[Halld-cps] [EXTERNAL] Re: Hall D CPS meeting on Monday

[Igor Strakovsky]

Dear Pavel,

Your suggestion to keep temperature control does not sllow to fix a
problem. Similar, 2nd item

Please propose a reall solution

Thanks, Igor

On Mon, May 1, 2023, 5:19 PM Pavel Degtiarenko <pavel at jlab.org> wrote:

> Hi All,
>
> My today's presentation may be found here:
> https://userweb.jlab.org/~pavel/projects/KLCPS/klcps59/K0LmtgMay01.pptx
> Sorry it was put together quite hastily.
>
> A couple of extra considerations regarding the protection against possible
> beam missteerings.
>
> Slowly creeping beam shifts should be recognized by the redundant
> temperature measurements along the absorber, which must control the
> temperature uniformity along it.
>
> Fast events of magnetic field excursions can be captured by various
> magnetic field sensors. Standard ones can be used. Also, a simple coil
> placed in the magnetic field can be made really stable against radiation
> damage. Changes in the field would generate detectable currents in it. The
> signals, together with the signals from the the downstream ion chambers,
> will need to generate Fast Shutdowns commands for the Accelerator. Beam
> missteerings at the entrance of the CPS need to be also monitored (likely
> by the collimator/ion chamber combination).
>
> All failure scenarios should be simulated and evaluated, naturally.
> Actually, the beam FWHM of 2.5 mm makes the conditions of the beam impact
> on copper much easier than the impact of a 100-200 um size beam. The
> dedicated beam diffuser in front of the standard Hall D dump spreads the
> beam similarly and helps against the copper melting. The "time-to-melt"
> could be long enough for the temperature control system to react in time.
>
> I will produce the heat deposition map in the Absorber for the cases when
> the mag. field is off-nominal.
>
> Best regards,
> Pavel
> ------------------------------
> *From:* Halld-cps <halld-cps-bounces at jlab.org> on behalf of Hovanes
> Egiyan <hovanes at jlab.org>
> *Sent:* Sunday, April 30, 2023 10:58 AM
> *To:* halld-cps at jlab.org <halld-cps at jlab.org>
> *Subject:* [Halld-cps] Hall D CPS meeting on Monday
>
>
>
>
> Hi all,
>
>
>
> We will have a meeting on Monday, May 1st, at 1:30pm JLAB time using Zoom
> to discuss CPS design for Hall D.  The preliminary agenda is posted at :
>
>
>
> https://wiki.jlab.org/klproject/index.php/CPS_meeting_-_May_1,_2023
>
>
>
> Feel free to add more discussion items.
>
>
>
> Zoom Meeting ID: 160 854 7409
>
> Passcode: 454278
>
> URL:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1608547409-3Fpwd-3DbWhpZG1yWVk1TWlEb3BjUW9DdmVLZz09&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=u3fDFw2eQBeUcb0_zqxUBOOSjhFiQ-zn9awd1mf1ncg&m=YxLRATNBUwOFYb4g46GQ7jQT8e2IaIpJI9K4aWL3HspvTLhuu_T9rJS8DTEpxkBa&s=CKX2gBy-sCtzlbK69SGGhy8fZWaGV86kzONTNWtAwFU&e= 
>
>
>
> Best,
>
>    Hovanes.
>
>
>
>
>
>
>
>
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