The most recent field off runs are 13154-13157 but I believe the
holding field was on.
Cheers,
Douglas
26-415 M.I.T.
Tel: +1 (617) 258-7199
77 Massachusetts Avenue Fax: +1 (617)
258-5440
Cambridge, MA 02139, USA E-mail:
hasell@mit.edu
On Apr 22, 2005, at 6:44 PM, Michael Kohl wrote:
> Hi Taylan,
>
> is your suggestion to do more field-off running based on insufficient
> statistics or data quality of the so far taken field-off runs?
> I'm not sure completely, but I think that we have taken some of these
> runs
> with the present configuration, haven't we?
> Were really all fields off including the holding field in those runs?
>
> Regards,
>
> Michael
>
>
>
> On Fri, 22 Apr 2005, Taylan Akdogan wrote:
>
>> Hi Doug,
>>
>> I find neural network (yours and more general methods) approach
>> for the event reconstruction intriguing. For -satisfying- future
>> curiosity, it would be nice to have -more- Field-Off (Blast AND
>> Holding
>> field) data with blast where new approaches can be tested
>> -relatively- easily. Field off data reduces the complexity of the
>> fitting, by introducing two coupled -left-right- set of information,
>> and removing -any- possible higher degree of local uncertainties in
>> magnetic field due to materials in the volume and holding field near
>> vertex: like pumps on the road.
>>
>> Off course, this can not be justified just to satisfy a curiosity
>> which is not guaranteed to be pursued. If you think any other
>> reason for Field-Off data (such as detector alignment) from which
>> Blast can benefit, you can also consider it to be a potential
>> resource for new analysis techniques. Something to think about...
>>
>> Taylan
>>
>> --
>> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>> Taylan Akdogan Massachusetts Institute of Technology
>> akdogan@mit.edu Department of Physics
>> Phn:+1-617-258-0801 Laboratory for Nuclear Science
>> Fax:+1-617-258-5440 Room 26-559
>> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>>
>> On Apr 22, 2005, at 2:46 PM, Douglas Hasell wrote:
>>
>>> Dear Colleagues,
>>>
>>> As you are hopefully aware BLAST will run until May 31. After that
>>> there will be approximately 1 week for TeraHz studies and then we
>>> will
>>> make some final calibration measurements. So far these include:
>>>
>>> - surveying the detector position (primarily the wire chamber but
>>> also the sub-detector frame) - 1 week
>>> - map the target holding field - <1 week
>>> - map the toroidal field - 2 weeks
>>>
>>> We will try to do enough empty and unpolarised H and D runs before
>>> the end of May during the normal running.
>>>
>>> We will also try to get as many cosmic runs as possible within the
>>> TeraHz period, as well as during the survey and holding field
>>> measurements, after hours, as possible.
>>>
>>> But please realise that after the end of May BLAST will start to be
>>> disassembled and it will be non-reversible except with great pain and
>>> suffering.
>>>
>>> For the holding field maps the target cell will be removed.
>>>
>>> For the toroidal field map, after a preliminary set of measurements
>>> are made at a small number of points with the wire chambers in place;
>>> the wire chambers will be removed. This means all neutron detectors
>>> and the lead glass will also be de-cabled and removed. TOF's and
>>> Cerenkov's will stay in place but will be de-cabled. BAT's may also
>>> need to be de-cabled and possibly removed.
>>>
>>> So, if there are any other measurements or tests that should be
>>> done;
>>> please let me know as soon as possible.
>>>
>>>
>>> Cheers,
>>>
>>> Douglas
>>>
>>> 26-415 M.I.T.
>>> Tel: +1 (617) 258-7199
>>> 77 Massachusetts Avenue Fax: +1
>>> (617)
>>> 258-5440
>>> Cambridge, MA 02139, USA E-mail:
>>> hasell@mit.edu
>>>
>>
>>
>
> --
>
> +-------------------------------------+--------------------------+
> | Office: | Home: |
> |-------------------------------------|--------------------------|
> | Dr. Michael Kohl | Michael Kohl |
> | Laboratory for Nuclear Science | 5 Ibbetson Street |
> | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
> | Middleton, MA 01949 | U.S.A. |
> | U.S.A. | |
> | - - - - - - - - - - - - | - - - - - - - - -|
> | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
> | Work: +1-617-253-9207 | Home: +1-617-629-3147 |
> | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
> | http://blast.lns.mit.edu | |
> +-------------------------------------+--------------------------+
>
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