Hello Sho and Maurik,
According to drawings that I have angle is 30.5 milirad, the distance from
the target (magnet upstream lip) to the front face of the crystals is
137.4 cm
with 4 mm error (actual measurements and drawings for magnet vacuum
chamber position relative to magnet are differ by 4mm).
I am not sure what is the electron flange.
Regards, Stepan
On 11/14/12 11:30 PM, Sho Uemura wrote:
> Front of crystals 75 mm back from front of flange according to
> Stepan's diagrams.
>
> On Wed, 14 Nov 2012, Maurik Holtrop wrote:
>
>> Hi Sho,
>>
>> The beam enters at 30.52 mrad, if we believe the trajectories of the
>> mapped fields as particles propagate through them in G4.
>>
>> When I made up the ecal geometry, the distance I was given was 51.93
>> inches from the target to the exit of the pair spectrometer vacuum
>> chamber, so 1319mm. I just verified this and that is where I still
>> have it in my simulation. That does not mean this is still the
>> correct number though. I wouldn't worry about a mm though. I think it
>> is more important that we verify the correct location of the front of
>> the crystals. I am actually not 100% sure where they should be. We'll
>> bring it up in the meeting tomorrow, and maybe Stepan or Takashi can
>> chime in.
>>
>> Best,
>> Maurik
>>
>>
>>
>>
>>
>>
>> On Nov 14, 2012, at 8:34 PM, Sho Uemura <[log in to unmask]> wrote:
>>
>>> 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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