1 / 14

TERA Foundation

Expected Performances of TERA High- Gradient Accelerating Structures. TERA Foundation. Silvia Verdú Andrés. U. Amaldi, A. Degiovanni. November 23, 2011 CLIC RF structure development meeting. Motivation.

eman
Download Presentation

TERA Foundation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Expected Performances of TERA High-GradientAcceleratingStructures • TERA Foundation Silvia Verdú Andrés U. Amaldi, A. Degiovanni • November 23, 2011 • CLIC RF structure development meeting

  2. Motivation Thehadrontherapycommunitydemands a compact, reliableacceleratorwiththeappropriatebeam performancesfortumourtreatmentwithions.

  3. Motivation Thehadrontherapycommunitydemands a compact, reliableacceleratorwiththeappropriatebeam performancesfortumourtreatmentwithions. CABOTO is a copper standing-wave Side-Coupled Linacoperating at 5.7 GHz. Thelinaclengthcould be reducedifhighacceleratinggradients(~ 35 MV/m) wereachievedforanacceptablevalue of breakdowns(BDR ~ 10-6 bpp/m), as breakdowscompromisethe machine reliability.

  4. Motivation Thehadrontherapycommunitydemands a compact, reliableacceleratorwiththeappropriatebeam performancesfortumourtreatmentwithions. CABOTO is a copper standing-wave Side-Coupled Linacoperating at 5.7 GHz. Thelinaclengthcould be reducedifhighacceleratinggradients(~ 35 MV/m) wereachievedforanacceptablevalue of breakdowns(BDR ~ 10-6 bpp/m), as breakdowscompromisethe machine reliability. Which are the expectedhigh gradient performances for such a machine?

  5. Experimentalevidence • TERA 3 GHz single-cellcavity……………………………………………….… testsongoing • TERA 5.7 GHz single-cellcavity……………………………………….……… tuning • Frascati@KEK 5.7 GHz structure…..........................……………… tested! • Severalstructures at 12 and 30 GHz………………………………..……. scalinglawsbutapplicability? Frascati@KEK 5.7 GHz TERA 3 GHz *scaledto BDR = 10-6bpp/m; tp=200 ns

  6. Structurecharacteristics TheFrascati@KEKstructureisa 5.7 GHz travelling-wave (TW)structuremade in copper. It has beendesignedtoacceleraterelativisticelectrons (Es/E0 ~ 2). Thestructurewastestedwith a 0.2 ms-long RF pulse.

  7. Structurecharacteristics TheFrascati@KEKstructureisa 5.7 GHz travelling-wave (TW)structuremade in copper. It has beendesignedtoacceleraterelativisticelectrons (Es/E0 ~ 2). Thestructurewastestedwith a 0.2 ms-long RF pulse. CABOTO is a standing-wave (SW)structuremade in copper. It has beendesignedtoacceleratenon-relativistichadrons. Therefore, acceleratingcellspresent «noses» in ordertoimproveaccelerationbutthen Es/E0 ~ 4—5. Typical RF pulse fortherapyapplicationwould be 2 ms-long. « nose »

  8. Structurecharacteristics TheFrascati@KEKstructureisa 5.7 GHz travelling-wave (TW)structuremade in copper. It has beendesignedtoacceleraterelativisticelectrons (Es/E0 ~ 2). Thestructurewastestedwith a 0.2 ms-long RF pulse. CABOTO is a standing-wave (SW)structuremade in copper. It has beendesignedtoacceleratenon-relativistichadrons. Therefore, acceleratingcellspresent «noses» in ordertoimproveaccelerationbutthen Es/E0 ~ 4—5. Typical RF pulse fortherapyapplicationwould be 2 ms-long. « nose » Assumptions • Applicability of results of TW to SW. • Validity of modifiedPoynting vector and associatedscalinglaws. • Validity of pulse lengthscalinglaws.

  9. Scaling and expected performances Frascati@KEK 5.7 GHz *scaledto BDR = 10-6bpp/m; tp=200 ns

  10. Scaling and expected performances Frascati@KEK 5.7 GHz *scaledto BDR = 10-6bpp/m; tp=200 ns

  11. Scaling and expected performances Frascati@KEK 5.7 GHz *scaledto BDR = 10-6bpp/m; tp=200 ns Attention: Z, Sc/E0 and Rboreaffect E0, linaclength and powerrequirement!

  12. Conclusions • Maximum achievableaverage axial field for the TERA C-band structures isaround 40 MV/m. (assumptions: • TW and SW are comparable • ModifiedPoyntingvector and associatedscalinglawsvalidity • Pulse lengthscalinglawsvalidity) • High power tests of the C-band TERA prototypes are useful to: 1) Check the validity of the scalinglaws. 2) Increase the statistics of RF high power measurementsat 5.7 GHz. [TERA] Drive the choice of the mostsuitedcellgeometry for the CABOTO-C design. • High-power test of the TERA 3 GHz single-cellcavity gains in importance: 1) Comparison of structures in S, C and X-bands. 2) Validation of modifiedPoyntingvector.

  13. Conclusions • Maximum achievableaverage axial field for the TERA C-band structures isaround 40 MV/m. (assumptions: • TW and SW are comparable • ModifiedPoyntingvector and associatedscalinglawsvalidity • Pulse lengthscalinglawsvalidity) • High power tests of the C-band TERA prototypes are useful to: 1) Check the validity of the scalinglaws. 2) Increase the statistics of RF high power measurementsat 5.7 GHz. [TERA] Drive the choice of the mostsuitedcellgeometry for the CABOTO-C design. • High-power test of the TERA 3 GHz single-cellcavity gains in importance: 1) Comparison of structures in S, C and X-bands. 2) Validation of modifiedPoyntingvector.

  14. Conclusions • Maximum achievableaverage axial field for the TERA C-band structures isaround 40 MV/m. (assumptions: • TW and SW are comparable • ModifiedPoyntingvector and associatedscalinglawsvalidity • Pulse lengthscalinglawsvalidity) • High power tests of the C-band TERA prototypes are useful to: 1) Check the validity of the scalinglaws. 2) Increase the statistics of RF high power measurementsat 5.7 GHz. [TERA] Drive the choice of the mostsuitedcellgeometry for the CABOTO-C design. • High-power test of the TERA 3 GHz single-cellcavity gains in importance: 1) Comparison of structures in S, C and X-bands. 2) Validation of modifiedPoyntingvector. Thanks for your attention

More Related