providing beams for power production what has been done problems and boundary conditions future...
TRANSCRIPT
Providing Beams for Power Production
What has been done
Problems and Boundary Conditions
Future improvements and possibilities
30 GHz Power Production in CTF336% Power lost in ‘Translation’
30 GHz Power Production in CTF 3/2004 run
70 MW, 80 ns 5 MW,400 ns, phase switch 30 ns rise time
(~100 MW out of Pets)
-200 -100 0 100 200 300 4000
20
40
60
80
100
120
140
Time (ns)
Po
we
r (M
W)
15-Nov-2004, 23:45:53, 2.8e-008 8e-008 3.2e-007 1.2e-007 mbar
50.4 MW82.6 ns
Prf1Pbpm240Pbpm280
-200 -100 0 100 200 300 400 5000
5
10
15
20
25
Time (ns)
Po
we
r (M
W)
02-Nov-2004, 19:45:52, 2.3e-008 6.8e-009 4.4e-009 4.7e-009 mbar
-200 -100 0 100 200 300 400 500
-100
-50
0
50
100
150
Time (ns)
ph
as
e (
de
g.)
Prf1
Pbpm240Pbpm280
30 GHz Power Production in CTF 3/2004 run
-200 -100 0 100 200 300 400 5000
10
20
30
Time (ns)
Pow
er (
MW
)09-Nov-2004, 14:50:45, 8.9e-008 9.9e-008 1.5e-008 1.1e-008 mbar
-200 -100 0 100 200 300 400 500-100
-50
0
50
100
Time (ns)
phas
e (d
eg.)
Prf1
Pbpm240
Pbpm280
20 MW,250 ns, phase switch 100 ns rise time
30 GHz Power Production in CTF 3/2005 run 2
60 MW, 70 ns 15 MW,300 ns
~100 MW out of Pets 25 MW out of Pets
50 100 150 200 250 300 350
10
20
30
40
50
60
70
80
90
Time (ns)
Gra
die
nt
(MV
/m)
120 140 160 180 200 220 240 2600
20
40
60
80
100
120
140
160
Time (ns)
Gra
die
nt
(MV
/m)
5.11.2005, 30 ns , 55-60 MW in CTFII, 85 % Transmission (Peak)
5A Beam set up first night
7 A out of the Gun
5 A before PETS
3.5A Beam along the LINAC
4.5 A out of the Gun
3.5 A before PETS
30 GHz Power Production in CTF 3
Expected Achieved
(Pout (MW) = 4.762 I2 (A) *F2)
3.5 A: 58 MW 30 MW ,90 %Trans
4.5 A: 96 MW 77 MW
5A: 119 MW 100 MW, 80 % Trans
95-100% Transmission
Power Production is consistent with F=0.9 for the current going into the PETS
Transmission achieved is very reasonable
0 0.5 1 1.5 2 2.5 32
3
4
5
6
7
8
S (m)
Be
am
ra
diu
s (
mm
)
= 1.4, = 100 = 0.9, = 150 = 0.6, = 200
PETS Transmission
Clearly very critical, has to be perfect for no losses !
0 200 400 600 800 1000-4
-3.5
-3
BPM0790
Cu
rre
nt
(A)
0 200 400 600 800 1000-3
-2.5
BPM0115
Cu
rre
nt
(A)
0 200 400 600 800 1000-3.5
-3
-2.5
BPM0240
Cu
rre
nt
(A)
0 200 400 600 800 1000-2.6
-2.4
-2.2
BPM0280
Cu
rre
nt
(A)
Beam stability with the 3.5 A beam for PETS
Beam stability with the 3.5 A beam for PETS
-3 -2.9 -2.8 -2.7 -2.6 -2.50
50
100
150
200
250BPM0115
-3.3 -3.25 -3.2 -3.15 -3.1 -3.05 -3 -2.95 -2.90
50
100
150
200
250
300
350BPM0240
-2.45 -2.4 -2.35 -2.3 -2.25 -2.20
50
100
150
200
250
300
350
400BPM0280
Standard deviation:
BPM0115: 2.6 %
BPM0240: 1.3 %
BPM0280: 0.9 %
0 200 400 600 800 1000-3.6
-3.5
-3.4
BPM0790
Cu
rre
nt
(A)
0 200 400 600 800 1000-3
-2.5
BPM0115
Cu
rre
nt
(A)
0 200 400 600 800 1000-3.5
-3
-2.5
BPM0240
Cu
rre
nt
(A)
0 200 400 600 800 1000-2.6
-2.4
-2.2
BPM0280
Cu
rre
nt
(A)
Beam stability with the 3.5 A beam for PETS
Rf jitter taken out
Beam stability with the 3.5 A beam for PETS
Standard deviation:
BPM0790: 1.5 % with rf jitter
BPM0790: 0.3% w/o rf jitter
-3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.90
200
400
600
800
1000BPM0790
-3.54 -3.53 -3.52 -3.51 -3.5 -3.49 -3.48 -3.470
50
100
150
200
250BPM0790
Switching of operation modes
Turns out to be unproblematic after some experience
Switching times of 15-30 Minutes achieved
But, a few critical elements:
(Gun, Collimators, RF-phases, Correctors)
ProblemsRepetition Rate: Got a leak at 50 Hz, 10 Hz most of the time
Radiation: Activation of the beam line around PETS
Collimators: Mechanical and control problems
Stay at 10 Hz for time being, work on Transmission, Move collimators as little as possible
ConstraintsGun current, Pulse Length and Energy
8-9 A Maximum out of Gun 6A Max into PETS
3.5 A 100 MeV 200 ns
5 A 90 MeV 200ns
6A 80 MeV 200 ns
3.5 A 80 MeV 400 ns
Overloading the structures at 6A
Future possibilities
0 100 200 300 400 5000
20
40
60
80
100
Pulse Length (ns)
Po
we
r in
CT
F II
(M
W)
Data achievedP*sqrt(pl)Pulse Compressor
Future possibilities
Beam studies to improve Emittance and to study trade off of bunch length vs Energy Spread
A little bit more current: 5.5 -6 A in front of PETS ? (115-137 MW out of PETS, 69-82 MW in CTF II)
Phase Flip for pulse compressor
Let’s aim for 100 MW into DUT
We are missing 60%:
30% from beam,
10% from losses,
20% from PETS (20 cm longer)
My conclusion