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AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 ASTRID2 – Status ESLS XX Berlin 2012 Niels Hertel ISA, Aarhus University, Denmark 1 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 ASTRID/ASTRID2 overview 2 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 Comparison ASTRID/ASTRID2 ASTRID ASTRID2 Energy 580MeV 580MeV Design current 200mA 200mA Injection From 100 MeV microtron once a day 580MeV from ASTRID Top-up every 3-4 minutes. Emittance 140nm 10nm Free straight sections 1 (2) 4 3 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 Radiation shielding Because of top-up operation and short lifetime we must shield the entire ring with a concrete wall. In addition, lead bricks are placed at critical points, and bags of lead pellets are used to pack closely around beam tubes etc. The bags each contain 2 kg. 5 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 Insertion devices for ASTRID2 1. 2. 3. ‘Old’ ASTRID undulator, Danfysik New W116 mm period, 2 T, 14 poles. Already delivered by Danfysik. New U53, 1.06 T, 87 poles, ordered from KYMA. Delivery Dec. 2012 6 AARHUS UNIVERSITET ASTRID2 Niels Hertel ASTRID2 lattice SD QF3 QF2 SF 19-20 Nov 2012 SD QF2 QF3 • DBA • 6-fold symmetry • Each period: • 2 combined function dipole magnets (+ pole-face winding) • 2 quadrupole families • 2 sextupole families • 4 H/2 V correctors • 4 BPM’s 7 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 Dipole chamber with pole-face windings Foils are used both for pole face windings and baking. They are insultated with 1 mm thick ceramic ’paper’ and Aluminum foil. 8 AARHUS UNIVERSITET ASTRID2 injection ASTRID Extr. Kicker septum ASTRID2 Niels Hertel 19-20 Nov 2012 ASTRID2: h=16, Trev=152ns ASTRID2 bumpers 1¼ turn extraction ASTRID: h=14, Trev=133ns ASTRID cycle time: 22.7 sec. septum AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 ASTRID 1¼ turn extraction Astrid 1¼ turn extraction 50 Bumpers on, Kicker on, 1 kick Bumpers on, Kicker on, 2 kicks Bumpers on, Kicker off 40 Position [mm] 30 20 10 0 -10 -20 S -30 0 C BL BL 5 10 15 20 25 C K 30 C BL BL 35 C S 40 Position in ring [m] 10 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 ASTRID 2 commissioning time line: • June 2011: First extracted beam from ASTRID into the first meters of transfer beamline. • March 2012: All of the transfer beamline and part of ASTRID 2 under vacuum. • May 2012: Beam through transfer beamline and part of ASTRID2 • July 2012: First turn in ASTRID2 • August 2012: Many turns in ASTRID2 • End of October 2012: RF cavity operational • 3 November 2012: First stored beam and first accumulation in ASTRID2 • Total running time with ASTRID2 until 1/11 2012: 7469 booster cycles: = 47 hours. •11 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 ASTRID extraction First beam in extraction beamline June 2011 Extraction Beamline: Fast Current Transformer Signal Background subtracted 12 10 Current [mA] 8 6 4 2 0 -2 -200 -150 -100 -50 0 50 Time (ns) 100 150 200 250 300 12 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 RF cavity The 105 MHz cavity (modified MAX IV design) was made by Research Instruments and was fitted with coupler and conditioned in Oct. 2012. The transmitter is a 8kW solid state unit from Tomco (Australia). 13 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 First stored and accumulated beam 3/11 2012 Beam current Vacuum Light ! 14 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 3/11 2012: Vacuum effects of 0.3 mA stored current Clearing electrodes are not yet in operation 15 AARHUS UNIVERSITET ASTRID2 Niels Hertel Diagnostics: 19-20 Nov 2012 • 3 sets of striplines, 1 ring electrode, 26 button pickups, 1 FCT and 1 DCCT • 3/11 2012: 10 bunches from ASTRID stored in ASTRID2 Stripline signal FCT signal 16 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 Video diagnostics • 13 Gigabit ethernet cameras are used for OTR screens and direct SR observation in both the ring and the transfer beamline • All cameras can be hardware triggered, and can deliver up to 100 frames/sec and down to 4 µsec exposure time. • Position and size analysis in realtime. 17 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 First beamline on ASTRID2 • The first beamline, UV1, has been moved into the ASTRID2 hall. • It has been provided with new optics, and is now waiting to be connected to a bending magnet port on ASTRID2. • This is expected to happen in January 2013 • All beamlines will be moved by the end of 2013 18 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 A problem… • After baking, we found that we had a leak in one of our undulator chambers. • The leak takes 15 minutes from He is applied to show a leak rate of ~2e-8 mbar*l/sec. • We have so far been unable to find the precise location of the leak, or to repair it with VacSeal 19 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 Commissioning: Next steps • Apply clearing voltage • Optimise transfer beamline and injection • Adjust tunes • Position the beam • Scrubbing…….. • In 2013 we alternate between one ASTRID 2 week and two ASTRID weeks. 20 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 www.isa.au.dk 21 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 22 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 ASTRID2 Vacuum • Each dipole chamber has › one 150 l/s ion pump with integrated TSP › All interconnecting tubes (Ø38mm) are NEG coated • Insertion straights › ID chambers are NEG coated • Bake out: In-situ › Dipole chambers: ~170°C › Interconnecting tubes (NEG): ~200°C › Heating: Thin (<0.5 mm) heating foil (Soleil) › Isolation: Thin (~1 mm) ceramic “paper” 23 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 Home-built power supplies • For correctors and pole-face windings we need many (~80) bipolar power supplies. • These have been home-built using a modular system with 28 supplies in one rack. • All supplies are ±20V, 15A. • All control is via ethernet. 24 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 25 AARHUS UNIVERSITET ASTRID2 Niels Hertel 19-20 Nov 2012 26