rf measurement of t18 after high power test
DESCRIPTION
RF measurement of T18 after High power test. Jiaru Shi 27.07.2011. CERN built T18. Before high power testing. after high power testing. Faya Wang @ SLAC. Faya Wang @ SLAC. Before high power testing. After high power testing. Standing wave pattern Reflection before last regular cell. - PowerPoint PPT PresentationTRANSCRIPT
RF measurement of T18 after High power test
Jiaru Shi27.07.2011
Before high power testing
after high power testing
CERN built T18
Faya Wang @ SLAC
Faya Wang @ SLAC
After high power testingBefore high power testing
Standing wave patternReflection before last regular cell
0.02
0.04
0.06
30
210
60
240
90
270
120
300
150
330
180 0
after
before
Detuning of cells(difference of required tuning)
0 5 10 15 20-3
-2
-1
0
1
2
3
4
5x 10
6
number of cells
df a
fter
hig
h po
wer
tes
ting
(Hz)
Not sure for input matching cell
Amplitude Measurement of T18-SLAC #1 Before and After High Power Test
11421.7 MHz at 21.32°C, N2 Before high Power test
11421.87 MHz at 20.4°C, N2 After high power test
Juwen Wang @ SLAC
1350 hours
11421.7 MHz at 21.32°C, N2 ore high Power test
11421.87 MHz at 20.4°C, N2 After high power test
Phase Measurement of T18-SLAC #1 Before and After High Power Test
Juwen Wang @ SLAC
Amplitude Measurement of TD18-SLAC Before and After High Power Test
11424.5 MHz at 21.46°C, N2 Before high Power test
11424.56 MHz at 21.1°C, N2 After high power test
Juwen Wang @ SLAC
Phase Measurement of TD18-SLAC Before and After High Power Test
16.5°
11424.5 MHz at 21.46°C, N2 ore high Power test
11424.56 MHz at 21.1°C, N2 After high power test
Select bead pulling frequencies based on the same measurement condition for both before and after high power test
Juwen Wang @ SLAC
Amplitude Measurement of T18-SLAC #1 Before and After High Power Test
11424.1 MHz at 20.02°C, N2 Before high Power test
11424.15 MHz at 20.4°C, N2 After high power test
T24Juwen Wang @ SLAC
Phase Measurement of T24-SLAC Before and After 800 Hours High Power Test
Select bead pulling frequencies based on the measurement condition to get 2π/3 phase advance for both before and after high power test
6º
11424.1 MHz at 21.1°C, N2 After high Power test
11424.1 MHz at 21.2°C, N2 Before high power test
Juwen Wang @ SLAC
T18 SLAC N1 TD18 SLAC T24 SLAC T18 CERN N2
Measured at SLAC SLAC SLAC CERN
Output matching
Standing Wave(SWR)
1.06 1.2 1.05 1.1
(reflection) 0.03, -30dB 0.1,-20dB 0.025, -32dB 0.05, -26dB
Estimate df if only one cell detuned
2MHz 7MHz 2.5MHz 3MHz
from standing wave pattern
N-1 cell-F
N-1 cell-F
Output cell+F
N-1 cell -F
Regular cells
Total phase shift -16 deg +6 deg
~df +1 MHz -0.3 MHz
TD18 Chamfer100 um -1MHz
Chamfer TD18
20.00 40.00 60.00 80.00 100.00r_chamfer [um]
-0.13
0.00
0.13
0.25
0.38
0.50
0.63
0.75
(re
(Mo
de
(1))
-11
42
5M
Hz)
/1M
Hz
Ansoft LLC f0XY Plot 2 ANSOFT
Curve Info
(re(Mode(1))-11425MHz)/1MHzSetup1 : LastAdaptive
T18 chamfer100 um -0.5MHz
10.00 30.00 50.00 70.00 90.00r_chamfer [um]
0.05
0.15
0.25
0.35
0.45
0.50
(re
(Mo
de
(1))
-11
42
4M
Hz)
/1M
Hz
Ansoft LLC cell_1XY Plot 1 ANSOFT
Curve Info
(re(Mode(1))-11424MHz)/1MHzSetup1 : LastAdaptive
TD18 Iris ellipse aspect ratio 1.1 to 1.2frequency + 8.2MHz
1.100 1.120 1.140 1.160 1.180 1.200e
-6.00
-4.75
-3.50
-2.25
-1.00
0.25
1.50
2.75
(re
(Mo
de
(1))
-11
42
4M
Hz)
/1M
Hz
Ansoft LLC f0XY Plot 2 ANSOFT
Curve Info
(re(Mode(1))-11424MHz)/1MHzSetup1 : LastAdaptive
0 0.5 1
3
3.5
4
4.5
z (mm)
r (m
m)
1.1
1.2
aspect ratio
+1MHz ~ removing 0.12mm3 copper at the iris