area Desired RF acceptance of more than 3%. Sufficient Touschek life time (about 20hours) Laboratories Experimental hall Laboratories Corridor m) RF Lab 20
21 ILSF storage ring-rf system RF plant possible configuration 21
22 ILSF site selection 22
23 ILSF site selection 7 sites around Qazvin- North & Northeast of Qazvin Site No. Site 1 Site 2 Site 3 Site 4 Site 5 Site 6 Site 7 PGA (g)
24 ILSF site selection 4 sites around Esfahan- Esfahan University, Es. Te. Un. & Esfahan science and Technology Town 24
25 ILSF building Booster Tunnel Crane 12 m Bridge Open Area Service Area Experim. Hall Laboratories 20 m 48.2 m Corridor for walking, (2.0 m) Storage ring Tunnel Corridor for walking, (3.5 m) 65 m 82 m 25
26 ILSF building-1 st alternative 26
27 ILSF building-2 nd alternative 27
28 Design alternatives Some alternatives for lattice of ILSF storage ring Leng gth of s.s. (m) 12 S O LE IL S S R F N S LS -II ALBA D IAM O N D T P S ILS F 10 ILS F -R E C E N T N O. 28
29 Some alternatives for ILSF storage ring ILSF-CDR Circumference (m) Symmetry 4 Field (T) 1.42 Emittance (nm-rad) 3.27 Bending angle (Deg.) Long ss. (m) 4 x 7.88 m Medium ss. (m) 16 x 4 m Short ss.(m) 12 x 2.82 m Percentage (%) x 7.88 m 16x5.88 m x 10 m 16x 6.5 m x 9 m 18 x 6.4 m x 10 m 20 x 6.8 m x 9.5 m 24 x 6 m x 12 m 21 x 7m x 10 m 24 x 7 m GeV ALBA x 8 m 12 x 4.5 m GeV SOLEIL x 12 m 12 x 7 m 8 x 3.8 m GeV SSRF x 12 m 16 x 6.5 m GeV DIAMOND x 8 m 18 x 5 m GeVTPS x 12 m 18 x 7 m
30 THE END 30
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