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Re: [Star-fst-l] FST Latency Adjusted

From: Ziyue Zhang <zzhan70 AT uic.edu>
To: "Visser, Gerard" <gvisser AT indiana.edu>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] FST Latency Adjusted
Date: Mon, 29 May 2023 15:36:30 -0400

Hello Gerard,

Thank you for bringing up your concern. A minor clarification, I should have used the word "accident"...

You are absolutely correct, I forgot the power cycle step; that will be on my top list next time.

In the case of the current situation, this is my naive understanding: since there was already a trip on every channel, and during the 1-2 days, the shift crews have turned on and off the FST multiple times, so they should effectively have gone over power cycle... I checked the Max Time Bin plots yesterday late afternoon, and noticed this issue, but there was no beam, so I checked again this morning and made the adjustment based on the plot in this morning's PHYS runs.

Sincerely,

Ziyue

On Mon, May 29, 2023, 12:11 Visser, Gerard <gvisser AT indiana.edu> wrote:

Dear Ziyue,

Thanks, this sounds good. (I didn't look at plots right now, sorry, but I trust you see the correct effects.)

However I am concerned by the statement " New APVs need adjustment found, which is most likely caused by the "FST not off during beam dump" incident yesterday":

It should be basically impossible to have any lasting effect of this sort from any beam incident. I'd expect if there is a lasting effect, it would be in the nature of total failure or of an increase in noise level.
On the other hand though, the hardware might at any time get into a "upset" condition, where some internal states are incorrect and this might (not unlikely) be caused by beam conditions. It would go back to normal upon a power cycling of everything.
==> If you think something shifted or is acting abnormally, power cycle!
If you readjusted something to make it normal instead, I suggest power cycle and check things, and if necessary make adjustments (maybe contrary to prior adjustments.

Sincerely,

Gerard

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of Ziyue Zhang <zzhan70 AT uic.edu>
Sent: Monday, May 29, 2023 11:40 AM
To: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: [Star-fst-l] FST Latency Adjusted

Dear all,
The FST APV latency has been adjusted. Details can be found here.

Best regards,

Ziyue

[Star-fst-l] FST Latency Adjusted, Ziyue Zhang, 05/29/2023
- Re: [Star-fst-l] FST Latency Adjusted, Visser, Gerard, 05/29/2023
  - Re: [Star-fst-l] FST Latency Adjusted, Ziyue Zhang, 05/29/2023
    - Re: [Star-fst-l] FST Latency Adjusted, Visser, Gerard, 05/29/2023
      - Re: [Star-fst-l] FST Latency Adjusted, videbaek, 05/29/2023
        
        Re: [Star-fst-l] FST Latency Adjusted, Ye, Zhenyu, 05/30/2023
        
        Re: [Star-fst-l] FST Latency Adjusted, Ziyue Zhang, 05/30/2023
        
        Re: [Star-fst-l] FST Latency Adjusted, Visser, Gerard, 05/30/2023
        Re: [Star-fst-l] FST Latency Adjusted, Visser, Gerard, 05/30/2023
        
        Re: [Star-fst-l] FST Latency Adjusted, Ziyue Zhang, 05/30/2023
        Re: [Star-fst-l] FST Latency Adjusted, Visser, Gerard, 05/30/2023
        Re: [Star-fst-l] FST Latency Adjusted, Aschenauer, Elke, 05/30/2023
        Re: [Star-fst-l] FST Latency Adjusted, Ziyue Zhang, 05/30/2023