Study on the high brilliance operation mode of HLS

1
Study on the high brilliance operation mode of HLS

• Student He Zhang
• Major Nuclear technology and
  application
• Supervisor Duohui He, Professor
• Lin Wang, Associate
  Professor

2

• Introduction of HLS and the principles of high
  brilliance mode lattice design
• Design of HLS high brilliance mode
• The effects of ID in high brilliance mode

3
Introduction of HLS and the principles of high
brilliance mode lattice design
4

1. Introduction of HLS

5

• General Purpose Light Source(GPLS)Lattice

• Quadruple strength
• coefficient K
• Q1 K1 1.5692
• Q2 K1-0.9557
• Q3 K1-2.2671
• Q4 K1 3.0708
• Q5 K1 3.0708
• Q6 K1 -2.2671
• Q7 K1 -0.9557
• Q8 K1 1.5692
• Tunes
• ?x 3.58
• ?y 2.58
• Emittance
• Emit 166 nmrad

6
The old High Brilliance Light Scource (HBLS)

• Quadruple strength
• coefficient K
• Q1 K1 2.494447
• Q2 K1-2.526518
• Q3 K1 3.820103
• Q4 K1-0.747670
• Q5 K1-3.107723
• Q6 K1 4.821645
• Q7 K1 4.633252
• Q8 K1-2.765640
• Tunes
• ?x 5.8213
• ?y 2.3254
• Emittance
• Emit 26.87 nmrad

7

• Tunes on the super periodic structure
• resonance graph

• Change of ßfunction VS. change of K

8
Characters of HBLS and the design purpose of new
lattices

• HBLS

• New Lattices

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HLS new high brilliance lattice design
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Searching for 4-folded lattices with achromatic
straight sections

• Limits of 4 folded lattices with achromatic
  straight sections

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• K of Q3 VS. K of Q4

• Emittance e VS. K of Q3

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• ßx changes between 15m,35m, ßy changes between
  3m,9m ,distribution
• of Ks of Q3 in all periodic solutions

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• conclutions

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New 2-folded lattice design

• 2 folded Lattice L2

• Qudruple strength
• coefficient K
• Q1 K1 2.5808
• Q2 K1-2.2038
• Q3 K1 3.9596
• Q4 K1-2.1481
• Q5 K1 2.7563
• Q6 K1 0
• Q7 K1-2.7457
• Q8 K1 2.3722
• Tunes
• ?x 4.449
• ?y 2.425
• Emittance
• Emit 55.94 nmrad

15

• Tunes of L2

• Super periodic structure
• resonance graph

• Change of ßVS. Change of K

16

• Change of tunes VS.
• momentum dispersion

• Change of tunes VS. initial
• horizontal position

• Change of tunes VS. initial
• vertical position

17

• Dynamic aperture of L2

18

• FMA

19

• Position of correctors and BPMs

20
Error amplifier of L2
21

• Simulation results of close orbit distortion
  correction of L2

22

• Simulation results of close orbit distortion
  correction of L2

23

• Simulation results of close orbit distortion
  correction of L2

24

• An example of close orbit distortion correction
  of L2

• An example of close orbit distortion correction
  of L2

25

• An example of close orbit distortion correction
  of L2

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• Dynamic aperture of L2 with errors

• Brilliance at the midpoints of dipoles

27
New 4-folded lattice design with chromatic
straight sections

• New 4-folded lattice design with chromatic
  straight sections

L1 L2 L3
Q1 (/m2) 2.7496 2.6790 2.6148
Q2 (/m2) -2.8876 -2.7968 -2.7004
Q3 (/m2) 3.7620 4.0591 4.2914
Q4 (/m2) -1.1581 -1.5225 -1.7782
Emittance (nmrad) 42.33 25.71 16.15
Tunes (5.197, 2.528) (5.205, 2.545) (5.207, 2.535)
Momentum compacter 0.0205 0.0168 0.0134
Nature chromaticity (-13.53, -11,80) (-16.02, -8.65) (-18.32, -6.98)
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• ß function and ? function of new 4-folded lattice

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• Tunes

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• Super periodic structure resonance graph

31

• Change of ßVS. Change of K

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• Change of tunes VS. change of momentum
• dispersion (L4-3)

-0.18 lt dp/p lt 0.22
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• L4-3 Change of tunes VS. initial position

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• Dynamic aperture of L4-3

35

• FMA

36

• Error amplifier of L4-3

37

• Simulation of close orbit distortion correction
  of L4-3

38

• Simulation of close orbit distortion correction
  of L4-3

39

• Simulation of close orbit distortion correction
  of L4-3

40

• An example of close orbit distortion correction
  of L4-3

41

• An example of close orbit distortion correction
  of L4-3

42

• Dynamic aperture with errors of L4-3

• Brilliance at the midpoint of dipoles (L4-3)

43

• Commissioning (2005.10.1-2005.10.7)

• Lattice of commissioning

• ßfunction

Maximal injection beam curent is 13.3mA, after
ramping 7.4mA remains?
44

• Possible reasons why beam current cant
  accumulate in injection progress

45

• Conclusions

46

• Beam lifetime of L4-3

47

• Beam lifetime of L4-3

Physical acceptanceHx22.2mm-mrad, Hy44.3mm-mrad
48

• ??L4-3?????

• Lifetime VS. physical acceptance

• Lifetime VS. gas pressure

49

• Beam lifetime of L4-3

• Lifetime VS. gas pressure

• Lifetime VS. momentum acceptance

50

• Beam lifetime of L4-3

• Lifetime VS. gas pressure

51

• Beam lifetime of L4-3

• Touschek lifetime at different position

52

• Beam lifetime of L4-3

• Lifetime VS. momentum acceptance

• Lifetime VS. RF Voltage

53

• Beam lifetime of L4-3

• Lifetime VS. coupling rate

• Lifetime VS. beam bunch length

54

• Beam lifetime of L4-3

Lifetime VS. beam current
55

• Conclusions

56
Effects of Insertion Devices
57

• The undulator in HLS

• Magnetic field of the undulator

• The undulators design parameters

58

• Fiting of the undulators magnetic field

59

• Fitting result of the periodic magnetic field

• Fitting result of the fringe magnetic field

60

• Linear effect of the undulator

• 4-D transfer matrix of the undulator

61

• Change of tunes

• Change of ßfunction

62

• Change of close orbit

63

• Change of dynamic aperture

64

• Nonlinear effects of the undulator

• Symplectic integration

• Generating function method

The second kind of GF
Relations of pxi, pyi, qxf, qyf
Get the parameters by least-squares procedure
65

• Tracking result of SI and GF

66

• Tracking result of SI and GF

67

• Tracking result of SI and GF

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• Tracking result of SI and GF

69

• FMA

70

• Effects on storage ring parameters of the
  undulator

Energy loss in the undulator per turn
Change of emittance and energy spread
71

• The super conducting wiggler in HLS

• Magnetic field in the mid plane of the wiggler

72

• Hard edge model of the wiggler

73

• Linear effect of the wiggler

• Change of ßfunction

• Change of tunes

74

• Local compensation

• Change of ß function after compensation

• Change of tunes after compensation

75

• Global compensation

• Change of ßfunction after global compensation

• Change of tunes after global compensation

76

• Global compensation

• Change of dynamic aperture after global
  compensation

77

• Global compensation

• Change of storage ring parameters after global
  compensation

78

• Conclusions

79
Conclusions and future work
80

• Conclusions

81

• Future work

82
Acknowledgements
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• THANKS!