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imagerteleconnotes20180523

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imagerteleconnotes20180523 [2018/05/23 16:43] – wenxx181imagerteleconnotes20180523 [2018/05/23 17:20] (current) – hanany
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   * Temperature Stability and effects on responsivity variations   * Temperature Stability and effects on responsivity variations
     * {{::peter_shirron_adr_stability.pptx|Shirron workshop presentation}}     * {{::peter_shirron_adr_stability.pptx|Shirron workshop presentation}}
-  * {{::sensitivity_vs_frequency_may19th_2018.pdf|noise/band Figure}}+  * {{::sensitivity_vs_frequency_may19th_2018.pdf|noise/band Figure}} and  {{::sensitivity_vs_frequency_may23rd_2018.pdf|Revised noise/band Figure}}
  
 === Notes === === Notes ===
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   * Jacques: how 3K will be modulated; on ground, noise from all sorts of things are dominant, but in space, this source could be dominant in fluctuation    * Jacques: how 3K will be modulated; on ground, noise from all sorts of things are dominant, but in space, this source could be dominant in fluctuation 
   * T_focalplane and T_ADR   * T_focalplane and T_ADR
-    * time constant C/G: focalplane ~30 kg, C is not hard to estimate, but G may be. **Ask Chris Payne to calculate (AI)**.+    * time constant C/G: focalplane ~30 kg, C is not hard to estimate, but G may be. **Ask Chris Payne to estimate (AI)**. 
 +    * Peter: two different time constants, internal of arrays and between ADR and system. Internal time constant of array is also important. 
 +  * Planck active T control 
 +    * Jacque: Very long time constant, the fluctuation from dilution does not transfer to focal plane; most fluctuations were from cosmic rays 
 +    * Shaul: why was active control still useful if time constant was large? **Check with Brandon (AI)** 
 +  * The plot is from 4-stage, 4k to low T; 5-stage should outperform with 1K 
 +    * Shaul: 1K stage would have its own fluctuation 
 +    * Peter: ASTRO-H lab tests with full space instruments, 3 ADR: 2 upper stage + 1.5 K constant. Fluctuation was within 1mK. Two modes, ADR with liquid helium and without helium. Turned out without was more stable, gave better detector resolution, because of more stability under ADR; with helium, there were drifts. 
 +      * did not do in-space test due to computation limit on board 
 + 
 +Noise/band Figure 
 +  * Jacques: this one is mostly wrong, no need to discuss. A lot things have been fixed. 
 +  * Jacques sends a new figure for Shaul to present. Units are consistent between bands and signals. 
 +  * Synchrotron not completely clear 
 +  * BB dominated by lensing 
 +  * Shaul: six dark blue bands are wrong, should be three 
 +  * CO lines 
 +  * Current units are for broader community, who do not understand uK. 
 + 
 + 
 +Shaul will be gone for next 3 weeks until June 18th. After Shaul comes back, report writing mode. 
 + 
  
  
imagerteleconnotes20180523.1527111794.txt.gz · Last modified: 2018/05/23 16:43 by wenxx181

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