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HPS-SOFTWARE  November 2013

HPS-SOFTWARE November 2013

Subject:

Re: 2.2 GeV Detector Magnetic Field

From:

Sho Uemura <[log in to unmask]>

Reply-To:

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

Date:

Thu, 14 Nov 2013 09:03:08 -0800

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (109 lines)

Field strength is set correctly. There is some uncertainty about the
correct length for the box field; v4 and older use the physical length of
the magnet bore (36 inches = 91.44 cm) and v5 uses the FWHM of the
measured field at y = 0 (108 cm), which should give approximately the
correct integrated field.

Note the field definition in v5 has changed in the last couple of weeks
(this is what we mean by "not yet a production detector" - we're still
making changes in CVS).

A good test is to manually fire single beam-energy electrons into the
detector and see where they go. "slic -n" will give you a Geant4
interactive shell, and there are tutorials online for what you can do
there.

There are tools for viewing stdhep events, but probably the easiest thing
for you to do is to look at the MCParticles in the SLIC output in JAS. The
stdhep particles should all be copied there; there will also be secondary
particles.

On Thu, 14 Nov 2013, Kyle McCarty wrote:

> Hello Takashi,
>
> I used the 2.2 GeV geometry (which does list a field strength of 0.5 T),
> but I did not set anything else. Is there another place I need to manually
> specify this?
>
> Thanks,
>
> Kyle
>
>
> On Thu, Nov 14, 2013 at 11:36 AM, Maruyama, Takashi
> <[log in to unmask]>wrote:
>
>> To maintain the chicane configuration, the magnetic field strength must
>> scale with the beam energy: 1.5 Tesla at 6.6 GeV and 0.5 Tesla at 2.2 GeV.
>> Is the field set correctly at 2.2 GeV?
>> Takashi
>>
>> -----Original Message-----
>> From: [log in to unmask] [mailto:
>> [log in to unmask]] On Behalf Of Kyle McCarty
>> Sent: Thursday, November 14, 2013 8:32 AM
>> To: hps-software
>> Subject: 2.2 GeV Detector Magnetic Field
>>
>> Hello hps-software,
>>
>>
>> I was performing an analysis on 2.2 GeV data as an extension of the
>> analysis I performed for the 6.6 GeV data earlier, and noticed a bit of an
>> anomaly. It appears that the beam is angled too strongly toward the
>> electron side of the detector. If we consider, say, the background hits
>> above 50 MeV, we can see that the center of the beam seems to be nearly to
>> the electron edge of the beam hole.
>>
>>
>> These were generated using
>>
>>
>> hps-detectors/detectors/HPS-Proposal2014-v4-2pt2/HPS-Proposal2014-v4-2pt2.lcdd
>>
>> hps-detectors/detectors/HPS-Proposal2014-v5-2pt2/HPS-Proposal2014-v5-2pt2.lcdd
>>
>>
>> for the V4 and V5 geometries respectively. I used SLIC version 3.1.1 and
>> GEANT4 version 9.6.1.
>>
>> Is this an issue with the magnetic field alignment in the geometry?
>> Perhaps the alignment of the beam in the data files? If it is the latter,
>> how would I check that?
>>
>>
>> I have attached the plots I generated for the background for reference.
>> The naming convention is "CalorimeterHits_XXXX" where XXXX is the energy
>> cut applied in MeV. Also, as a comparison, I have attached a 6.6 GeV
>> background plot as well.
>>
>>
>> Thanks,
>>
>> Kyle
>>
>>
>> ________________________________
>>
>>
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>>
>>
>
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