TES key development Issues

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# TES key development Issues - PowerPoint PPT Presentation

TES key development Issues. Energy resolution Aim for 1 eV type resolution for E &lt; 1 keV Field of view Increase of pixel size to typically 5/3 – 5/2 arc sec ≡ 416 - 625 μ m (settle on 500 μ m) Increase of pixels above 32 x 32 elements (wait for array and read-out developments going-on)

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### TES key development Issues

• Energy resolution
• Aim for 1 eV type resolution for E < 1 keV
• Field of view
• Increase of pixel size to typically 5/3 – 5/2 arc sec ≡ 416 - 625 μm (settle on 500 μm)
• Increase of pixels above 32 x 32 elements (wait for array and read-out developments going-on)
• Count rate ability
• TES limited to approximately 0.1 ms speed

XEUS Cryogenic Instrument 26 - 27 October 2004

Energy resolution limit is given by:

### TES key development Issues

with ESAT given by

Measured value of EFWHM = 4 eV for C = 0.5pJ/K, α = 70, and T = 100 mK is a factor 3 worse than theory. This is partially due to excess noise and partially due to non-optimum data analysis algorithm. A better data-analysis algorithm should result in 2.5 – 3 eV.

Saturation energy equals ≈ 10 keV for r = 0.1

Reduction of the saturation energy to 2.5 keV, C ≈ 1.25 10-13 J/K, would therefore result in an energy resolution improvement by a factor 2.0

Present schemes would than result in ≈ 2 eV energy resolution, while with better data analysis about 1.3 eV is expected.

Better understanding and reduction of the excess noise might result in a limit of 0.6 eV FWHM

XEUS Cryogenic Instrument 26 - 27 October 2004

Energy resolution limit vs pixel size

• We can manufacture standard type pixels with a heat capacity C= 0.125 pJ/K and up to 250 x 250 μm2
• 0.05 pJ/K for TiAu TES
• 0.06 pJ/K for Cu/Sn and 0.08 pJ/K for Cu/Bi absorber
• Larger pixels will require different designs. Scaling to .5 x .5 mm pixels seems quite well feasible by
• Reduction of the fill factor TES/Multiple small TES in parallel
• Non-continuous Cu-layer beneath Bi/Sn absorber
• Pixels in access of 0.5 x 0.5 mm can most probably not be produced with a saturation at 2.5 keV and its corresponding energy resolution

### TES key development Issues

XEUS Cryogenic Instrument 26 - 27 October 2004

single pixel optimization

• single pixel production by micro-electronics techniques
• Array production development
• SQUID development and optimization
• How we can use expertise build up for TES development for support of the magnetic sensor line?

### Magnetic sensor key development Issues

XEUS Cryogenic Instrument 26 - 27 October 2004

Prove of good energy resolution for large DROID’s

• Arraying of DROID’s