Vacuum windows at JPARC Contents Introduction Vacuum windows at hadron beam line Helium gas cooling...
Transcript of Vacuum windows at JPARC Contents Introduction Vacuum windows at hadron beam line Helium gas cooling...
Vacuum windows at JPARC
Contents•Introduction•Vacuum windows at hadron beam line
Helium gas cooling•Vacuum windows at neutrino beam line
primitive discussion
Yoshikazu Yamada (KEK)T.Ishii, T.Iwashita, M.Minakawa, Y.Oyama, H.Takahashi, et.al.
4th International Workshop on the Neutrino Beams and Instrumentation
November 10, 2003
Hadron & Neutrino beam lines
Neu
trino b
eam lin
e
Had
ron
beam
line
50 GeV PS
Neutrino beam lineSingle turn fast extraction8 bunches in 5s3.3x1014proton/spillCycle: 3.53 sec.
Hadron beam lineSlow extraction: 0.7 sec.Time(sec.)
0.7sec.
Windows in hadron beam line
Fast reaction valve
SY Vacuum window
10-6~10-8 TorrTurbo & Ion pump
10-3 TorrRotary pump
50GeV PS: 10-8 Torr
Vacuum chamber :20cm-, SS or Al or TiConnected by ‘Radial seal’
Window for T1-upstream
Window for T1-downstream
Window for Dump
Container of T1-target(air and water inside)
Beam dump(Low Pressure?)
NP-hall
Switch Yard
SY vacuum window
0.0E+00
2.0E+06
4.0E+06
6.0E+06
8.0E+06
1.0E+07
1.2E+07
0 2 4 6 8 10R (cm)
Dep
osi
t (W
/m3
)
•Separate vacuum in SY(10-3Torr) from one in 50GeV-PS (10-8Torr) •Aluminum : 20cm-, 100m-t•Edge : cooled at 30ºC by water or air•Average deposit: 3.5J/spill Temperature rise : 16(K) (SS: 480(K) )
(MARS+ANSYS)
Radius (cm)
Dep
osit
(W
/m3 )
r ~ 1cm
Aluminum window
+16(K)
Time dependence of temperature
Aluminum Stainless Steel
T>1 min. : T=30 +16 ± 4 (ºC) T>20 min. : T = 30 + 480 ± 10 (ºC)
Time(sec) Time(sec)
CenterCenter
Tem
per
atu
re(º
C)
600 600
30
46
30
300
Tem
per
atu
re(º
C)
Beam window for T1-target
Water
Air
Primary beam line:~10-3 Torr
Vacuum chamber
~10-3 Torr
Upstream windows for T1 diameter:10cm
Downstream windows for T1 diameter:30cm
He1g/cm2
1m/s
He
T1 target
Double wall (SS or Al)•cooled by He flow in gap•gap: ~1cm•remote maintenance
Beam axisSS
SSSS/Al
SS/Al
T1 container
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0 1 2 3 4 5R (cm)
t (c
m)
Upstream window for T1 (T1-U)
0.0E+00
1.0E+08
2.0E+08
3.0E+08
4.0E+08
5.0E+08
0 1 2 3 4 5R (cm)
Dep
osit
(W/m
3)
•Separate vacuum of beam line (10-3Torr) from air(1atm) in T1 container•SS/Al (beam-line side) and SS (T1 side) : 10cm-, variable thickness•Cooled by He(1atm & 1m/s) between two walls•Average deposit:10.2 J/spill on SS window (9.2 J/spill if t=100m)
Radius (cm)
Dep
osit
(W
/m3 )
r ~ 2mm
Radius (cm)
Th
ick
nes
s (c
m)
100m
2.5mmSS window
Temperature of window T1-U
Temperature rise : 320 (K)
Natural convection : 10W/m2/K
Temperature rise : 160 (K)
Forced convection : 100W/m2/K
Outer edge : cooled to be 30ºC by water or airOne surface : cooled by convection by Helium
SS window SS window
+160(K)+320(K)
Deformation/Stress of window T1-U
Deformation:0.7mm@center Max. stress due to pressure :200MPa@center< Tensile strength:500MPaIf t=0.1mm(uniform)
•deformation : 2.1mm•Stress : 310MPa@center,1000MPa@edge
SS window SS window
0.7mm
Helium cooling at KEK-B factory
He
He
Heat transfer coefficient
1g/s (6l/s, 1.7m/s)•120W/m2K(measured by U.Tsukuba)
•164W/m2K(calculation)
•220W/m2K(measured by IHI)
Watercooled
Helium cooled
Aluminum AluminumBeryllium
Double wall of Beryllium
Watercooled
Vacuum chamberfor interaction point
~100W heat
Helium cooling system
He compressor He coolerHe tank water pump
water cooler
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0 5 10 15R (cm)
t (c
m)
Downstream window for T1(T1-D)
0.0E+00
5.0E+07
1.0E+08
1.5E+08
2.0E+08
2.5E+08
0 5 10 15R (cm)
Dep
osit
(W/m
3)
•Separate vacuum chamber (10-3Torr) from air(1atm) in T1 container•SS/Al (beam-line side) and SS (T1 side) : 30cm-, variable thickness•Cooled by He(1atm & 1m/s) between two walls•Average deposit: 1060 J/spill on SS window (115 J/spill if t=0.1mm)
r ~ 5mm
100m
5mm
Radius (cm)
En
ergy
dep
osit
(W
/m3 )
Th
ick
nes
s (c
m)SS window
Radius (cm)
Temperature/stress of window T1-D
Outer edge: cooled to be 80ºCTemperature rise:
170(K) @100W/m2K810(K) @10W/m2K
Deformation:3.3mmStress due to pressure:450MPa at center~Tensile strength 500MPa
SS window SS window
+170(K) 3.3mm
Window for beam dump
0.00E+00
2.00E+05
4.00E+05
6.00E+05
8.00E+05
1.00E+06
1.20E+06
1.40E+06
0 5 10 15 20 25
R (cm)
Depo
sit
(W/m
3)
0.00E+00
1.00E-01
2.00E-01
3.00E-01
4.00E-01
5.00E-01
6.00E-01
0 5 10 15 20 25
R (cm)
t (c
m)
•Separate vacuum in beam line (10-3Torr) from air in beam dump•Stainless Steel : 50cm-, variable thickness•Simple wall or double wall with Helium cooling•Average deposit: 136 J/spill (98 J/spill if thickness is 1mm-t)
Radius (cm) Radius (cm)
Energy deposit on window (W/m3)
r ~ 5cm
Thickness (cm)
1mm
5mm
Temperature/stress of window(dump)
Outer edge: cooled to be 30ºCTemperature rise:
8(K) @100W/m2K64(K) @10W/m2K
Deformation:5.7mmStress due to pressure:200MPa at R=20cm<Tensile strength 500MPa
SS window SS window
+8(K)
Preparation Section
ARC Section(Super conducting)
Final Focusing Section
Windows in neutrino beam line
Target Station
PS vacuum window (?)
•Separate vacuum in PS&ARC&FF(10-6Torr)
from one in 50GeV-PS (10-8Torr)
50GeV PS
TS exit window(?)
TS entrance window
Final focus
Decay volume (Helium)
Helium container
Target Station
0.0E+00
1.0E+07
2.0E+07
3.0E+07
4.0E+07
5.0E+07
0 2 4 6 8 10R (cm)
Dep
osi
t (W
/m3
)
r ~ 6mm (smallest case)
Window in Preparation Section
•Separate vacuum in PS(10-6Torr) from one in 50GeV-PS (10-8Torr) •20cm- Al 26m-t(?) or SS 10m-t(?) (0.01% loss) (realistic?)•Edge : cooled at 30ºC by water or air•Average deposit : 0.68J/spill T : Al:~14(K), SS:~520(K) •But, T by single spill Al:~67(K), SS:~104(K)
•study on thermal stress and durability against heat cycle•study with larger beam size
Al 26m-t
Radius (cm)
Dep
osit
(W
/m3 )
Al 26m-t
+14(K)
0.0E+00
1.0E+07
2.0E+07
3.0E+07
4.0E+07
5.0E+07
6.0E+07
0 0.5 1 1.5 2 2.5
R (cm)
Dep
osi
t (W
/m3
)
r ~ 6mm
Window for entrance of TS
•Separate vacuum in PS(10-6Torr) from He gas (1 atm) in TS •Aluminum : 5cm-、 1mm-t (can be thinner)•Edge : cooled at 30ºC by water or air•Average deposit : 34J/spill T ~18(K)•But, T by single spill 82(K)
•study on thermal stress and durability against heat cycle•double wall and Helium cooling?
Al 1mm-tAl 1mm-t
Radius (cm)
Dep
osit
(W
/m3 )
+18(K)
Summary
•We started to study on windows for 50GeV beam line.•Average temperature rise and deformation/stress by pressure were estimated by MARS+ANSYS
•Conduction cooling for aluminum windows for •Switch Yard of hadron beam line•Preparation Section of neutrino beam line (?)
•Forced convection cooling by helium gas for windows for•Upstream/downstream of T1 target in hadron beam line•Beam dump in hadron beam line•Entrance window of neutrino target station (?)•Exit window of neutrino target station (??)
Plan
•Study of thermal stress and shock wave•Optimization of thickness •Measurement of thermal transfer coefficient of He cooling •Test production of windows and study durability•Design and production of double wall window
with ‘Radial seal flange’ system developed
by Y.Yamanoi et.al.Proton beam
He gasDouble wall
‘Radial seal flange’
Backup
Hadron beam line in Switch-Yard
Fast reaction valve
SY Vacuum window
10-6~10-8 TorrTurbo & Ion pump (every 20m)
10-3 TorrRotary pump (every 20m)
50GeV PS: 10-8 Torr
30m
Vacuum chamber :20cm-, SS or Al or TiConnected by ‘Radial seal’
ゲートバルブビームモニターラジアルシールビーム膜
真空ポンプ
Q19 Q1A
Q1B Q1C Q1D
第2コリメータ第1コリメータ
2003.3.4改訂
S23 S24 S25
S26
Hadron beam line in NP-Hall
Window for T1-upstream
Window for T1-downstream
Window for Dump
10-3 Torr10-3 Torr
Container of T1-target(air and water inside)
10m
Beam dump(Low Pressure?)
22m
Neutrino target station
Iron shield
Helium container
Machine room
Service pit
Stock room for activated parts
11m
33m
Iron shield
Concrete blocks
40t crane
Target & 1st horn
Beam window
2nd horn 3rd horn
Final focus
Decay volume
Concrete
Beam window
Ground level
Baffle
T1 downstream window
•Diameter: ~30cm
•Vacuum side: Aluminum
•Air(T1) side: SS
•0.1mm-t at center
•5mm-t at edge (water cooled)
•Temperature rise of SS window at center
+170ºC (forced convection by He flow(~1m/s) : 100W/m2K)+810ºC (natural convection : 10W/m2K)
Remote maintenance for T1
Maintenance workshould be done at service space
1. Disconnect cables and cooling tubes.
2. Detach vacuum flanges.3. Replace shields with cask.4. Detach shaft, disks and
upper plate, andmove them to stock space.
5. Install new parts with cask.6. Replace cask with shields.7. Connect cables and tubes.
requires remote maintenance tools
shield
motorwater
beam target
beam
Front view Side view
3m
Remote vacuum sealing
Design specification•Inner Diameter: 30cm•Metal sealing•Small leak:~110-10 Pa•m3/s•Remote operation
•Operation time: 1~5 min.•Small force required
Candidate•Mechanical holding (V-block)•Pillow seal•Radial seal (under development)
Prototype of “Radial seal”developed by Y.Yamanoi(KEK) ,M.Tsuchiya(IHI Ltd) andUsui Kokusai Sangyou Kaisya Ltd.
Remote lifting Tools
Lifting tools from CERN and PSI
Magnet
Crane
SpecificationUp to 40tShort heightRemote connectionVideo camera viewingTwo or four points liftingInterlock for one-side lifting
Under design
Neutrino beam line
νμ beam of ~1GeV
Target station
Decay volume
Beamdump
Fast-extracted proton beam line
50GeV PSSuper-Kamiokande
→ x disappearance→ e appearance
Target and secondary beam lines
K1.8
HR
K1.1 K0
Production target : T1 Rotating Nickel disks
•thickness: ~54 mm •radius: ~24 cm•cooled by water•developed by Y.Yamanoi
et. al.
Proton beam NP-Hall