BC System – Review Options ● BC2 working point (energy-charge-compr.) ● 2BC...
-
Upload
jadyn-whitehead -
Category
Documents
-
view
234 -
download
0
Transcript of BC System – Review Options ● BC2 working point (energy-charge-compr.) ● 2BC...
BC System – ReviewOptions
● BC2 working point (energy-charge-compr.)
● 2BC (rf-rf-bc-rf-bc-rf)
● table: 2BC (rf-rf-bc-rf-bc-rf)
dogleg + 2BC (rf-dog-rf-rf-bc-rf-bc-rf)
n3BC (rf-bc-rf-rf-bc-rf-bc-rf)
3BC (rf-rf-bc-rf-rf-bc-rf-bc-rf)
rollover compression
● laser heater
● cases in detail
peak current
projected emittance
slice emittance
uncorrelatedenergy spread
remaining chirp
µ-bunch stability
parameter-sensitivity
arrival time stability
energy
charge
compression
1nC
511 MeV1 GeV
1.5 GeV2 GeV
2.5 GeV
510
1520
3040
full-40
-20
0.5nC 0.25nC
0.125nC
BC2 working point
details; see:http://www.desy.de/~dohlus/2005/2005.01.xfel/xfel_jan2005.pdf
2BC (rf-rf-bc-rf-bc-rf)
rf knobsr56 knobscompression
factors
absolute tolerances(amplitude & phase_deg)
µ-bunching gain
chirp
minimal relative tolerances
0
2
rmsnoise,
dGeI
I
shot noise dueto µ-bunching gain
mmBC156r
deg
L2
inverse tolerance noise: Irms/A
const.: E1, E2, E2’’, E2’’’, r56coll, C1, C1*C2tuned: E1’, E2’, r56BC2, parameter: r56BC1, L2
inverse tolerance
noiseIrms/A
const.: (E1), E2, E2’’, E2’’’, r56coll, (C1), C1*C2tuned: E1’, E2’, r56BC2, parameter: r56BC1, L2
20,500
10,500
10,400
20,400
5,400
C1, E1/MeV
inverse tolerance
noise
Irms/A
E1 = 400 MeVr56BC1 = 90mm, C1=5r56BC2 = 75mm, C2=20L2 = 10 degmin(ampl_tol) = 0.1%min(phas_tol) = 0.023 degnoise: Irms = 147 A
min(phas_tol) = 0.016 degnoise: Irms = 260 A
2BC
rf(1+3)-bc-rf-bc-rf-c
rollover compr.
rf(1+3)-bc-rf-bc-rf-c
dogleg+2BCrf-d-
rf(1+3)-bc-rf-bc-rf-c
n3BCrf-bc-
rf(1+3)-bc-rf-bc-rf-c
3BCrf(1+3)-bc-
rf(1+3)-bc-rf-bc-rf-c
E=400MeV2GeV
17.5GeV
C=520
0.98
r56=-90mm-75mm
0.84mm
ampl_tol=0.1%ph_tol=0.023deg
noise= 147 A
L2 = 10 deg
E=500MeV2GeV
17.5GeV
C=1010
0.98
r56=-100mm-200mm0.84mm
ampl_tol=0.2%ph_tol=0.055deg
small
L2 = 40.5 deg
E=130MeV400MeV
2GeV17.5GeV
C=1.24.17
200.98
r56=40mm-90mm
-87.2mm0.84mm
ampl_tol=0.11%ph_tol=0.040deg
noise= 270 A
e’=1%@ 130MeVL2 = 10 deg
t566_dog=1m
E=130MeV500MeV
2GeV17.5GeV
C=1.456.90
100.98
r56=-30mm-90mm
-45.0mm0.84mm
ampl_tol=0.09%ph_tol=0.048deg
noise= 95 A
e’=2.5%@ 130MeVL2 = 10 deg
E=130MeV400MeV
2GeV17.5GeV
C=1.254
200.98
r56=30mm-80mm
-83.7mm0.84mm
ampl_tol=0.11%ph_tol=0.045deg
noise= 93 A
e’=1.6%@ 130MeVL2 = 10 deg
t566_dog=1m
laser heater
1% energy offset transv. rms beam size
overlap of electron and laser beam !!!
cases in detail
● 2BC (rf-rf-bc-rf-bc-rf)
● dogleg + 2BC (rf-dog-rf-rf-bc-rf-bc-rf)
● n3BC (rf-bc-rf-rf-bc-rf-bc-rf)
● 3BC (rf-rf-bc-rf-rf-bc-rf-bc-rf)
● rollover compression
2BC (rf-rf-bc-rf-bc-rf)
dogleg + 2BC (rf-dog-rf-rf-bc-rf-bc-rf)
n3BC (rf-bc-rf-rf-bc-rf-bc-rf)
3BC (rf-rf-bc-rf-rf-bc-rf-bc-rf)
const.: E0=130MeV, E0’’, E0’’’,(E1), E2, E2’’, E2’’’, r56coll, C0=1.5,(C1), C1*C2tuned: E1’, E2’, r56BC2, parameter: r56BC1, L2
E1 = 400 MeVr56BC0 = 30mm, C0=1.45r56BC1 = 90mm, C1=6.9r56BC2 = 45mm, C2=10L2 = 10 degmin(ampl_tol) = 0.088%min(phas_tol) = 0.048 degnoise: Irms = 97 A
inverse tolerance
noise
Irms/A 20,500,5
15,500,5
15,400,5
20,400,5
10,400,5
C1*C0, E1/MeV,r56BC0/cm
1.45*6.9,400,3
rollover compression
1nC50 A
500 A 5 kA7 MeV 130 MeV 500 MeV 2 GeV 17.5 GeV
4 modules 12 modules 100 modules
3rd
keV 101 E 101 C keV 1002 E full2 C μm 1022
56 Er (heater)
m 2.0
256
r
m 1.0
156
r
m
91
e
m
90e
256
2 r
1
m
5.22
Lee
(500 MeV)
(2 GeV)
L22 tanGeV 2
GeV 5.1
m
5.17 keL
deg 5.40L2 GV 973.1L2 Udetails; see:
http://www.desy.de/xfel-beam/data/talks/talks/dohlus_-_rf_param_sensitivity_lcls_xfel_20060821.pdf
min(phas_tol) = 0.055 deg