iSHELL Archive Concept

A simple diagram of the iSHELL optical path

   LAMP -> GAS_CELL -> COVER -> ROT -> SLIT_WH -> DEKKER -> OSF ->  IGRAT -> XDGRAT -> H2RG
                                          \-----> GFLT   -> Aladdin
1. Summary of the iSHELL Modes  

The observer selection an XDTILT selection. Which sets the DEKKER, OSF, XDROT, XDTILTSP.

   J0          5     Jo           Jo                    future updated for Hel 1.08 (lower wlen?)

   J1          5     Jo           J         -6100000   wave_upper = (1.17x10^-8) x step_pos  + 1.295
   J2          5     Jo           J                0   wave_lower = (1.35x 10^-8) x step_pos + 1.197
   J3          5     Jo           J          5500000
   Jcus        5     Jo           J        f(up_wlen)

   H1          5     Ho           H         -2610000   wave_upper = (2.43x10^-8) x step_pos  + 1.740
   H2          5     Ho           H                0   wave_lower = (2.65x 10^-8) x step_pos + 1.549
   H3          5     Ho           H          3500000
   Hcus        5     Ho           H        f(up_wlen)

   K1          5     Ko           K          4200000   wave_upper = (3.68x10^-8) x step_pos  + 2.385
   K2          5     Ko           K                0   wave_lower = (3.65x 10^-8) x step_pos + 2.095
   Kgas        5     Ko           K          2300000
   K3          5     Ko           K          4600000
   Kcus        5     Ko           K        f(up_wlen)

   L1         15     Lo           L         -6100000   wave_upper = (3.65x10^-8) x step_pos  + 3.240
   L2         15     Lo           L                0   wave_lower = (3.65x 10^-8) x step_pos + 2.962
   L3         15     Lo           L          6500000
   Lcus       15     Lo           L        f(up_wlen)

   Lp1        15     Lo           Lp        -6100000   wave_upper = (4.60x10^-8) x step_pos  + 3.950
   Lp2        15     Lo           Lp               0   wave_lower = (4.78x 10^-8) x step_pos + 3.570
   Lp3        15     Lo           Lp         5400000
   Lpcus      15     Lo           Lp       f(up_wlen)

   Lp4        25     Lo           Lp         5400000   wave_upper=4.14um
                                                         wave_lower=3.83um

   M1         15     Mo           M1               0   wave_upper=5.25um
   M2         15     Mo           M2         -700000   wave_lower=3.83um

   Darks      n/a    blank        n/a         n/a       Sets the SLIT to Mirror.

The observer selection The SlLIT Width:

   slit menu: 0.375, 0.75, 1.5, 4.00, Mirror

How does the XUI change when custom mode are added? The user selects the custom 
mode, and inputs the upper or lower wavelen.  The GUI can show the upper/lower 
for all modes.

      Mode: [xdtile_menu]   wlen [upper] to [lower]   (for custom, user enter upper wlen).
   SlitWid: [slit_menu]
      
2. What are the Archive Keywork provide to IPAC? 

   XDTILT - XDTILT keywork and value from the FITS file.
   WLEN_UPPER - Upper wavelen. An equation for each XDROT provides the step to wavelen value.
   WLEN_LOWER - Lower wavelen. An equation for each XDROT provides the step to wavelen value.
   SLIT   - SLIT keywork and value from the FITS file.

   Cartman web search widgets:              
           XDMODE: [XDTILT pull down_menu ]      // Filter Data based on XDTILT.
                                                    Also include J, H, K, L, Lp, M to the menu
      custom_wlen: [       ]  to   [        ]    // if user provide lower/upper wavelen
                                                    filter data based on WLEN_UPPER/LOWER
          SlitWid: [SLIT iSHELL menu ]           // Filter data based on SLIT

   Kyle:                                    
      GFLT: K, Jo, PV, Blank, nbM, 3.46um, L, Kcont

3. how are dark handled. How are they linked to obsgroup FITS files?  

   A project account for Darks if data can be taken within 24 hrs.
   Otherwise Observer sill need to nod the telelscope during their observing time.

4. What are the plan for time stamping. Is the current accuray ok, and what is the accuracy?  

   milliseconds accuracy.