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| file:jbhd4.jpg|This is the apparatus that will hold the active collimator. | | file:jbhd4.jpg|This is the apparatus that will hold the active collimator. |
| file:jbhd5.jpg|A pic of me next to the future home of the active collimator. Photo credit to Sascha. | | file:jbhd5.jpg|A pic of me next to the future home of the active collimator. Photo credit to Sascha. |
− | file:jbhd6.jpg| You can see the hole through which the photon beam will travel in this pic. The blue housing is a magnet to deter the electrons and positrons formed by pair production. | + | file:jbhd6.jpg| You can see the collimating hole through which the photon beam will travel in this pic; it is 3.4 mm in diameter, and is comprised of a 30 cm long tungsten block. There is also a 5 mm diameter hole (to the left). |
− | file:jbhd7.jpg| The backside of the magnet in the previous pic. | + | file:jbhd7.jpg| The backside of the collimator in the previous pic. |
− | file:jbhd8(2).jpg|The second, "primary" collimator. | + | file:jbhd8(2).jpg| A 0.8 T permanent magnet which is used to sweep away the various particles (positrons, electrons, compton, showers, etc) from the result of collimation. |
| file:jbhd8.jpg| A downstream shot of the collimator cave. That's Sascha on the right. | | file:jbhd8.jpg| A downstream shot of the collimator cave. That's Sascha on the right. |
− | file:jbhd10.jpg| A piece of equipment to eliminate the secondary photon "halo" around the photon beam. | + | file:jbhd9.jpg| A vacuum chamber. The particles that form as a result of the collimation will be steered into a lead block that will be installed below it. |
| + | file:jbhd10.jpg| A second collimator to eliminate the secondary photon "halo" around the photon beam. The halo is a result of primary collmation. |
| file:jbhd11.jpg| A second magnet. | | file:jbhd11.jpg| A second magnet. |
− | file:jbhd12.jpg| This is where the collimated beam will exit the second magnet. | + | file:jbhd12.jpg| This is where the collimated beam will exit the second, less powerful permanent magnet. |
| file:jbhd13.jpg| An upstream view of the "Collimator Cave." | | file:jbhd13.jpg| An upstream view of the "Collimator Cave." |
| file:jbhd14.jpg| The collimated beam will travel through this opening to the main room of Hall D, where the Barrel Calorimeter (BCAL) and Forward Calorimeter (FCAL) are located. | | file:jbhd14.jpg| The collimated beam will travel through this opening to the main room of Hall D, where the Barrel Calorimeter (BCAL) and Forward Calorimeter (FCAL) are located. |
| </gallery> | | </gallery> |