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Minutes

Created by Main.MirkoPojer on 2007-05-22 - 22:46

The Powering to Nominal procedure was started fro the following circuits:

Several problems were faced:

cryogenics instabilities which delayed the CRYO START signal:
- oscillating level on DFBMC
- high temperature on the first 6 kA in DFBMA (54 K)
delay for PNO.2 step for RCBYH4.L8B2, whose origin was:
- hardware limitation of the PC, which blocked the cycle to 52 A; the PC went on fault and the current drop to zero (intervention of PO to remove the limitation)
- probably due to the problem just mentioned, a very long PM file was produced which was preventing the cycle from being restarted (manual reset of the PC was needed)
RCBYHS4.L8B2 showed a possible NON-CONFORMITY: while preparing this circuit for PNO.1, a high voltage value was detected on a lead (250 mV); a verification of PO showed that this is probably due to an open voltage tap. The circuit has been removed from the SOC.

PROPOSAL FOR WEDNESDAY 23/05:

continuation of tests on RCBCH5.L8B1, RCBCv5.L8B1, RCBYH4.L8B2 and RCBYHS4.L8B1;
Powering to Nominal procedure for circuits RCBYV4.L8B1, RCBYVS4.L8B1 and RCBYVS4.L8B2;
continuation of tests on Q4 and Q5 if released by MPP;
continuation of tests on D2.

POSSIBLE SCENARIOS FOR NEXT WEEK (N.B.: PC, PIC, QPS, EE systems and experts have to be ready for next Tuesday!!!)

RB.A78, RQF.A78 (?), RQD.A78 (?)	Powered by their own converter	DFBA, QPS, EE, PC, PIC Preparation (this week)
	ARC @ 1.9K	ElQA @ 1.9K RB & RQD
		QPS Heater Discharge
		PIC1 RB & RQF
		Connection DC cable - lead
		PC_CONFIG RQ - 350A
		PIC 2 RQ - 350A
		PC_CONFIG RB - 350A
		PIC 2 RB - 350A
		P2N RQ - Max 760A
		P2N RB - Max 760A

	Powered by a 120A converter	DFBA, QPS, EE, PC, PIC Preparation (this week)
	ARC @ 4.5K	PIC1 RB & RQD - Without Quench Heaters
		Connection DC cable - lead
		PC_CONFIG RQ - 100A
		PC_CONFIG RB - 100A

600A Circuits - Priority 1, 25 Circuits	ARC @ 4.5K or 1.9K	DFBA, QPS, EE, PC, PIC Preparation (this week)
		ElQA @ 4.5K-1.9K first Circuits
		QPS Last Conditioning
		PC_CONFIG first circuits
	ARC @ Superfluid Helium	DFBA, QPS, EE, PC, PIC Preparation (this week)
		ElQA @ 4.5K-1.9K All Circuits
		QPS Last Conditioning
		PIC2 First Circuits
		PCS First Circuits
		PC_Config, PIC2, PCS rest of circuits - Parallel

Comments:

Created by Main.MariaPazCasasLino on 2007-05-22 - 17:47

Comments:

List of activities agreed at the Warm Magnets Commissioning Point 8 meeting on 23rd May (8:30 in 936/R-035)

	WM8	LHCb
23.05 MORNING	Verification signalization in the tunnel. Consignation all TI8 LHC PC. Disconnection of the DC cables to the TI8 LHC PC. WELQA on the MSI magnets






23.05 AFTERNOON	WELQA on the rest of the TI8 LHC magnets. Connection of the DC cables to the TI8 LHC PC. Déconsignation all TI8 PC.
24.05 MORNING	Verification signalization in the tunnel. Repeat the WELQA in the circuits where it could not be completed. Connection of the DC cables to the TI8 LHC PC. Déconsignation all TI8 PC. Polarity check TI8 LHC magnets. From 13:00 to 14 :30 Déconsignation PC compensators L8: 1. RPTN.SR8.RBXWSH.L8 1. RPTN.SR8.RBXWH.L8 Switch on RPTN.SR8.RBXWSH.L8 and verification at the magnet level. Switch off RPTN.SR8.RBXWSH.L8 Switch on RPTN.SR8.RBXWH.L8 and verification at the magnet level. Switch off RPTN.SR8.RBXWH.L8	From 13:00 to 14:30 No work around the ANY compensator magnets
24.05 AFTERNOON	Start 24h Heat Run (TI8 LHC + COMPENSATORS L8) (I ultimate)	No work around the compensator magnets L8
25.05 MORNING	24h Heat Run ongoing Temperatures measurements at the end 24h Heat Run	No work around the compensator magnets L8
25.05 AFTERNOON	Turn on all TI8 magnets PC, RPTN.SR8.RBXWSH.L8 and RPTN.SR8.RBXWH.L8. Start 1st Interferences Evaluation Start solution on non conformity on power converter of MQIF87800 (3e-4 ripple)	No work around the compensator magnets L8