mhi#14 号機の２回目の ep2

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


2

• 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


3

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.


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

4

Process log ③


5

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


6

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


7

電極棒の先端 ( ビニルテープで保護されている )

Status of working ②


8

EP後にブラシングをかける

Status of working ③


9

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


Status of 2nd EP2 for MHI#14 ①

10

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


12

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


13

#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


14

#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


15

#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。


16

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


17

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


Status of HPR for MHI#14

18

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。

mhi#14 号機の２回目の ep2

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