| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Rejean Boivin |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| rt J-Port Conditioning MP215 |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:26:600PM |
| Author: To Be Determined |
| This run will be in support of J-Port Conditioning MP215 Engineering setup: ECDC in D2 at 2.e-4 Torr overnight prior to run. XMTR 2,3 and 4 in run-on by 8:00 AM XMTR 1 main power on ONLY 15 minutes of additional ECDC before the first shot May start with some EFC tests in the morning Power systems as on 1010621018 Gas setup: fill B-top with 6 psi of D2 Hybrid enabled (PG4) fill B-side lower with 1 psi of Ar Hybrid enabled (PG1) fill B-side upper with 30 psi of D2 Hybrid DISABLED (PG2) fill C-side with 30 psi of D2 Hybrid enabled (PG3) fill J-bottom with 30 psi of He Hybrid DISABLED (PG5) Enable the following gate valves: ECE, DNB, VUV Run starts at 09:00 and ends at 17:00. Objectives: 1. Investigate J-port power handling. 2. Investigate antenna operation compatibility. 3. Begin characterizing the J-port antenna. a. density scan b. current scan 001 no EF4 002 BT = 5.3T, Ip~ 1 MA, nl_04 1~x10^20 m^-2 Request: D: 1.0 MW [1.05,1.5] sec E: 1.0 MW [1.29,1.5] sec J: 2.0 MW [0.55,1.0] sec Result: Plasma D: Ran with only one trip E: Ran fine J: Ran with 4-5 trips there is significant increased D-alpha with J-port which was not observed yesterday - is this an effect resulting from overnight ECDC Action: Notch up J-port power to 3.0 MW (next shot) 003 BT = 5.3T, Ip~ 1 MA, nl_04 ~1x10^20 m^-2 Request: D: 1.0 MW [1.05,1.5] sec E: 1.0 MW [1.29,1.5] sec J: 3.0 MW [0.55,1.0] sec Result: Plasma with disruption at 1.41 sec D: Ran ran great E: Ran but had trouble turning on J: Ran with multiple trips - first trip occurs at initial H-mode transition Note: Examine DV2 voltage on D-port Action: Retune J, E, and D Remove notch in J-port power (longer flat-top) 004 shot cycle 005 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 Request: D: 1.0 MW [1.05,1.5] sec E: 1.0 MW [1.29,1.5] sec J: 3.0 MW [0.55,1.0] sec Result: Plasma D: Ran with several trips E: Ran fine J: Ran with multiple trips but got to 3.0 MW for 30 msec at 0.735 sec Action: 006 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 Request: D: 1.25 MW [1.05,1.5] sec E: 1.25 MW [1.29,1.5] sec J: 3.0 MW [0.55,1.0] sec Result: Plasma D: Ran with several trips E: Ran fine J: Multiple trips Action: Go to inner-limited plasma (avoid H-mode) 007 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 inner gap was ~0.5 cm Request: D: 1.25 MW [1.05,1.5] sec E: 1.25 MW [1.29,1.5] sec J: 3.0 MW [0.55,1.0] sec Result: Plasma D: Ran with several trips E: Ran fine J: Multiple trips Action: again inner-limited plasma (avoid H-mode) 009 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 Inner limited plasma Request: D: 1.25 MW [1.05,1.5] sec E: 1.25 MW [1.29,1.5] sec J: 3.0 MW [0.55,1.0] sec Result: Plasma in L-mode; D: Clean up to 1.3 MW, then trips; E: Trips above 1.2 MW; OK on top of D port from 0.81 to 0.87 sec, then trips; J: Trips above 1.5 MW this time Action: Repeat shot and leave RF as is; 010 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 Inner limited plasma Request: D: 1.25 MW [1.05,1.5] sec E: 1.25 MW [1.29,1.5] sec J: 3.0 MW [0.55,1.0] sec Result: Plasma in L-mode; D: OK up to 1.3 MW; E: OK up to 1.1 MW on top of D port ; J: Deteriorating and drops out above 1.2 MW with multiple arcs; activity on the J-port screen Action: Lower power request to 2.0 MW on J-port and further slow ramp rate 011 dud 012 dud 013 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 Inner limited plasma Request: D: 1.25 MW [1.05,1.5] sec E: 1.25 MW [1.29,1.5] sec J: 2.0 MW [0.55,1.0] sec Result: L -mode plasma, disrupted at 1.0 sec D: 1.25 MW, only two trips E: 1.25 MW, good, no trips, on top of D port power; J: No target plasma during J-port injection no edge interaction on the septum! Action: ECDC on open 014 dud 015 dud 016 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 Request: D: 1.15 MW [0.65,1.0] sec E: 1.25 MW [0.80,1.0] sec J: 2.0 MW [1.05,1.5] sec Result: Plasma with a few H-mode periods D: 1.25 MW Ok E: 1.25 MW Ok, H-mode with D+E up to 2.5 MW J: OK up to 1.6 MW, then a two trips on the way to 2.0 MW ; brief H-Mode periods Action: Retune 017 BT = 5.3T, Ip~ 1 MA, nl_04 1~1x10^20 m^-2 Request: D: 1.15 MW [0.65,1.0] sec E: 1.25 MW [0.80,1.0] sec J: 2.0 MW [1.05,1.5] sec Result: Plasma with two H-modes D: 1.25 MW Ok E: 1.25 MW Ok, H-mode with D+E up to 2.5 MW J: OK up to 1.6 MW, then tripped on the way to 2.0 MW ; with a brief H-Mode period Action: Lower current to 0.8 MA - 018 Fizzle 019 BT = 5.3T, Ip~ 0.8 MA, nl_04 1~1x10^20 m^-2 Request: D: 1.15 MW [0.64,1.0] sec E: 1.25 MW [0.64,1.0] sec J: 2.0 MW [1.05,1.5] sec Result: Plasma with two EDA H-modes D: Ran with trips at start and end of rf pulse E: Ran fine J: Ran up to 1.5 MW and then had multiple trips. Action: Go to 1.2 MA next shot 020 BT = 5.3T, Ip~ 1.2 MA, nl_04 1~1x10^20 m^-2 Request: D: 1.15 MW [0.64,1.0] sec E: 1.25 MW [0.64,1.0] sec J: 2.0 MW [1.05,1.5] sec Result: Plasma D: Ran with trips E: Ran with trips J: Better ! Ran with one trip and then continued on to 2.0 MW Action: - 021 BT = 5.3T, Ip~ 1.2 MA, nl_04 1~1x10^20 m^-2 Request: D: 1.0 MW [0.64,0.78] sec E: 1.0 MW [0.64,0.78] sec J: 2.2 MW [1.05,1.5] sec & 3.2 MW from [0.86,0.91] sec Result: Plasma - got two H-modes and a disruption D: Ran with one trip E: Ran fine J: Ran fine through short (50 msec) pulse Multiple trips on longer pulse Note: Xmtr4 - screen current overload Action: Reduce current to 1.0 MA and J-port short pulse power to 3.0 MW 022 BT = 5.3T, Ip~ 1.0 MA, nl_04 1~.9x10^20 m^-2 Request: D: 1.0 MW [0.64,0.78] sec E: 1.0 MW [0.64,0.78] sec J: 2.2 MW [1.05,1.5] sec & 3.0 MW from [0.86,0.91] sec Result: Plasma - got four H-modes D: Ran fine E: Ran with one trip J: Ran fine through 50 msec pulse Ran with only one trip on second longer pulse Note: Action: End of run Run Summary: The J-port antenna was tested to 3.0 MW into plasma (1010627022). It heated well and reached ~26 kV briefly. The antenna had numerous faults when the voltage reached ~20 kV and degraded over a series of discharges. The fast data suggests that some arcs are surviving for 30-50 usec. We suspect arcing in the antenna strap is responsible for these arcs because no signal corresponding to the arcs in the optical monitor signals is observed and the antenna paper clip geometry could allow an arc on one antenna strap half without resulting in a phase balance or reflected power fault in the transmission line. We often observe an interaction at the antenna midplane near the septum and side limiters at about the location of the short. This interaction was worse when running inner wall limited (an attempt to stay in L-mode) and is weakly dependent on plasma current (019,016,021). To finish the antenna characterization, we need to a gap, phase, and BT scan. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:13:520PM |
| Author: To Be Determined |
| This run will be in support of RF conditioning of J-Port Antenna, MP215 - ENGINEERING SETUP: ECDC in D2 overnight at 2.e-4 Torr We may require ECDC between shots Power systems as on 1010626012 RF: XMTR 1 thru 4 in run-on by 8:00 AM Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 30 psi D2 Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) fill J-Bottom with 30 psi He Hybrid DISABLED(PG5) Enable the following gate valves: ECE, DNB, VUV Run starts at 9:00 and ends at 17:00 RUN SUMMARY The run was devoted to bringing up RF power in the J-Port antenna. Discharges began by reproducing shot 1010626012. The first shot was a dud due to the failure of EF4 to turn on. The problem was resolved by cycling the EF4 control system, and shot 2 went off as planned. Shot 3 was a repeat of shot 2, although it disrupted at 1.4 s. Shot 4 was a no power shot caused by a false I^2t fault indication. Shot 5 went off as programmed as did shot 6, again reproducing shot 1010626012. The Physics Leader then requested an inner wall limited shot and shot 1010621021 was loaded. This turned out to be still diverted since the PO moved the gap 5mm in the wrong direction in an attempt to make the discharge more strongly inner-wall limited.This was corrected in shot 8, and shots 8-10 were indeed strongly inner-wall limited. Shots 11 and 12 were duds. In shot 11 the NBI valve had been opened, so this was suspected to cause the dud. However, shot 12 was also a dud and the valve was not opened; therefore, field errors were the more likely culprit. EF4 current was decreased from -1280 to -1290 Amps, and shots 13 and 14 went off as programmed. These and all subsequent shots were diverted. After shot 12, ECDC was applied between shots for the rest of the run. In shot 14, the density was reduced from 1e-20 to 0.9e-20. Shot 15 had a very late breakdown and fizzled. The BR offset was suspected to be too high (-.1 mT) and it was decreased by 0.5 mT. Shot 16 then started up well and ran as programmed, as did shot 17 although it terminated in a severe disruption at 1.38 s. Next, the plasma current was reduced from 1 MA to 0.8 MA, but shot 18 fizzled. This was likely due to impurities generated by the disruption in shot 17. Shot 19 was a repeat of the shot set up for shot 18, and it ran as programmed. The current was raised to 1.2 MA for the next 2 shots, 20 and 21, and they ran as programmed but both terminated in severe disruptions. The current was then lowered to 1.0 MA and shot 22, the last shot of the day, started up well and ran as programmed. Overall, a fair day for the machine -- 16 shots starting up and running as programmed, 2 duds, 2 fizzles and 2 no-shots due to engineering problems (1 power supply, one computer). There were several disruptions, presumably caused by RF conditioning or perhaps due to the RF heating. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Jun 27 2001 09:31:31:983AM | 1010627001 | Ron Parker | Shot 1 will begin with the settings from 1010626012. The shot was a dud. EF4 did not turn on. No apparent problem was found, so we'll try again. |
| Jun 27 2001 09:41:00:060AM | 1010627002 | Ron Parker | Shot 2 ran well, no changes were made to power supplies except to cycle through the EF4 control. Next shot:repeat. |
| Jun 27 2001 10:02:23:717AM | 1010627003 | Ron Parker | Shot 3 started up as programmed, but disrupted at 1.4 s. The startup was a bit sluggish and the fill pressure will be reduced (2 ms on pulse gas pulse width) for next shot. Other than that, no changes for next shot. |
| Jun 27 2001 10:11:43:200AM | 1010627004 | Ron Parker | Shot 4 was a no power shot caused by a false I^2 t fault indication. Try again on shot 5. |
| Jun 27 2001 10:31:35:293AM | 1010627005 | Ron Parker | Shot 5 ran well with a slightly improved startup. Shot 6 will be another repeat with no changes. |
| Jun 27 2001 10:58:44:587AM | 1010627006 | Ron Parker | Shot 6 repeated as programmed. The next shot will be inner wall limited, similar to 1010621021. |
| Jun 27 2001 11:23:19:140AM | 1010627007 | Ron Parker | Shot 7 had smaller inner gap, but was not limited. Next shot should be inner wall limited (Inner gap =-2cm) |
| Jun 27 2001 11:35:53:157AM | 1010627008 | Ron Parker | Shot 8 was indeed inner wall limited. Next shot will be a repeat. |
| Jun 27 2001 12:25:54:390PM | 1010627009 | Ron Parker | Shot 9 ran well, still inner wall limited. Shot 10: Another repeat. Cell entry after shot 9 caused a delay of ~15 minutes. |
| Jun 27 2001 12:40:56:633PM | 1010627010 | Ron Parker | Shot 10 was a repeat of shot 9 and ran as programmed. Strong disruptions are occurring during the rampdown. |
| Jun 27 2001 01:22:10:743PM | 1010627011 | Ron Parker | Shot 11 was a dud, due to opening of neutral beam gate valve? |
| Jun 27 2001 01:22:25:103PM | 1010627012 | Ron Parker | Shot 12 was also a dud, even though neutral beam valve didn't open. |
| Jun 27 2001 01:46:18:483PM | 1010627013 | Ron Parker | Shot 13 went off as programmed after 2 duds. The reason for the duds was not clear, but the EF4 current was decreased from -1280 to -1290 A. ECDC is nw being applied between shots. |
| Jun 27 2001 02:34:38:543PM | 1010627014 | Ron Parker | Shot 14 ran well, density was reduced to ~ 9x10^19 m-3. |
| Jun 27 2001 06:36:25:053PM | 1010627015 | Ron Parker | Shot 15 was a fizzle, but had a very late breakdown. It may have been due to gas injected from opening the Thomson valve, or maybe the BR was too high (-.1 mT). In next shot, we'll drop BR by .5 mT. Still running ECDC between shots. |
| Jun 27 2001 03:20:34:233PM | 1010627016 | Ron Parker | Shot 16 started up well and ran as programmed. |
| Jun 27 2001 03:20:55:813PM | 1010627017 | Ron Parker | Shot 17 ran well, as programmed. Terminated by severe disruption at 1.38 ms. Next shot: plasma current reduced to 800 kA. |
| Jun 27 2001 03:42:09:597PM | 1010627018 | Ron Parker | Shot 18 was a fizzle -- impurity level too high after last disruption? Try again. |
| Jun 27 2001 04:04:50:693PM | 1010627019 | Ron Parker | Shot 19 ran well, following the programming. Next shot: 1.2 MA. |
| Jun 27 2001 06:35:06:610PM | 1010627020 | Ron Parker | Shot 20 ran as programmed at 1.2 MA, although it disrupted early in the ramp-down. Next shot: repeat |
| Jun 27 2001 06:35:43:707PM | 1010627021 | Ron Parker | Shot 21 ran again as programmed, I=1.2 MA, again disrupting on ramp-down |
| Jun 27 2001 05:09:54:497PM | 1010627022 | Ron Parker | Shot 22 ran as programmed (I=1 MA), although it disrupted on the rampdown @ 0.5 MA. This was the last shot of the day. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:03:840AM | Plasma | Ok | |
| 2 | 09:26:55:570AM | Plasma | Ok | |
| 3 | 09:46:47:850AM | Plasma | Ok | |
| 4 | 10:05:16:050AM | Plasma | Bad | No Power Shot |
| 5 | 10:18:07:320AM | Plasma | Ok | |
| 6 | 10:38:09:257AM | Plasma | Ok | |
| 7 | 10:58:47:257AM | Plasma | Ok | |
| 8 | 11:21:59:700AM | Plasma | Ok | |
| 9 | 11:42:34:903AM | Plasma | Ok | |
| 10 | 12:23:59:810PM | Plasma | Ok | |
| 11 | 12:46:08:013PM | Plasma | Ok | |
| 12 | 01:00:59:773PM | Plasma | Ok | |
| 13 | 01:21:41:680PM | Plasma | Ok | |
| 14 | 01:49:04:503PM | Plasma | Ok | |
| 15 | 02:20:23:380PM | Plasma | Ok | |
| 16 | 02:44:34:803PM | Plasma | Ok | |
| 17 | 03:07:08:667PM | Plasma | Ok | |
| 18 | 03:30:49:250PM | Plasma | Ok | |
| 19 | 03:53:27:927PM | Plasma | Ok | |
| 20 | 04:15:35:147PM | Plasma | Ok | |
| 21 | 04:38:30:463PM | Plasma | Ok | |
| 22 | 05:00:57:983PM | Plasma | Ok | |