fd jitter tolerance study min-huey wang. 2 introduction investigate three bds designs l* 4.5 m, l*...
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FD Jitter Tolerance Study
Min-Huey Wang
2
Introduction
• Investigate three BDS designs L* 4.5 m, L* 4.0 m and L* 3.5 m.
• Using 500 GeV baseline parameters from TDR Table 2.1 and Table 8.2.
• Using elegant + GUINEA-PIG to simulate LUMI loss criteria for QF1/SF1/OC1 and QD0/SD0/OC0 offset with IP fast-feedback compensating.
• Three locations of FFB thin length kickers are simulated (beam direction).
- At middle of QF1 and QD0- Before SD0- After QD0 (L* 4.0 m)
• Track 80k macro particles (e- & e+ side) from QF1 -> IP with RMS vibration in horizontal and vertical planes.
3
IP FFB kicker position
QD0QF1SD0SF1
Simulate the kicker effect at three locations
IP
4
• Track 80K macro particles (e- & e+ side) from QF1 -> IP with RMS SF1/QF1 and SD0/QD0 vibration in horizontal and vertical planes.
• Results show mean and range of luminosities from 100 consecutive pulses.
L* 3.5 m waist (FFB kickers 1.5 m upstream SD0)
0 100 200 300 400 500 60040
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 3.5 m
5
• Track 80K macro particles (e- & e+ side) from QF1 -> IP with RMS SF1/QF1 and SD0/QD0 vibration in horizontal and vertical planes.
• Results show mean and range of luminosities from 100 consecutive pulses.
L* 3.5 m waist (FFB kickers right before SD0)
0 100 200 300 400 500 60040
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 3.5 m
6
• Track 80K macro particles (e- & e+ side) from QF1 -> IP with RMS SF1/QF1 and SD0/QD0 vibration in horizontal and vertical planes.
• Results show mean and range of luminosities from 100 consecutive pulses.
L* 4.0 m waist (FFB kickers 1.27 m upstream SD0)
0 100 200 300 400 500 60040
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 4.0 m
7
• Track 80K macro particles (e- & e+ side) from QF1 -> IP with RMS SF1/QF1 and SD0/QD0 vibration in horizontal and vertical planes.
• Results show mean and range of luminosities from 100 consecutive pulses.
L* 4.0 m waist (FFB kickers right before SD0)
0 100 200 300 400 500 60040
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 4.0 m
8
• Track 80K macro particles (e- & e+ side) from QF1 -> IP with RMS SF1/QF1 and SD0/QD0 vibration in horizontal and vertical planes.
• Results show mean and range of luminosities from 100 consecutive pulses.
L* 4.0 m waist (FFB kickers after QD0)
0 100 200 300 400 500 60040
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 4.0 m
9
• Track 80K macro particles (e- & e+ side) from QF1 -> IP with RMS SF1/QF1 and SD0/QD0 vibration in horizontal and vertical planes.
• Results show mean and range of luminosities from 100 consecutive pulses.
L* 4.5 m waist (FFB kickers 1.25 m upstream SD0)
0 100 200 300 400 500 60040
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 4.5 m
10
• Track 80K macro particles (e- & e+ side) from QF1 -> IP with RMS SF1/QF1 and SD0/QD0 vibration in horizontal and vertical planes.
• Results show mean and range of luminosities from 100 consecutive pulses.
L* 4.5 m waist (FFB kickers right before SD0)
100 200 300 400 500 600
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 4.5 m
11
Summary
• The FFB kickers close to or after QD0 have less negative impact on beam luminosity
100 200 300 400 50040
50
60
70
80
90
100
RMS SF1/QF1 + SD0/QD0 x & y vibration /nm
% N
omin
al L
umin
osit
y
L* 3.5 mL* 4.5 mL* 4.5 m corL* 3.5 m corL* 4.0 mL* 4.0 m corL* 4.0 m cor1
12
Jitter tolerance of 2% luminosity loss
L* 3.5 4.0 4.5
Between QF1 QD0 < 25 21 100
Before QD0 < 25 42.6 <25
After QD0 --- 25 ---
13
Summary
• The luminosity of idea beam w/o waist shift is 1.36/1.51/1.45E34 cm-2 s-1 (L*4.5/4.0/3.5) from GUINEA-PIG. It is close to geometric luminosity of 1.47E34 cm-2 s-1 in TDR.
• Scanning the y waist the best luminosity is 1.69/1.70/1.58E34 cm-2 s-1 (L*4.5/4.0/3.5) at y waist 405/300/240 mm.
• The jitter tolerances of three BDS designs are similar.
• The effect of distance of FFB kickers from SD0 start to take effects with incresing RMS jitter.