tuning_the_s800_xdt
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tuning_the_s800_xdt [2015/10/26 14:05] pereira [Setting up Reaction Settings] |
tuning_the_s800_xdt [2015/10/26 14:07] pereira [Setting up Reaction Settings] |
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| ===== Reaction Setting ===== | ===== Reaction Setting ===== | ||
| - | ===== Setting up Reaction Settings ===== | ||
| - | |||
| - | * Calculating reaction setting | ||
| - | * Center unreacted beam at S800 FP | ||
| - | * Adjust spectrograph Brho to center beam at S800 FP | ||
| - | * Requirements for a beam to be “Centered” | ||
| - | * Spectrograph dipoles matched | ||
| - | * Beam position within about 1 cm of center as judges by 0 point on crdc1x spectrum or on track.xfp spectrum | ||
| - | * Record run to disk to document centered unreacted beam setting | ||
| - | * Calculate reaction setting using “effective” beam energy and the nominal target thickness | ||
| - | * Ideally, experimenters should be the ones making this calculation | ||
| - | * This approach assumes that the target thickness is known | ||
| - | |||
| - | |||
| - | * Reaction setting to FP | ||
| - | * Start with Attenuator setting of unreacted beam and step up in intensity | ||
| - | * Set up beam blocker, if necessary | ||
| - | * Expect to see unreacted beam if reaction setting is within +/- 3% of unreacted beam setting | ||
| - | * Should have to move only one of the two blockers unless charge states are present | ||
| - | * A graphic tool is available to help (not yet calibrated) | ||
| - | * Try to cut only as much as necessary; depends on | ||
| - | * What rate limits allow | ||
| - | * What experimenters want (e.g., if they want singles, the cut has to be more restrictive to limit acquisition deadtime) | ||
| - | * Move blocker, decrease attenuator, repeat | ||
| ==== Coincidences ==== | ==== Coincidences ==== | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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