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HPS-SOFTWARE  November 2012

HPS-SOFTWARE November 2012

Subject:

Re: new detector geometry for proposal

From:

Sho Uemura <[log in to unmask]>

Reply-To:

Software for the Heavy Photon Search Experiment <[log in to unmask]>

Date:

Wed, 14 Nov 2012 17:34:07 -0800

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (132 lines)

Okay, great, that clears up almost everything. A few last questions:

* Beam enters at 30, 30.5, or 31 mrad? From Maurik's table it looks like 
30.5, but I've heard all three of these numbers, so . . .

* What is the distance between the target/lip of the magnet and the front 
face of the flange? Maurik's e-mail gives both 1319 and 1318 mm.

* Where exactly is the electron flange in X?

If there's an engineering drawing of the flange that would be nice, just 
so I can check it against the GDML of the flange.

It looks like there was some discussion at the 10/18 software meeting
about things that needed to be done to the geometry, and among these were
ECal and ECal flange updates. Is there anything specific that was meant by 
that? Who was going to do that? Was anything actually done?

On Wed, 14 Nov 2012, Stepan Stepanyan wrote:

> Hello Sho,
>
> There were several email exchanges on the subject while I was trying to 
> finish mine, so sorry for
> repeats. I attached a file with geometry of ECal, vacuum chamber and the 
> analyzing magnet, slides 2 and 3.
>
> As for your numbers, (a) I remember 31 mrad, (b) if target is at the lip of 
> the analyzing magnet and
> we take it as Z=0, than center of the analyzing magnet should be 18 inches 
> away, 45.72 cm, (c) ECal
> is not symmetric around the magnet and Z-axis, (d) see ECal flange and hole 
> locations in the attached
> file.
>
> I am also attaching another file showing positions at May run, that file has 
> distance of crystals from the flange.
>
> I am sure you have seen these before, but just in case, it will help to 
> finalize the geometry.
>
> Regards, Stepan
>
> On 11/13/12 9:35 PM, Sho Uemura wrote:
>> Those are sections, not perspectives. They should be literally what you 
>> would see if you cut through the detector at the specified z.
>> 
>> The flange appears to be positioned so the photon hole is somewhat to one 
>> side and angled out - if you look closely at the sections you can see that 
>> the photon hole is further from the center at z=150 than it is at z=137.
>> 
>> I've attached two perspective views of the whole geometry.
>> 
>> 
>> 
>> Relevant people, please comment on whether these statements are correct, 
>> with (0, 0, 0) being the beam spot on target and the Z-axis being parallel 
>> to the magnet bore:
>> 
>> * This is the frame we want to use for SLIC/LCSim.
>> 
>> * Beam enters at an angle of 30 mrad from Z, pointing into the positron 
>> side.
>> 
>> * Center of the analyzing magnet is at z = 45.22 cm.
>> 
>> * SVT is rotated 30 mrad into the positron side.
>> 
>> * ECal is completely symmetric around the Z-axis (aside from the missing 
>> crystals). Front face is at z = 137 cm.
>> 
>> * ECal flange has photon hole shifted 16 mm to the positron side at the 
>> front face of the flange (z = 135 cm), and 30 mm to the positron side at 
>> the rear face (z = 179 cm).
>> 
>> * ECal flange has electron bulge at the size and shape seen on my sections.
>> 
>> That's what I see in this geometry. If any of these statements are false, 
>> we need to fix the geometry to match.
>> 
>> 
>> 
>> On Tue, 13 Nov 2012, Maurik Holtrop wrote:
>> 
>>> Hello Sho,
>>> 
>>> I am a little confused about the pictures that you are drawing. The top 
>>> one seems to have a vacuum "bulge" area that is too small. The "bulge" is 
>>> supposed to fill up the gap of all the crystals that were removed. Is that 
>>> some effect of the perspective?
>>> 
>>> The other issue is that the photon hole should be right through the center 
>>> of the ECAL.
>>> 
>>> Best,
>>>     Maurik
>>> 
>>> Looking along the beam line, +x towards the left, +y towards the top.
>>> 
>>> 
>>> On Nov 13, 2012, at 7:11 PM, Sho Uemura <[log in to unmask]> wrote:
>>> 
>>>> Okay, here's some sections of the flange at different values of Z; center 
>>>> of viewer is (0,0) I think - I have no idea what I'm doing but I managed 
>>>> to get SLIC to display the geometry.
>>>> 
>>>> Looking at the Z=150 view, it looks like the photon hole is ~15 mm 
>>>> (somewhat more than one crystal width) from the center, where you'd want 
>>>> it to be at (150 cm)*(30 mrad) = 45 mm?
>>> 
>>> 
>>> ########################################################################
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>>> 
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>>> 
>> 
>> ########################################################################
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>
>

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