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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Tutorial on Tutorial on Cavity Preparation Cavity Preparation
SRF 2007 Workshop Beijing SRF 2007 Workshop Beijing
A.MatheisenA.Matheisen
DESY HamburgDESY Hamburg
Dep.MKS3Dep.MKS3
E mail E mail [email protected]@desy.de
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Subtitle how to come from a Niobium Cavity
to a super conducting resonator
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Some background information to understand what is the difference ?
1) Surface preparation methods
2) Infrastructure for Cavity preparation
3) Handling and Know how on cavity preparation
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
1) Surface preparation methods
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Virtual micro cut of a Niobium sheet
Niob purity 99.9999999
Niob Oxides Nb2O5 + NbOx + NbNb2O5 + NbOx + Nb + C + CH + Fe +++++
“Damage layer”~100 µm thick
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Removal of “damage” layer
Method's
Mechanically byGrinding barrel polishing (tumbling)
Chemically bychemical etching ( buffered chemical polishing [BCP])Chemical polishing ( electro polishing [ EP])+ + different new solution under development For instance
see EU JARY1 program WP 5Accel / PoligradElectro bright
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Grinding+ Simple handling
+ low cost standard mechanic
+ Mostly in use for removal of local defects non uniform abrasion !
- Abrasives need to be qualified on s.c. Cavties!!
- Remain of C; Si ; glue; scratch size
- Produces a new damage layer of about 40 µm thickness!!!
Mechanical removal of damage layer
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Removal: Non uniform contact pressure
For optimum removal you need to design machines that make use of centrifugal forces to uniform the forces(Complicated design)
Material :”Stones” made in different shape and material
Application: Global Effect: Smoothening and removal of local
enhancement (Sparcs from EB welding weld in area)
Tumbling
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Example of a tumbling machine Designed an manufactured by DESY group MPL Waldemar Singer
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Chemical removal of “demage” layerTwo types chemical removal are most commonly in use
BCPBuffered chemical polishing
(Mixture of Hydrofluoric acid; Nitric acid and Phosphoric acid)
EPElectropolishing
(Mixture of Hydrofluoric acid and Sulfuric acid)
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Receipt:
BCP AcidMixed by volume from
1:1 HF(49%) /HNO3(70%)to (1:1:2 HF(49%):HNO3(70%) :H3PO485%)
removal rate 1:1 at 20C >20 µm/min Removal Rate1:1:2 t 20 C 1µm/min
Mixture is self exiting ! Spontaneous reaction with Nb!!
EP AcidMixed by volume from
1:8 HF(45%) /H2SO4 (96%) to 1:10 (HF( 45%)/H2SO4 (96%)(+ H2O due to hygroscopic reaction of H2SO4!)
removal rate with 17 V applied 1:9 at 20C 0,3-0,5 µm/min1:10 a t 20 C 0,3 – 0,4 µm/min
No reaction on Niobium without voltage applied!
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Niob purity 99.9999999
Niob Oxid Nb2O5 + XXX
Niob Oxid Nb2O5 +XXX
+HF
Niob Purity 99.9999999
Oxidizer
Niob Reinst 99.9999999
Niob Oxid Nb2O5
Niob Oxid Nb2O5
Removal of niobium by chemical reactions
Nb2O5 +HF H2NbOF2+NbO2F
[H2SO4 + voltage = EP ]or [HNO3 = BCP]
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Chemistry
BCP ( buffered chemical polishing )Mixture by volume 1/1/2 HF/HNO3/H3PO4
EP (electro chemical polishing)Mixture by volume 1/9 HF/H2SO4
−++⇒−+ eNOONbNONb 52
5523
52
OHunl鰏lOHFNbOl鰏lNbOFHHFONb 2225252 5.1.)(5.0.)(6 +•+⇒+
OHNbOFHHFOHFNbO 25222 5.145.0 +⇒+•
OHunl鰏lOHFNbOl鰏lNbOFHHFONb 2225252 5.1.)(5.0.)(6 +•+⇒+
−−+− +++⇒++ eSOHONbOHSONb 10510552 24522
24
OHNbOFHHFOHFNbO 25222 5.145.0 +⇒+•
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
2) Infrastructure for Cavity Preparation
Super conduction surface will be covered by normal conducting material after standard wet surface treatments
(residues from chemical reaction and particulates)
• Large areas of n. c. Material reduce the Q value • Particulates are origin of field emission
Need of particle and residue free surface cleaning; Ultra pure water (UPW)particle free storage and working atmosphere (Cleanroom)and particle fee handling adapted tools and processes
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Particulates on surfacesAre there
Typical materials?Non ! All air born substances of the world perform particulates
Typical size? No! Every size from ideal ball geometry to multi complex geometries
Common behavior?Yes !transportation in air make them flow every wherewell know forces making them stick on surfaces
Other sources of particles and particle motionMechanical vibration
** Hitting, banging, “tapping”(tightening bolts with wrench!!!)** Closing a valve quickly
Thermal cycling. One cannot avoid cycling to 2 K! Particles can be dislodged by thermal stress differences.
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Overview talk of John O’[email protected]
Example:Particles found in Tristan reactor:
Environment (rock, concrete, paint)Aluminum alloys (6063, 2219)Pumps: Ion—TiO, TiN; NEG—ZrO
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Forces that make attractive potential to particulates facing a surface
g2
F= -------------16 π εo h2
Q
- Q
Diameter d
Zoh
Coulomb forces
dF~ -------------
Zo 2
Diameter d
Zoh
Van der Waals forces
d (ΦW1- ΦW2)2
F~ -------------Zo
Diameter d
Zo
Electrostatic forces
ΦW1
ΦW2
F~ d
Diameter d
Zoh
Knudsen forces
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Ultrasonic cleaningDischarge of static loads Ionized Gases (air N2)Reduce surface tension Alcohol / Detergents Rinsing High Pressure Rinsing Enforced gas flow air guns (N2 ; Ar)
How to introduce forces (energy) to the particles on a surface ?
Problem speed on surface = 0
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
But what to do when particulates already rest rest on a superconduction surface?
Particle Diameter
Force
Removal Force
Attractive Force
Apply forces larger than the active ones (static; v.d. Waals etc.) to remove them
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Surface cleaning with sound waves in ultra pure water
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Preparation of flange surface:a) - 20 Min US cleaning within DESY US basin
- Automatic rinsing with DESY UPW rinsing basin (R >= 12 MOhmcm)- Drying in class 100
b) - cleaning with hand held megasonic cell®2 at optimizeddistance of 20 cm between Object and Cell (Nozzle) Drying in class 100
c) - 20 Min US cleaning within DESY US basin- Automatic rinsing with DESY UPW rinsing basin (R >= 12 MOhmcm)- Drying in class 100Blowing of surface by ionized nitrogen of the pulsed gun
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Surface scanning to measure particle concentrations on surfaces
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
0
10
20
30
40
50
60
0.3 µm 0.5 µm 1.0 µm 3.0 µm 5.0 µm 10.0 µmparticle size [µm]
cou
nts
ultrasonic cleaning/fine rinsing
SONOSYS Megasonic
SONOSYS Megasonic
ultrasonic cleaning/fine rinsing,blown off with nitrogen
Studies on most efficient cleaning
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Which particles do we find in our normal air ? ?
( Particle size ) [µm]
Particulates in the air
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Particulates in air
F=ma ~ d3
Diameter d
Gravitational forces
F ~ V Ao ρ cw
Diameter d
Flow induced forces
Ao
v
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Example fro Settling velocity for particles Gas :Air Temperature = room temperatureElectric fields: non airflow: not enforced (normal air)
Overview talk of John O’[email protected]
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
For super conduction cavities clean water and cleanroom technologyis required to prevent air born particulates from settlement on surfaces
Basics of cleanroom technology
Filter membrane
Cleaned media
Object in clean environment
Boarder to normal areas
MediaGas /liquid
Exit of media (used for process control
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Fan units
Hepa Filter Hepa filter ::
Perforated cleanroom floor
Fresh air
Exit of air for air exchange
Advanced Systemrecirculate90 % of the filtered air
Air velocity 0,35 –o,5 m/secAir flow laminar from cl 100 on
Basic function of a cleanroom
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
One major part inside a cleanroom is PERSONAL
1st Dress code
Sta
ndsi
t
Mov
e sl
ow
fast
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Behavior of personal inside a cleanroom
Wrong !!!! Right !!!
3) Handling and know how on cavity preparation
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Open the door But right !
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Be careful where your hands and your body is close to an open cavity
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Quality control during cavity preparation
1) Air; gasses; liquids2) surfaces3) Flow pattern4) Degreasing and rinsing
But from where do we know that all this technology works as designed?
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Schematic of particle counters
Air; gasses; liquids
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Some example on particle detection in ultra pure water
0
20
40
60
80
100
120
140
160
180
1 27 53 79 105 131 157 183 209 235 261 287 313 339 365# of cycles (1 cycle = 10 min)
coun
ts
0,21 µm 0,29 µm
0,51 µm 0,6 µm
0,75 µm 1,0 µm
2,0 µm 5,0 µm
0
100
200
300
400
500
600
700
1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85
# of cycles (1 cycle = 10 min)
coun
ts
0,21 µm 0,29 µm 0,51 µm 0,6 µm
0,75 µm 1,0 µm 2,0 µm 5,0 µm
Particles found after installation of a new filter to the HPR stand, total sampling time 16 hours
Particle concentration of the HPR filter after 72 h of rinsing
Air; gasses; liquids
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Behind filterBehind filter
2020-- 10010011--3311--55R = 18,2R = 18,2<=1<=1UV lightUV light
Behind filterBehind filter
2020--100100<10<1011--55R = 18,2R = 18,2<=1<=1Ion exchanger / Ion exchanger /
PolisherPolisher
11--33
11--33
< 10< 10
<10<10
Not Not defineddefined
TOCTOC
[ppb][ppb]
Not definedNot defined>= 100>= 100
( @DESY tap ( @DESY tap connection )connection )
<< 0,0001<< 0,000177--1010Tap waterTap water
<=1<=1
<=1<=1
<=1<=1
<=1<=1
hardness hardness [Deutsche [Deutsche HHäärte]rte]
ParticulatesParticulates[Counts [Counts
>0,3 >0,3 µµm/ liter]m/ liter]
Bacteria colonies Bacteria colonies [per liter] [per liter]
RestitvityRestitvity
[Mohm [Mohm cm]cm]
unitunit
Behind filterBehind filter
2020-- 10010011--55R = 18,2R = 18,2UV lightUV light
Point of use Point of use filtrationfiltration
Reverse Reverse osmosisosmosis
Decalcification of Decalcification of tap watertap water
<=10<=1011--55R = 18,2R = 18,2
Not definedNot defined5050--100100R<= 0,2R<= 0,2
Not definedNot defined5050--100100<< 0,0001<< 0,0001
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Particle detection on rinsing water of the HPR system
Air; gasses; liquids
HPR ejection nozzles and QC funnel Particle filter <=2 µm in HPR draining line
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Scanning microscope for particle filter counting and visual analysis
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
0
5
10
15
20
25
30
1 41 81 121 161 201 241 281 321 361 401 441 481 521 561 601 641 681 721 761
cycles
size
TOC [ppb]resitivitytemp °C
Monitoring of the total oxydable carbon (TOC ) in ultra pure water
Air; gasses; liquids
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
TOC-Meßwerte vor RWA Shut down am 20. Januar 2005, ca. 14:00
0
20
40
60
80
100
120
140
10. Jan. 05 11. Jan. 05 12. Jan. 05 13. Jan. 05 14. Jan. 05 15. Jan. 05 16. Jan. 05 17. Jan. 05 18. Jan. 05 19. Jan. 05 20. Jan. 05
Anzeigedatum des Meßgerätes
Grö
ße
des
Meß
wer
tes
[pp
b T
OC
]
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Example on bacteria contamination in one of the two reverse osmosis unit of the cleanwater plant
RO 400 offRO 1000 on
RO 400 on RO1000 off
RO 400 offRO 1000 on
Air; gasses; liquids
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Quality control on particulates removed from a surface by ionized air (top gun)
Air; gasses; liquids
QC of washers before installation to a cavity
QC of studs before installation to a cavity
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Quality control on particle concentration on surfaces
surfaces
Air particle counter modified for measurement on surfaces
Particle detection on a cleanroom wall
Particle detection on a cleanroom tableParticle detection on a
cleanroom overall
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Instrument : modified Air Particle CounterAdd on surface instrumentation: designed by CCI von Kahlden GmbH ®1
Definition of particle density on surfaceParticle density : P= C/A [counts per cm2]
Static application : P= C/ A counts / (π d2)/4Dynamic application: P=C/Ax
Scanned surface: Ax= A1 +A2A1=(π d2)/4 [mm2]A2= W*d [mm2]
Sampler speed: V= W/ t1setting of counter: Sampling time t [sec]Dynamic application: P=Ct / (V*t1*d+ 1964)
Sampler width: d (50 mm)
Driving way W (cm)
T0=0 t1
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
0
100
200
300
400
500
600
700
800
900
1 2 3 4counter cycle No
coun
ts (
com
mul
ativ
e N
um
ber)
tablewallcleanroom-clothes
Particle concentration on:Table = 67,3 [Particles/mm2]Wall = 11,5 [Particles/mm2]Cleanroom overall = 17,4 [Particles/mm2]
related numbers of particle density
surfaces
Counter display
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 Flow pattern
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Degreasing and Rinsing
Test on cleaning procedure/ detergentNb sample polluted with grease and oil
After Ultrasonic cleaning with sufficient detergent and procedure
Not efficient cleaning
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
New method to control the High pressure rinsing jet (INFN Milano)
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
One example of Cavity preparationPreparation of superconducting cavities at DESY
Cavies arrive from Industry and have undergone in comming inspectionAfter thatA) Main EP
1) Degreasing and rinsing 2) Prepare for EP3) EP treatment4) Clean cavity and rinse for cleanroom5) out side etching for 800 C annealing6) 800 C annealing 7) Tuning for vertical test
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Ultra sonic rinsing (up to 4KW Power )Rinsing by ultra pure water
Degreasing and rinsing
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Degreasing and rinsing
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Degreasing and rinsing
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 Prepare for EP
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
EP treatment
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Cavity installed in electro polishing apparatus
1) EP treatment
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Ep apparatusduring draining of acid
EP treatment
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 800 C annealing
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 Tuning for vertical test
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
After that
B) Preparation for vertical test at 2K
1) “Car wash”2) Degreasing and rinsing 2a) Prepare for EP and EP treatment2b) or BCP treatment4) Rinsing and 1st high pressure rinsing5) Drying in class 10 (ASTM) 6) Assembly of accessories7) Alcohol rinsing8) Six times high pressure rinsing9) Drying in class 10 (ASTM)
10) Assembly of test antenna 11) 120 C baking
vertical test
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
“Car wash”
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Prepare for EP and EP treatment
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Cavity installed in BCP bench(Buffered chemical polishing
or BCP treatment
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Valve box for BCP treatment
Säure!!!
or BCP treatment
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
Rinsing and 1st high pressure rinsing
View into class 10000 cleanroom“Wet preparation area”
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 Drying in class 10 (ASTM)
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 Assembly of accessories
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 Alcohol rinsing
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007 Six times high pressure rinsing
HPR Stand inside the claenroom
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
120 C baking
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
If ever things!!!! works perfect you will get
![Page 76: Tutorial on Cavity Preparation SRF 2007 Workshop Beijing · Cavity Preparation SRF 2007 Workshop Beijing A.Matheisen DESY Hamburg ... Drying in class 100 c) - 20 Min US cleaning within](https://reader034.vdocuments.site/reader034/viewer/2022042811/5fa75206df687c45ad43cf97/html5/thumbnails/76.jpg)
A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
From vertical test to module( Shortened version there are more steps than shown here necessary
Back to clean roomInstall FEM (in sito bead pull measurement)Tank weldingRemove FEMInstall AntennasHigh pressure rinse cavityInstall power couplerAssemble of module
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
1) Cavity assembly for vessel weld
Requirements to the FMS:• Cleanroom class ISO 4 (ASTM: RK10)• Protect inner surface of cavity from ambient air• No desorption from FMS (Teflon tube and clamping system)• Vacuum tightness
Cavity with FMS, Teflon tube on cavity axis
Cavity short end groupCavity long end group
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
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A.Matheisen SRF workshop 2007 A.Matheisen SRF workshop 2007 Bejing China October 2007 Bejing China October 2007
谢谢大家谢谢大家
会议愉快会议愉快