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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
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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
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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.
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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
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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
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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.
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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
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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).
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AARHUS
UNIVERSITET
ASTRID2
Niels Hertel
19-20 Nov 2012
First stored and accumulated
beam 3/11 2012
Beam current
Vacuum
Light !
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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
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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
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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.
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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
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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
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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.
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AARHUS
UNIVERSITET
ASTRID2
Niels Hertel
19-20 Nov 2012
www.isa.au.dk
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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”
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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.
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AARHUS
UNIVERSITET
ASTRID2
Niels Hertel
19-20 Nov 2012
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AARHUS
UNIVERSITET
ASTRID2
Niels Hertel
19-20 Nov 2012
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