hghg calculation for flash2 · 0.2 0.4 0.6 0.8 1.0 1.2 1.4 q=1.0nc current profile [ka] energy...
TRANSCRIPT
HGHG calculation for FLASH2
Guangyao Feng
S2E Meeting
DESY
17.03.2014
Radiation calculation for FLASH2 HGHG
𝜆𝑢 = 6.5 cm
L = 0.65m
Modulator 1
Dispersive Chicane
Radiator 1 Seed Laser
Electron Beam
λ λ λ/k
𝜆𝑢 = 3.14 cm
L = 5.56 m
λ = 233 nm λ/7 = 33.3 nm
0.00000 0.00002 0.00004 0.00006 0.00008 0.000100.0
2.0x108
4.0x108
6.0x108
8.0x108
1.0x109
1.2x109
1.4x109
1.6x109
Inp
ut p
ow
er
of th
e r
ad
iatio
n fie
ld [W
]
z [m]
Seed Laser Chicane defined in Genesis input file
trama= 1
itram11= -0.9924
itram12= -0.0037
itram13= 0.000000D+00 . . . itram66= 1.000000D+00
Radiation calculation for FLASH2 HGHG
Modulator and Chicane + Radiator are calculated separately
with Genesis 1.3
Modulator 1 Dispersive Chicane
Radiator 1
Modulator run 1. Integrating through
modulator with a seed.
2. Dumping particle
distribution
$newrun
nbins = 32
nharm = 7
npart = 56448
Idmppar = 1
outputfile='modulator.out'
Chicane + Radiator run 1. Importing particle distribution.
2. Up converting the particle distribution to a higher
harmonic.
3. Tracking through the dispersive chicane.
4. Integrating through the radiator.
$newrun
partfile='modulator.out.dpa‚
convharm= 7
Radiation calculation for FLASH2 HGHG (Q=0.5nC)
Beam properties at the
entrance of undulator for
0.5nC
-80 -60 -40 -20 0 20 40 60 80
0.1
0.2
0.3
0.4
0.5
0.6
0.7
E=100keV
I=0.5kA
Q=0.5nC
Current profile [kA/2]
Energy spread within 10 m slice [MeV]
Energy spread within 15 m slice [MeV]
Cu
rre
nt &
Ene
rgy
spre
ad
s [m]
5% bad particles are removed Energy spread within 15μm and 10μm slice length
Radiation calculation for FLASH2 HGHG (Q=0.5nC)
CASE 1: With particle distribution file genereted
from ASTRA simulation
CASE 2: Using beam parameters definition in
Genesis main input file
𝝈𝒔 = 𝟖𝟎 𝛍𝐦
Gaussian distribution Current profile
Initial energy
distribution
Initial slice
energy spread 𝝈𝜸 = 𝟎. 𝟒
no energy chirp
After the modulator (CASE 1)
Energy modulation and microbunching (CASE 1)
After the Modulator After the Chicane
Radiation calculation for FLASH2 HGHG (Q=0.5nC)
Radiator, CASE 1 Radiator, CASE 2
Saturation power
Saturation length
0 20 40 60 80 100 1200.0
2.0x108
4.0x108
6.0x108
8.0x108
1.0x109
1.2x109
1.4x109
1.6x109
1.8x109
Psa
t [W
]
s [m]
0 20 40 60 80 100 120
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Lsat [
m]
s [m]
0 20 40 60 80 100 1200.0
2.0x108
4.0x108
6.0x108
8.0x108
1.0x109
1.2x109
1.4x109
s [m]
Psa
t [W
]
0 20 40 60 80 100 120
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Lsat [
m]
s [m]
Radiation calculation for FLASH2 HGHG (Q=0.5nC)
Radiation energy
31 32 33 34 35 360
1x104
2x104
3x104
4x104
5x104
P(
) [a
.u.]
[nm]
0 1 2 3 4 5 60.01
0.1
1
10
Ra
dia
tio
n e
ne
rgy [
J]
z [m]
Q= 0.5 nC
Radiator1
Radiator, CASE 1 Radiator, CASE 2
Spectrum
31 32 33 34 35 360.0
5.0x103
1.0x104
1.5x104
2.0x104
2.5x104
3.0x104
3.5x104
[nm]
P(
) [a
.u.]
0 1 2 3 4 5 60.01
0.1
1
10
Q= 0.5 nC
Radiator1
Ra
dia
tio
n e
ne
rgy [
J]
z [m] Eend=31μJ Eend=26μJ
0 20 40 60 80 100 120
0.0
2.0x108
4.0x108
6.0x108
8.0x108
1.0x109
1.2x109
1.4x109
1.6x109
P [
W]
s [m]
0 20 40 60 80 100 1200.0
2.0x108
4.0x108
6.0x108
8.0x108
1.0x109
1.2x109
1.4x109
P [
W]
s [m]
Power distribution along the bunch
At the exit of radiator
CASE 1
CASE 2
-40 -20 0 20 40
0.1
0.2
0.3
0.4
0.5
0.6
0.7 Q=0.25nC
Current profile [kA/2]
Energy spread within 10 m slice [MeV]
Energy spread within 15 m slice [MeV]
E=100keV
I=0.5kA
C
urr
en
t &
En
erg
y s
pre
ad
s [m]
𝜀𝑥𝑝𝑟𝑜𝑗 = 0.63𝜇𝑚 ∙ 𝑟𝑎𝑑, 𝜀𝑦
𝑝𝑟𝑜𝑗 = 0.62𝜇𝑚 ∙ 𝑟𝑎𝑑
5% bad particles are removed
Slice energy spread distribution (uncorrelated)
Energy spread within 15μm and 10μm
slice length
Radiation calculation for FLASH2 HGHG (Q=0.25nC)
Radiation calculation for FLASH2 HGHG (Q=0.25nC)
After the modulator
Radiation calculation for FLASH2 HGHG (Q=0.25nC)
0 20 40 60 80 1000.0
2.0x108
4.0x108
6.0x108
8.0x108
1.0x109
P [
W]
s [m]
0 1 2 3 4 5 60.01
0.1
1
10
z [m]
Ra
dia
tio
n e
ne
rgy [
J]
Q= 0.25 nC
Radiator1
31 32 33 34 35 360.0
5.0x103
1.0x104
1.5x104
2.0x104
P(
) [a
.u.]
[nm]
Power distribution along the bunch
Radiation energy along the Radiator
Spectrum
Radiator calculation
Eend=32μJ
Radiation calculation for FLASH2 HGHG (Q=0.10nC)
-20 -15 -10 -5 0 5 10 15 20 250.0
0.2
0.4
0.6
0.8
1.0
1.2
E=100keV
I=0.5kA
Q=0.10nC
Current profile [kA/2]
Energy spread within 10 m slice [MeV]
Energy spread within 15 m slice [MeV]
Cu
rre
nt &
En
erg
y sp
rea
d
s [m]
𝜀𝑥𝑝𝑟𝑜𝑗 = 0.40𝜇𝑚 ∙ 𝑟𝑎𝑑, 𝜀𝑦
𝑝𝑟𝑜𝑗 = 0.39𝜇𝑚 ∙ 𝑟𝑎𝑑
9.5% bad particles are removed
Slice energy spread distribution (uncorrelated) Energy spread within 15μm and 10μm
slice length
Radiation calculation for FLASH2 HGHG (Q=0.10nC)
After the modulator
Radiation calculation for FLASH2 HGHG (Q=0.10nC)
0 10 20 30 400.0
5.0x108
1.0x109
1.5x109
2.0x109
2.5x109
3.0x109
3.5x109
4.0x109
P [
W]
s [m]
31 32 33 34 350.0
5.0x104
1.0x105
1.5x105
2.0x105
2.5x105
3.0x105
3.5x105
P(
) [a
.u.]
[nm]
0 1 2 3 4 5 6
0.01
0.1
1
10
Ra
dia
tio
n e
ne
rgy [
J]
z [m]
Q= 0.10 nC
Radiator1
Power distribution along the bunch
Radiation energy along the Radiator
Spectrum
Radiator calculation
Eend=61μJ
-100 -50 0 50 100 1500.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Q=1.0nC
Current profile [kA]
Energy spread within 10 m slice [MeV]
Energy spread within 15 m slice [MeV]
I=0.5kA
Radiation calculation for FLASH2 HGHG (Q=1.0nC)
Energy spread within 15μm and 10μm
slice length
𝜀𝑥𝑝𝑟𝑜𝑗 = 2.26𝜇𝑚 ∙ 𝑟𝑎𝑑, 𝜀𝑦
𝑝𝑟𝑜𝑗 = 2.24𝜇𝑚 ∙ 𝑟𝑎𝑑
Radiation calculation for FLASH2 HGHG (Q=1.0nC)
0 50 100 150 200 250 3000
1x108
2x108
3x108
4x108
5x108
6x108
7x108
8x108
s [m]
P [
W]
0 1 2 3 4 5 60.01
0.1
1
10
Ra
dia
tio
n e
ne
rgy [
J]
z [m]
Q= 1.0 nC
Radiator1
Eend=25μJ
31 32 33 34 35 360
500
1000
1500
2000
2500
3000
[nm]
P(
) [a
.u.]
Power distribution along the bunch
Radiation energy along the Radiator
Spectrum
Radiator calculation
The plan
1. Modifying the internal report of beam dynamics simulation for
FLASH2.
2. New beam dynamics simulations for FLASH2 for low bunch charge
cases.
3. Preparing for cascaded HGHG calculation (Modulator1 +
Dispersive chicane + Radiator1 + Fresh bunch chicane + Modulator2 +
Dispersive chicane + Radiator 2)