Reports

Report by Falk Herwig and Pavel Denisenkov on the status of the UVic-TRIUMF-JINA project to generate CO nova models using MESA WD models. February 2012.  

nova_project_update_feb2012.pdf

Author: Falk Herwig, Pavel Denisenkov

Journal:

The ¹³N(p,γ)¹⁴O reaction is very important for our understanding of explosive astrophysical sites, such as novae and supernovae. This reaction deter- mines the conditions under which the CNO cycle changes to the Hot CNO cycle, the main process of energy generation in such sites.

Since ¹³N is unstable, and is very close in mass to ¹³C, the DRAGON recoil mass separator at TRIUMF will firstly study the ¹³C(p,γ)¹⁴N reaction so that its properties can be compensated for when studying the ¹³N(p,γ)¹⁴O reaction.

Early analysis showed that not all the ¹⁴N recoils, from the ¹³C(p,γ)¹⁴N reaction, make it through the DRAGON to the end detector.

aaron-report.pdf

Author: Bebington, A. M.

Journal:

A new DSSSD mount has been installed at the end of DRAGON. The mount includes a liquid cooled cold plate which can cool DSSSDs to to temperatures as low as -10◦C. This report describes motivation for the new DSSSD mount, and its design and operation with a recirculating liquid chiller. A thorough introduction to the DRAGON DSSSD system in general can be found in [1].

coolingreport.pdf

Author: Wrede, C. L. H.

Journal:

A requirement of DRAGON experiments is to get a beam of particles to hit a target at the right position and at the right angle.  The beam particles react with the target, producing new particles, “recoils,” that travel in the same average direction as the impinging beam, but cover a much broader range of angles.  These recoils are detected when they hit a silicon detector some distance from the target.  It is necessary to have the beam of particles interact with the target at the right position and angle to maximize the number of recoils detected.  To ensure maximum detection, magnetic fields in the High Energy Beam Transport line (HEBT2) are used to tune the beam, that is adjusting the path of the beam to ensure proper position and angle at the DRAGON target.  An inherent problem is that there is no established method to tuning; it is a fancy way of fumbling with knobs until the operator gives the experimenter what he wants.  By investigating the relationship among 5 critical magnets we hoped an easier, reproducible method to tuning the beam may be found, thereby decreasing time lost in the experiment, and making life easier for the operators.

beamtuningmagnets.doc

Author: Hutcheon, D. A. & Olivieri, A.

Journal:

In the twelve months since the last EEC meeting, the DRAGON facility has essentially become operational and a physics program has started. Following a program of commissioning studies and achieving several milestones, E584 received a ²¹Na radioactive beam and observed reaction products at the final focus in a commissioning run. A brief overview of the activities with emphasis on milestones since December, 2000 are provided below. 

dragonreport.doc

Author: D'Auria, J. M. & Hutcheon, D.

Journal:

This brief report provides a summary of the status of the DRAGON facility including activities in 2002 and near term plans for the facility. A summary of results obtained from E824 will also be given. In addition beam time is requested for E811 and E805, which could not run in 2002 because of the unavailability of the ISAC ECR source.

dragonsumreport.doc

Author: D'Auria, J. M. & Hutcheon, D.

Journal: