[dsg-hdice] Sorry, another Emergency Help is needed

[Xiangdong Wei]

Hi Tyler,

Thank you for working on our problem. I really appreciate it.

We ran several tests in different conditions and they all failed the same way this morning. Finally we powered down the entire rack2, except the IPS, and rebooted every component. It works again!!!

The nmr signals which confirmed the highly polarized HDice target was transferred into IBC. We are doing more nmr studies for the next 2 days.

I still don’t have any clue why the rack needs a power cycle.

The output of FRS only send out -63 dBm RF power when scanning, despite our various power requests. Since the fsNMR works now, we’ll just leave it alone until the UITF run stops.

Thanks,
________________________________
From: Tyler Lemon <tlemon at jlab.org>
Sent: Thursday, November 19, 2020 8:29 AM
To: Xiangdong Wei <xwei at jlab.org>; Brian Eng <beng at jlab.org>; dsg-hdice at jlab.org <dsg-hdice at jlab.org>
Subject: Re: Sorry, another Emergency Help is needed

Hi Xiangdong,

I took a look this morning and re-added the regular FRS program back to the LabVIEW project.

Tyler
________________________________
From: Xiangdong Wei <xwei at jlab.org>
Sent: Thursday, November 19, 2020 2:12 AM
To: Brian Eng <beng at jlab.org>; Tyler Lemon <tlemon at jlab.org>; dsg-hdice at jlab.org <dsg-hdice at jlab.org>
Subject: Re: Sorry, another Emergency Help is needed

Hi Brian,

Thank you for checking the vi, I will try again early tomorrow morning.

Yes, I left the dual IPS vi on the screen, but not running (to avoid vi interface, if any). Sometimes different VIs don’t like each other—-just like the FRS and NMR scan.

Talking about FRS, could you please add it back to the project so I can get the resonance information, in case we have difficulty to solve the fsNMR power issue tomorrow morning? I need to find a work around to move to the next step (while waiting for fixing the problem).

Thanks,

Xiangdong

________________________________
From: Brian Eng <beng at jlab.org>
Sent: Thursday, November 19, 2020 12:46 AM
To: Xiangdong Wei <xwei at jlab.org>; Tyler Lemon <tlemon at jlab.org>; dsg-hdice at jlab.org <dsg-hdice at jlab.org>
Subject: Re: Sorry, another Emergency Help is needed

I logged in to hdicenm2 with the hdice account to take a quick look at the power settings in the fsNMR.vi code to make sure it wasn't anything obvious causing those symptoms.

I couldn't see/find anything and manually running the set/read VIs (the only 2 I ran [it started at -50, I changed it to -60, then back to -50]) for the attenuator A works fine.

Also the dual power supply vi was on the screen when I logged in but not running; is that to be expected?

I've since logged off, but left all the VIs I opened on the screen.

________________________________
From: Xiangdong Wei <xwei at jlab.org>
Sent: Wednesday, November 18, 2020 11:57 PM
To: Tyler Lemon <tlemon at jlab.org>; Brian Eng <beng at jlab.org>; dsg-hdice at jlab.org <dsg-hdice at jlab.org>
Subject: Sorry, another Emergency Help is needed

Hi Tyler,

We successfully transferred a polarized target from DF to PD and measured target polarization there with NMR rack2, and then transferred it to IBC in UITF.

Since the NMR signal of a fully polarized target is huge, I had to use very low power, such as-40, -50, and -60dBm.

The fsNMR on the control rack did not allow me to run with those power, and sending high power instead. -30 was fine, but -50dBm was changed to -18dBm by the fsNMR VI, and -40dBm was changed to -24dBm. The error pictures are attached here. Please take a look at the fsNMR ASAP. I will be at UITF tomorrow morning to check the vi when you are done.

Since the IBC magnets are controlled by the rack2 pc also, please don’t change the magnet settings. The testing frequency range should be between 1 and 2 MHz; and power is -60, -50, -40, and maybe -30, to avoid accidentally de-polarize the target. The IBC solenoid is at ~0.9Tesla.

Thanks,

Xiangdong


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