Difference: ClicRedesignSim (1 vs. 18)

Revision 1829 Jan 2014 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 19 to 19
 
  • The only factor that significantly affects the Q above is the waveguide width. Reducing the waveguide width will reduce the Q.
  • However the results above show that a copper cavity rather than stainless steel yields an acceptable Q value. The measured loaded of Q of 517 corresponds to 1.0% signal level at 50 ns. The measured loaded Q for stainless steel was 268.
Changed:
<
<

ACE3P Simulation

>
>

ACE3P Simulation

 
  • Attempts at measuring the loaded Q of the full geometry (cavity, waveguides and coaxial) in CST were unsatisfactory. However ACE3P was later used succesfully, yielding a Q factor of 579 at a resonant dipole frequency of 14.988 GHz
  • This corresponds to a time decay of 6.1 ns, after 50 ns the signal will decay to 1.7%.

Revision 1723 Jul 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 25 to 25
 
  • This corresponds to a time decay of 6.1 ns, after 50 ns the signal will decay to 1.7%.
  • The external Q is 702 and the loaded Q with stainless steel is 292.
Added:
>
>

Cavity Simulation With New Feedthrough Design

  • ACE3P was also used to simulate the BPM with the beaded antenna designed here: ClicFTSim. The geometry is shown below.

bead.jpg

  • A loaded Q factor of 670 was found at a resonant frequency of 14.991 GHz. This corresponds to a signal level of 3.0% after 50 ns.
  • The external Q was found to be 702.
 

Revision 1623 Jul 2013 - JackTowler

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META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 36 to 36
 

Added:
>
>
  • bead.jpg:
    bead.jpg
 
META FILEATTACHMENT attachment="coax.PNG" attr="h" comment="" date="1367325746" name="coax.PNG" path="coax.PNG" size="98300" user="ztap061" version="1"
META FILEATTACHMENT attachment="wg.PNG" attr="h" comment="" date="1367325746" name="wg.PNG" path="wg.PNG" size="40956" user="ztap061" version="1"
META FILEATTACHMENT attachment="qfac1.png" attr="h" comment="" date="1367326287" name="qfac1.png" path="qfac1.png" size="283248" user="ztap061" version="1"
Line: 53 to 56
 
META FILEATTACHMENT attachment="length.png" attr="h" comment="" date="1371802356" name="length.png" path="length.png" size="52265" user="ztap061" version="1"
META FILEATTACHMENT attachment="wgodd.png" attr="h" comment="" date="1371802356" name="wgodd.png" path="wgodd.png" size="38907" user="ztap061" version="1"
META FILEATTACHMENT attachment="wggeom.png" attr="h" comment="" date="1371828581" name="wggeom.png" path="wggeom.png" size="29295" user="ztap061" version="1"
Added:
>
>
META FILEATTACHMENT attachment="bead.jpg" attr="h" comment="" date="1374587556" name="bead.jpg" path="bead.jpg" size="29351" user="ztap061" version="1"

Revision 1523 Jul 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Revision 1423 Jul 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 17 to 17
 

  • The only factor that significantly affects the Q above is the waveguide width. Reducing the waveguide width will reduce the Q.
Changed:
<
<
  • However the results above show that a copper cavity rather than stainless steel yields an acceptable Q value. The measured loaded of Q of 517 corresponds to 1% signal levl at 50 ns. The measured loaded Q for stainless steel was 268.

Feedthrough Geometry

  • To reduce the sensitivity of the feedthrough to waveguide-antenna separation simulations were performed using the following geometry.

wggeom.png

>
>
  • However the results above show that a copper cavity rather than stainless steel yields an acceptable Q value. The measured loaded of Q of 517 corresponds to 1.0% signal level at 50 ns. The measured loaded Q for stainless steel was 268.
 
Added:
>
>

ACE3P Simulation

 
Added:
>
>
  • Attempts at measuring the loaded Q of the full geometry (cavity, waveguides and coaxial) in CST were unsatisfactory. However ACE3P was later used succesfully, yielding a Q factor of 579 at a resonant dipole frequency of 14.988 GHz
  • This corresponds to a time decay of 6.1 ns, after 50 ns the signal will decay to 1.7%.
  • The external Q is 702 and the loaded Q with stainless steel is 292.
 

-- JackTowler - 30 Apr 2013

Revision 1321 Jun 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 19 to 19
 
  • The only factor that significantly affects the Q above is the waveguide width. Reducing the waveguide width will reduce the Q.
  • However the results above show that a copper cavity rather than stainless steel yields an acceptable Q value. The measured loaded of Q of 517 corresponds to 1% signal levl at 50 ns. The measured loaded Q for stainless steel was 268.
Added:
>
>

Feedthrough Geometry

  • To reduce the sensitivity of the feedthrough to waveguide-antenna separation simulations were performed using the following geometry.

wggeom.png

 

Revision 1221 Jun 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 29 to 29
 -- JackTowler - 30 Apr 2013

Deleted:
<
<

  • length.png:

  • wgodd.png:

 
META FILEATTACHMENT attachment="coax.PNG" attr="h" comment="" date="1367325746" name="coax.PNG" path="coax.PNG" size="98300" user="ztap061" version="1"
META FILEATTACHMENT attachment="wg.PNG" attr="h" comment="" date="1367325746" name="wg.PNG" path="wg.PNG" size="40956" user="ztap061" version="1"
META FILEATTACHMENT attachment="qfac1.png" attr="h" comment="" date="1367326287" name="qfac1.png" path="qfac1.png" size="283248" user="ztap061" version="1"

Revision 1121 Jun 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 9 to 9
  wg.PNG
Changed:
<
<
  • In CST the width of the waveguides and the offset of the waveguides from the beam pipe were altered and it's effect on the Q factor for the first monopole, dipole and quadrupole mode was monitored.
  • The resonant frequencies of these modes were also monitored.
qfac6.png

  • Several anomalous points occur where the simulation measured the Q at the wrong mode, despite this, the general pattern is still visible.
  • For the dipole mode the Q factor changes little with the offset of the waveguide, generally it increases with increasing offset.
  • The response to waveguide width is slightly greater, the thinner waveguides generally give a larger Q factor.

qfac1.png

qfac8.png

  • The same is generally true for the monopole mode as well, smaller offset and thinner waveguide increase Q. For the quadrupole, the Q increases with with offset and width.
  • The change in Q factor is not significant enough to warrant further investigation.
  • R/Q's were also recorded (at 1mm offset) and did not deviate significantly from around 0.82 Ohms, which is in agreement with previous simulation.

Position Cavity Length

  • The cavity length was also altered to see it's affect on the Q value.

Qfact.png

  • Here the change in Q factor is greater. Decreasing the length decreases the Q of both the monopole and dipole modes.
>
>
  • The loaded Q was recorded while changing the geometry of the design. This included the offset of the waveguides from the beampipe, the width of the waveguides and the length of the resonating cavity. The geometry was simulated in Copper.
 
Changed:
<
<
RQ.png
>
>
length.png wgodd.png
 
Changed:
<
<
  • It also has an effect on the normalised shunt impedances of the modes. Which also decrease with cavity length.

Cavity Radius

QDip.png
FDip.png

  • The Q factor decreases slightly with increasing cavity radius, but nothing significant. Frequency also decreases as expected with radius.

Material Conductivity

cond.png
>
>
  • The only factor that significantly affects the Q above is the waveguide width. Reducing the waveguide width will reduce the Q.
  • However the results above show that a copper cavity rather than stainless steel yields an acceptable Q value. The measured loaded of Q of 517 corresponds to 1% signal levl at 50 ns. The measured loaded Q for stainless steel was 268.
 

Revision 1016 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 74 to 74
 -- JackTowler - 30 Apr 2013

Added:
>
>

  • rl.png:
    rl.png
 
META FILEATTACHMENT attachment="coax.PNG" attr="h" comment="" date="1367325746" name="coax.PNG" path="coax.PNG" size="98300" user="ztap061" version="1"
META FILEATTACHMENT attachment="wg.PNG" attr="h" comment="" date="1367325746" name="wg.PNG" path="wg.PNG" size="40956" user="ztap061" version="1"
META FILEATTACHMENT attachment="qfac1.png" attr="h" comment="" date="1367326287" name="qfac1.png" path="qfac1.png" size="283248" user="ztap061" version="1"
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META FILEATTACHMENT attachment="FDip.png" attr="h" comment="" date="1368604822" name="FDip.png" path="FDip.png" size="74580" user="ztap061" version="1"
META FILEATTACHMENT attachment="RDip.png" attr="h" comment="" date="1368604822" name="RDip.png" path="RDip.png" size="69710" user="ztap061" version="1"
META FILEATTACHMENT attachment="QDip.png" attr="h" comment="" date="1368604822" name="QDip.png" path="QDip.png" size="80776" user="ztap061" version="1"
Added:
>
>
META FILEATTACHMENT attachment="DipQ.png" attr="h" comment="" date="1368714256" name="DipQ.png" path="DipQ.png" size="77225" user="ztap061" version="1"
META FILEATTACHMENT attachment="rl.png" attr="h" comment="" date="1368714256" name="rl.png" path="rl.png" size="78593" user="ztap061" version="1"

Revision 916 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 45 to 45
 
  • It also has an effect on the normalised shunt impedances of the modes. Which also decrease with cavity length.
Added:
>
>

Cavity Radius

QDip.png
FDip.png

  • The Q factor decreases slightly with increasing cavity radius, but nothing significant. Frequency also decreases as expected with radius.

 

Material Conductivity

Line: 61 to 74
 -- JackTowler - 30 Apr 2013

Deleted:
<
<
  • FDip.png:
    FDip.png

  • RDip.png:
    RDip.png

  • QDip.png:
    QDip.png
 
META FILEATTACHMENT attachment="coax.PNG" attr="h" comment="" date="1367325746" name="coax.PNG" path="coax.PNG" size="98300" user="ztap061" version="1"
META FILEATTACHMENT attachment="wg.PNG" attr="h" comment="" date="1367325746" name="wg.PNG" path="wg.PNG" size="40956" user="ztap061" version="1"
META FILEATTACHMENT attachment="qfac1.png" attr="h" comment="" date="1367326287" name="qfac1.png" path="qfac1.png" size="283248" user="ztap061" version="1"

Revision 815 May 2013 - JackTowler

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META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 62 to 62
 

Added:
>
>
  • FDip.png:
    FDip.png

  • RDip.png:
    RDip.png

  • QDip.png:
    QDip.png
 
META FILEATTACHMENT attachment="coax.PNG" attr="h" comment="" date="1367325746" name="coax.PNG" path="coax.PNG" size="98300" user="ztap061" version="1"
META FILEATTACHMENT attachment="wg.PNG" attr="h" comment="" date="1367325746" name="wg.PNG" path="wg.PNG" size="40956" user="ztap061" version="1"
META FILEATTACHMENT attachment="qfac1.png" attr="h" comment="" date="1367326287" name="qfac1.png" path="qfac1.png" size="283248" user="ztap061" version="1"
Line: 71 to 80
 
META FILEATTACHMENT attachment="Qfact.png" attr="h" comment="" date="1367572876" name="Qfact.png" path="Qfact.png" size="89436" user="ztap061" version="1"
META FILEATTACHMENT attachment="RQ.png" attr="h" comment="" date="1367576722" name="RQ.png" path="RQ.png" size="70658" user="ztap061" version="1"
META FILEATTACHMENT attachment="cond.png" attr="h" comment="" date="1367598460" name="cond.png" path="cond.png" size="106862" user="ztap061" version="1"
Added:
>
>
META FILEATTACHMENT attachment="FDip.png" attr="h" comment="" date="1368604822" name="FDip.png" path="FDip.png" size="74580" user="ztap061" version="1"
META FILEATTACHMENT attachment="RDip.png" attr="h" comment="" date="1368604822" name="RDip.png" path="RDip.png" size="69710" user="ztap061" version="1"
META FILEATTACHMENT attachment="QDip.png" attr="h" comment="" date="1368604822" name="QDip.png" path="QDip.png" size="80776" user="ztap061" version="1"

Revision 714 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Revision 603 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 45 to 45
 
  • It also has an effect on the normalised shunt impedances of the modes. Which also decrease with cavity length.
Added:
>
>

Material Conductivity

cond.png
 

Revision 503 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 15 to 15
  qfac6.png
Added:
>
>
  • Several anomalous points occur where the simulation measured the Q at the wrong mode, despite this, the general pattern is still visible.
 
  • For the dipole mode the Q factor changes little with the offset of the waveguide, generally it increases with increasing offset.
  • The response to waveguide width is slightly greater, the thinner waveguides generally give a larger Q factor.
Line: 26 to 27
 
  • The same is generally true for the monopole mode as well, smaller offset and thinner waveguide increase Q. For the quadrupole, the Q increases with with offset and width.
  • The change in Q factor is not significant enough to warrant further investigation.
Changed:
<
<
  • R/Q's were also recorded and did deviate significantly from around 0.82 Ohms, which is in agreement with previous simulation.
>
>
  • R/Q's were also recorded (at 1mm offset) and did not deviate significantly from around 0.82 Ohms, which is in agreement with previous simulation.

Position Cavity Length

  • The cavity length was also altered to see it's affect on the Q value.

Qfact.png

  • Here the change in Q factor is greater. Decreasing the length decreases the Q of both the monopole and dipole modes.

RQ.png

  • It also has an effect on the normalised shunt impedances of the modes. Which also decrease with cavity length.
 

Revision 403 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"

Position Cavity Waveguide Geometry

Line: 40 to 40
 
Added:
>
>
  • Qfact.png:
    Qfact.png

  • dipoleRQ.png:
    dipoleRQ.png

 
META FILEATTACHMENT attachment="coax.PNG" attr="h" comment="" date="1367325746" name="coax.PNG" path="coax.PNG" size="98300" user="ztap061" version="1"
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META FILEATTACHMENT attachment="qfac1.png" attr="h" comment="" date="1367326287" name="qfac1.png" path="qfac1.png" size="283248" user="ztap061" version="1"
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META FILEATTACHMENT attachment="qfac8.png" attr="h" comment="" date="1367326287" name="qfac8.png" path="qfac8.png" size="156079" user="ztap061" version="1"
META FILEATTACHMENT attachment="freq6.png" attr="h" comment="" date="1367493049" name="freq6.png" path="freq6.png" size="233192" user="ztap061" version="1"
Added:
>
>
META FILEATTACHMENT attachment="Qfact.png" attr="h" comment="" date="1367572876" name="Qfact.png" path="Qfact.png" size="89436" user="ztap061" version="1"
META FILEATTACHMENT attachment="dipoleRQ.png" attr="h" comment="" date="1367572876" name="dipoleRQ.png" path="dipoleRQ.png" size="59035" user="ztap061" version="1"
META FILEATTACHMENT attachment="MonoR.png" attr="h" comment="" date="1367572876" name="MonoR.png" path="MonoR.png" size="56874" user="ztap061" version="1"

Revision 302 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"
Changed:
<
<

Changing Position Cavity Geometry

>
>

Position Cavity Waveguide Geometry

 
  • To improve simulation time, the coaxials were ignored and the waveguide end cut short with ports added at the end of the waveguide. Perfect Electrical Conductor (PEC) was used as the background material to further speed up the simulation
Line: 19 to 19
 
  • The response to waveguide width is slightly greater, the thinner waveguides generally give a larger Q factor.

Changed:
<
<
qfac1.png qfac8.png
>
>
qfac1.png

qfac8.png

 

  • The same is generally true for the monopole mode as well, smaller offset and thinner waveguide increase Q. For the quadrupole, the Q increases with with offset and width.
Changed:
<
<
  • The frequency
>
>
  • The change in Q factor is not significant enough to warrant further investigation.
  • R/Q's were also recorded and did deviate significantly from around 0.82 Ohms, which is in agreement with previous simulation.
 

Revision 202 May 2013 - JackTowler

Line: 1 to 1
 
META TOPICPARENT name="ClicBpm"
Changed:
<
<

Changing Cavity/Waveguide Geometry

>
>

Changing Position Cavity Geometry

 
  • To improve simulation time, the coaxials were ignored and the waveguide end cut short with ports added at the end of the waveguide. Perfect Electrical Conductor (PEC) was used as the background material to further speed up the simulation
Line: 19 to 19
 
  • The response to waveguide width is slightly greater, the thinner waveguides generally give a larger Q factor.

Changed:
<
<
qfac1.png
>
>
qfac1.png qfac8.png
 
Changed:
<
<

qfac8.png

>
>
  • The same is generally true for the monopole mode as well, smaller offset and thinner waveguide increase Q. For the quadrupole, the Q increases with with offset and width.
 
Added:
>
>
  • The frequency
 

Revision 130 Apr 2013 - JackTowler

Line: 1 to 1
Added:
>
>
META TOPICPARENT name="ClicBpm"

Changing Cavity/Waveguide Geometry

  • To improve simulation time, the coaxials were ignored and the waveguide end cut short with ports added at the end of the waveguide. Perfect Electrical Conductor (PEC) was used as the background material to further speed up the simulation

coax.PNG wg.PNG

  • In CST the width of the waveguides and the offset of the waveguides from the beam pipe were altered and it's effect on the Q factor for the first monopole, dipole and quadrupole mode was monitored.
  • The resonant frequencies of these modes were also monitored.
qfac6.png

  • For the dipole mode the Q factor changes little with the offset of the waveguide, generally it increases with increasing offset.
  • The response to waveguide width is slightly greater, the thinner waveguides generally give a larger Q factor.

qfac1.png

qfac8.png

<--

Settings just to customise this page

-->

-- JackTowler - 30 Apr 2013

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