Generic Inner Calibration Source

The Generic inner calibration source consists of the following regions:-

• Region IDRG_ICALI_OVL, represents the outer detector volume and can be any of the primitives: sphere, cylinder, block, elliptical cylinder, half-elliptical torus, half-square torus, torus segment or spherical tile. This region must be enabled when using the generic source and must contain all inner regions listed below.
• Region IDRG_ICALI_IVL, represents the first inner volume contained within IDRG_ICALI_OVL. It may also be any of the primitives previously listed.
• Region IDRG_ICALI_IVL2, represents the second inner volume contained within IDRG_ICALI_OVL. It may be any of the primitive shapes listed.
• Region IDRG_ICALI_IIVL21, represents the first ``inner-inner'' volume contained within IDRG_ICALI_IVL2. If IDRG_ICALI_IVL2 is disabled, this region is contained directly within IDRG_ICALI_OVL. It may be any of the primitive shapes listed.
• Region IDRG_ICALI_IIVL22, represents the second ``inner-inner'' volume contained within IDRG_ICALI_IVL2. If IDRG_ICALI_IVL2 is disabled, this region is contained directly within IDRG_ICALI_OVL. It may be any of the primitive shapes listed.

User Control

The user can enable a calibration source placed anywhere in the D2O. This source currently consists of two concentric spheres or cylinders or a combination of them. To enable such a source the GEDP and GEDS banks 130 and 140 for the calibration source inner and outer volumes should be altered to have the appropriate:-

• Position and orientation of the source in the GEDP banks. The unity rotation matrix and null translation vector will put an object in the centre of the detector with the major axis pointing up. The inner and outer volumes MUST have the same rotation and translation.

• Sizes and shape (sphere or cylinder) of the inner and outer volumes in the GEDS banks. The first (and only) primitive should be either:-
  • A sphere: Primitive type = 1, Primitive data word 2 = radius.

  • A cylinder: Primitive type = 2, Primitive data word 2 = radius, Primitive data word 3 = half height.

  and they could be of the different type e.g. a combination of a sphere or a cylinder.

• Volumes in Primitive data word 1 of the GEDS banks. The inner volume must be the solid volume, but for the outer volume it should be:-
  • The shell volume if the inner and outer volumes are the same type.

  • The solid volume if the inner and outer volumes are different.

• Physical media codes, which for the three proposed sources which this generic calibration source can approximate are :-

  
  
  

  Source	Outer Volume Media	Inner Volume Media
  $^{16,17}$N	Dark Acrylic	Air
  $^{8}$Li	Stainless Steel (?)	Air
  Cf	Standard Acrylic	Standard Acrylic

  
  
  

In addition the enable flag in both GEDS banks should be set. Note that SNOMAN comes complete with a set of command files (see the .cmd files) including ones that implement all the above changes as sets of SET BANK commands.