$^3$H(p,$\gamma$)$^4$He Calibration Source

This is a compact ion source which produces 19.8 MeV $\gamma$-rays through the radiative capture reaction $^3$H(p,$\gamma$)$^4$He. In SNOMAN, this source is modelled as a concatenation of 9 different regions. Each region consists of 1 or more cylindrical primitives:

Region	Description	No. of	Media
		Primitives
181	Deployment capsule	3	Stainless steel
182	Capsule inner volume	1	Air
183	Magnet outer volume	1	Barium ferrite feroxdur
184	Magnet inner volume	1	Air
185	Beam pipe outer volume	10	Stainless steel
186	Beam pipe inner volume	3	Air
187	Glass insulator	3	Pyrex glass
188	Electrodes and target	5	Stainless steel
189	Electrode inner volume	5	Air
190	Target mount	1	Copper
191	Acrylic inserts	2	Acrylic
192	Inserts' inner volume	3	Air
193	Polyethylene inserts	2	Polyethylene

User Control

The orientation of the primitives relative to each other has been set in the respective GEDS banks. Therefore, it is not necessary for the user to change the rotational matrix and the translational vector in the GEDS banks. In fact, the users are urged not to change any of the entries in the any of the GEDS banks for this source.

To enable this source, the enable flag in each of the GEDS banks must be turned on. There is a command file CALIBRATION_PTG.CMD to perform this task.

It is possible to move the source inside the D$_2$O volume. To accomplish this task, one only needs to set the translational vector and rotational matrix for the source capsule region ICALI_PTG_OVL. The default for the rotational matrix is the 3$\times$3 unit matrix and the default setting for the translational vector in the GEDP banks is a null vector. The user can make the necessary transformations in the CALIBRATION_PTG.CMD command file.