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 >
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