2006/9/1 bl cavity meeting
DESCRIPTION
2006/9/1 BL cavity meeting. (1)STF BL cavity HOM Qext and passband summary (2)TTF cavity HOM Qext and passband summary TTF HOM coupler : SACLY-type , DESY-type K.Watanabe. Comparison the HOM coupler insert length and loop geometry. - PowerPoint PPT PresentationTRANSCRIPT
2006/9/1 BL cavity meeting
(1)STF BL cavity HOM Qext and passband summary
(2)TTF cavity HOM Qext and passband summary
TTF HOM coupler : SACLY-type , DESY-type
K.Watanabe
1st cavity 2nd cavity 3rd cavity 4th cavity
Loop geometry different all cavities.
Comparison the HOM coupler insert lengthand loop geometry
HOM coupler @TTF
ACC#1
module
ACC#2
module
ACC#3
module
ACC#4
module
ACC#5
module
SACLAY
type
1,2,6,7 2,3 8 1,7 -------------
DESY-type 3,4,5,8 1,4,5,6,7,8 1,2,3,4,5,6,7
2,3,4,5,6,8 1,2,3,4,5,6,7,8
Saclay-type DESY-type
1000
104
105
106
107
108
109
0 10 20 30 40 50
BL cavity mode vs Qextwith verticl test @4K
probe gap=6mm※
Qext HOM1+HOM2
Qext HOM1+HOM2
Qext HOM1+HOM2
Qext HOM1+HOM2
Qext HOM1+HOM2
mode
mode:TE111 1-18 TM110 19-36 TM011 37-45
1st2nd
3rd
4th
KEK BL cavity HOM Qext @4K probe gap=6mm
100
1000
104
105
106
107
108
0 10 20 30 40 50
BL cavity mode vs Qext @4K1st and 2nd cavities
Qext HOM1+HOM2
Qext HOM1+HOM2
Qext HOM1+HOM2
mode
1st probe gap=2mm2nd probe gap=1mm
TE111 TM110
TM011
1st
2nd
KEK BL cavity HOM Qext @4K probe gap=1 or 2mm
TM011 の Qext が高い。
TM110-7,8,9 も高い。
100
1000
104
105
106
107
108
0 10 20 30 40 50
TTF_Qext_summaryACC#1module 1to8 cavity
ACC1_#1 cavity
ACC1_#2 cavity
ACC1_#3 cavity
ACC1_#4 cavity
ACC1_#5 cavity
ACC1_#6 cavity
ACC1_#7 cavity
ACC1_#8 cavity
Qext
mode No.
TE111
TM110
TM011
-2
0
2
4
6
8
10
12
0 10 20 30 40 50
BL cavity mode vs delta freq(1st-2 reference)
1st-1 delta f [MHz]
1st-2 delta f [MHz]
1st-3 delta f [MHz]
2nd-1 delta f [MHz]
2nd-2 delta f [MHz]
3rd-1 delta f [MHz]
4th-1 delta f [MHz]
delta f [MHz]
mode
TM110 TM011TE111
50um
30um
Delta f of each cavity :BL cavities
1st cavity の 2 回目の縦測定の時の状態を基準周波数とした。
EP による効果： <2MHz
（研磨量に依存）
空洞ごとのバラツキ： <10MHz
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryACC#1module 1to8 cavity
ACC1_#1 cavity
ACC1_#2 cavity
ACC1_#3 cavity
ACC1_#4 cavity
ACC1_#5 cavity
ACC1_#6 cavity
ACC1_#7 cavity
ACC1_#8 cavity
Qext
mode No.
TE111
TM110
TM011
100
1000
104
105
106
107
0 10 20 30 40 50
BL cavity mode vs freq and Qext_1st_to_4th
Qext HOM1+HOM2 1st
Qext HOM1+HOM2 2nd
Qext HOM1+HOM2 3rd
Qext HOM1+HOM2 4th
Qext HOM1+HOM2
mode
pick-up probe:1st,2nd,3rd diameter=12mm gap=2mm 4th diameter=12mm gap=1mm
mode: 1-18 TE111 19-36 TM110 37-45 TM011
KEK BL cavity and TESLA cavity
TM011 の Qext に大きな違いがある。一桁異なる。
TM011 モードに関しては HOM カプラーの向きが異なっている。
※BL 空洞と TTF 空洞では HOM のフィールドパターンが異なることに注意
Room temp He temp. ??
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryACC#1module 1to8 cavity
ACC1_#1 cavity
ACC1_#2 cavity
ACC1_#3 cavity
ACC1_#4 cavity
ACC1_#5 cavity
ACC1_#6 cavity
ACC1_#7 cavity
ACC1_#8 cavity
Qext
mode No.
TE111
TM110
TM011
TTF ACC#1 module HOM Qext
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryACC#2 module 1to8 cavities
ACC2_#1 cavityACC2_#2 cavityACC2_#3 cavityACC2_#4 cavityACC2_#5 cavityACC2_#6 cavityACC2_#7 cavityACC2_#8 cavity
Qext
mode No.
TE111 TM110TM011
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryACC#3 module 1to 8 cavities
ACC3_#1 cavity
ACC3_#2 cavity
ACC3_#3 cavity
ACC3_#4 cavity
ACC3_#5 cavity
ACC3_#6 cavity
ACC3_#7 cavity
ACC3_#8 cavity
Qext
mode No.
TE111 TM110
TM011
TTF ACC#2,#3 module HOM Qext
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryACC#4 module 1to8 cavities
ACC4_#1 cavity
ACC4_#2 cavity
ACC4_#3 cavity
ACC4_#4 cavity
ACC4_#5 cavity
ACC4_#6 cavity
ACC4_#7 cavity
ACC4_#8 cavity
Qext
mode No.
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryACC#5 module 1to8 cavities
ACC5_#1 cavity
ACC5_#2 cavity
ACC5_#3 cavity
ACC5_#4 cavity
ACC5_#5 cavity
ACC5_#6 cavity
ACC5_#7 cavity
ACC5_#8 cavity
Qext
mode No.
TTF ACC#4,#5 module HOM Qext
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summarySACLAY-type HOM coupler Qext
ACC1_#1 cavity
ACC1_#2 cavity
ACC1_#6 cavity
ACC1_#7 cavity
ACC2_#2 cavity
ACC2_#3 cavity
ACC3_#8 cavity
ACC4_#1 cavity
ACC4_#7 cavity
Qext
mode No.
TE111 TM110
TM011
SACLAY-type vs DESY-type (1)
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryDESY-type HOM coupler Qext(1)
ACC1_#3 cavity
ACC1_#4 cavity
ACC1_#5 cavity
ACC1_#8 cavity
ACC2_#1 cavity
ACC2_#4 cavity
ACC2_#5 cavity
ACC2_#6 cavity
ACC2_#7 cavity
ACC2_#8 cavity
Qext
mode No.
saclay DESY
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryDESY-type HOM coupler Qext(2)
ACC3_#1 cavity
ACC3_#2 cavity
ACC3_#3 cavity
ACC3_#4 cavity
ACC3_#5 cavity
ACC3_#6 cavity
ACC3_#7 cavity
ACC4_#2 cavity
ACC4_#3 cavity
ACC4_#4 cavity
Qext
mode No.
SACLAY-type vs DESY-type (2)
100
1000
104
105
106
107
0 10 20 30 40 50
TTF_Qext_summaryDESY-type HOM coupler Qext(3)
ACC4_#5 cavity
ACC4_#6 cavity
ACC4_#8 cavity
ACC5_#1 cavity
ACC5_#2 cavity
ACC5_#3 cavity
ACC5_#4 cavity
ACC5_#5 cavity
ACC5_#6 cavity
ACC5_#7 cavity
ACC5_#8 cavity
Qext
mode No.
DESYDESY
Delta f of TTF cavities
summary
・ TTF の Nicoleta 氏から TTF ACC#1 ～ ACC#5 module までの HOM のパスバンドと Qext に関する情報を得た。
・ TTF 空洞と BL 空洞の HOM のダンピング能力を比較すると、 TE111 は差が見られないが、 TM110-7,8,9 および TM011 は BL 空洞の方が一桁程度悪い。（※フィールドパターンが異なることに注意）
これは BL 空洞と TTF 空洞の HOM カプラーの取り付け位置の違いから来るものである。
TTF ：ビーム軸に対してループ部が 30° 回転している。
BL 空洞：回転していない。 TM011 モードの磁場と結合しない。
・空洞ごとの HOM の周波数差： <10MHz
1000
104
105
106
107
0 10 20 30 40 50
BL cavity mode vs freq and Qext_1st_to_4th
Qext HOM1+HOM2 1st
Qext HOM1+HOM2 2nd
Qext HOM1+HOM2 3rd
Qext HOM1+HOM2 4th
Qext HOM1+HOM2
mode
pick-up probe:1st,2nd,3rd diameter=12mm gap=2mm 4th diameter=12mm gap=1mm
mode: 1-18 TE111 19-36 TM110 37-45 TM011
1000
104
105
106
107
0 5 10 15
BL cavity mode vs freq and Qext_1st_to_4th
Qext HOM1+HOM2 1st
Qext HOM1+HOM2 2nd
Qext HOM1+HOM2 3rd
Qext HOM1+HOM2 4th
Qext HOM1+HOM2
mode
pick-up probe:1st,2nd,3rd diameter=12mm gap=2mm 4th diameter=12mm gap=1mm
mode: 1-18 TE111 19-36 TM110 37-45 TM011
1000
104
105
106
107
20 22 24 26 28 30 32 34 36
BL cavity mode vs freq and Qext_1st_to_4th
Qext HOM1+HOM2 1st
Qext HOM1+HOM2 2nd
Qext HOM1+HOM2 3rd
Qext HOM1+HOM2 4th
Qext HOM1+HOM2
mode
pick-up probe:1st,2nd,3rd diameter=12mm gap=2mm 4th diameter=12mm gap=1mm
mode: 1-18 TE111 19-36 TM110 37-45 TM011
1000
104
105
106
107
37 38 39 40 41 42 43 44 45
BL cavity mode vs freq and Qext_1st_to_4th
Qext HOM1+HOM2 1st
Qext HOM1+HOM2 2nd
Qext HOM1+HOM2 3rd
Qext HOM1+HOM2 4th
Qext HOM1+HOM2
mode
pick-up probe:1st,2nd,3rd diameter=12mm gap=2mm 4th diameter=12mm gap=1mm
mode: 1-18 TE111 19-36 TM110 37-45 TM011
1.55
1.6
1.65
1.7
1.75
1.8
0 5 10 15
BL cavity mode vs freq @4K
freq[GHz] 1st-1
freq[GHz] 1st-2
freq[GHz] 1st-3
freq[GHz] 2nd-1
freq[GHz] 2nd-2
freq[GHz] 3rd-1
freq[GHz] 4th-1
freq[GHz] 1st-1
mode
1.78
1.8
1.82
1.84
1.86
1.88
1.9
20 22 24 26 28 30 32 34 36
BL cavity mode vs freq @4K
freq[GHz] 1st-1
freq[GHz] 1st-2
freq[GHz] 1st-3
freq[GHz] 2nd-1
freq[GHz] 2nd-2
freq[GHz] 3rd-1
freq[GHz] 4th-1
freq[GHz] 1st-1
mode
2.3
2.32
2.34
2.36
2.38
2.4
2.42
37 38 39 40 41 42 43 44 45
BL cavity mode vs freq @4K
freq[GHz] 1st-1
freq[GHz] 1st-2
freq[GHz] 1st-3
freq[GHz] 2nd-1
freq[GHz] 2nd-2
freq[GHz] 3rd-1
freq[GHz] 4th-1
freq[GHz] 1st-1
mode