FFAG for next Light Source.


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A.G. Ruggiero - Brookhaven National Laboratory. 4/18. The accompanying ... A.G. Ruggiero - Brookhaven National Laboratory. 6/18. Contemplations of FFAG ...
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Slide 1

FFAG for next Light Source Alessandro G. Ruggiero Light Source Workshop January 24-26, 2007

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Components: 10 mA - 3 GeV Brilliance - > Source + Lattice Properties Source 3 GeV SC Linac Storage Ring FEL  n = 1 π mm-mrad  ~ 0.1 π nm Source 240 MeV Linac 3 GeV RCS Storage Ring FEL Damping Time + Quantum Fluctuation A.G. Ruggiero - Brookhaven National Laboratory

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FFAG Rings for Acceleration and Storage Source 240 MeV 0.24 - 0.56 GeV 0.56 - 1.3 GeV 1.3 - 3 GeV SR FEL Linac FFAG\'s Synchrotron Radiation is from Ring Bending. Shaft Brilliance is resolved initially by the Source The Ring Lattice can just diminishing the Brilliance Quantum Fluctuation makes the Brilliance significantly littler. The objective is to minimize speeding up and capacity time so that the Beam spends in FFAG\'s a timeframe littler than the Damping Time. FFAG\'s have huge Momentum and Betatron Acceptance. What\'s more, are DC! Vitality Recovery A.G. Ruggiero - Brookhaven National Laboratory

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An Example of FFAG SR Facility The accompanying is only a sample! A genuine task can be effectively downsized from this in any case. The SR Facility is made of 3 Rings having the same perimeter and structure. They are all situated in the same passage, either on top of each other, or one next to the other in a concentric manner. FFAG-1 FFAG-2 FFAG-3 Linac A.G. Ruggiero - Brookhaven National Laboratory

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FFAG (1) F ixed-F ield A lternating-G radient ( FFAG ) Accelerators have the great element that the magnets are not sloped as in a Synchrotron, but rather are kept at consistent field amid the increasing speed cycle ( Cyclotrons ). The pillar is infused on an internal circle, it spirals to the outside as it is quickened, and it is extricated from an external circle. Along these lines the shaft can be quickened quick, the impediment being set not by the magnets but rather by the RF framework. On a basic level it might likewise be conceivable to quicken a consistent pillar. Amid the speeding up cycle the pillar can be halted at any transitional vitality and the cycle exchanged into a capacity mode. Every one of the FFAG rings is a persistent SR source. SR can likewise be removed amid the quickening however the size and the purpose of source will fluctuate radially with vitality. A.G. Ruggiero - Brookhaven National Laboratory

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Considerations of FFAG FFAG quickening agents are an old innovation proposed and showed around an a large portion of a century back. They have regularly been proposed particularly in association of Spallation Neutron Sources. Be that as it may, regardless of a lot of outline and attainability concentrates on, they were never effectively supported by established researchers, since they were seen with an excessively complex circle flow, a too huge energy gap required for speeding up, and hence excessively costly magnets. RF increasing speed was additionally viewed as dangerous over such a substantial energy gap. Additionally, the FFAG quickening agent was constantly coupled to the need of a generally huge infusion vitality (of couple of hundred MeV) toward one side, and the need of stacking/collecting gadget at the flip side of the quickening cycle. As of late, there is a reestablished enthusiasm for FFAG quickening agents, above all else in view of the handy exhibit of a 150-MeV proton quickening agent at KEK, Japan, and also due to a more cutting edge way to deal with shaft flow and magnet grid plan, and of some vital inventive thoughts concerning energy compaction and magnet measurements. In light of these later improvement, FFAG quickening agents are in a matter of seconds an exceptionally engaging and aggressive innovation that can permit a bar execution at the same level of the other quickening agent designs. FFAG Accelerators have additionally been widely examined as could be expected under the circumstances stockpiling and quickening agents of extraordinary light emissions and Electrons in the few GeV vitality range A.G. Ruggiero - Brookhaven National Laboratory

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FFAG Lattice Choices Scaling Lattice (KEK) Alternating Field Profile picked so that all directions have same optical parameters, free of molecule energy (zero outspread chromaticity) accomplished with B = B 0 (r/r 0 ) –n But huge Physical gap to suit substantial force range (±30-half). Vast bowing field. Constrained insertions. Vitality restriction. Costly. It favors DFD triplet. Non-Scaling Lattice (Muon Collaboration) Alternating Linear Field Profile. Extensive variety of optic parameters over required force range (Large Chromaticity). In any case, reduced Physical Aperture. Huge Insertions. Lower attractive fields. It inclines toward FDF triplets. Huge energies conceivable. Anticipated that would be less expensive. Scaling cross section has been shown in Japan. Non-Scaling Lattice needs functional show. Electron Models. EMMA and SBIR. A.G. Ruggiero - Brookhaven National Laboratory

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FDF Triplet The FFAG we propose here is a Radial-Sector FFAG with Non-Scaling Lattice, made of an unbroken arrangement of FDF triplet where magnets are isolated by short and long floats. The field in the magnets has a direct profile, as the magnets are hilter kilter quadrupole along the side uprooted from each other and from the reference circle to be the infusion vitality. F D F S/2 S/2 Extraction Injection g Most of the bowing is done in the focal D-magnet. There is a minor converse twist in the F-Magnets. The magnet setup and cross section are identiacal in the 3 rings. Every ring can acknowledge a vitality spread as extensive as ±40% measured from the focal vitality. A.G. Ruggiero - Brookhaven National Laboratory

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Staging FFAG-1 FFAG-2 FFAG-3 Inj. Vitality, MeV 240 560 1300 Top Energy, MeV 560 1300 3000  E/E, ±% 39.95 39.76 39.53 The venture can be effectively arranged Phase 1 240 MeV Linac + FEL-1 Phase 2 add FFAG-1 to 0.56 GeV + FEL-2 Phase 3 add FFAG-2 to 1.3 GeV + FEL-3 Phase 4 add FFAG-3 to 3.0 GeV + FEL-4 No requirement for extra Storage Ring as every ring can be worked all things considered at any vitality, for case toward the end A.G. Ruggiero - Brookhaven National Laboratory

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Geometry & Field Profiles Same for every one of the 3 Rings Injection Top Circumference, m 807.091 807.717 No. of Periods 136 Period Length, m 5.9345 5.9392 Arc Length F-division, m 0.7 0.697 Arc Length D-segment, m 1.4 1.409 Short Drift, g, m 0.3 Long Drift, S, m 2.5 FFAG-1 FFAG-2 FFAG-3 kG cm A.G. Ruggiero - Brookhaven National Laboratory

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Radial Aperture - Lattice Functions x, cm s, m A.G. Ruggiero - Brookhaven National Laboratory

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Betatron Tunes - Compaction Factor Circumference Diff. ΔC in cm versus Force Deviation δ  c - 9.0x10 - 5 - 6.0x10 - 4 H - rad, m 8.24x10 - 3 - 4.95x10 - 2 A.G. Ruggiero - Brookhaven National Laboratory

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Diagnostic & Steering Boxes Flanges & Bellows D-Sector Magnet 20 cm Top View Vacuum Pump F-Sector Magnets Diagnostic & Steering Boxes Flanges & Bellows D-Sector Magnet 10 cm Side View Diagnostic & Steering Boxes Vacuum Pump F-Sector Magnets D-Sector Magnet RF Cavity Vacuum Pump F-Sector Magnets Period Layout (136 Cells) 6.0 m 50-100 k$ 300-600 k$ A.G. Ruggiero - Brookhaven National Laboratory

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F and D Arrangement F D F G > 0 G < 0 B > 0 B < 0 Inj. Ejec. B < 4 kG A.G. Ruggiero - Brookhaven National Laboratory

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Acceleration Harmonic Number 1350 Number of Bunches 675 Total Number of e 10 13 e/Bunch 1.5 x 10 (2.4 nC) Average Current 0.65 Amp RF Frequency 501.454 - > 501.053 MHz Rev. Frequency 0.371 MHz Rev. Period 2.69 µs RF Phase 60 o V crest 1.0 2.3 5.5 MVolt Acceleration Period 1 ms Number of Revolutions 370 A.G. Ruggiero - Brookhaven National Laboratory

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Radiation Performance A.G. Ruggiero - Brookhaven National Laboratory

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FFAG-3 as Storage Ring at 3 GeV The Storage Period 4 ms is littler than Damping Time 9.5 ms No Quantum Fluctuation Effects !! Exploit the low emittance of a decent e-source  source ~ 0.1 nm Acceleration 1 ms Storage 4 ms (5 ms) Rep Rate 200 Hz Duty Cycle 80% Or use SR for 100% d.c. Vitality Recovery That requires deceleration possibly in the same FFAG rings A.G. Ruggiero - Brookhaven National Laboratory

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1-GeV e-SCL 10-GeV e-SCL ER 10-GeV ASR Source ER RHIC eRHIC: 10-GeV e x 250-GeV p or 100-GeV/u Au 1-GeV e-SCL 10-GeV FFAG\'s (+ SR) Source ER RHIC A.G. Ruggiero - Brookhaven National Laboratory

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