View
827
Download
1
Category
Tags:
Preview:
DESCRIPTION
SNS Linac experience
Citation preview
������������ ������
����� ��� � �� � �� �� � � � � � � �
� � � � � � ��� � �� � � �
� ! � �� " � � � � � � � �# # � � �$ �% � � "
2 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
���������������������������������
Dec. 15, 1999
March 2000
Sept. 2005
3 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
������������������ ��� ������
ORNL was responsible for integration, installation, commissioning and operation
Need a strong central team to take intellectual ownership of the accelerator
4 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
��� � ������������� ������� ����������������������� ��
2002 2003 2004 2005 2006
DTL Tanks 1-3
Front-End
DTL Tank 1
DTL/CCL
SCL
Ring
Target• �� � �& � " " �� � � � �� ' � � " � � �' � � � � �� � ( �� � ' � � � � #� � ) � & � � " � *� � � �� �
�" �� ' �( �� ' � � �� � �� # ) � � � � � � ��� � � � � �+ ,
• - � � � �" � ) � � � � � ��� � �� # � �� � � � � ' � � � � � � �' �� � ��& � �� � � � (
5 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
!� ���"������������#�������$�%���
• . / � ��� ' � � �� � ' � � � ( � ) � � ( � ��� � � � ( � � % � � ' � � � � � � � �� � � � � � � � �� / � �� & � �� �
1177 MW-hrs
480 MW-hrs
210 MW-hrs
127 MW-hrs
Pow
er (k
W)
Flue
nce
(MW
-hrs
)
6 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
!$&�
• � #� � 0 / � � � & 1 ( � / � �� ' 2 �� � �( � � �
• . / & #� � � � � � � � ( � 3 4 5 �� � � ( ' � �5
– *) � � �� ' � � �� � ) ,
Ion Source
Radio-Frequency Quadrupole
� �����
� ����� output
• 402.5 MHz
7 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
'������% ������
�����
� ���� output
• 6 Tanks
•210 drift tubes
•PM quadrupoles
• 2.5 MW klystrons (402.5 MHz), 1 per tank
• Experience with PM quadrupoles is fine
• Minimal beam loss / activation observed
• Robust structure
8 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
������ �����������
CCL is also a robust structure
- Issues with RF induced gate-valve failures
Some beam loss near the CCL entrance and exit
� ����
� ����� output
• 4 modules
• 48 segments
•5 MW klystrons (805 MHz), 1 per module
9 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
�% �����%���������
• �6 - � � � � �� � � � � � � � " #� " � � � � � � � � � 7
• �6 - � � � �� � #� � � � � � �� � �� � 8 � � & " ( / �� �
• % ) � � � � �� � ' � " � � �� � � � � / � � ( � � � � � � � ( � � � ' � �� � � � �� �� � � � � � �� �
• 9 � � � � � � � � :
• � � � �& � � � � *� � ;� < = �;� � � � ,
Medium beta – 0.61
High beta – 0.81
• SCL is flexible
• Issues with accessories (HOM couplers, piezo tuners, …)
• Unexpected low level of beam loss
10 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
��������������� ������������
• 6 � � � & ' � � ( �� � � � � �� ' � � � � � / � �# � " � � � � � � �
• > � �� �� � ( � � �' � � � � " � ( �/ " ββββ � � � � �� � � � � �� � � # � " �� �' � ββββ� � � � �� � / � ( � � � � � # � "
• 9 � � � � ��) � � � � � 3 ? 5 �� � � � � � � ' & ' � �� � � � ( � � �' �
• $ � � ( �� � �� ) #�� @ �� �� � � / � *� 4 � A � � � � � � 7 ,
0
2
4
6
8
10
12
14
16
18
1a 1c 2b 3a 3c 4b 5a 5c 6b 7a 7c 8b 9a 9c 10b
11a
11c
12b
12d
13b
13d
14b
14d
15b
15d
16b
16d
17b
17d
18b
18d
19b
19d
20b
20d
21b
21d
22b
22d
23b
23d
Cavity number
Eac
c (M
V/m
)
Aug_08 Nov_08
+ 25%design
0
2
4
6
8
10
12
14
16
18
1a 1c 2b 3a 3c 4b 5a 5c 6b 7a 7c 8b 9a 9c 10b
11a
11c
12b
12d
13b
13d
14b
14d
15b
15d
16b
16d
17b
17d
18b
18d
19b
19d
20b
20d
21b
21d
22b
22d
23b
23d
Cavity number
Eac
c (M
V/m
)
Aug_08 Nov_08
+ 25%design
11 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
��������������� �������������"
0
5
10
15
20
25
30
Medium beta cavity High beta cavity
Ave
rag
e E
acc
(MV
/m)
60 Hz collective limit
Individual limit or low rep rate collective limit (<20 Hz) inclosed loopIndividual limit or low rep rate collective limit (<20 Hz) inopen loop
0 10 20 30 40 50 60
Electron loading (EG heating, gas burst, quench)
Coupler Heating
HOM (1cavity disabled,
5 limited by large coupling)
Quench (hard, Eacc<10 MV/m))
Lorentz force detuning
No limits up to 22 MV/m
No. of cavities
• 6 � � � & � � � # � " � � � � ��" � �
– B �� �( � " �� � � � *" � C � ��" � �� ' #� � � ,
– 6 / � �� � � � � �� '
– 9 � � � �
• 6 ��� � �� � ��" � � � � 0 / �� � � � � � �� ' � � � � �� � � � �� ;5 � � � ) � � “�( � � �”�� ( �� �( / � ���" � �
• � � � � � � � � �� ' � � �� � " � � � � � � � �� ' � � " � � �' � �� � � � � � � � � � � � � � �' � � ( �� � �
12 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
SRF, ß=0.61, 33 cavities
1
from CCL
186 MeV
805 MHz, 0.55 MW klystron
805 MHz, 5 MW klystron
402.5 MHz, 2.5 MW klystron
86.8 MeV2.5 MeV
RFQ
(1)
DTL
(6)
CCL
(4)
�����!$�����%�
SRF, ß=0.81, 48 cavities1000 MeV
(81 total powered)
379 MeV
Warm Linac
SCL Linac
• Warm linac has 10 independently powered cavities• SCL has 81 independently powered cavities
� Many values to set w.r.t. the beam� A lot of Equipment to keep running!!!
DTL KlystronCCL Klystron
SCL Klystrons
13 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
( ��� ������������%������)��� ����%
• - � � ' � � � � � � � ( � � � � � *� � ' � / ( �� � �,� � ( � � � � ' & ' � �� � � � � � � � �� � � �� ' � � / � / � �
• ��� ' �� � � � � � > B � � � � � � � ( � " � �� / ( � � � �� '
Longitudinal phase advance through 1st DTL tank
TOF
Cha
nge
RF Cavity Phase
Different RF amplitudes
•Each cavity has a unique response (signature) to phase and amplitude scans
•Phase scan signature matching method uses model to match measurements and determine RF amplitude and phase setpoints
14 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����������%������)��� ����%
• �" � ��δδδδββββ � � ( � " � ��� � ' � / ( �� � �� � � � � � ( � � � � � � � � � � � � &
– 6 � � � �( � � �> B ' � � � �� � A � � � & / � ( � � � � � ( � � > B � � �� � � � � �� ) � � � � � � � "
• $ � � � �/ � � � � � � � � �� ' # � � � � � � � � � & D
– �� � � � � � � � � & � " � �� / ( � # � � � " � @ �" / " � � #� ' � � ( �� �
– B �� @ �� ��� & �� � � > B � � � � � � � / �
RF Phase
Dow
nstr
eam
Pic
kup
TOF
Black = measured
Red = sine fit
15 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
�% �����%����������!$����% ���
• � ( � �� � � � ( � � � ( �� � � � # � � � � � � ' � �� � � ( ) � � � � � " > B � � / � � � � � ( � � � � � ' � � �� / � � � � � " > B � " � �� / ( � � � ( E � � � � � � � � � � � � � �� ��
– F � � � � � � � � ' � �� � � � ( �� � ( � � � �� � � �" �
– G / �� � �& � � � � � � #� " / � � � � � " > B � � � � ' � �
• �� � ( / � � � " � � & � � � �� ��� �� �
– % � � �6 - � � � � � � �� ) � ( � � � � ��� � � � #�� #�� � � �& � � ' � � " " � � �� > B � �� � �
Cavity:
Arrival Time:
16 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
* �����������������+����$�%���!��+�������� ���"
• �� � � � � � �� ' � � � ��� � � � � � �� � � � ( � � � � � � � / � � � ( ## � � � � � � � �� � " � �� / ( � � � � ( / � � ( # � � � #� � � � � � � �� � � � � & ) � � � � / � � � ( � � � � � �
• % � � #� / � � � � � � � & � � � � " � ) � � � � � ��� ( 1 � ��� � � � 2
• H � � � � � � � � � � � � � � � � �� ( �� � � � � � � � ��� ' ) � � ) � � �� 4 ( � ' � � � �
• $ ( � � � � � �� � � � � ' � �� � � � " � � �
-400
-300
-200
-100
0
100
200
300
1 7 13 19 25 31 37 43 49 55 61 67 73 79Cavity
Ph
ase
Ch
ang
e (d
eg)
-6
-4
-2
0
2
4
6
Mea
sure
d E
rro
r (de
g)
Phase ChangeMeasured Error
17 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����*� �����,���%��� �����-.�/����
• 6 � � � � �� / �� � � � � � ' � / ( �� � �� � � � � � � � � � � � � � # � � � �6 - ��� � �
• F � �� ' � � � ��� ' � � � � �0 / � � � � � � � � � � # � " � � � � � � � � � � � � � � � � � � � � � � � � ( " � � � / � � � � � � " �� � � �
Consider this part of the scan
18 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
,���%��������*� ����
• 6 � � � � � � � � � � � � � � � " � � � / � � " � � #� " � � � � � � �
From Beam LossFrom Current Transmission
19 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
*�����������0������������������%������-.�/����
• �� � � � � � � � " � � � � � # � � � � � � � �� � / � � � " � � � � ' &
– � � � � / � � � � � � � � " � � ( � � � " � / � � � � *� � � � � � " ,
– � � � � / � � � � � � � " - � � *� � � �� ( �� � � ,
RMS Bunch Length
Halo tail ???
20 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
Total Expected Beam Loss & Hottest Expected Spot Meet Requirement
0 1 2 3 4 5 6 7 8Ptotal (W )
Fre
quen
cy
Expected Total Beam Loss100 Linacs, all errors
0 40 80 120 160 200W (M eV)
0
1
2
3
4
Bea
m L
oss
(W)
"Hot spots"
worst caseexpected loss
100 Linacs, all errors
21 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
�����)��� �������%��
0 20 40 60 80 100 120 140 160 180 200W (M eV )
0
5
10
15
20
25B
eam
Los
s (W
)
Pm inPavePm ax
10 Linacs , a ll errors+ m ism atch
DTL-CCL Transition CCL-SCL Transition
22 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
�����)��� ����������������
• � " � � � � " � � � � � � �� �� �� . % - E6 6 -
• $ � � � " � � � � � � ( �� � ( �� � � �6 -
23 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
������������������+�����
• ����������������
– � �� � ���� �� � ���� �� �� � � ����� �����
– ���� � � ������ �� � � � � �
• � ���� ������� � � � � � ���� �� ��� ����� ���� � �� � ��� �� �� ���� ������ �� �
• ! ���� ����� �� ���
– ���� � ���� � ���� �� ��"����� � ��� �! # $ ��%����� ���� ��& ' ���� �"� �(
– ) � � ����� ��� �� � ����� ������� �� � � �%�� � ����� �� ������ (
– ! �� �"� � ����� � � ��� ������ �� � � � �%�� � ����� � (
Prompt radiation due to beam loss Residual activation @ 1ft after ~ 48hIn
tegr
al B
LM d
ose
[Rad
]
Beam Loss monitor #
24 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����)��� �����
• - � � � � � � � �� � � � �� ��(
• . �##� � � � � � ' � / ( �� � �� � � � � �� ) � � � � � � � � � � � �� �� � � �+
SCL Loss
0
50
100
150
200
SCL_Diag
:BLM
00
SCL_Diag
:BLM
01c
SCL_Diag
:BLM
02c
SCL_Diag
:BLM
03c
SCL_Diag
:BLM
04c
SCL_Diag
:BLM
05c
SCL_Diag
:BLM
06c
SCL_Diag
:BLM
07c
SCL_Diag
:BLM
08c
SCL_Diag
:BLM
09c
SCL_Diag
:BLM
10c
SCL_Diag
:BLM
11c
SCL_Diag
:BLM
13b
SCL_Diag
:BLM
14c
SCL_Diag
:BLM
16b
SCL_Diag
:BLM
17c
SCL_Diag
:BLM
19b
SCL_Diag
:BLM
20c
SCL_Diag
:BLM
22b
SCL_Diag
:BLM
23c
SCL_Diag
:BLM
25b
SCL_Diag
:BLM
26c
SCL_Diag
:BLM
28b
SCL_Diag
:BLM
29c
SCL_Diag
:BLM
31b
SCL_Diag
:BLM
32c
BLM
Rad
/C
1/24/08 300 kW6/17/08 - 480 kW12/15/08 - 650 kW
SCL Beam Loss
-50
0
50
100
150
200
250
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76
Warm Section
Rad
/C
10/13/2008
11/2/2008
11/24/2008
12/15/2008
1/6/2009
Beam Loss = dt� targetonpowerbeamsignallossbeam over 3 week run
25 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����!����%���*��+������� �������!%��������
• I � �� � � � �� � �� � � � � � �� ' � � � � � � � � � � � " / � #� � � " � � � � " � � (
• �6 - � � �� � � � J � � � � � ' � #� �� � � ) � � " � � � � � � �� � � � � ( �� ' �
Linac Activation
05
101520253035
Dec-06
Mar-07
Jun-0
7Sep
-07Dec
-07Mar
-08Ju
n-08
Sep-08
Dec-08
Run
mre
m/h
r
0200400600800100012001400
MW
-hrs
<SCL>
charge1
3
1days after run3
26 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
• �6 - � � � �( / � �� � �� � � � � / ��( � / � 0 / �� � �& ( / � �� ' � � / � � & � ��
• 6 � � � � > �� ' � � �� � � � � / ��( / � �) � �� � �� " � � � � � ( &
Average SCL Residual Activation
01020304050607080
4/28
/200
7
8/6/
2007
11/1
4/20
07
2/22
/200
8
6/1/
2008
9/9/
2008
12/1
8/20
08
3/28
/200
9
Run
Avg
. War
m S
ectio
n A
ctiv
atio
nm
Rem
/hr
summer 07winter 08spring 08Fall 08
12 hr cooldown
Ring Foil Activation
0
100
200
300
400
500
600
4/28/2007
8/6/2007 11/14/2007
2/22/2008
6/1/2008 9/9/2008 12/18/2008
3/28/2009
Run
mR
em/h
r
summer 07Winter 08Summer 08Fall 08
27 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����!����%���*��+������������$������"�������'���
• �/ ' ' � � � � � � � � � � � � � #� � � � ���� � ( 1 � � � " �� � � 2
• � � � � � � �� � � �� ' � ( ( � � � � �' � " " � �� � � � " � � � / � � " � � � �( � � �#& " � � � �� �� " � � � � � �
• �� � � & � � � � � � � � �� � � � " � � � � � / ' � / � � �6 - �) � �� � �� � �� � � �& " � � � / � � � � ��
Summer 2008
0
0.2
0.4
0.6
0.8
1
1.2
0.00 5.00 10.00 15.00 20.00 25.00
Days after Production
Rel
ativ
e A
ctiv
atio
n SCL 2_3SCL_12-13SCL 16_17SCL 32Ring FoilRing A13b
28 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
0.0E+00
5.0E-05
1.0E-04
1.5E-04
2.0E-04
SCL_Diag
:BLM00
SCL_Diag
:BLM04
bSCL_
Diag:B
LM08a
SCL_Diag
:ND12
SCL_Diag
:ND16
SCL_Diag
:ND20
SCL_Diag
:ND24
SCL_Diag
:ND28
SCL_Diag
:ND32
BckGrndBump15Laser15
10 nsec laser pulse, 20 µsec beam pulse
LaserEnhanced loss
Bea
m L
oss
����)��� ������,�����%��
• F � �� ' � �� � � ��� � � � � � � - � �K ;@ � � �� � � � " � � � � � � �' � � � � � � � �� �� � � �6 - ( / � �� ' � � ( / � � �
• 6 � � �� � � ) � � � � � � � / � � � �" � � � #� " � � � ��� ( � � � � � ���� �3 � @ � � �� � � � ) � � " � � � � � *L #� � � � #� �4 ,
• I � �� � � � #K � � � " � � " E� � M � # � # � � � � � � � �� � � �� � ) � � K 3 � � E" � K � @ � � �� � � � " � � � E) � � " � � � � �
• � � � " � � � �� � � " � ��#� � � � � # � � � � � " *K � � �;,� � � ) � � " � � � � �
Single electron laser stripping is used for profile measurements in the SCL
29 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
1 ������ �����)��� ������"���%����� �������������� ����
• �6 - � � � " � � � � � � � � 6 6 - 4 � � � / / "
• F � � � � � " �6 - � � � � � � � � ' �& �� #�/ � � � � ( � & ' � � � � �� � �� '
• B � " �6 - � � ( ) � � � � � " �� � �� �� � �& ) � � � � ##� �
• 6 6 - 4 � � � / / " �� � � � ) � � � #�@ � ( � �� / � ' �
Red= CCL4 vacuum
Others = SCL beam loss
~ 3 hours0
1
2
3
4
5
6
7
0 2 4 6 8 10
CCL Vacuum (E-7 Torr)
Bea
m L
oss
(E-4
Rad
/pul
se)
BLM03BLM07BLM10Linear (BLM03)Linear (BLM07)Linear (BLM10)
30 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����)��� ������# ���������)%�
• � / " � *� � � " ( �� � �� � � " � � ,�� � � � �� � ) � � � � � � � � � � � �� ;
SCL Beam Loss with Local Bumps
0
0.5
1
1.5
2
2.5
SCL_Diag
:BLM20b
SCL_Diag
:BLM21c
SCL_Diag
:BLM23b
SCL_Diag
:BLM24c
SCL_Diag
:BLM26b
SCL_Diag
:BLM27c
SCL_Diag
:BLM29b
SCL_Diag
:BLM30c
SCL_Diag
:BLM32b
HEBT_Diag:B
LM02
HEBT_Diag:B
LM05a
HEBT_Diag:B
LM07a
HEBT_Diag:B
LM09
rela
tive
loss
H Bump 23V Bump 23
• H � � �� �� � � / � � � #� � � � � � � ( � � �
– > B
– � � ' � � �� � � �� � �� '
– 9 ##� � � � ' & � � � "
– < �' � � � � ( � � " � ' � � " / � ��� �� � *N O � � � ' P� � �� ,
SCL Beam Loss with Local Bumps
0
0.5
1
1.5
2
2.5
SCL_Diag
:BLM20b
SCL_Diag
:BLM21c
SCL_Diag
:BLM23
b
SCL_Diag
:BLM24
c
SCL_Diag
:BLM26b
SCL_Diag
:BLM27c
SCL_Diag
:BLM29b
SCL_Diag
:BLM30c
SCL_Diag
:BLM32b
HEBT_Diag:B
LM02
HEBT_Diag:B
LM05a
HEBT_Diag:B
LM07a
HEBT_Diag:B
LM09
rela
tive
loss
5 mm Cav on8 mm Cav on5 mm Cav off8 mm Cav off
31 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
Quad Strength Sensitivity
0
0.5
1
1.5
SCL_Diag
:BLM
04b
SCL_Diag
:BLM
05c
SCL_Diag
:BLM
07b
SCL_Diag
:BLM
08c
SCL_Diag
:BLM
10b
SCL_Diag
:BLM
11c
SCL_Diag
:BLM
13b
SCL_Diag
:BLM
14c
SCL_Diag
:BLM
16b
SCL_Diag
:BLM
17c
SCL_Diag
:BLM
19b
SCL_Diag
:BLM
20c
SCL_Diag
:BLM
22b
SCL_Diag
:BLM
23c
SCL_Diag
:BLM
25b
SCL_Diag
:BLM
26c
SCL_Diag
:BLM
28b
SCL_Diag
:BLM
29c
SCL_Diag
:BLM
31b
SCL_Diag
:BLM
32c
Nor
mal
ized
loss
5% reduction"
10% reduction
15% reduction"
����)��� ������# ����!��%���&%�����������
• 6 �� � � � � ( / � � � �� ( ) � � � � � " � � � " � � �
• � � � � � � � � " �� � � � # ##�� � � � ' & � � � " Q
• - ) � � � ##� � #� �' � � � � ( � � " � ' � � " / � �� �� �
Progressively reduce quadrupole strength along the SCL
32 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
�2%� � ����!� %�������3�!���� �����
• < �' � 7 � � ' � 6 � � � � � � ( / �� � *< 7 6 � ,� " � � � � ��#� �" � �
– 6 � � � � � � � . 6 �� < = � / �� � # � " � / � �� ' � ��( � � � � � � � � ' &
• 6 " � � � � ��#� �" � �
– $ � ) � � � � � ' & �" �� �" � �� @ � � � �� � � � � � � �
33 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
��� ���"��%��
• . � � �' � �� # � � � � ' � � � � � �� '
– - �� % *� � ) ,L� �� % *#� � ,
• � �� % � � / � / � � L� ) � � � / � � ��� � � � ( �� � / � �
– B �� � / � � ( �� � / " " � � � � � �
• - �� % � � � � � � � �� � � � �� � � � � � � �� � � � � � � �
– H � � � � � � � � �� � � � ( ( � ( ) � �� � � � ) � ( � � � � � � � � � � " � �
slower
slow
Beam Position vs. mini-pulse
34 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
�%� � ���
• �$ �R��? & � � � � � � � / � � � � � C� �
• I # � � 3 � & � � � � # � � � � � � �3 ? � � � � � � � " � ) � ��� � 5 � � � ��� � ��� &
• � " � ' � ) �� ' � � �� �
– �" � �� " � � � � � � #� " � ��� � � ( E� � ) � � � � � ' �� � A � @ � � � � / � � � �� � �
– � � � � � � � ) �� � � �� #� � � " � � � ) � � � � ) � ( �( � � @ � � � � �� � � � ��" � � ( *& � ,
• ! � �� � ( � " � � @ � � � �� � � � ) � � � � � � � � � ' �� � � � ( �� � ' � � �� ' �� � / � � #� / ��( �� ' ��� � � ���� ' �� " " �� � � � �� ' � � ( � � � � �� ' � � �' � � ) � � ��� � �
35 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
�%� � �����""
• ����� � � � �( � � �� ' � � � � / � � � �� " " �� � � � �� ' � � ( � � � � � � #� � �' � � ) � � ��� � � � � 1 ' � � � � �#�� �( 2 � � �
SNS: March 2000
It is possible
36 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
4������� �������+��������
• �@ � � � � � / � � @ � � � � (
RFQ resonance error
Injection Dump Loss
3 kHz
Few Watts Beam Loss
7 minutes
Ring Injection Loss correlated with RFQ resonance error
37 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����*������������ ���
Front-End:Produce a 1-msec
long, chopped, H- beam
1 GeV LINAC
Accumulator Ring: Compress 1 msec long pulse to 700
nsec
2.5 MeV
LINACLINACFront-EndFront-End
Accumulator Ring
RTBT
HEBT
Injection Extraction
RF
Collimators
945 ns
1 ms macropulse
Cur
rent
mini-pulse
Chopper system makes gaps
Cur
rent
1ms
Liquid Hg Target
1000 MeV
1 ms macropulse1 ms
38 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name
����������� ����!�����+�����'�����
������ ������� ������
� ��������
�������������� ��� ���� ���� ����
���� ���� ����� � � ���� ���� ����
��������� �!"���#������$ � �$ %�� %��
� �&"'���()#�!"���#������$ � �$ *�� *��
���+� �����,"������ -� %�� �� %�
-.���� �����,"������ -� ���� ��� ���
�����/"'0��'���1��� 0��� ���� ��� ���
)�/��������)�����23� ��� �� ��
4)#�,�.����0 �� �� ��
)���-��"� "'������5"�0 ���� ��6� �6�
���+�)���,"�����-� 6*� 66 �%
)����"��1�7����0��� ��*8���� ��%8���� ���8���%
)���4/����,1���5"���4/��& ���* ���� ����
Recommended