mhi#14 号機の2回目の ep2
DESCRIPTION
MHI#14 号機の2回目の EP2. Period : 2011/2/8 ~ 2/14 Process : CP @flanges, EP2(20 μ m) under low current density, Improved 1 st Water Rinsing, Brushing @HOM & Flange using FM-20 , Degreasing(FM-20, 2%) [1hour] , Brushing @Flange, HPR x 2 [10 hours] , Assembly in C.R., Vacuum evacuation, - PowerPoint PPT PresentationTRANSCRIPT
MHI#14号機の2回目のEP2 Process log
Status of working Monitor data during EP & Rinsing process Comparison of EP2
Period : 2011/2/8 ~ 2/14Process : CP @flanges, EP2(20μm) under low current density, Improved 1st Water Rinsing,
Brushing @HOM & Flange using FM-20, Degreasing(FM-20, 2%) [1hour],Brushing @Flange, HPR x 2 [10 hours], Assembly in C.R., Vacuum evacuation,Leak check, Baking @100℃ (48hours)
Preparation : Washing vacuum components with ultrasonic, Cleaning in C.R.Workers : M. Sawabe, Kirk, M. Satoh (KEK),
K. Nakamura, N. Tasaki, F. Tsukada (Assist Engineering Co.),T. Okada (K-VAC),S. Imada (Nihon Advanced Technology)
Kirk1
STF Cavity Group Meeting @2011/2/14
STF Cavity Group Meeting @2011/2/14
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• EP acid (3/2のサンプルを使用 )• Nb ingredient : 8.2g/ℓ• HF ingredient : 29 g/ℓ (全体 38g/ℓの 65%が反応に使われる )• Al ingredient : 15mg/ℓ• Current density : ~ 37mA/cm2 (最近の傾向より )• Cavity surface temperature : <35℃• Control Voltage : 温度と電流密度を見ながら制御• With normal N2 gas flow during extracting EP acid (8ℓ/min)
• 1st water rinsing (1.5hours)• Improved version (25ℓ/minで 20分間上下から流し続ける )• 1 分毎に1秒間水抜きを繰り返す (40分間 )• 最後の 30分は 10min (storing)/3min (flushing)で行う
• Degreasing (1 hour)• FM-20(2%)
• HPR (~ 10 hours)• 5h17m (6 turns, w/o blind flanges)• 4h25m (5 turns, w/ blind flanges)
Condition of EP2 & Rinsing
Brushing @HOM & Flange
using FM-20
Brushing @Flangeusing FM-20
Process log ①
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2/8 10:00 CP @flanges10:30~ Attachment of jigs for EP11:41 Set cavity to EP bed with crane12:00 Installation of cathode bar to cavity
Lunch time13:00 Set data logger to cavity (totally 12ch)
Leak check with N2 gas [O.K.]13:30 Meeting for tomorrow’s working procedure13:50~ Vacuum parts rinsing with ultrasonic in C.R.14:40 Guide for Iwate-Ken Giren @STF16:30 HPR Trouble occurred!
Not finished at top position by automatic operation17:00 fin.
STF Cavity Group Meeting @2011/2/14
2/9 9:45 Cavity rotation starts / EP acid flow starts 9:56 EP2 starts11:05 EP2 stops [1h09m00s] / Idling rotation (3 rpm / 20min)11:10 Plastic case detachment11:27 Idling rotation stops11:29 EP acid is removed from cavity with N2 gas flow(0.020MPa)11:42 First rinsing with ultra pure water starts12:02 Flow rate of pure water is changed slightly due to low level13:17 First rinsing with ultra pure water stops [1h30m]13:24 Detachment of restriction jigs / Data logger detached13:40 Un-installation of cathode bar from cavity / washing cathode bar13:50 transferring cavity from EP bed to wagon / Checking inside cavity (No mark)14:20 Detachment of jigs for EP / Detaching every blind flange
/ Checking inside cavity (No mark) [O.K.]14:30 Brushing at every flange using FM-20 / Shower rinsing14:40 Checking inside cavity (No mark) [O.K.]14:42 Attachment of jigs for degreasing14:47 Flowing FM-20 into cavity14:54 Degreasing with ultrasonic starts15:54 Degreasing with ultrasonic stops [1hour]16:00 Removing FM-20 from cavity16:05 Detachment of jigs for degreasing
/ Checking inside cavity (No mark) [O.K.]
Process log ②
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Process log ③
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2/9 16:10 Brushing at every flange using FM-20 / Shower rinsing16:28 Transferring cavity from wagon on turntable for HPR using crane16:38 Checking tolerance between position of nozzle and center of beam pipe16:39 1st HPR for inside cavity starts21:56 1st HPR for inside cavity stops [5h17m] (6 turns)22:05 Attaching only top flanges in C.R.22:26 fin.
2/10 9:00 Attachment of blind flanges at bottom beam pipe for 2nd HPR 9:18 HPR outside cavity with blind flanges starts [15mins] 9:36 2nd HPR for inside cavity with blind flanges starts14:00 2nd HPR for inside cavity with blind flanges stops [4h25m] (5 turns)14:05 Cavity enters into C.R.14:30 Assembly in C.R. (Class 10) starts(type of helicoflex is changed from In to Sn coating)15:35 Assembly in C.R. (Class 10) finishes / Moving out from Class10 to Class100015:44 Vacuum evacuation starts with heat guns16:00 Turbo pump status 100% (Normal operation, but abnormal noise)16:20 Leak check thoroughly @~1.5x10-3Pa [O.K.]16:35 Baking @100℃ starts19:00 Cavity vacuum : 1.58 x 10-4Pa @108℃/105℃/88℃/44 ℃
(Cell#3/Cell#7/Top/Bottom)Max Vacuum Level just after baking start : ~1.5 x 10-3Pa
Process log ④
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2/12 16:45 Cavity vacuum : 1.23 x 10-5Pa @109℃/106℃/98℃/46℃Ribbon heater at bottom beam pipe is broken!
16:50 Baking Off [48hours] / Ion Pump ON17:15 Cavity vacuum : 1.43 x 10-6Pa @86℃/67℃/90℃/44℃
2/14 8:52 Cavity vacuum : 1.01 x 10-7Pa / I.P head : 3.8 x 10-8Pa 9:25 MHI#14 goes out of clean room and moves to V.T.A.
Status of working ①
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電極棒の先端 ( ビニルテープで保護されている )
Status of working ②
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EP後にブラシングをかける
Status of working ③
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前回の EP2時に9セルに見られた白い縞模様は無くなっていた
STF Cavity Group Meeting @2011/2/14
Status of 2nd EP2 for MHI#14 ①
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current
voltageTcavity
Treservoir
Troom
Tcavity
average current density平均電流密度が 37mA/cm2程度になるように電圧を調整する。(low current density EP)
11STF Cavity Group Meeting
@2011/2/14
Status of 2nd EP2 for MHI#14 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
target
最近の定常状態の比較
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Cavity Mean temp. [℃]
R.M.S. temp. [℃]
Mean i [mA/cm2]
R.M.S. i [mA/cm2]
MHI-A 1st 26.1 0.8 36.5 1.5
MHI#12 1st 25.6 0.9 34.5 1.4
MHI#13 1st 26.9 0.9 37.4 1.5
MHI#12 2nd 26.2 0.5 36.3 1.4
MHI#13 2nd 26.6 0.7 37.6 1.6
MHI#14 1st 26.9 0.5 37.3 1.6
MHI#15 1st 27.9 0.9 36.2 1.5
MHI#14 2nd 29.0 0.8 38.0 1.2
今回は空洞内液温も電流密度もいずれも高かった。ただし、電流の振れ幅はいつもよりは小さかった。
Status of 2nd EP2 for MHI#14 ③
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#1 #2 #3 #4 #5 #6 #7 #8 #9 #10
EP2の間の空洞表面温度の状況。
#11
#12
Status of 2nd EP2 for MHI#14 ④
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#1 #2 #3 #4 #5 #6 #7 #8 #9 #10
EP2の間の空洞表面温度の状況(前ページの最後の拡大図)。
#11
#12
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#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11
#12
Status of UWR for MHI#14 ①
通信不良でデータが途中で何度か跳んでいる。
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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
Status of UWR for MHI#14 ②
Status of UWR for MHI#14 ③
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①は最初の注水完了時。②は流量を増やした状態での洗浄中。③は流量を減らした状態での洗浄中。
①
②
③
STF Cavity Group Meeting @2011/2/14
Status of HPR for MHI#14
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ノズルは 1st HPRでは6往復、 2nd HPRでも5往復させた。
2回目の方が TOCは下がったが、 particleが逆に上がっている。