[Alert_collaboration] [EXTERNAL] News & ALERT Meeting

Thu Oct 17 08:47:41 EDT 2024

Hello Bob,

Thank you for providing the new procedures. They look very good. A 
couple a comments on the target installation and replacement procedure:

- Target initial installation should have a last step to remove the 
tooling support plate installed in step 2.

- For the target replacement, I think we should add a mention to the 
failed target procedure in the other document in the case of a failed 
target.

Following up on the pressure discussion, another couple of remarks.

- I think the repeatability test can indeed be done at a lower pressure 
(15psi is fine with me). The measurement that will be most important is 
the final one with cabling in place, which should be at 68psi.

- It would be useful to add a measurement without pressure as well at 
the end. This is because we will setup the beam position without the 
target pressurized in the beginning of the experiment. So if the target 
moves by more than 100µm sideways when pressurized that will be 
important to know for our commissioning.

Thanks

Raphael

Le 17/10/2024 à 13:32, Bob Miller a écrit :
> Hi Whit,
>
> See answers below in bold:
>
>
> Bob Miller
> Hall B Lead Engineer
> (757) 822-9586
>
> ------------------------------------------------------------------------
> *From:* Armstrong, Whitney R. <warmstrong at anl.gov>
> *Sent:* Wednesday, October 16, 2024 5:15 PM
> *To:* alert collaboration <alert_collaboration at jlab.org>; Raphael 
> Dupre <raphael.dupre at ijclab.in2p3.fr>; Bob Miller <rmiller at jlab.org>
> *Subject:* Re: [Alert_collaboration] [EXTERNAL] News & ALERT Meeting
> Hi Bob,
>
> Thanks for the update.
> I have a few comments and questions regarding the Survey and Alignment 
> Procedure:
>
> - Is the "Target Location Repeatability" test performed after the full 
> "Target Initial Installation" with leak check procedure? Previously we 
> had done some survey steps before the leak check.
> *Yes, this is done after the leak checks are complete.*
> *
> *- For the "Leak Test after Installation into ALERT Detector", could 
> we add on a measurement of the depressurization after a few hours? 
> This might be useful to know later.
> *Yes, we can increase the leak down test to 3 hours after step 12.*
>
> - Is it possible to add to the Target Location Repeatability Test an 
> initial measurement of the downstream window OD without the Target 
> Support Block Halves in place yet?
> *No, the target droops too much without the support halves.*
>
> With and without pressure? I am curious how much movent occurs due to 
> the Target Support Block Halves.
>
> - I am concerned about the  Target Location Repeatability tests being 
> done without something protecting the HDC. Is there a difference 
> between 15 psi and 68 psi in terms of straw deformation? Maybe adding 
> a few more pressures between 0 and 68 psi to my previous suggestion 
> would help answer that. That is, if the straw is as rigid at 15 psi as 
> it is at 68, perhaps the repeatability tests only need to go 15 psi? 
> (Note 15 psi is just a randomly chosen low pressure).
> *The request to survey under pressure came from the ALERT group.  I 
> will change the pressure to whatever is suggested by the ALERT group.*
> *
> *
> *Regards,*
> *Bob
> *
> Thanks,
> Whit
>
> ________________________________________
> From: Alert_collaboration <alert_collaboration-bounces at jlab.org> on 
> behalf of Bob Miller via Alert_collaboration 
> <alert_collaboration at jlab.org>
> Sent: Wednesday, October 16, 2024 7:22 AM
> To: alert collaboration; Raphael Dupre
> Subject: Re: [Alert_collaboration] [EXTERNAL] News & ALERT Meeting
>
> Hi Raphael, Please find the attached procedures for your review. 
> Thanks, Bob Miller Hall B Lead Engineer (757) 822-9586 From: 
> Alert_collaboration <alert_collaboration-bounces@ jlab. org> on behalf 
> of Raphael Dupre via Alert_collaboration
> ZjQcmQRYFpfptBannerStart
> This Message Is From an External Sender
> This message came from outside your organization.
>
> ZjQcmQRYFpfptBannerEnd
> Hi Raphael,
>
> Please find the attached procedures for your review.
>
> Thanks,
>
>
> Bob Miller
> Hall B Lead Engineer
> (757) 822-9586
> ________________________________
> From: Alert_collaboration <alert_collaboration-bounces at jlab.org> on 
> behalf of Raphael Dupre via Alert_collaboration 
> <alert_collaboration at jlab.org>
> Sent: Wednesday, October 16, 2024 7:19 AM
> To: alert collaboration <alert_collaboration at jlab.org>
> Subject: [Alert_collaboration] [EXTERNAL] News & ALERT Meeting
>
> Hello everyone,
>
> I wanted to let you know that the team in JLab has repaired the broken
> wire and cleaned up the chamber. All HV sectors were tested and all of
> them reached 1800V with very low current. They will be reinstalling
> everything in the coming days.
>
> To discuss this and more, we will meet tomorrow at the usual time 9 am
> (ANL) / 10 am (JLab) / 4 pm (IJCLab).
>
> Connection link:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__ijclab.zoom.us_j_98179063617-3Fpwd-3DNjVTaisxY1d6eTVjM25LNFlMUW9QZz09&d=DwIDaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=xvIrZb1p8HoRayKD1Sz8zPzqi4-qHfiBCWqgj3oMbOQ&m=jqIOZ45OEhkRx1o3nS63AbGKh3NIgymKvMZBGjrimLmrbAXLCwATDS9PEeoYjZxI&s=OMObZtn50ENrelZw5FxUXIe8LeCqt0-F720qiTq8MVE&e= 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__ijclab.zoom.us_j_98179063617-3Fpwd-3DNjVTaisxY1d6eTVjM25LNFlMUW9QZz09&d=DwIDaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=xvIrZb1p8HoRayKD1Sz8zPzqi4-qHfiBCWqgj3oMbOQ&m=jqIOZ45OEhkRx1o3nS63AbGKh3NIgymKvMZBGjrimLmrbAXLCwATDS9PEeoYjZxI&s=OMObZtn50ENrelZw5FxUXIe8LeCqt0-F720qiTq8MVE&e=>
>
> Wiki page:
> https://clasweb.jlab.org/wiki/index.php/ALERT_Meeting_2024<https://urldefense.proofpoint.com/v2/url?u=https-3A__urldefense.us_v3_-5F-5Fhttps-3A__clasweb.jlab.org_wiki_index.php_ALERT-5FMeeting-5F2024-5F-5F-3B-21-21G-5FuCfscf7eWS-21ZqDsRb5MbRXIdurnb6ju-2D6pTrtrM0CRW0pIrJfVHNH3llHfQqMUzMyCAo1VBgWCXAxq6iayyrCml-2DjWGPmZQ7k7xh0aC-24&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=plE8x1Qj6-oBUv4DJULncvm2rlHV-MV7JFc6UEKBC1w&m=FXyBF1kqucQczs0aLe6nYgSFCEJaLFxfcoqzlmJde19-vOP8YkKUvIn51WklNISX&s=RZFBMFkc971pimPQHCa7W5olqcBfIxH96UKSpqNKfNg&e= 
> <https://clasweb.jlab.org/wiki/index.php/ALERT_Meeting_2024<https://urldefense.proofpoint.com/v2/url?u=https-3A__urldefense.us_v3_-5F-5Fhttps-3A__clasweb.jlab.org_wiki_index.php_ALERT-5FMeeting-5F2024-5F-5F-3B-21-21G-5FuCfscf7eWS-21ZqDsRb5MbRXIdurnb6ju-2D6pTrtrM0CRW0pIrJfVHNH3llHfQqMUzMyCAo1VBgWCXAxq6iayyrCml-2DjWGPmZQ7k7xh0aC-24&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=plE8x1Qj6-oBUv4DJULncvm2rlHV-MV7JFc6UEKBC1w&m=FXyBF1kqucQczs0aLe6nYgSFCEJaLFxfcoqzlmJde19-vOP8YkKUvIn51WklNISX&s=RZFBMFkc971pimPQHCa7W5olqcBfIxH96UKSpqNKfNg&e=> >
>
> Cheers,
> Raphael
>
> --
> Raphaël Dupré
> Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
> CNRS - IN2P3
> Université Paris-Saclay
>
>
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-- 
Raphaël Dupré
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
CNRS - IN2P3
Université Paris-Saclay
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