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Azimuthal Power Distribution in IDS120j Without Resistive Magnets

Simulations comparing the azimuthal power distribution in SC#7, SC#8, and SC#9 in Cryostat #3 of the modified Hg module without resistive magnets. Comparison with FLUKA studies.

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Azimuthal Power Distribution in IDS120j Without Resistive Magnets

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  1. IDS120j WITHOUT RESISTIVE MAGNETS: NEW Hg MODULE SC#7, SC#8, SC#9 ( IN CRYOSTAT #3 ) AZIMUTHAL TDPD DISTRIBUTION Nicholas Souchlas ( PBL ) [ 10/24/2013 ] 1

  2. IDS120j GEOMETRY, NO RESISTIVE MAGNETS: WITH 20 cm GAPS BETWEEN CRYOSTATS *********************************************************** # MODIFIED Hg MODULE SIMULATES VAN GRAVE'S DESIGN. AZIMUTHAL POWER DISTRIBUTION IN SC#7, SC#8, SC#9 IN CRYOSTAT#3. COMPARISON WITH FLUKA STUDIES. *********************************************************** ➡SIMULATIONS CODE: mars15 (2010)[ USING MCNPDATA x-SECTION LIBRARIES FOR NEUTRON INTERACTIONS WITH KE < 14 MeV ] ➡NEUTRON ENERGY CUTOFF:10-12 GeV ➡SHIELDING: 60% W + 40% He [WITH STST VESSELS ] ➡ Bz ( r = 0, z ) : 15 T [ z = -37.5 cm ] ---➜ 1.5 T [ z = 1470.0 cm ] ➡ Hg JET RADIUS / ANGLE: 0.4 cm / 0.09667 deg. ➡ PROTON BEAM POWER: 4 MW ➡ PROTON ENERGY: E = 8 GeV ➡ PROTON BEAM PROFILE : GAUSSIAN, σx = σy = 0.12 cm [ P12 OBTAINED USING DING'S STUDY II OPTIMIZED DATA] ➡ EVENTS IN SIMULATIONS : Np = 5,000,000 [ AVERAGE FROM 4 x 5E4 EVENTS ] 2 IDS120j GEOMETRY, NO RESISTIVE MAGNETS: WITH 20 cm GAPS BETWEEN CRYOSTATS *********************************************************** # MODIFIED Hg MODULE SIMULATES VAN GRAVE'S DESIGN. AZIMUTHAL POWER DISTRIBUTION IN SC#7, SC#9 IN CRYOSTAT#3. COMPARISON WITH FLUKA STUDIES. *********************************************************** ➡SIMULATIONS CODE: mars15 (2010) [ USING MCNP CROSS SECTION LIBRARIES ] ➡NEUTRON ENERGY CUTOFF:10-12 GeV ➡SHIELDING: 60% W + 40% He( WITH STST VESSELS) >PROTON BEAM POWER: 4 MW >PROTON ENERGY: E = 8 GeV >PROTON BEAM PROFILE: GAUSSIAN, σx = σy = 0.12 cm ( P12 ) >EVENTS IN SIMULATIONS : Np = 5,000,000 ( AVERAGE FROM 4 x 5E4 EVENTS ) IDS120j GEOMETRY, NO RESISTIVE MAGNETS: WITH 20 cm GAPS BETWEEN CRYOSTATS *********************************************************** # MODIFIED Hg MODULE SIMULATES VAN GRAVE'S DESIGN. AZIMUTHAL POWER DISTRIBUTION IN SC#7, SC#9 IN CRYOSTAT#3. COMPARISON WITH FLUKA STUDIES. *********************************************************** ➡SIMULATIONS CODE: mars15 (2010) [ USING MCNP CROSS SECTION LIBRARIES ] ➡NEUTRON ENERGY CUTOFF:10-12 GeV ➡SHIELDING: 60% W + 40% He( WITH STST VESSELS) PROTON BEAM POWER: 4 MW >PROTON ENERGY: E = 8 GeV >PROTON BEAM PROFILE: GAUSSIAN, σx = σy = 0.12 cm ( P12 ) >EVENTS IN SIMULATIONS : Np = 5,000,000 ( AVERAGE FROM 4 x 5E4 EVENTS ) IDS120j GEOMETRY, NO RESISTIVE MAGNETS: WITH 20 cm GAPS BETWEEN CRYOSTATS *********************************************************** # MODIFIED Hg MODULE SIMULATES VAN GRAVE'S DESIGN. AZIMUTHAL POWER DISTRIBUTION IN SC#7, SC#9 IN CRYOSTAT#3. COMPARISON WITH FLUKA STUDIES. *********************************************************** ➡SIMULATIONS CODE: mars15 (2010) [ USING MCNP CROSS SECTION LIBRARIES ] ➡NEUTRON ENERGY CUTOFF:10-12 GeV ➡SHIELDING: 60% W + 40% He( WITH STST VESSELS) ➡ Bz ( r = 0, z ) : 15 T [ z = -37.5 cm ] ➡ PROTON BEAM POWER: 4 MW ➡ PROTON ENERGY: E = 8 GeV ➡ PROTON BEAM PROFILE: GAUSSIAN, σx = σy = 0.12 cm ( P12 ) ➡ EVENTS IN SIMULATIONS : Np = 5,000,000 ( AVERAGE FROM 4 x 5E4 EVENTS ) IDS120j GEOMETRY, NO RESISTIVE COILS: WITH 20 cm GAPS *********************************************************** # SIMULATIONS USING LOWEST GRADE W BEADS IN SHIELDING ( OF 15.8 g/cc ) # BP#2 SEGMENTATION STUDIES WITHIN THE FIRST CRYOSTAT AND RIGHT FLANGE OF Hg POOL INNER VESSEL. *********************************************************** >SIMULATIONS CODE:mars1512 ( USING MCNP CROSS SECTION LIBRARIES ) >NEUTRON ENERGY CUTOFF:10-11 MeV >SHIELDING: 60% W + 40% He( WITH STST VESSELS) >PROTON BEAM POWER: 4 MW >PROTON ENERGY: E = 8 GeV >PROTON BEAM PROFILE: GAUSSIAN, σx = σy = 0.12 cm

  3. IDS120j: yz CROSS SECTIONS WITH DETAILS OF Hg POOL MODULE FROM VAN GRAVE'S PRESENTATION ( 8 / 9 / 2012 ). He FOR COOLING VACUUM THE DESIGN REQUIRES A 2.5 cm ! GAP BETWEEN SH#1 INNER VESSEL AND Hg POOL MODULE OUTER VESSEL. AN EVEN LARGER SPACE APPEARS TO BE BETWEEN INNER AND OUTER VESSEL OF THE Hg POOL MODULE FOR THE FLOW OF He GAS FOR COOLING THE POOL WALLS. THE RADIUS OF THE UPPER HALF ( ~ SEMICIRCULAR ) SECTION OF INNER Hg POOL VESSEL WILL BE 26.5 cm, MUCH LARGER THAN THE BEAM PIPE APERTURE AT THE END OF CRYO#1 ( ~ 17.7 cm ). 3

  4. IDS120j:yx CROSS SECTION WITH DETAILS OF Hg POOL MODULE FROM VAN's PLOTS ( LEFT ) AND ADAPTED DESIGN FOR MARS SIMULATIONS ( RIGHT ) [ AT z = 100 m ]. IDS120j: yx CROSS SECTION WITH DETAILS OF Hg POOL MODULE FROM VAN's PLOTS ( LEFT ) AND ADDAPTED DESIGN FOR MARS SIMULATIONS ( AT z = 100 cm ). φ = 0O 2.5 cm VACUUM GAP BETWEEN SHVS#1 INNER AND Hg MODULE OUTER TUBE φ = 90O y SH#1 HU = 15 cm VACUUM φ = 30O φ = 0O HgPL = - 15 cm HL = - 26 cm Hg 1.0 cm STST INNER / OUTER Hg MODULE TUBE SHVS#1: 2.0 cm STST INNER TUBE x 2.0 cm He GAP BETWEEN INNER AND OUTER MODULE TUBES FOR COOLING. EVERYTHING HAS BEEN PARAMETRIZED FOR FUTURE CONVINIENCE. THE HEIGHTS OF THE END POINTS OF THE STRAIGHT SECTIONS ARE HL = - 26 cm AND HU = 15 cm. THE FREE Hg POOL SURFACE IS AT y = - 15 cm. THE RADIUS OF THE LOWER HALF OF THE INNER VESSEL OF THE Hg MODULE IS NOW SMALLER THAN BEFORE : FROM ~ 45 cm ----> ~ 39 cm. THE REST OF THE SPACE BETWEEN SHVS#1 INNER AND OUTER TUBE ( AT R ~ 115 cm ) IS FILLED WITH SHIELDING. 4 7 φ = 90O φ = 0O y EVERYTHING HAS BEEN PARAMETRIZED FOR FUTURE CONVINIENCE. THE HEIGHTS OF THE END POINTS OF THE STRAIGHT SECTIONS ARE HL = - 26 cm AND HU = 15 cm. THE FREE Hg POOL SURFACE IS AT y = - 15 cm. THE RADIUS OF THE LOWER HALF OF THE INNER VESSEL OF THE Hg MODULE IS NOW SMALLER THAN BEFORE : FROM ~ 45 cm ----> ~ 42 cm. THE REST OF THE SPACE BETWEEN SHVS#1 INNER AND OUTER TUBE IS FILLED WITH SHIELDING. IDS120j: yx CROSS SECTION WITH DETAILS OF Hg POOL MODULE FROM VAN PLOTS ( LEFT ) AND ADDAPTED DESIGN FOR MARS SIMULATIONS ( AT z = 100 cm ). SHVS#1 2.0 cm STST OUTER TUBE SHVS#4 2.0 cm STST INNER TUBE 0.5 cm GAP BETWEEN INNER SHVS#4 AND SHVS#1 OUTER TUBE 1.0 cm He GAPS BETWEEN VESSELS AND SHIELDING

  5. IDS120j: yz ( LEFT ) AND yx AT z = 10 cm ( RIGHT ) CROSS SECTION WITH DETAILS OF THE NEW Hg MODULE AND THE LOWER HALF OF THE UPSTREAM REGION. φ = 90O y y z = - 100 cm z = 372.9 cm RU1 φ = 0O 5.0 cm STST RL1 z x 10 cm THICK STST FOR THE UPSTREAM AND DOWNSTREAM FLANGE OF Hg MODULE THE RADIUS OF THE TOP SEMICIRCULAR SECTION OF THE Hg INNER TUBE IS SUCH THAT WILL NOT INTERFERE WITH THE Hg JET AND THE BEAM PROTONS AT THE BEGINNING OF CRYO#1 ( z ~ - 240 cm ) [ RU1 = 28.0 cm AND RL1 = 45.0 cm ] #> ACCORDING TO VAN'S DESIGN THE VOLUME FROM THE BEGINNING OF CRYO#1 ( z ~ - 240 cm ) TO THE BEGINNING OF THE Hg POOL ( z ~ - 100 cm ) AND FROM y ~ -15 cm TO THE BOTTOM OF THE Hg MODULE INNER VESSEL ( R ~ 39 cm ) WILL BE EMPTY TO ACCOMODATE THE He PIPES AND OTHER COMPONENTS OF THE Hg POOL MODULE. #> SOME IMPROVEMENT IN SHIELDING IS ACHIEVED BY UNIFYING SH#1 AND SH#4. THERE WILL BE SIGNIFICANT INCREASE IN THE SHIELDING MASS ( > 200 tons ) TO BE CONTAINED IN THE NEW VESSEL (SHVS#1) ==> GREATER ASSYMETRY IN THE WEIGHT DISTRIBUTION. He COOLING OF SUCH A LARGE VOLUME ( > 22 m3 )OF SHIELDING CAN BE CHALLENGING. 5 # ACCORDING TO VAN'S DESIGN THE VOLUME FROM THE BEGINNING OF CRYO#1 ( z ~ - 240 cm )TO THE BEGINNING OF THE Hg POOL ( z ~ - 100 cm ) AND FROM y ~ -15 cm TO THE BOTTOM OF THE Hg MODULE INNER VESSEL ( R ~ 39 cm ) WILL BE EMPTY TO ACCOMODATE THE PIPES AND OTHER COMPONENTS OF THE Hg POOL MODULE. # SOME IMPROVEMENT IN SHIELDING IS ACHIEVED BY UNIFYING SH#1 AND SH#4. THERE WILL BE SIGNIFICANT INCREASE IN THE SHIELDING MASS ( > 200 tons ) TO BE CONTAINED IN THE NEW VESSEL (SHVS#1) ==> GREATER ASSYMETRY IN THE WEIGHT DISTRIBUTION. He COOLING OF SUCH A LARGE VOLUME ( > 22 m3 )OF SHIELDING CAN BE CHALENGING. 5 IDS120j: yz ( LEFT ) AND yx AT z = 10 cm ( RIGHT ) CROSS SECTION WITH DETAILS OF THE NEW Hg MODULE AND THE LOWER HALF OF THE UPSTREAM REGION.

  6. IDS120j: yz AT x = 0.0 cm [ LEFT ] AND yx AT z = 1040.0 cm [ RIGHT ] CROSS SECTION WITH DETAILS OF SC#7 SEGMENTATION. IN LEFT PLOT ONE CAN ALSO SEE DETAILS OF THE 20.0 cm GAP BETWEEN CRYOSTAT#2 AND CRYOSTAT#3. . φ = 90O y y φ = 0O z x --- SEGMENTATION DATA --- 70.0 < r < 89.97 cm dr = 9.985 cm Nr = 2 bins 1036.0 < z < 1046.67 cm dz = 5.335 cm Nz = 2 bins 0.0 < φ < 360.0 deg. dφ = 30 deg. Nφ= 12 bins Ntot = 48 ''pieces'' IDS120j: yz ( LEFT ) AND yx ( RIGHT ) CROSS SECTION WITH DETAILS OF THE BP#1 SEGMENTATION. X CROSS SECTION WITH DETAILS OF THE BP#2 SEGMENTATION. 6 18 6 120.0 < r < 150.0 cm dr = 10.0 cm Nr = 3 bins - 55.0 < z < 185.0 cm dz = 20.0 cm Nz = 12 bins 0.0 < φ < 360.0 deg. dφ = 30 deg. Nφ= 12 bins Ntot = 432 ''pieces'' ONLY THE AREA WITH HIGHEST AVERAGE AZIMUTHAL DPD ( DETERMINED FROM MARS PLOTS ) WAS STUDIED. IDS120j: yz ( LEFT ) AND yx ( RIGHT ) CROSS SECTION WITH DETAILS OF THE SC#1+2 SEGMENTATION. 70.0 < r < 89.97 cm dr = 9.985 cm Nr = 2 bins 1036.0 < z < 1046.67 cm dz = 5.335 cm Nz = 2 bins 0.0 < φ < 360.0 deg. dφ = 30 deg. Nφ= 12 bins Ntot = 48 ''pieces''

  7. Mars1510 (DESKTP) 5 E05 PEAK TDPD ~ 0.040 mW / g AT ABOUT 200 deg ( BOTTOM OF THE COIL NEAR -x AXIS ) . THIS IS FOR z1 AND FOR BOTH r1, r2 RADIUS. THESE AREAS FACE UPSTREAM TOWARDS THE TARGET REGION. THE REASON FOR THE RELATIVE INCREASE IN THE TDP IN THE LOWER HALF OF THE COIL AND FOR THE UPSTREAM SIDE IS THE INCREASE OF THE Hg POOL LENGTH ALL THE WAY TO THE END OF THE FIRST CRYOSTAT AT THE EXPANCE OF W SHIELDING THERE. SC#7 : 48 “PIECES” TDP = 0.0086 kW VS. ONE VOLUME COIL TDP = 0.0078 kW FLUKA SC#7 TDP = 0.008 ± 0.007 kW SC#7 PEAK TDPD = 0.03 mW/g RADIAL / 0.15 mW/g AZIMUTHAL ( ± ??? ) ( FROM JOHN BACK / JUNE 10 2012 ) . 7 PEAK TDPD mars1510 < 0.06 mW / g IN SC#1 mars1512 < 0.19 mW / g IN SC#2. BOTH CODES SHOW MOST OF THE DP TO BE BETWEEN ~ - 40 < z < 40 cm AND IN THE LOWER HALF OF SC#1+2, TOWARDS THE + x DIRECTION. NEW MARS CODE GIVES TDPD ~ 0.1 mW / g IN THE SAME REGION mars1510 GIVES PEAK TDPD. BUT THE PEAK TDPD ACCORDING TO mars1512 IS FURTHER DOWNSTREAM. 7 PEAK TDPD < 0.06 mW / g. MOST OF THE DP IS BETWEEN -20 < z < 40 cm, AND THE LOWER HALF OF SC#1+2, TOWARDS THE + x DIRECTION . THIS IS THE RESULT OF REMOVING SHIELDING IN THE LOWER PART OF THE Hg MODULE AND REPLACING IT WITH LIQUID Hg. THE NEGATIVE IMPACT OF THE NEW Hg MODULE IN SH#1 IS GREATELY MITIGATED BY THE INTRODUCTION OF ~ 8 cm THICK CYLIDRICAL SHIELDING VOLUME AT R ~ 50 cm WHEN SH#1 AND SH#4 ARE UNIFIED INTO ONE VOLUME.

  8. IDS120j: yz AT x = 0.0 cm [ LEFT ] AND yx AT z = 1090.0 cm [ RIGHT ] CROSS SECTION WITH DETAILS OF SC#8 SEGMENTATION. DUE TO THE COIL RADIAL THIKNESS UNAVOIDABLY THE RADIAL BIN SIZE IN THE SEGMENTATION IS SMALL. . φ = 90O φ = 90O y y y φ = 0O z z x --- SEGMENTATION DATA --- 70.0 < r < 72.54 cm dr = 2.54 cm Nr = 1 bins 1081.70 < z < 1421.20 cm dz = 19.971 cm Nz = 17 bins 0.0 < φ < 360.0 deg. dφ = 30 deg. Nφ= 12 bins Ntot = 204 ''pieces'' IDS120j: yz ( LEFT ) AND yx ( RIGHT ) CROSS SECTION WITH DETAILS OF THE SC#1+2 SEGMENTATION. 8 18 X CROSS SECTION WITH DETAILS OF THE BP#2 SEGMENTATION. 6 --- SEGMENTATION DATA --- 70.0 < r < 89.97 cm dr = 9.985 cm Nr = 2 bins 1036.0 < z < 1046.67 cm dz = 5.335 cm Nz = 2 bins 0.0 < φ < 360.0 deg. dφ = 30 deg. Nφ= 12 bins Ntot = 48 ''pieces'' 6 IDS120j: yz ( LEFT ) AND yx ( RIGHT ) CROSS SECTION WITH DETAILS OF THE BP#1 SEGMENTATION. IDS120j: yz AT x = 0.0 cm [ LEFT ] AND yx AT z = 1040.0 cm [ RIGHT ] CROSS SECTION WITH DETAILS OF SC#7 SEGMENTATION. IN LEFT PLOT ONE CAN ALSO SEE DETAILS OF THE 20.0 cm GAP BETWEEN CRYOSTAT#2 AND CRYOSTAT#3. .

  9. PEAK TDPD ~ 0.015 mW / g AT ABOUT 220, 285 deg AROUND THE -y AXIS AND AT z ~ 1225 cm . THERE IS LOT OF STATISTICAL FLUCTUATIONS DUE TO THE SMALL RADIAL BIN SIZE. SC#8 : SEGMENTATION TDP = 0.0102 kW VS. ONE VOLUME COIL TDP = 0.0106 kW FLUKA SC#8 TDP = 0.014 ± 0.006 kW SC#8 PEAK TDPD = 0.02 mW/g RADIAL / 0.02 mW/g AZIMUTHAL ( ± ??? ) ( JOHN BACK / JUNE 10 2012 ) . 9 7 Mars1510 (DESKTP) 5 E05 PEAK TDPD ~ 0.018 mW / g AT ABOUT 90 deg ( + y AXIS ) AT r2, z1 AND LITTLE AFTER THAT WE HAVE A SECOND PEAK ~ 0.0013 mW/g AT r1,z1. BOTH PEAKS ARE FOR “PIECES” FACING THE TARGET BUT AS ONE MAY EXPECT WE HAVE MORE STATISTICAL UNCERTAINTY. SINCE THE TWO PEAK VALUES ARE NOT MUCH DIFFERENT THOUGH ONE SHOULD NOT EXPECT A BIG CHANGE IN THE RESULT IF HIGHER STATISTICS IS USED. IT IS ALSO IMPORTANT TO NOTICE THAT TDP ~ 4.6 Watts AND IT WILL BE RATHER UNUSUAL A LOT OF THIS ENERGY TO BE FOCUSED IN A SMALL AREA IN A BIG COIL LIKE SC#9 LOCATED ~ 15 m DOWNSTREAM THE TARGET. SC#9: SEGMENTATION TDP = 0.0046 kW VS. ONE VOLUME COIL TDP = 0.0042 kW FLUKA SC#9 TDP = 0.005 ± 0.004 kW SC#7 PEAK TDPD = 0.03 mW/g RADIAL / 0.10 mW/g AZIMUTHAL ( ± ??? ) ( FROM JOHN BACK / JUNE 10 2012 ) . 7 PEAK TDPD < 0.06 mW / g. MOST OF THE DP IS BETWEEN -20 < z < 40 cm, AND THE LOWER HALF OF SC#1+2, TOWARDS THE + x DIRECTION . THIS IS THE RESULT OF REMOVING SHIELDING IN THE LOWER PART OF THE Hg MODULE AND REPLACING IT WITH LIQUID Hg. THE NEGATIVE IMPACT OF THE NEW Hg MODULE IN SH#1 IS GREATELY MITIGATED BY THE INTRODUCTION OF ~ 8 cm THICK CYLIDRICAL SHIELDING VOLUME AT R ~ 50 cm WHEN SH#1 AND SH#4 ARE UNIFIED INTO ONE VOLUME.

  10. IDS120j: yz AT x = 0.0 cm [ LEFT ] AND yx AT z = 1455.0 cm [ RIGHT ] CROSS SECTION WITH DETAILS OF SC#9 SEGMENTATION. COILS SC#7 AND SC#9 HAVE ABOUT THE SAME DIMENSIONS. IN LEFT PLOT ONE CAN ALSO SEE DETAILS OF THE 20.0 cm GAP BETWEEN CRYOSTAT#3 AND CRYOSTAT#4. . φ = 90O y y φ = 0O z x --- SEGMENTATION DATA --- 70.0 < r < 89.97 cm dr = 9.985 cm Nr = 2 bins 1453.0 < z < 1464.04 cm dz = 5.335 cm Nz = 2 bins 0.0 < φ < 360.0 deg. dφ = 30 deg. Nφ= 12 bins Ntot = 48 ''pieces'' IDS120j: yz ( LEFT ) AND yx ( RIGHT ) CROSS SECTION WITH DETAILS OF THE SC#1+2 SEGMENTATION. 10 18 9 X CROSS SECTION WITH DETAILS OF THE BP#2 SEGMENTATION. 6 --- SEGMENTATION DATA --- 70.0 < r < 89.97 cm dr = 9.985 cm Nr = 2 bins 1036.0 < z < 1046.67 cm dz = 5.335 cm Nz = 2 bins 0.0 < φ < 360.0 deg. dφ = 30 deg. Nφ= 12 bins Ntot = 48 ''pieces'' 6 IDS120j: yz ( LEFT ) AND yx ( RIGHT ) CROSS SECTION WITH DETAILS OF THE BP#1 SEGMENTATION. IDS120j: yz AT x = 0.0 cm [ LEFT ] AND yx AT z = 1040.0 cm [ RIGHT ] CROSS SECTION WITH DETAILS OF SC#7 SEGMENTATION. IN LEFT PLOT ONE CAN ALSO SEE DETAILS OF THE 20.0 cm GAP BETWEEN DIPOLE#2 AND DIPOLE#3. .

  11. PEAK TDPD ~ 0.018 mW / g AT ABOUT 90 deg ( + y AXIS ) AT r2, z1 AND LITTLE AFTER THAT WE HAVE A SECOND PEAK ~ 0.0013 mW/g AT r1,z1. BOTH PEAKS ARE FOR “PIECES” FACING THE TARGET BUT AS ONE MAY EXPECT WE HAVE MORE STATISTICAL UNCERTAINTY THAN IN SC#7 . SINCE THE TWO PEAK VALUES ARE NOT MUCH DIFFERENT ONE SHOULD NOT EXPECT A BIG CHANGE IN THE RESULT IF HIGHER STATISTICS IS USED. IT IS ALSO IMPORTANT TO NOTICE THAT TDP ~ 4.6 Watts AND IT WILL BE RATHER UNUSUAL A LOT OF THIS ENERGY TO BE FOCUSED IN A SMALL AREA IN A BIG COIL LIKE SC#9 LOCATED ~ 15 m DOWNSTREAM THE TARGET. SC#9: SEGMENTATION TDP = 0.0046 kW VS. ONE VOLUME COIL TDP = 0.0042 kW FLUKA SC#9 TDP = 0.005 ± 0.004 kW SC#7 PEAK TDPD = 0.03 mW/g RADIAL / 0.10 mW/g AZIMUTHAL ( ± ??? ) ( FROM JOHN BACK / JUNE 10 2012 ) . PEAK TDPD < 0.06 mW / g. MOST OF THE DP IS BETWEEN -20 < z < 40 cm, AND THE LOWER HALF OF SC#1+2, TOWARDS THE + x DIRECTION . THIS IS THE RESULT OF REMOVING SHIELDING IN THE LOWER PART OF THE Hg MODULE AND REPLACING IT WITH LIQUID Hg. THE NEGATIVE IMPACT OF THE NEW Hg MODULE IN SH#1 IS GREATELY MITIGATED BY THE INTRODUCTION OF ~ 8 cm THICK CYLIDRICAL SHIELDING VOLUME AT R ~ 50 cm WHEN SH#1 AND SH#4 ARE UNIFIED INTO ONE VOLUME. 12 7 7 PEAK TDPD < 0.040 mW / g AT ABOUT 200 deg AT THE BOTTOM OF THE COIL (NEAR -x AXIS ) . THIS IS FOR z1 AND FOR BOTH r1, r2. THESE AREAS FACE UPSTREAM TOWARDS THE TARGET REGION. THE REASON FOR THE RELATIVE INCREASE IN THE TDP IN THE LOWER HALF OF THE COIL AND FOR THE UPSTREAM SIDE IS THE INCREASE OF THE Hg POOL LENGTH ALL THE WAY TO THE END OF THE FIRST CRYOSTAT AT THE EXPANCE OF W SHIELDING THERE. SC#7 : SEGMENTATION TDP = 0.0086 kW VS. ONE VOLUME COIL TDP = 0.0078 kW FLUKA SC#7 TDP = 0.008 ± 0.007 kW SC#7 PEAK TDPD = 0.03 mW/g RADIAL / 0.15 mW/g AZIMUTHAL ( ± ??? ) ( JOHN BACK / JUNE 10 2012 ) . Mars1510 (DESKTP) 5 E05

  12. **** COMMENTS ON MARS AND FLUKA PEAK TDPD [ USING SC#7 CASE FOR EXAMPLE ] **** # SC#7 : VOLUME = 1.07 10^5 cc, Dens (NbTi ) =7.0 g/cc ==> Mass ~ 7.49 10^5 gr. # MARS: PEAK TDPD FROM SEGMENTATION ~ 0.04 mW / g. # FLUKA: PEAK TDPD AVERAGE(?) RADIAL ~ 0.03 mW / g AVERAGE(?) AZIMUTHAL ~ 0.15 mW / g -->??. # MARS: TDP ~ 7.8 Watts ( NO SEGMENT. ) ==> AVERAGE TDPD ( SC#7 VOLUME ) ~ 0.0104 mW/ g . FROM 48 SEGMENTATION “PIECES” ==> AVERAGE TDPD ~ 0.0139 mW/ g. THESE TWO NUMBER ARE IN GOOD AGREEMENT. # FLUKA: TDP ~ 8.0±7.0 Watts ==> AVERAGE TDPD FOR ALL VOLUME ~ FROM 0.0013 TO 0.02 mW/ g . IF WE CONSIDER THE MAXIMUM AVERAGE DENSITY OF 0.02 mW/g THERE IS STILL A HUGE GAP WITH THE AZIMUTHAL PEAK TDPD 0.15 mW/g ( EVEN WORSE IF THIS IS THE AVERAGE AZIMUTHAL TDPD ) # THERE IS SOMETHING STRANGE WITH FLUKA RESULTS ... >> ALSO P12 USED FOR SO FAR STUDIES IS EXTRACTED BY USING STUDY II OPTIMIZED P12 POINT BY BACTRACKING PROTONS ( OR TRAKING ANTIPROTONS ) FROM STUDY II P12 COORDINATES AT z = -37.5 cm. DING HAS NEVER WORKED OUT A SET OF OPTIMIZED POINTS FOR THE LATEST IDS120j. 13

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