C100 Cryomodule End Can Pipeline Design per ASME B31

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JLAB-TN-08-023Thermal Analysis of C100 Cryomodule Coaxial Heat Station and RF CablesTable 7 Double coaxial station design total heat loads and peak temperaturesConnectionTransmittedpower, Wattsq_2K,mWq_LHe,mWq_50K,mWq_300K,mWT_max,K41-5K-27 10 373.53 1127.70 518.00 278.00 94941-5K-27 1 7.48 187.44 406.79 -461.99 30041-5K-27 0.125 2.00 145.91 397.98 -530.57 300402-5K-89 10 577.63 1704.84 499.00 751.40 2676402-5K-89 1 8.54 186.68 345.55 -308.40 421402-5K-89 0.125 1.50 103.53 333.72 -417.13 30041-5K-41 10 45.43 839.40 517.10 277.90 94941-5K-41 1 5.90 184.84 406.78 -461.99 30041-5K-41 0.125 2.27 145.15 397.97 -530.57 300402-5K-402 10 62.18 1204.36 497.50 751.40 2675402-5K-402 1 6.64 182.63 345.54 -308.40 421402-5K-402 0.125 1.68 102.61 333.72 -417.13 30027-5K-27 1 1.34 197.15 271.06 -167.60 69227-5K-27 0.125 1.46 79.27 254.32 -306.95 30089-5K-89 1 8.90 232.86 153.32 46.70 158789-5K-89 0.125 1.31 54.84 131.45 -141.77 334Thermal Performance of No Coaxial Heat Station DesignFor low RF power applications, a straight coaxial cable that is heat sunk by a 50K clampcould be a simple and economical design option for transmitting the HOM signal to outside. Thestatic, dynamic, and total heat loads to the 2K niobium probe, 50K thermal shield, and 300Kwarm boundary are analyzed for the mentioned four types of coaxial cables. The results arepresented in Tables 8, 9, and 10 for information. For example, the connection “41-41” means anominal 8-feet Gore type 41 cable is used between 2K probe and the external feedthrough. Thecable is heat sunk to 50K thermal shield by use of a clamp. By comparing the total heat transferto 2K probe in all design options for same type of cable cases, it is easy to find that no coaxialheat station design has much more heat dumped to 2K. The ratios range from 18 to 147.Table 8 No coaxial heat station design static loadTransmittedConnectionpower,Wattsqs_2K,mWqs_50K,mWqs_300K,mW41-41 10, 1, 0.125 182.90 384.20 -567.1402-402 10, 1, 0.125 113.50 324.30 -437.727-27 1, 0.125 79.98 247.50 -327.589-89 1, 0.125 41.44 127.30 -168.712/23
JLAB-TN-08-023Thermal Analysis of C100 Cryomodule Coaxial Heat Station and RF CablesTable 9 No coaxial heat station design dynamic loadTransmittedConnectionpower,Wattsqd_2K,mWqd_50K,mWqd_300K,mW41-41 10 648.10 76.95 772.0041-41 1 31.32 7.36 60.7841-41 0.125 3.33 0.92 6.97402-402 10 1069.00 97.83 1151.00402-402 1 72.10 9.12 108.70402-402 0.125 5.18 1.13 10.5727-27 1 117.40 13.87 147.6027-27 0.125 7.34 1.71 14.4389-89 1 187.20 20.13 209.1089-89 0.125 14.07 2.44 23.58Table 10 No coaxial heat station design total heat loadTransmittedConnectionpower,Wattsq_2K,mWq_50K,mWq_300K,mWT_max,K41-41 10 831.00 461.15 204.90 81841-41 1 214.22 391.56 -506.32 30041-41 0.125 186.23 385.12 -560.13 300402-402 10 1182.50 422.13 713.30 2511402-402 1 185.60 333.42 -329.00 365402-402 0.125 118.68 325.43 -427.13 30027-27 1 197.38 261.37 -179.90 61727-27 0.125 87.32 249.21 -313.07 30089-89 1 228.64 147.43 40.40 150089-89 0.125 55.51 129.74 -145.12 317Comparison of HOM RF Passages in Horizontal Test Bed (HTB)Figure 8 shows a view of the HTB test module that contains two cavities. The test setupincluded three types of HOM signal passages: 1) microwave path contains one SMA femalefemalebullet and two coaxial RF cables, 2) path contains one coaxial heat station and twoconnecting cables, and 3) path made of one coaxial RF cable. Figure 9 shows the RF cablingdetails [6] in the HTB test module. The 50K cable clamp is positioned at approximately 2-feetfrom the tophat end.Test results show that the connection using one coaxial heat station yields the lowesttemperature at 2K probe. That indicates the coaxial heat station is effective in removing the RFheating in HOM microwave transmission. Nevertheless, the C100 CM adopts no coaxial heatstation design notion, using TFlex 402 cable, since the observed temperature at 2K probe is13/23
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C100 Cryomodule End Can Pipeline Design per ASME B31

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