MWS continues to provide 22Ne2+ for pilot beam use. Beam quietly sitting on FC6. Stripchart attached. Also, Supernanogan plasma is on at low RF power for conditioning.

Last day of this pilot beam to TUDA-II. Expect a beam switch tomorrow for sake of TIGRESS.

Attached is Stripchart of weekend beam operation. Pretty nice indeed. Top trace (red) is Q3 skimmer, representative of total beam out of the source  Blue trace is 22Ne2+ on FC6 with magnet field stabilization program active. Brown trace is NA-LCW temperature as measured at exit of Supernanogan plasma chamber. Note an inverse trend against ambient temperature. Something to investigate at some point.

EOB for SEBT1 run at 08:30, taking 11Li from ITE and 22Ne2+ from OLIS when needed. Attempted emittance scans last evening, but no data showed, and no more time to investigate. So be it. Another time.

Prepare to switch beam from 22Ne2+ to 20Ne1+. Skimmers from 22Ne2+ run shown below. Table of tune options below. We will be using the Rick Tune.

Device	Present Tune	Scaled	Scaled		Rick Tune	Scaled		Web Tune	Final
	22Ne2+	20Ne2+	20Ne1+		25Mg1+	20Ne1+		20Ne1+	20Ne1+
IOS:BIAS:VOL.VAL	22440	20400	40800		51000	40800		40800	40800
IOS:EE:VOL.VAL	1072	975	1949			3064		3064	1419
IOS:EESS:VOL.VAL	1810	1645	3290			0		0	0
IOS:XCB1:VOL.VAL	225	205	409			0		0	500
IOS:YCB1:VOL.VAL	268	244	487			0		0	140
IOS:CCB1:VOL.VAL	500	455	909			0		0	500
IOS:B1A:POS:VOL.VAL	3301	3001	6001			5693		5693	5933
IOS:B1A:NEG:VOL.VAL	3845	3496	6991			5693		5693	5933
IOS:XCB1AW:VOL.VAL	1658	1507	3014			4362		4362	3660
IOS:XCB1AE:VOL.VAL	2242	2038	4076			4362		4362	3660
IOS:YCB1A:VOL.VAL	412	375	749			0		0	340
IOS:Q1:POS:VOL.VAL	1215	1104	2208		-2425	-1940		0	1113
IOS:Q1:NEG:VOL.VAL	1215	1104	2208		-2425	-1940		0	1113
IOS:Q2:POS:VOL.VAL	148	134	269		-1115	-892		1428	892
IOS:Q2:NEG:VOL.VAL	148	134	269		-1115	-892		1428	892
IOS:Q3:POS:VOL.VAL	786	715	1429		0	0		2570	0
IOS:Q3:NEG:VOL.VAL	786	715	1429		0	0		2570	0
IOS:YCB3:VOL.VAL	397	361	721			0		0	500
IOS:MB:CUR.VAL	148	135	270			280		280	277
IOS:YCB4:VOL.VAL	316	287	575			0		0	470
IOS:CCB4:VOL.VAL	300	273	545			0		0	300
IOS:Q4:POS:VOL.VAL	1384	1258	2516		1333	1067		3392	1067
IOS:Q4:NEG:VOL.VAL	1384	1258	2516		1333	1067		3392	1067
IOS:Q5:POS:VOL.VAL	1254	1140	2280		0	0		2232	0
IOS:Q5:NEG:VOL.VAL	1254	1140	2280		0	0		2232	0
IOS:Q6:POS:VOL.VAL	0	0	0		3225	2580		0	2580
IOS:Q6:NEG:VOL.VAL	0	0	0		3225	2580		0	2580
IOS:YCB6:VOL.VAL	290	264	527			0		0	300

Saved tunes: 100518_1113.snapiosfc6 (strict) & 100518_1128.snapiosfc6 (tweaked). Emittance scan attached.

At noon, beam handed over to Sophia. She has questions about the defeats associated with the Q3 failure last year. Checking... done.

Summary of Q1/2/3 wiring status right now:

• Defeat remains on Q1.
• Q1+/- cables swapped at power supplies.
• Q2 output is normal (+ drives L/R and - drives T/B) and is opposite to Q1 and Q3.
• Q3 output is normal (+ drives T/B and - drives L/R).
• All wiring at DBs is normal.

Sophia is continuing her tuning using IOS tune as provided.

Later... Sophia reports that this beam transports nicely. That said, the IOS tune is a little different now. Compare attached below.

ISAC-I tuning done yesterday. TBC today into ISAC-II. Beam very nice overnight.

Tried to see the background before 33S installation. Found few problems: MCIS:YCB1 does not hold more than 58V.

Very difficult to transport the beam without YCB1. Need to find a solution. Open and fix it is not an option even though we have a ready spare. It will take two weeks to get the vacuum back.

------------------------------

Outgoing TIGRESS experiment was the occasion for another ISAC milestone, 8MeV/u through the SCC for the first time just around midnight last Friday, May 21st. This also represented the first 8MeV/u beam to an experiment. And we can proudly say that OLIS beam was used. TIGRESS run ended at 08:30 as scheduled. Attached is a trar graph of beam on FC6, snapped periodically throughout the run. As before, you can see a small daily variation likely related to temperature of NA-LCW. There were reports of HPL tests this past Thursday and Friday. Evidently no effect over here.

after 24 hours background spectrum saved as "BackgroungNo33S002.dat"

RF Amplitude :1.553 , RFoutput power= 0, Output power (dB)=0  

after 24 hours background spectrum saved as "BackgroungNo33S003.dat"

RF Amplitude :7.767 , RFoutput power= 5W, Output power (dB)=36.4

33S spectrum is saved as 33S_spectrum.dat 

Some 3enA of beam on FC6 presently. Let it sit.

33S on FC6 overnight. Preparing to send beam to DRAGON now, and confirm isotope.

Source gas pressure gauge on canister = -20"Hg. MCIS pressure = 7.8e-8 Torr.

Beam tuning in progress. Source gas canister at -20"Hg. MCIS pressure at 7.62e-8 Torr.

Delivery of 33S6+ to DRAGON continues. A couple of RF tweaks done over the weekend. Source gas canister pressure at -20"Hg. MCIS pressure at 7.3e-8 Torr. At this rate, we could deliver 33S until approximately forever.

33S6+ delivery to DRAGON continues. Looks like there was an RF tweak overnight. Source gas canister still at ~-20"Hg. MCIS vacuum at 7.4e-8 Torr.

33S6+ delivery to DRAGON continues. It is Maintenance Day for everybody else today. Source gas canister pressure = -20"Hg. MCIS pressure = 7.7e-8 Torr.

33S6+ delivery to DRAGON continues until Saturday morning. All the signs are that beam is excellent. Source gas canister is still at ~-20"Hg, and MCIS vacuum is at 7.0e-8 Torr.

Delivery of 33S6+ continues to DRAGON for the final day. Some online tuning of the line overnight. Source gas canister pressure remains at ~-20"Hg, and MCIS pressure is at 7.1e-8 Torr.

Keerthi set up the Supernanogan for 15N operation and destined for TIGRESS, using two source gas options: a miniature bottle of enriched 15N2 and a canister with a charge of research-grade 14N2. The canister is similar to the one we used for the 33S run to DRAGON, which finished Saturday morning. Canister is at -22"Hg and MCIS at 7.27e-8 Torr. A couple of beam stability tests were conducted at 15N4+ and 15N6+. Bob can choose which one he prefers to use. 15N4+ is selected and tuned through IOS up to the RFQ presently (~10:30 am).

Later... Bob reported at the Beam Delivery meeting that the 33S6+ beam was a very nice beam. We appreciate hearing it.

User tuning began Sunday night. Beam physics expert chose to retire the IOS:Q1 defeat, as he did not know until yesterday that it existed. He discovered it after attempting to retune yesterday around noon from scratch and making a mess, notwithstanding Keerthi's clear instruction to leave it alone. He also does not know that Rick developed a tune for this, which provides cleaner transmission than the "book" tune. Pity. Presently there are some 75enA of beam at FC6. That should be enough. Note that there were some 90enA with the "defeat" tune in place, prior to changing the IOS tune. Canister is at ~-22"Hg, and MCIS pressure at ~7.0e-8 Torr at ~09:00.. ICR is tuning through presently.