test team LCLSII SRF weekly 25 Oct 2016 Coupler diagnostics 10312016 Presenter Presentation Title 2 HTS pCM Cernox 5K 8 PT100 at CF100 16 RTD on WG IR warm ceram 8 ID: 723898
Download Presentation The PPT/PDF document "pCM : couplers heating FNAL" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
pCM: couplers heating
FNAL
test
team
LCLS-II SRF weekly
25 Oct. 2016Slide2
Coupler diagnostics10/31/2016Presenter | Presentation Title
2
HTS
pCM
Cernox
-5K (8)
PT100 at CF100 (16)
RTD on WG
IR – warm
ceram
(8)IR – inner conduct (4)Cernox on cavity beampipe (FPC side)
Cernox
PT100
RTDSlide3
Locations of T-sensors10/31/2016Presenter | Presentation Title
3
Cernox
on FPC 5K tube
Cernox
on cavity
beampipe
PT100 on CF100 flange (50K)Slide4
Status of coupler testing at pCM10/31/2016Presenter | Presentation Title
4
Couplers #1 thru #7 were processed at room temperature
at power 2.5 – 4 kW
Coupler #8 was processed at cold with cavity OFF-resonance at 4kW
All couplers are tested at cold (2.1K) at power level 3.5kW and 3.2 kW (~12-20
hrs
)
QL =1.e7 (to keep cavity gradient < 15 MV/m)
Max cavity gradient 12 MV/mSlide5
Heating of CF100 flange (50K) vs. coupler power (cavity on resonance); Cavities 1-4
10/31/2016
Presenter | Presentation Title
5
#2
#1
#3
#4
Power (W)
T
CF100
(K)
Interlock=200K
Coupl#4 -
maxTSlide6
10/31/2016Presenter | Presentation Title6
Heating of CF100 flange vs. coupler power (cavity on resonance); Couplers# 5; 6; 7
#6
#5
#7
RF power
Temp of CF100 (50K)Slide7
Coupler #8:10/31/2016Presenter | Presentation Title
7
RF power
E
acc
Coupler pressure
w
arm part
T_CF100
Warm ceramics
T_IR(inner
cond
)
TCF100=218K
T5K=T
IR_in =70C=342KTIR_ceram
= 53 CTWG = 41 C
T
WGSlide8
Coupler #4. Power = 3.5 kW10/31/2016
Presenter | Presentation Title
8
Fit (brown)
Interpolation to equilibrium:
Slide9
Coupler#3: Power =3.5kW & 3.2 kW10/31/2016Presenter | Presentation Title
9
Fit (red)
Fit (red)
Slide10
Coupler#5. Power=3.5kW10/31/2016
Presenter | Presentation Title
10
Fit (brown)
Slide11
Summary of CF flange heating (preliminary)10/31/2016Presenter | Presentation Title
11Slide12
Temperature on 5K coupler intercept: Couplers 1; 2; 3; 410/31/2016Presenter | Presentation Title
12
#2
#1
#3
#4Slide13
Temperature of 5K coupler intercept: Couplers 5, 6, 710/31/2016
Presenter | Presentation Title
13
#6
#5
#7
RF power
Temp near 5K interceptSlide14
Temperature at 5K interconnection (preliminary)10/31/2016
Presenter | Presentation Title
14Slide15
Inner conductor temperature (Infrared on coupler #2;4;6;8)10/31/2016Presenter | Presentation Title
15
Spec: <450K
T
max
~ 360KSlide16
Temperature of warm window (ceramic): couplers #1-410/31/2016Presenter | Presentation Title
16Slide17
Temperature of warm ceramics (Couplers #5; 6; 7)
10/31/2016
Presenter | Presentation Title
17
T
ceramic
(C
) = 20+10*Power(kW)Slide18
Temperature of WG-Coax flange10/31/2016Presenter | Presentation Title
18
Tmax
=44 CSlide19
50K
thermal
intercept improvements in production
CM
(vs.
pCM
)
10/31/2016
Presenter | Presentation Title
19
pCM
Production CM
XFEL design of CF100 flange to improve thermal contact between Aluminum can and flange
Thermal strap is connected to 50K pipe (closer)
Better thermal contact between braid and copper extension (flat surfaces)
JLAB
pCM
already has this feature
A
cceptable Temp at CF100 ? (200
250K)
50K
5K
Thermal analysis of
pCM
(NE-EO-2015-004) – Fischer/ANLSlide20
LCLS-II Power
reqs
: forward, reflected & total power
.
RF Power vs. Beam current
:
16MV/m; Q
L
=4e7;
Δ
Fpk
=10 Hz
Forward
TotalReflected
0.1 mA
0.3 mA
16MV/m
3.2 / 4.6
5.7 / 6.4
0.1 mA
0.3 mA
16MV/m
3.2 / 4.6
5.7 / 6.4
Q
L
=4.e7
;
detuning
Δ
F=10Hz
E= 16 MV/m; 0.3mA; QL=4e7
Average
=5.7kW
=6.4kW
Coupler heating power ~
P
t
Temp distribution depends on phase of reflection.
In
pCM
tests: P
t
=7 kW (=2·P
f
)Slide21
21SummaryProcurement CM Final Review, May 12-14, 2015
7 couplers out of 8 were tested at 3.2 and 3.5 kW (>12hrs)
Max temperature at CF100 flange ~ 220K at 3.5 kW (coupler #4)
No overheating of cavity
beampipe
small effect on Q0 ? (will be verified in next tests at 2K)Slide22
Back-up slides10/31/2016Presenter | Presentation Title
22Slide23
HTS results10/31/2016Presenter | Presentation Title
23Slide24
Power
50K
5K
IR
IR HTS
50K HTS
5K HTS
Cavity 1
2.78
60.5
28
Cavity 2
3
64.4
29.3
66
Cavity 3
Cavity 4
2.44
60.5
29.5
63
Cavity 5
2.87
61.5
30.7
Cavity 6
1.75
46.5
26.2
Cavity 7
2.29
51.2
26.9
HTS
5
83
47
31
HTS
6
127
80
42
HTS data are lower than projected data from
pCM
results.
Coupler Room Temperature processingSlide25
10/31/201625Slide26
10/31/201626