This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
tuning_the_s800_xdt [2015/10/26 13:58] pereira [Checking Particle ID and rate at S800 FP] |
tuning_the_s800_xdt [2015/10/26 14:01] pereira |
||
---|---|---|---|
Line 202: | Line 202: | ||
* Check the run time and live time from the corresponding scaler file in directory **/ | * Check the run time and live time from the corresponding scaler file in directory **/ | ||
* Calculate the rate and purity and compare with the value in the A1900 FP to determine the transmission | * Calculate the rate and purity and compare with the value in the A1900 FP to determine the transmission | ||
+ | |||
+ | |||
+ | |||
+ | |||
Line 209: | Line 213: | ||
==== Analysis line classic PPAC setup (Focus optics only) ==== | ==== Analysis line classic PPAC setup (Focus optics only) ==== | ||
+ | |||
* " | * " | ||
* Classic PPACs have rate limitations from pileups | * Classic PPACs have rate limitations from pileups | ||
Line 232: | Line 237: | ||
==== Setup beamline ==== | ==== Setup beamline ==== | ||
+ | |||
* Object and XF scintillators and intermediate image PPACs inserted if they will be used | * Object and XF scintillators and intermediate image PPACs inserted if they will be used | ||
* If Object scintillator will not be used, there is no reason to look at beam on it unless to debug a problem with the transmission | * If Object scintillator will not be used, there is no reason to look at beam on it unless to debug a problem with the transmission | ||
* Set spectrograph Brho for unreacted fragment | * Set spectrograph Brho for unreacted fragment | ||
+ | |||
==== Start scalers ==== | ==== Start scalers ==== | ||
+ | |||
* Use s800 account | * Use s800 account | ||
Line 254: | Line 262: | ||
=== Focused optics === | === Focused optics === | ||
+ | |||
* Expectations for A1900 FP to S800 FP transmission | * Expectations for A1900 FP to S800 FP transmission | ||
* 80% or better for mid-Z fragments | * 80% or better for mid-Z fragments | ||
Line 269: | Line 278: | ||
=== Matched optics === | === Matched optics === | ||
+ | |||
* Typically much more time is invested for optimizing optics for matched optics than for focused optics | * Typically much more time is invested for optimizing optics for matched optics than for focused optics | ||
Line 283: | Line 293: | ||
==== Setting up Reaction Settings ==== | ==== Setting up Reaction Settings ==== | ||
+ | |||
* Calculating reaction setting | * Calculating reaction setting | ||
* Center unreacted beam at S800 FP | * Center unreacted beam at S800 FP | ||
Line 307: | Line 318: | ||
==== Coincidences ==== | ==== Coincidences ==== | ||
+ | |||
* Overview | * Overview | ||
* Most experiments at the S800 involve setting up an auxiliary detector system (e.g. SeGA, HiRA, etc) to be used in coincidence with the standard detectors of the S800. | * Most experiments at the S800 involve setting up an auxiliary detector system (e.g. SeGA, HiRA, etc) to be used in coincidence with the standard detectors of the S800. | ||
Line 392: | Line 404: | ||
====== Dispersion Matching tuning ====== | ====== Dispersion Matching tuning ====== | ||
+ | |||
In the dispersion-matching optics, the S800 focal point is achromatic, i.e. the position of the beam in the dispersive direction does not depend on the momentum. As a consequence, | In the dispersion-matching optics, the S800 focal point is achromatic, i.e. the position of the beam in the dispersive direction does not depend on the momentum. As a consequence, | ||