[G14_run] Fw: [EXTERNAL] Re: Locations of the Kel-F windows

Tue May 9 09:10:02 EDT 2023

Dear All,

I am done with Figs 33 & 34. One can use them and remove Figs 31 & 32

Cheers, Igor

On Mon, May 8, 2023 at 11:09 AM Tsuneo Kageya <kageya at jlab.org> wrote:

> Privet Igor,
>
>  thank you for the curves
>  They are very useful to let our work forward.
>
>       Paka, Tsuneo Kageya.
> ------------------------------
> *From:* Igor Strakovsky <igor at gwu.edu>
> *Sent:* Monday, May 8, 2023 9:59 AM
> *To:* Tsuneo Kageya <kageya at jlab.org>
> *Cc:* g14_run at jlab.org <g14_run at jlab.org>
> *Subject:* Re: [G14_run] Fw: [EXTERNAL] Re: Locations of the Kel-F windows
>
> Dear All,
>
> As a small update....
> Andrey and Kirill were ill and now they are back. I will update plots when
> I will get BnGa recent results
>
> Cheers, Igor
>
>
> On Mon, May 8, 2023 at 9:54 AM Tsuneo Kageya via G14_run <g14_run at jlab.org>
> wrote:
>
> I just forgot to include g14_run to respond to the email from Alessandra
> the last Friday and am sending it to
> everybody.
>
> Ciao Alessandra,
>
>  thank you for the updates.
>
>  I am still reading your email and note.
>  I think we may have the following conclusions about empty target
> subtractions for your case.
>
> (1)  If we are interested only in the range of your z vertex cut of -9.5 <
> z < -5.8 cm and entrance and exit Kel-F windows' contributions could be
> negligible to this z range, the empty target distributions normalized
> with the downstream Kel-F can be used without complicated
> calculations, I think.
>
> (2)  We can use the factors ρrel= 0.7 (in your note) for Gold target
> (19b) and ρrel= 1.0 for the Silver target (21a) to be multiplied to the
> empty
> distributions for the subtractions.
>
> (3)  Still we may need to shift the z vertex distributions for 21a and 10b
> target cell positions like you are doing in the note.
>
>  Discussions on the eq. 36 - 38 are for the wider cuts like -10 < z < -2
> cm, I think.   Probably you got the ways of calculations from Andy's
>  notes.   I used the 0.903 for the subtractions for Gold target with the
> wider z cut.
>
>  I will try to give you more detailed info. like Al wire's diameter and
> total number of wires later.
>
>       Ciao, Tsuneo Kageya.
> ------------------------------
> *From:* filippi at to.infn.it <filippi at to.infn.it>
> *Sent:* Friday, May 5, 2023 10:22 AM
> *To:* Tsuneo Kageya <kageya at jlab.org>
> *Cc:* alessandra filippi <filippi at to.infn.it>; g14_run at jlab.org <
> g14_run at jlab.org>; Tsuneo Kageya <kageya at jlab.org>
> *Subject:* [EXTERNAL] Re: Locations of the Kel-F windows
>
> Hi Tsuneo,
>
> >
> > Ciao Alessandra,
> >
> >
> >  here is an expanded view of Fig. 28 (attached to this email).
> >
> >  I would like to suggest to show z range -15 < z < -5 cm for Fig. 28.
> >
> >  I don't think we need the range of z > -5 cm.
>
> ok, I just put there what I had ready, I can zoom it a little bit.
>
> >
> >  We can see the following things from the figure.
> >
>
> aaaah, now I understand... the "Aluminum wire" is that sort of messy hank
> inside the cell! I believed the wires were tensioned along the walls of
> the cylinder. So, they make an overall contribution in the central part
> which could potentially be relevant, it makes sense.
> We know the density of this wire, has anybody ever weighted the total
> amount of Al mass in this region? its length and its cross section, to be
> more quantitative?
> I'll correct the text accordingly. Sorry my bad, I never understood this
> was the real target structure.
>
> >
> >  (1) Relative positions of three Kel-F windows for Gold2 (19b) and Empty
> > (21a).
> >
> >  I am attaching the info. about target cell 19b and 21a.
> >
> >
> >  (a) The positions of downstream Kel-F windows for Gold2 and Empty are
> > close at Fig. 28.
> >
> >
> >  (b) As can see L1 on the table of the attacment, the difference of 96.21
> > - 95.74 = 0.47 mm
>
> ok. Do we care about what happens in the very upstream region, L4?
> I assumed not.
>
> >
> > is seen at the exit windows at Fig. 28.
> >
> >
> >  (c) L4 difference shown on the table as 36.90 - 34.10 = 2.8 mm can be
> > seen at the entrande windows at Fig.28.
> >
> >
>
> ok
>
> >  (2) Small diffence of downstream Kel-F positions between Silver (21a)
> and
> > Empty (21a) can be observed as 1 mm or so
> >
> > which could be negligible.
> >
>
> yes, I believe the important information is how long is the "HD" volume,
> that is l = L1-L3-L4
>
> >
> >  In order to understand eq. 35, can you define, l_empty, l_gold, Z
> > ^gold_KelF1 and Z^empty_KelF1 ?
> >
> > What are their equivalent numbers at the table ?
>
> l_{cell} = L1-L3-L3 - they differ for about 1 mm (61.63-59.20 mm), you can
> see them in the table. This means that the HD length is slightly different
> in the two cases.
> Z^whatever_KelF1 is the z I get from a gaussian fit of the entrance window
> peak for each cell. I need this and the HD length (see above) to write the
> transformation for the z coordinate, to "align" the targets, ie bring the
> gold2 entrance window to level up with the empty target entrance. These
> are the values reported on the table.
> Cheers,
>     Alessandra
>
>
>
> >
> >  Ciao, Tsuneo Kageya.
> >
> >
> >
>
>
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