Transcript MHI#8号機の4回目の表面処理工程 と 低電流密度EPの状況

HIT#2号機のPre-EPとEP1
 Process log
 Status of working
 Monitor data during EP & Rinsing process
 Comparison of EP1
Period : 2012/3/9 ~ 3/15
Process : Pre-EP(5μm, <40℃), EP1(100μm, 50mA/cm2),
Normal 1st Water Rinsing [1hour], Degreasing (FM-20, 2%) [0.5hour],
HPR [1 hour]
Preparation :Attachment to jigs
Workers : M. Sawabe, Kirk (KEK),
K. Nakamura, F. Tsukada, T Kitajima (Assist Engineering Co.),
T. Watanuki (HITACHI Co. Ltd.)
STF Cavity Group Meeting
@2012/3/26
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Kirk
Condition of EP & Rinsing
• EP acid (2/24のサンプルを使用)
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Nb ingredient : >11.0g/ℓ（推定値）
HF ingredient : ? g/ℓ (全体61.5g/ℓの65%が反応に使われる)
Al ingredient : ? mg/ℓ
Current density : ～50mA/cm2 (EP1の時は通常の電流密度で行う)
Cavity surface temperature : <40℃
Control Voltage : 温度と電流密度を見ながら制御
Water mist blowing around upstream beampipe
With normal N2 gas flow during extracting EP acid (8ℓ/min)
• 1st water rinsing (1 hour)
• 10min (storing)/3min (flushing)で行う
• Degreasing (30 min)
• FM-20 (2%)
• HPR (1 hour)
• 60min (4 turns, w/o blind flanges)
STF Cavity Group Meeting
@2012/3/26
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Process log ①
3/9
15:00 HIT#2 is moved to EP area
Check every flange
Polish every flange
3/12
9:10 Check every flange
Some cracks on beampipe at input port
9:20 Attachment of jigs for EP
10:30 Set cavity to EP bed with crane
10:50 Installation of cathode bar to cavity [O.K.]
11:08 Meeting for tomorrow’s working procedure
13:30 EP preparation ready
STF Cavity Group Meeting
@2012/3/26
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Process log ②
3/13
9:23
9:28
10:01
10:52
11:12
11:26
12:41
13:00
13:16
13:36
14:22
Cavity rotation starts
EP acid flow starts
Pre-EP starts
Pre-EP stops [0h51m] / Idling rotation (3 rpm / 20min) / Plastic case detachment
Idling rotation stops
EP acid is removed from cavity with N2 gas flow(0.020MPa)
First rinsing with ultra pure water starts
First rinsing with ultra pure water stops [1h00m]
Detachment of restriction jigs / Data logger detached
Un-installation of cathode bar from cavity / washing cathode bar (Sulfur exists!)
Shower rinsing @CP area
Set to EP bed
EP1 ready
STF Cavity Group Meeting
@2012/3/26
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Process log ③
3/14
8:32
8:37
9:00
13:30
13:50
14:00
15:00
17:15
17:20
17:25
18:30
18:35
3/15
9:00
Cavity rotation starts
EP acid flow starts
EP1 starts
EP1 stops [4h30m] / Idling rotation (3 rpm / 20min) / Plastic case detachment
Idling rotation stops
EP acid is removed from cavity with N2 gas flow(0.020MPa)
First rinsing with ultra pure water starts
First rinsing with ultra pure water stops [1h00m]
Detachment of restriction jigs / Data logger detached
Un-installation of cathode bar from cavity / washing cathode bar (Sulfur exists!)
transferring cavity from EP bed to wagon
Detachment of jigs for EP / Detaching every blind flange of teflon
/ Checking inside cavity (No mark) / Checking teflon surface (No mark)
Shower rinsing @CP area / Checking inside cavity (Sulfur smell)
Degreasing starts (FM-20, 2%) [30min]
Degreasing finishes
Transferring cavity from wagon on turntable for HPR using crane
Checking tolerance between position of nozzle and center of beam pipe
HPR for inside cavity starts
HPR for inside cavity stops [0h54m]
fin
move HIT#2 to inspection room
STF Cavity Group Meeting
@2012/3/26
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Status of Pre-EP for HIT#2 ①
Tcavity
current
voltage
Treservoir
Troom
Tcavity
Pre-EP中は空洞内液温を４０℃以下に
するため、電圧制御を行う。
average current density
STF Cavity Group Meeting
@2012/3/26
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Status of Pre-EP for HIT#2 ②
左図は平均電流密度と電圧の相関
右図は定常状態での分布
STF Cavity Group Meeting
@2012/3/26
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Status of UWR for HIT#2
STF Cavity Group Meeting
@2012/3/26
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Status of EP1 for HIT#2 ①
current
Tcavity
voltage
Treservoir
Troom
average current density
EP1の場合は通常通り50mA/cm2で行う。
途中で１回ジャンプしているのは、
電圧を20V前後で調整していたことによる。
Tcavity
STF Cavity Group Meeting
@2012/3/26
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Status of EP1 for HIT#2 ②
左図は平均電流密度と電圧の相関
右図は定常状態での分布
STF Cavity Group Meeting
@2012/3/26
10
最近のEP1の定常状態の比較
Cavity
Mean temp. [℃]
R.M.S. temp. [℃]
Mean i [mA/cm2]
R.M.S. i [mA/cm2]
MHI#14 1st
30.9
0.5
47.0
1.7
MHI#15 1st
30.9
0.8
47.2
1.5
MHI#16 1st
32.8
1.2
46.3
1.5
MHI#17 1st
33.0
0.7
46.6
1.9
MHI#14 2nd
33.3
0.2
46.9
1.1
EP液交換
MHI#18 1st
36.3
1.2
46.7
2.4
MHI#19 1st
34.0
0.7
46.4
2.4
MHI#15 2nd
35.0
0.4
46.1
2.5
MHI#16 2nd
35.5
0.5
46.1
2.4
MHI#20 1st
32.1
0.8
46.3
2.3
TOS#2 1st
33.0
0.4
46.2
2.1
MHI#21 1st
33.9
0.6
47.6
2.0
MHI#22 1st
35.4
0.6
46.9
1.6
MHI#15 3rd
32.5
1.2
42.1
2.9
HIT#2 1st
33.4
0.4
48.1
2.0
MHI#17のEP1の結果はドリフトの効果が大きい。
MHI#18以降はEP液が新しくなったため、振れ幅が大きい。
MHI#15号機の３回目のEP1はドリフトの効果が大きい。
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Status of EP1 for HIT#2 ③
EP1の間の空洞表面温度の状況。
#1
#2
#3
#4
#5
#6
#7
#8
#9 #10
#11
#12
STF Cavity Group Meeting
@2012/3/26
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Status of EP1 for HIT#2 ④
EP1の間の空洞表面温度の状況（前ページの最後の拡大図）。
#1
#2
#3
#4
#5
#6
#7
#8
#9 #10
#11
#12
STF Cavity Group Meeting
@2012/3/26
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Status of UWR for HIT#2 ①
#1
#2
#3
#4
#5
#6
#7
#8
#9 #10
#11
#12
STF Cavity Group Meeting
@2012/3/26
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Status of UWR for HIT#2 ②
一次洗浄中の空洞温度の状況（前ページの拡大図）
#1
#2
#3
#4
#5
#6
#7
#8
#9 #10
#11
#12
STF Cavity Group Meeting
@2012/3/26
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Status of UWR for HIT#2 ③
STF Cavity Group Meeting
@2012/3/26
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Status of HPR for HIT#2
STF Cavity Group Meeting
@2012/3/26
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アニールへ
３／１９～３／２６
※3/29より内面検査実施予定、その後プリチューニングを行う
STF Cavity Group Meeting
@2012/3/26
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