lead ion tests in lear ppc - 19 septembre 1997 m. chanel
TRANSCRIPT
![Page 1: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/1.jpg)
LEAD ION TESTS IN LEAR
• PPC - 19 Septembre 1997 M. CHANEL
![Page 2: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/2.jpg)
PARTICIPANTS• D. Allen
• L. Badano
• D. Berlin
• J.L. Blanc
• J. Bosser
• B. Bouriquet
• H. Broere
• R. Brown
• C. Carli
• M. Chanel
• J. Duran-Lopez
• F. Formis
• A. Fowler
• H. Haseroth
• C. Hill
• S. Jacobsen
• C. Lacroix
• A. Lombardi
• R. Maccaferri
• P. Maesen
• S. Maury
• K. Metzmacher
• D. Möhl
• G. Molinari
• B. Moine
• H. Mulder
• F. Nanni
• M. O’Neil
• J.C. Perrier
• U. Raich
• S. Rossi
• E. Roux
• J. Sanchez
• R. Sautier
• E. Tanke
• G. Tranquille
• M. Vretenar
• et les autres
![Page 3: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/3.jpg)
LES MODIFICATIONS DE LEAR
The Lear machine layout in 1997
E-Coollong drift( 3m )
Fast Bump
ElectrostaticSeptum
The Lear machine layout in 1996
E-Coolshort drift( 1.5m )
Lear adapted for slow extraction
and jetset
Lear adapted for Multiturn injection and long ecool:-line transfo(2)-bumpers, move SEH-exchange s2/s3-ecool 3m drift-vacuum improvements
![Page 4: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/4.jpg)
The electron-cooling device in 1997
6
12
34
56
6
7
8
9
10 11
6
67
8
10
1213
1415
1617
9
1 Variable perveance gun2 Cathode3 Grid anode4 Ground potential anode5 NEG pump6 Solenoid7 Neutralisation electrodes8 Toroid chambers with pumps and diagnostic ports
9 Toroid NEG pumps10 Pick-up stations11 Central drift tube12 Collector drift tube13 Collector vacuum valve14 Collector entrance coil15 Repeller16 Collector17 Collector end coil
3.0 m
5
Longer, more negs, magnetic measurements, new controls, smooth continuous tube(no natural neutralisation)
![Page 5: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/5.jpg)
Caractéristiques des Machines Machine 1
• Cooler: D=3.5m, h=1.7m, v=6.5m
• Injection:D=3.5m,h=1.7m, v=6.5m
Machine 97
• Cooler: D=0 m, h =5 m v=4.4m Injection:D=10 m, h =3.3m v=6.6m
Machine 4/96
• Cooler: D=0 m, h =9.5 m, v=7m
• Injection: D=0 m, h =9.5 m, v=7m
![Page 6: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/6.jpg)
LE REFROIDISSEMENTEN INJECTION MONOTOUR
• La charge d’espace
• Le cooling des grandes émittances
• les comparaisons des différentes machines
![Page 7: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/7.jpg)
Charge d'espace pour Ie=288mA,machine 1,eps=50pi
-8
-3
2
7
12
17
-30 -20 -10 0 10 20 30
x[mm]
dp
/p
dp/pecool
dp/pmach
xeps-
xeps+
![Page 8: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/8.jpg)
Charge d'espace pour Ie=288mA,machine 97,eps=50pi
-8
-3
2
7
12
17
-30 -20 -10 0 10 20 30
x[mm]
dp
/p
dp/pecool
dp/pmach
xeps-
xeps+
![Page 9: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/9.jpg)
Charge d'espace pour Ie=288mA,machine 97-2,eps=50pi
-8
-3
2
7
12
17
-30 -20 -10 0 10 20 30
x[mm]
dp
/p
dp/pecool
dp/pmach
xeps-
xeps+
![Page 10: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/10.jpg)
Charge d'espace pour Ie=288mA,machine 1, neutralisation 36%
-8
-3
2
7
12
17
-30 -20 -10 0 10 20 30
x[mm]
dp
/p
dp/pecool
dp/pmach
xeps-
xeps+
![Page 11: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/11.jpg)
TRANSVERSE COOLING OF LARGE AMPLITUDES
Charge d'espace pour Ie=288mA,machine 97,eps=50pi
-8
-3
2
7
12
17
-30 -20 -10 0 10 20 30
x[mm]
dp
/p
dp/pecool
dp/pmach
at beginning
after long. cool.
after transv. cool.
![Page 12: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/12.jpg)
MEASURED TRANSVERSE COOLING OF LARGE AMPLITUDESbeam partially kicked, Ie=120 mA, machine 1, ‘eps’=22 pi
• Top view longitudinal Schottky • Top view horizontal SchottkyT
i me [
160m
s to
t.]
dp/p[4%o tot]df/f[4%o tot]
Tim
e[16
0ms
tot.]
Pbrk09Pbrk09
![Page 13: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/13.jpg)
MEASURED COOLING OF A MONOTURN INJECTED BEAMIe=52 mA, machine 97
• Top view longitudinal Schottky • Top view horizontal SchottkyT
i me [
1 s
tot .]
Time[1 s tot.]
Tim
e[1
s to
t .]
pb97g03pb97g03
![Page 14: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/14.jpg)
MEASURED COOLING OF A MONOTURN INJECTED BEAMIe=52 mA, machine 97
• BIPMH: one measurement every 50ms
• here at 0, 200, 350, 1000 ms
• BIPMH:evolution of beam dimension
-20 -10 0 10 200
2
4
6
8
10
0 500 1000 1500 2000-2
0
2
4
6
8
10
12
40
50
60
70
80
90
100
-20 -10 0 10 200
1
2
3
4
5
6
7
-20 -10 0 10 200
1
2
3
4
5
-20 -10 0 10 200
2
4
6
8 [m
m]
sum
Time[ms]
pb97g03pb97g03
![Page 15: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/15.jpg)
Machine 1-97 260mApbb013pbb013
• Top view longitudinal Schottky • Top view horizontal Schottky
Ti m
e [45
0ms
tot.]
Ti m
e [45
0ms
tot.]
dp/p[4%o tot]
![Page 16: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/16.jpg)
Machine 1-96 256mA
pb96009pb96009
• Top view longitudinal Schottky • Top view horizontal Schottky
Ti m
e [40
0ms
tot.]
Ti m
e [40
0ms
tot.]
dp/p[4%o tot]
![Page 17: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/17.jpg)
Machine 1-97 260mA better adjusted
pbb021pbb021
• Top view longitudinal Schottky • Top view horizontal SchottkyT
i me [
300m
s to
t.]
Ti m
e [30
0ms
tot.]
dp/p[4%o tot]
![Page 18: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/18.jpg)
MEASURED COOLING OF A MONOTURN INJECTED BEAM BY BIPM
compare BIPM machine1-97/machine1-96, Ie=260mA
0
2
4
6
8
10
12
14
0 100 200 300 400 500 600
t[ms]
[mm
]
machine1-97 x[mm]
machine1-96 x[mm]
compare BIPM machine97/machine4-96, Ie=200mA
0
2
4
6
8
10
12
0 200 400 600 800 1000
t[ms]
[mm
]
machine97 x[mm]
machine4-96 x[mm]
Compare.xlsCompare.xls PRELIMINARY
![Page 19: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/19.jpg)
Comparaison ‘cooling rates’ 97/96
machine 1 ecool 3m,1.5m
0
1
2
3
4
5
6
7
8
9
10
0 50 100 150 200 250 300 350 400
Ie[mA]
1/th[s
-1]
machine1-97:1/th[ms]
machine1-96:1/th[ms]
machine 97 et machine4-96
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
0 50 100 150 200 250 300 350 400
Ie[mA]
1/th[
s-1]
machine4-96:1/th[ms]
machine97:1/th[ms]
Compare.xlsCompare.xlsPRELIMINARY
![Page 20: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/20.jpg)
Comparaison de toutes les machines testées
0
2
4
6
8
10
12
14
0 50 100 150 200 250 300 350 400
Ie[mA]
1/th
[s-1
]machine 7-96 1/th[ms-1]
machine97:1/th[ms]
machine4-96:1/th[ms]
machine1-97:1/th[ms]
machine1-96:1/th[ms]
PRELIMINARY
Compare.xlsCompare.xls
![Page 21: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/21.jpg)
L’INJECTION MULTITOURS COMBINÉE
• Le Principe
• Le LinacIII
• Les bumpers
• Le résultat sur la machine 97
• Conséquences sur le vide
![Page 22: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/22.jpg)
Le principe• Pendant la décroissance du bump, augmenter P du faisceau
injecté tel que le point d’injection reste le même (D grand).
Injection into machine 97 (dp/p from -1 to 3%o)
0
5
10
15
20
25
30
35
40
45
50
-30 20 70 120 170 220
t[s]
x[m
m]
bump[mm]
D dp/p[mm]
inj. point[mm]
Le septum
Compare.xlsCompare.xls
![Page 23: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/23.jpg)
Le linacIII• Change the amplitude
of Tank 3.• Change the phase of
the Debuncher• All in 80 to 200 s
Phase debuncherTank3 amplitude
Linac3.pcxLinac3.pcx
![Page 24: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/24.jpg)
Les bumpers
• 4 bumpers with 4 individual power supplies.
• 4 slopes (15, 25, 70 200 s).
• The kick at 340/MeV/c/charge is 10 mrad max
Bumpers.pcxBumpers.pcx
![Page 25: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/25.jpg)
Les résultats
• 4‰ (-1 to 3) injected.• Up to 6 109 charges per
injection with machine 97 and 200s bump fall.
• With injection all day long, degradation of vacuum.
Spectre.pcxSpectre.pcx
![Page 26: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/26.jpg)
Conséquences sur le vide• Losses due to multiturn
injection, charge exchange with résidual gases and électron recombination give outgassing of vacuum chamber and specially BIPM( Vespel®, Kapton®).
• Limit accumulation (next chapter) and gives life time of less than 1 s.
• BIPMV out gives 5 s. during accumulation with Ie=100 mA.
pression partielles des gaz principaux (%)
0
10
20
30
40
50
60
70
80
H2 CH4 C0
Axis
Titl
e
avant injection
injection permanente
![Page 27: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/27.jpg)
LA MULTI-INJECTION
• Le principe
• les résultats
![Page 28: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/28.jpg)
Le Principe• Inject a beam and cool it
to -x‰ in momentum in less than the répétition cycle.
• -x‰ is such that the stack is not lossed during next injection
• The cooling could be done using beam dragging for machine with zéro-dispersion at the cooler -3
-2
-1
0
1
2
3
4
5
-30 -20 -10 0 10 20 30
x[mm]
dp/p
dp/pecool
dp/pmach
xeps-
xeps+
dp/pecool
![Page 29: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/29.jpg)
Les résultats• Up to 1.7 1010 charges
accumulated (saturation effect due to vacuum degradation and other beam losses) using machine 97 and Ie=100 mA. Cooling time with dragging is less than 400 ms.
Nombre de charges injectées et durée de vie en fonction du nombre de shots]
0
2
4
6
8
10
12
14
0 20 40 60 80 100 120
nombre de shot injectés
Multishots.xlsMultishots.xls
![Page 30: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/30.jpg)
Multi-injection seen on transfo
Stacking.pcxStacking.pcx
![Page 31: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/31.jpg)
MULTI-INJECTION WITH MACHINE 97 (Ie=110mA,ht=10V,300ms,R=50 ms)
• Top view of long. Schottky • Top view horizontal Schottky
pbc027pbc027
Ti m
e [10
00m
s t o
t.]
Ti m
e [10
00m
s t o
t.]dp/p[4%o tot]
![Page 32: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/32.jpg)
MULTI-INJECTION WITH MACHINE 97 (Ie=110mA,ht=10V,300ms,R=50 ms) BIPMH
BIPM Beam Size During Stacking
0
2
4
6
8
10
12
0 1000 2000 3000 4000 5000 6000
time [s]
sig
ma [
mm
]
without sweeping
with sweeping
Tcool1.xlsTcool1.xls
![Page 33: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/33.jpg)
MULTI-INJECTION WITH MACHINE 1
• The first tests show that no dragging is (needed) possible.
• Cooling with Ie=100mA is about 400 ms.
![Page 34: LEAD ION TESTS IN LEAR PPC - 19 Septembre 1997 M. CHANEL](https://reader035.vdocuments.us/reader035/viewer/2022070306/551668a1550346b2068b61c0/html5/thumbnails/34.jpg)
CONCLUSIONS
• Ecool 2 times longer give ~2 times more cooling rate
• Machine 97 good for combined multi-turn injection
• beam stacking up to 1.7 1010 charges is working well
• machine 1 not completely tested
• stacking at 3 Hz rate not tested
• Good vacuum quality very important
• Still to do