15 december 20081 atf2 high availability dc magnet power supplies – commissioning status by: paul...
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15 December 2008 1
ATF2 High Availability DC Magnet Power Supplies – Commissioning Status
By: Paul Bellomo, Antonio de Lira,
Briant Lam* and David MacNair
15 December 2008 2
Topics
• Nov 2008 Commissioning– AC Installation– Hardware Check Out– Notes on Magnets
• SF1 and SD0• SF5• 10 PPM Magnets
15 December 2008 3
AC Installation
• Previous AC installation did not provide neutral for the bulk power supplies.
• New delta-wye transformer was installed.
15 December 2008 4
Hardware Checkout
• FF Magnets– All magnet electrical connections were
covered– Thermal switches verified– Flow switches verified
• With the exception of the ones that use an old flow switch that does not work. These have a jumper installed.
– Magnetic Polarities verified– EPICS control verified
15 December 2008 5
SF1 and SD0
• Final Doublet Sextupoles– Solid wire magnets that run at 8A and
standardize to 12A.– The 50A power supplies are limited to 12.5A
in hardware, by placing 12 turns through the 150A DCCT.
– A software limit of 12A was placed in EPICS.
15 December 2008 6
SF5 StabilityStability SF5 (2A Full Scale)
-300
-200
-100
0
100
200
300
0 500 1000 1500 2000 2500 3000 3500 4000
Time (s)
Err
or
(pp
m)
SF5
• SF5– Plans to run this magnet at 1.5A from a 50A power supply– Increase the number of turns through the 150A DCCT from 3 to 6 to increase the
readback signal, which also limits the maximum current to 25A.– Measured stability at 1.5A, assuming a 2A full scale, to be +/- 200 ppm– The requirement is 1900 ppm
15 December 2008 7
10 ppm Magnets
Stability QD10 (50A Full Scale)
-20
-15
-10
-5
0
5
10
15
20
0 500 1000 1500 2000 2500 3000 3500 4000
Time (s)
Err
or
(pp
m)
QD10B
QD10A
15 December 2008 8
10 ppm Magnets
Stability QD4 (50A Full Scale)
-20
-15
-10
-5
0
5
10
15
20
0 500 1000 1500 2000 2500 3000 3500 4000
Time (s)
Err
or
(pp
m)
QD4B
QD4A
15 December 2008 9
10 ppm Magnets
Stability Final Doublet Quads (200A Full Scale)
-20
-15
-10
-5
0
5
10
15
20
0 500 1000 1500 2000 2500 3000 3500 4000
Time (s)
Err
or
(pp
m)
QD0
QF1
15 December 2008 10
10 ppm Magnets
Stability Bends (200A Full Scale)
-20
-15
-10
-5
0
5
10
15
20
0 500 1000 1500 2000 2500 3000 3500 4000
Time (s)
Err
or
(pp
m)
B1
B2
B5
15 December 2008 11
Summary
• The power supplies are commissioned and ready for operation.
• Configuration data and documentation of the systems can be found here:– www.slac.stanford.edu/~bri– http://confluence.slac.stanford.edu/display/AT
F/ATF2