Binping Xiao Aug 20 2015 Cavity overview No coupling slots between cells Beam pipe aperture cell to cell amp end cell 1875 Dimensions cavity radius FPC slot height nose cones etc ID: 183018
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Slide1
2.1GHz cavity without cell-to-cell coupling slots – 1.875” beam pipe
Binping XiaoAug 20 2015Slide2
Cavity overview
No coupling slots between cells.
Beam pipe aperture: cell
to
cell & end cell 1.875”
Dimensions (cavity radius, FPC slot height, nose cones etc) are fine tuned.
A = 1.875”
ASlide3
Center cell
(beta=1)
(beta=1)
h [mm]
Rd [mm]
f [GHz]
Rsh [ohm]
R/Q [ohm]
Q
E-bound f [GHz]
fh-fe[MHz]
1
57.2542.11072.436E+06115.07621168.32.0499460.76256.73322.11072.460E+06118.514207592.0565554.152.556.44552.11072.466E+06120.17520520.12.0597150.99356.14332.11072.462E+06121.70320233.12.0627347.973.555.82782.11072.458E+06123.185199542.0656245.08455.50032.11072.446E+06124.54519642.22.0683842.32554.8152.11072.411E+06126.93618993.22.073537.2Slide4
End cell
aperture:
23.8125
radius in mm
h
2.5
mm
he
0
mm
∆L [mm]
10
(beta=1)(beta=1)r7 [mm]Rd [mm]f [GHz]Rsh [ohm]R/Q [ohm]Q256.24592.11072.715E+06120.83722467.93.556.29812.11072.702E+06120.00922516.3556.35792.110682.686E+06119.07622561.1756.44442.11072.662E+06117.71322613.4r7 blendingSlide5
3-cell
Center cell h = 2.5 mm, cell radius: 55.98 mmEnd cell h = 0 mm with 2 mm blending, cell radius: 54.26 mm
Fundamental mode: 2.11035 GHz, 6.69 M
Ω shunt impedance, power on cavity 9349.1 W.Modes separation: 2.0812 GHz
π/3 mode (+++), 2.0990 GHz 2π/3 mode
(+0-), 2.1105 GHz π mode (+-+).Slide6
Tuner
Lt [mm]
f [GHz]
R/Q [ohm]
Q
Qext
Qtuner
Rsh [Mohm]
QL
Pcavity [W]
Ptuner [W]
0
2.11035314.108521283219892.25E+066.685171210815.19349.188.3-62.10926312.285521516254998.59E+066.719134811669.49301.823.3-32.10964313.30921457240744.37E+066.722671211345.19296.945.732.11151315.091520982191541.21E+066.611249910013.29453.6164.062.11326314.019520511162157.16E+056.4408549055.99703.7277.9Slide7
RF loss
1
2
5
6
7
9
8
11
10
12
13
14,15
17
16
3
4
6
5
14
15
R/Q [ohm]
314.0455
Voltage [V]
250000
Material
Q
Power [W]
standingwave power [W]
1
2.35E+06
84.522105
2
5.00E+07
3.9829437
15.93177
3
4.83E+04
4119.3001
4
8.81E+04
2258.0529
5
3.08E+05
645.81953
6
1.61E+06
123.62762
7
1.52E+07
13.094003
52.37601
8
6.90E+07
2.8847879
11.53915
9
6.89E+07
2.8897306
11.55892
10
5.69E+07
3.4989319
13.99573
11
6.88E+07
2.890654
11.56262
12
6.99E+07
2.8479643
11.39186
13
1.08E+05
1848.9014
14
1.73E+09
0.1151645
0.460658
15
3.61E+08
0.55068
2.20272
16
5.46E+07
3.6439093
14.57564
17
1.55E+08
1.2825659
5.130264
total power
9117.905Slide8
And more
Alumina window RF loss: 5 Watt (1.25 Watt for travelling wave) with 250 kV.Fixed tuner 3/8” dia
, 5mm insertion, frequency increases 0.32
MHz.To compensate the possible Q-degradation brought by surface roughness or brazing. We choose
FPC stub 50mm away from the bottom of the flat area on the "V" waveguide, assuming the cavity is 1cm in thickness, we can use 2.75" flange with 1.625" clearance, and 1.5" bolt with 1"
dia thread and 10mm insertion.
FPC stub position [mm]Qext
QFPCtuner
No
21989
na
50
142942.71E+08Slide9
Summary
For
the 2.1 GHz warm RF system:
3-cell cylindrical cavity with nose cones and
without
coupling slots is designed, and is optimized on shunt impedance. A vacuum pump will be attached to the cavity using a Tee on one of the beam
pipe.Cavity
is fine tuned for field flatness.Cavity
performance at different tuners’ penetrations is evaluated.
To do list:
Error analysis, HOM modes up to 5 GHz, Pickup coupler.