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Simple 1.5 dimensional thermal model for CKM cavities

Inputs: Phonon Kapitza Rbcs model

peak conductance Nb (srimp=H,

He temp Ro fudge fudge thickness Solyak=S,

(K) (nOhm) factor factor (mm) Eq4.43=T)

1.800 49.4 20 1 2.20 S

Outputs: 60000

For 3.9 GHz, BCS surface resistance is

51.1 nOhm; with Ro, 100.5 nOhm Q of 2.27E+09

For 80 mT field power is 203.58 W/sq. meter

Kapitza conductance H = 6092 W/K-sq.meter, so outer

surface is at 1.833 K, & inner surface is 1.846 +- Columns G on have scratch data.

(at RRR = 300 ). 0.000 K 1.3E-06 5.5



Algorithm is to evaluate conductanc

Tinr 1.800 1.841 1.845 1.846 dZ slice to get dT, which is added t

Rbcs(srimp) 45.1 55.4 56.5 56.7 at end of slice. Kappa' then is cond

Rbcs(Hasan) 27.6 33.6 34.3 34.4 slice. The average of kappa & kap

Rbcs(Nick) 40.5 49.9 51.0 51.1 Then scale for area to get dT'. Rep

Rs 89.9 99.3 100.3 100.5

P 182.2 201.2 203.3 203.6 kappa T+dT

Z T(1) T(2) T(3) T(3) 45.8226 1.8303

2.200 1.800 1.800 1.800 1.800 19 45.8661 1.8308

2.200 1.830 1.833 1.833 1.833 18 45.9104 1.8312

2.090 1.830 1.834 1.834 1.834 17 45.9557 1.8317

1.980 1.831 1.834 1.834 1.834 16 46.0019 1.8322

1.870 1.831 1.835 1.835 1.835 15 46.0492 1.8326

1.760 1.832 1.835 1.835 1.835 14 46.0975 1.8331

1.650 1.832 1.836 1.836 1.836 13 46.1469 1.8336

1.540 1.833 1.836 1.836 1.837 12 46.1974 1.8341

1.430 1.833 1.837 1.837 1.837 11 46.2492 1.8347

1.320 1.834 1.837 1.838 1.838 10 46.3022 1.8352

1.210 1.834 1.838 1.838 1.838 9 46.3565 1.8357

1.100 1.835 1.838 1.839 1.839 8 46.4123 1.8363

0.990 1.835 1.839 1.839 1.839 7 46.4695 1.8369

0.880 1.836 1.840 1.840 1.840 6 46.5282 1.8375

0.770 1.836 1.840 1.841 1.841 5 46.5886 1.8381

0.660 1.837 1.841 1.841 1.841 4 46.6507 1.8387

0.550 1.838 1.842 1.842 1.842 3 46.7147 1.8393

0.440 1.838 1.842 1.843 1.843 2 46.7806 1.8400

0.330 1.839 1.843 1.843 1.843 1 46.8486 1.8407

0.220 1.840 1.844 1.844 1.844

0.110 1.840 1.844 1.845 1.845

0.000 1.841 1.845 1.846 1.846

G on have scratch data.

0.6



m is to evaluate conductance kappa at start of

o get dT, which is added to T(start) to get T

slice. Kappa' then is conductance at end of

e average of kappa & kappa'is used for dT'.

le for area to get dT'. Repeat 4 times.



kappa' dT' dT'' kappa T+dT kappa' dT' dT'' kappa T+dT

45.8656 0.0004 0.0004 46.1307 1.8335 46.1782 0.0005 0.0005 46.1651 1.8339

45.9091 0.0004 0.0005 46.1786 1.8340 46.2261 0.0005 0.0005 46.2136 1.8344

45.9535 0.0004 0.0005 46.2275 1.8345 46.2750 0.0005 0.0005 46.2630 1.8349

45.9987 0.0004 0.0005 46.2775 1.8350 46.3249 0.0005 0.0005 46.3135 1.8354

46.0450 0.0004 0.0005 46.3284 1.8355 46.3759 0.0005 0.0005 46.3650 1.8359

46.0922 0.0004 0.0005 46.3805 1.8360 46.4279 0.0005 0.0005 46.4176 1.8364

46.1405 0.0004 0.0005 46.4338 1.8366 46.4812 0.0005 0.0005 46.4715 1.8369

46.1899 0.0004 0.0005 46.4882 1.8371 46.5356 0.0005 0.0006 46.5265 1.8375

46.2404 0.0004 0.0005 46.5440 1.8377 46.5913 0.0005 0.0006 46.5828 1.8381

46.2921 0.0004 0.0005 46.6010 1.8382 46.6483 0.0005 0.0006 46.6405 1.8386

46.3451 0.0004 0.0005 46.6594 1.8388 46.7068 0.0005 0.0006 46.6996 1.8392

46.3995 0.0004 0.0006 46.7193 1.8394 46.7667 0.0005 0.0006 46.7601 1.8398

46.4552 0.0004 0.0006 46.7808 1.8400 46.8281 0.0005 0.0006 46.8222 1.8405

46.5124 0.0004 0.0006 46.8438 1.8407 46.8911 0.0005 0.0006 46.8859 1.8411

46.5711 0.0004 0.0006 46.9086 1.8413 46.9558 0.0005 0.0007 46.9514 1.8418

46.6315 0.0004 0.0006 46.9751 1.8420 47.0224 0.0005 0.0007 47.0187 1.8424

46.6936 0.0004 0.0006 47.0436 1.8427 47.0908 0.0005 0.0007 47.0879 1.8431

46.7575 0.0004 0.0007 47.1141 1.8434 47.1613 0.0005 0.0007 47.1591 1.8438

46.8234 0.0004 0.0007 47.1867 1.8441 47.2339 0.0005 0.0007 47.2325 1.8445

46.8914 0.0004 0.0007 47.2616 1.8448 47.3088 0.0005 0.0008 47.3082 1.8453

kappa' dT' dT'' kappa T+dT kappa' dT' dT''

46.1651 0.0005 0.0005 46.1690 1.8339 46.1690 0.0005 0.0005

46.2136 0.0005 0.0005 46.2175 1.8344 46.2175 0.0005 0.0005

46.2630 0.0005 0.0005 46.2670 1.8349 46.2670 0.0005 0.0005

46.3135 0.0005 0.0005 46.3175 1.8354 46.3175 0.0005 0.0005

46.3650 0.0005 0.0005 46.3691 1.8359 46.3691 0.0005 0.0005

46.4176 0.0005 0.0005 46.4219 1.8365 46.4219 0.0005 0.0005

46.4715 0.0005 0.0006 46.4757 1.8370 46.4757 0.0005 0.0006

46.5265 0.0005 0.0006 46.5308 1.8375 46.5308 0.0005 0.0006

46.5828 0.0005 0.0006 46.5872 1.8381 46.5872 0.0005 0.0006

46.6405 0.0005 0.0006 46.6450 1.8387 46.6450 0.0005 0.0006

46.6996 0.0005 0.0006 46.7041 1.8393 46.7041 0.0005 0.0006

46.7601 0.0005 0.0006 46.7647 1.8399 46.7647 0.0005 0.0006

46.8222 0.0005 0.0006 46.8269 1.8405 46.8269 0.0005 0.0006

46.8859 0.0005 0.0007 46.8907 1.8411 46.8907 0.0005 0.0007

46.9514 0.0005 0.0007 46.9562 1.8418 46.9562 0.0005 0.0007

47.0187 0.0005 0.0007 47.0236 1.8425 47.0236 0.0005 0.0007

47.0879 0.0005 0.0007 47.0929 1.8432 47.0929 0.0005 0.0007

47.1591 0.0005 0.0007 47.1642 1.8439 47.1642 0.0005 0.0007

47.2325 0.0005 0.0008 47.2377 1.8446 47.2377 0.0005 0.0008

47.3082 0.0005 0.0008 47.3135 1.8454 47.3135 0.0005 0.0008

1.900









1.850









1.800

T(K)









1.750









1.700









1.650









1.600

0.000 0.500 1.000 1.500 2.000 2.500

Z(mm)



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