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<td width="19%" valign=top>Traveler Title</TD>
<td width="80%" colspan=4 valign=top>C75 Cavities VTA RF Test</TD>
</tr>
<tr>
<td width="19%" valign=top>Traveler Abstract</TD>
<td width="80%" colspan=4 valign=top>Cryogenic RF testing of C75 5-cell CEBAF cavities.
Cavities can be tested single or as part of a hermetic pair.<BR/>
Cavity</TD>
</tr>
<tr>
<td width="19%" valign=top>Traveler ID</TD>
<td width="80%" colspan=4 valign=top>ER5C-VTA-CPR-VTRF</TD>
</tr>
<tr>
<td width="19%" valign=top>Traveler Revision </TD>
<td width="80%" colspan=4 valign=top>R6</TD>
</tr>
<tr>
<td width="19%" valign=top>Traveler Author</TD>
<td width="80%" colspan=4 valign=top>C. Wilson</TD>
</tr>
<tr>
<td width="19%" valign=top>Traveler Date</TD>
<td width="80%" colspan=4 valign=top>17-May-2023</TD>
</tr>
<tr>
<td width="19%" valign=top>NCR Informative Emails</TD>
<td width="80%" colspan=4 valign=top>areilly</TD>
</tr>
<tr>
<td width="19%" valign=top>NCR Dispositioners</TD>
<td width="80%" colspan=4 valign=top>kdavis,gciovati,grenoble</TD>
</tr>
<tr>
<td width="19%" valign=top>D3 Emails</TD>
<td width="80%" colspan=4 valign=top>kdavis,areilly,gciovati,grenoble</TD>
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<tr>
<td width="19%" valign=top>Approval Names</TD>
<td width="20%" valign=top>C. Wilson</TD>
<td width="20%" valign=top>G. Ciovati</TD>
<td width="20%" valign=top>T. Reilly</TD>
<td width="20%" valign=top>K. Davis</TD>
</tr>
<tr>
<td width="19%" valign=top>Approval Signatures</TD>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
</tr>
<tr>
<td width="19%" valign=top>Approval Dates</TD>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
</tr>
<tr>
<td width="19%" valign=top>Approval Title</TD>
<td width="20%" valign=top>Author</TD>
<td width="20%" valign=top>Reviewer</TD>
<td width="20%" valign=top>Project Manager</TD>
<td width="20%" valign=top>VTA facility manager</TD>
</tr>
</table>
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<tr>
<td width="19%" valign=top>References</TD>
<td width="80%" colspan=4 valign=top>List and Hyperlink all documents related to this traveler.
This includes, but is not limited to: safety (THAs, SOPs, etc), drawings,
procedures, and facility related documents.</TD>
</tr>
<tr>
<td width="19%" valign=top><a
href="https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-27461/A-09-001-SOP%20Operation%20of%20the%20Test%20Lab%20VTA%20Document-21542.pdf">VTA
SOP</a></TD>
<td width="19%" valign=top><a
href="https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-272511/C75-PR-CPR-VTRF-R4.pdf">CP-C75-CPR-VTRF-R4</a> – VTA cryogenic RF test procedure for C75 cavities</TD>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
<td width="20%" valign=top>Drawing</TD>
</tr>
<tr>
<td width="19%" valign=top> </td>
<td width="19%" valign=top><a
href="https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-254362/VTRF_Data_Processing_Spreadshet_Templete.xlsm">Excel
macro for C75-CPR-VTRF</a></TD>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
<td width="20%" valign=top> </td>
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<tr>
<td width="20%" valign=top>Revision Note</TD>
<td width="80%" valign=top> </td>
</tr>
<tr>
<td width="20%" valign=top>R1</TD>
<td width="80%" valign=top>Initial release of this Traveler.</TD>
</tr>
<tr>
<td width="20%" valign=top>R2</TD>
<td width="80%" valign=top>Added performance limit</TD>
</tr>
<tr>
<td width="20%" valign=top>R3</TD>
<td width="80%" valign=top>Updated link to the test procedure and added fields for
Multipacting and Lorentz force detuning coefficient</TD>
</tr>
<tr>
<td width="20%" valign=top>R4</TD>
<td width="80%" valign=top>Updated the high and low frequency specifications</TD>
</tr>
<tr>
<td width="20%" valign=top>R5</TD>
<td width="80%" valign=top>Add: Hold point, highlight in yellow item that will cause
an NCR to be created, administrative limit of 21 MV/m, list all cavity
qualifications, correct link to RF data processing macro.</TD>
</tr>
<tr>
<td width="20%" valign=top>R6</TD>
<td width="80%" valign=top>Step 18 updated step for performing an Unscaled Quench
field Measurement with the step number in the procedure.</TD>
</tr>
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<tr>
<td width=62 valign=top>Step No.</TD>
<td width=301 valign=top>Instructions</TD>
<td width=501 nowrap valign=top>Data Input</TD>
</tr>
<tr>
<td width=62 valign=top>1</TD>
<td width=301 valign=top>Select C75 5-cell cavity serial number (SN). (ex.
5C75-RI-001)<BR/>
Note any special handling, processing (chemistry or bake)
or off-normal conditions associated with this cavity before test.</TD>
<td width=501 nowrap valign=top>[[CAVSN]] <<CAVSN>><BR/>
[[SpecialHandling]] <<COMMENT>></TD>
</tr>
<tr>
<td width=62 valign=top>2</TD>
<td width=301 valign=top>Is this cavity part of a hermetic pair? If YES, note
cavity serial number and cavity position on the test stand.</TD>
<td width=501 nowrap valign=top>[[PartOfPair]] <<YESNO>><BR/>
[[CPRSN]] <<CPRSN>><BR/>
[[C75CavPosition]] {{Top,Bottom}} <<SELECT>></TD>
</tr>
<tr>
<td width=62 valign=top>3</TD>
<td width=301 valign=top>Record if cavity is mechanically constrained (i.e. tuner
attached, etc.).</TD>
<td width=501 nowrap valign=top>[[TunerAttached]] <<YESNO>></TD>
</tr>
<tr>
<td width=62 valign=top>4</TD>
<td width=301 valign=top>Enter the LabView file name, without special characters.</TD>
<td width=501 nowrap valign=top>[[LabviewFile]] <<TEXT>></TD>
</tr>
<tr>
<td width=62 valign=top>5</TD>
<td width=301 valign=top>Record Test Date, Dewar No, VTA Test Stand Serial Number
and Operator(s).</TD>
<td width=501 nowrap valign=top>[[TestDate]] <<TIMESTAMP>><BR/>
[[Dewar]]{{8,4,7,3}} <<SELECT>><BR/>
[[TSTDSN]]<<TSTDSN>><BR/>
[[TestOperator1]]
{{KDavis,CWilson,Liang,POwen,Reece,Powers,GCiovati,AdamG,Stirbet,None}}
<<SELECT>><BR/>
[[TestOperator2]]
{{KDavis,CWilson,Liang,POwen,Reece,Powers,GCiovati,AdamG,Stirbet,None}}
<<SELECT>></TD>
</tr>
<tr>
<td width=62 valign=top>6</td>
<td width=301 valign=top>If testing a single cavity, record cavity vacuum pressure.
Cavity pairs are isolated per procedure and are not instrumented for vacuum
readback. If the cavity pressure is <2e-5 mbar an RF test can be
attempted.</TD>
<td width=501 nowrap valign=top>[[CavityVacuum]] <<SCINOT>> <BR/>
[[CavityVacuumUnits]]{{(mbar),(Torr),(Pa)}}
<<SELECT>><BR/>
[[CavityVacuumOK]] <<YESNO>><BR/>
[[CavityVacuumComment]] <<COMMENT>></TD>
</tr>
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width="99%">
<tr>
<td width="9%">Step No</TD>
<td width="53%">Instructions</TD>
<td width="36%">Data Inputs</TD>
</tr>
<tr>
<td width="9%" valign=top>7</TD>
<td width="53%" valign=top>Record Dewar helium bath liquid level, temperature and
baratron pressure. <BR/>
Start cavity testing at (29 +/-0.1) Torr.</TD>
<td width="36%" valign=top>[[DewarLHeLevelcm]] <<FLOAT>> (cm)<BR/>
[[DewarTempK]]<<FLOAT>>(K)<BR/>
[[DewarPressureTorr]]<<FLOAT>>(Torr)</TD>
</tr>
<tr>
<td width="9%" valign=top>8</TD>
<td width="53%" valign=top>Zero power meters then calibrate cables at cavity
fundamental frequency. If NO option is chosen launch D3 and record pertinent
information.</TD>
<td width="36%" valign=top>[[PowermetersZeroed]] <<YESNO>><BR/>
[[CableCalibrationOK]] <<YESNO>><BR/>
[[CableCalibrationComment]] <<COMMENT>></TD>
</tr>
<tr>
<td width="9%" valign=top>9</TD>
<td width="53%" valign=top>Perform low power measurements using a network analyzer
(measure the five cavity mode frequencies). <BR/>
Record the cavity mode frequencies at the right. <BR/>
Example of cavity mode frequencies:<BR/>
Pi = 1497.388 MHz<BR/>
4Pi5 = 1492.711 MHz<BR/>
3Pi5 = 1480.413 MHz<BR/>
2Pi5 = 1466.088 MHz<BR/>
1Pi5 = 1454.720 MHz</TD>
<td width="36%" valign=top>[[Freq_Pi]] <<FLOAT>> MHz<BR/>
[[Freq_4Pi5]] <<FLOAT>> MHz<BR/>
[[Freq_3Pi5]] <<FLOAT>> MHz<BR/>
[[Freq_2Pi5]] <<FLOAT>> MHz <BR/>
[[Freq_1Pi5]] <<FLOAT>> MHz</TD>
</tr>
<tr>
<td width="9%" valign=top>10</TD>
<td width="53%" valign=top>At 2.07 K determine and record dewar pressure (baratron)
and cavity Pi-mode lock frequency precisely with LLRF frequency counter.<BR/>
Lock frequency specifications: Low: 1497.375 MHz<BR/>
High: 1497.575 MHz<BR/>
Launch NCR if frequency specification is not met</TD>
<td width="36%" valign=top>[[LockFrequency]] <<FLOAT>> (MHz)<BR/>
[[LockFreqMeetsSpec]] <<YESNO>></TD>
</tr>
<tr>
<td width="9%" valign=top>11</TD>
<td width="53%" valign=top>At 2.07 K and cavity field of 4-5 MV/m, determine cavity
coupling state.</TD>
<td width="36%" valign=top>[[CavityCoupling]] {{Overcoupled,Undercoupled,Critically_coupled}}
<<SELECT>></TD>
</tr>
<tr>
<td width="9%" valign=top>12</TD>
<td width="53%" valign=top>Perform decay measurements and record Eacc, Qo, Qext2,
Qext1, %error, Tau, radiation, chosen for CW high power tests as specified.
More information regarding these parameters can be found in CavID raw
data.txt or CavID processed data.xlsx.<BR/>
Typical values during decay measurements for:<BR/>
Eacc: (4-5) MV/m<BR/>
Qo: 1.0-1.6 e10<BR/>
Qext1: 0.5-2.4 e10<BR/>
Qext2: 0.8-3 e12<BR/>
error: 8-13%<BR/>
Tau : 0.3-1.2 s<BR/>
Radiation : 1e-3 mR/hr</TD>
<td width="36%" valign=top>[[Eacc]] <<FLOAT>> MV/m<BR/>
[[Qo]] <<SCINOT>><BR/>
[[QextIn]] <<SCINOT>><BR/>
[[QextFp]] <<SCINOT>><BR/>
[[QextFpError]] <<FLOAT>> %<BR/>
[[Tau]] <<FLOAT>> Seconds<BR/>
[[Rad]] <<SCINOT>> mR/hr</TD>
</tr>
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<td width="4%"><br clear=all
style='page-break-before:always'>
Step No</TD>
<td width="40%">Instructions</TD>
<td width="55%">Data Inputs</TD>
</tr>
<tr>
<td width="4%" valign=top>13</TD>
<td width="40%" valign=top>In Pi mode, test the cavity performance over its full
dynamic range at 2.07 K. Be sure to capture a clean final-state data set from
which to generate the post-processing Qo-vs-Eacc, Rad-vs-Eacc and f-vs-Eacc2
curves.<BR/>
At 2.07 K record:<BR/>
Final Maximum cavity gradient stably achieved Emax.<BR/>
Final Qo value at maximum cavity gradient.<BR/>
Final Qo at (20.5+/-0.3) MV/m. Acceptance criteria Qo
>= 8e9.<BR/>
Cavity gradient at Qo specification (8e9)<BR/>
Initial value for Radiation at (20.5+/-0.3) MV/m.<BR/>
Initial FEonset: onset of field emission (FE onset,
defined to be the first measured gradient where measured radiation is >=
3e-2 mR/hr). <BR/>
RadMax: value for the highest radiation level inside Dewar
lid.<BR/>
Final Qo at Eacc= (4 +/- 0.3)MV/m.</TD>
<td width="55%" valign=top>[[EmaxMVm]] <<FLOAT>> MV/m<BR/>
[[QoAtEmax]] <<SCINOT>><BR/>
[[QoAt20_5MVm]] <<SCINOT>><BR/>
[[EmaxAtQo_Spec]] <<SCINOT>> MV/m<BR/>
[[Init_RadAt20_5MVm]] <<SCINOT>> mR/h<BR/>
[[Init_FEonsetMVm]] <<FLOAT>> MV/m<BR/>
[[RadMax]] <<SCINOT>> mR/h<BR/>
[[QoAt4MVm]] <<SCINOT>></TD>
</tr>
<tr>
<td width="4%" valign=top>14</TD>
<td width="40%" valign=top>Enter the value of the Lorentz force coefficient KL. Acceptable
range: -3.7 to -4.2 Hz/(MV/m)2</TD>
<td width="55%" valign=top>[[LorentzForceCoeff]] <<FLOAT>> Hz/(MV/m)^2</TD>
</tr>
<tr>
<td width="4%" valign=top>15</TD>
<td width="40%" valign=top>Record if multipacting (MP) was found during the test, the
Eacc at which occurred and if it was successfully processed.<BR/>
The C75 cavities have a "soft" MP barrier at 12-15
MV/m and a strong MP barrier at 17-24 MV/m.</TD>
<td width="55%" valign=top>[[MultipactingFound]] <<YESNO>><BR/>
[[MultipactingGradient]] <<FLOAT>> MV/m<BR/>
[[MultipactingProcessed]] <<YESNO>><BR/>
[[MultipactingComment]] <<COMMENT>></TD>
</tr>
<tr>
<td width="4%" valign=top>16</TD>
<td width="40%" valign=top>At 2.07 K, was cavity RF processed to achieve performances
over 20.5 MV/m. Record pertinent information at the right and lunch NCR if
cavity RF processing was unsuccessful in achieving 20.5 MV/m with a Qo of
8e9.</TD>
<td width="55%" valign=top>[[RFProcessing]] <<YESNO>><BR/>
[[RFProcessingComment]] <<COMMENT>></TD>
</tr>
<tr>
<td width="4%" valign=top>17</TD>
<td width="40%" valign=top>Record after RF processing at 2.07 K:<BR/>
Post-processing Radiation at (20.5+/-0.3) MV/m.<BR/>
Post-processing FEonset: onset of field emission (FE
onset, defined to be the first measured gradient where measured radiation is
>= 3e-2 mR/hr).<BR/>
Post-processing RadMax value for the highest radiation
level inside Dewar lid.</TD>
<td width="55%" valign=top>[[PP_RadAt20_5MVm]] <<SCINOT>> mR/h<BR/>
[[PP_FEonsetMVm]] <<FLOAT>> MV/m<BR/>
[[PP_RadMax]] <<SCINOT>> mR/h</TD>
</tr>
<tr>
<td width="4%" valign=top>18</TD>
<td width="40%" valign=top>At 2.07 K, if cavity is quench limited below Eacc 20.5
MV/m, find the unscaled Quench fields for each member of the fundamental
passband as described in Section 8, Step 10 of C75-PR-CPR-VTRF and Launch
NCR.</TD>
<td width="55%" valign=top>[[EaccQuench_4Pi5]] <<FLOAT>> MV/m<BR/>
[[EaccQuench_3Pi5]] <<FLOAT>> MV/m<BR/>
[[EaccQuench_2Pi5]] <<FLOAT>> MV/m<BR/>
[[EaccQuench_1Pi5]] <<FLOAT>> MV/m<BR/>
[[QuenchStudyComment]] <<COMMENT>></TD>
</tr>
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<tr>
<td width="5%" colspan=2>Step No</TD>
<td width="39%">Instructions</TD>
<td width="55%" colspan=2>Data Inputs</TD>
</tr>
<tr>
<td width="4%" valign=top>19</TD>
<td width="39%" colspan=2 valign=top>The cavity criteria to pass:<BR/>
Eacc >= 20.5 MV/m with a Qo >= 8e9.<BR/>
If the cavity does not meet the above criteria, record
performance limitation.<br>
Definition of performance limitation terms:<BR/>
<p class=MsoListParagraphCxSpFirst><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>Administrative Gradient: 21 MV/m<BR/>
<p class=MsoListParagraphCxSpMiddle><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>Administrative Radiation: 1R/h admin limit<BR/>
<p class=MsoListParagraphCxSpMiddle><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>FieldEmission: FE loaded Qo curve<BR/>
<p class=MsoListParagraphCxSpMiddle><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>Quench: non-FE related quench limit<BR/>
<p class=MsoListParagraphCxSpMiddle><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>Multipacting<BR/>
<p class=MsoListParagraphCxSpMiddle><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>RF power: test limited by available RF power<BR/>
<p class=MsoListParagraphCxSpMiddle><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>Cable: test aborted due to cable breakdown or broken cable<BR/>
<p class=MsoListParagraphCxSpLast><span
style='font-family:Symbol'>·<span style='font:7.0pt "Times New Roman"'> </span></span>Other: RF Tester defined<BR/>
If Other is selected, record pertinent information in the
Comment box at the right.</TD>
<td width="55%" colspan=2 valign=top>[[PerformanceLimit]]
{{Quench,FieldEmission,Multipacting,RFPower,Cable,Admin,Other}}
<<SELECT>><BR/>
[[PerformanceLimitComment]] <<COMMENT>></TD>
</tr>
<tr>
<td width="4%" valign=top>20</TD>
<td width="39%" colspan=2 valign=top>Upload the raw data file with VTA RF testing results using
file name: CavID raw data.txt.</TD>
<td width="55%" colspan=2 valign=top>[[RF_test_raw_data]] <<FILEUPLOAD>></TD>
</tr>
<tr>
<td width="4%" valign=top>21</TD>
<td width="39%" colspan=2 valign=top>Upload processed (Excel) data file results using file
name: CavID processed data.xlsx</TD>
<td width="55%" colspan=2 valign=top>[[RF_test_processed]] <<FILEUPLOAD>></TD>
</tr>
<tr>
<td width="4%" valign=top>22</TD>
<td width="39%" colspan=2 valign=top>Upload processed Qo-and-Rad -vs-Eacc graph (in PDF format)
using file name: QoandRadvsEacc.pdf <BR/>
Upload processed f-vs-Eacc2 graph (in PDF format) using
file name: CavID_FreqvsEacc2.pdf</TD>
<td width="55%" colspan=2 valign=top>[[UploadQvsE_Rad]] <<FILEUPLOAD>><BR/>
[[UploadFvsE2]] <<FILEUPLOAD>></TD>
</tr>
<tr>
<td width="4%" valign=top>23</TD>
<td width="39%" colspan=2 valign=top>For a cavity pair test, measure the frequencies and loaded
Q of all HOMs in the frequency range 1.74 GHz – 2.20 GHz for each cavity of
the pair.<BR/>
Upload an Excel Spreadsheet with the HOM data using
filename: CavID_HOM.xlsx.</TD>
<td width="55%" colspan=2 valign=top>[[UploadHOMFile]] <<FILEUPLOAD>></TD>
</tr>
<tr>
<td width="4%" valign=top>24</TD>
<td width="56%" colspan=3 valign=top>Cavity passed all specifications for this traveler? If NO
option is chosen issue an NCR from this traveler.<BR/>
Issues that require an NCR opened:<BR/>
<p class=MsoListParagraphCxSpFirst>1.<span
style='font:7.0pt "Times New Roman"'> </span>Cavity
does not meet frequency specification.<BR/>
<p class=MsoListParagraphCxSpLast>2.<span
style='font:7.0pt "Times New Roman"'> </span>Cavity
RF processing was unsuccessful in achieving 20.5 MV/m with a Qo of 8e9.<BR/>
Cavity is quench limited below Eacc 20.5 MV/m.</TD>
<td width="38%" valign=top>[[CavityMeetsSpecifications]] <<YESNO>><BR/>
[[HOLDPOINT]] {{gciovati,kdavis}}
<<HOLDPOINT>> </TD>
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