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CIEMAT CONTRIBUTION TO TBL PETS (January 2009)

This article outlines CIEMAT's role in developing Test Beam Line (TBL) Power Extraction & Transfer Structure (PETS) prototypes for generating 12 GHz RF power. It discusses the design, fabrication challenges, RF measurements, and future work required for optimal performance. The piece also touches on CIEMAT's contribution to a Race Track Microtron (RTM) project for medical purposes.

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CIEMAT CONTRIBUTION TO TBL PETS (January 2009)

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  1. CIEMAT CONTRIBUTION TO TBL PETS (January 2009) David Carrillo on behalf of the Accelerators Team

  2. TBL - PETS (Test Beam Line - Power Extraction & Transfer Structure) • CIEMAT is responsible for TBL PETS prototype • PETS should generate 12 GHz RF power in interaction with the drive beam • 16 PETS will be placed at TBL to test stability of the decelerated beam

  3. PETS RF designs 30 GHz PETS designed by D.Carrillo (CIEMAT) & I.Syratchev (CERN) 12 GHz PETS designed by I.Syratchev (CERN) • Single choke mirror • Two waveguide extractor

  4. PETS: General layout Fiducials Cooling pipes WR90 waveguide Copper rods Power extractor Vacuum port Supports

  5. Copper rods • Each PETS is made of eight OFE copper rods (800 mm) • These are the most difficult parts to fabricate: overall tolerance is +/- 0.02 mm and roughness should be better than 0.4 micron • The coupling cell is smaller: two different tools are necessary • Two intermediate thermal treatments to release internal stresses Copper rod

  6. Single rod RF test bench • A special test bench has been designed to do RF measurements on each rod • Dummy rod phase slip was 121° for 123 cells, that is, about 1° per cell • Results agree with 3-D measurements HFSS model E field and probe Mode TE10 Phase S31 vs position

  7. RF absorbers • Several samples from different companies (SiC, AlN composite) were tested at CERN and CIEMAT • The present PETS prototype will not have absorbers. Further work is necessary for the future RF absorbers Measuring electrical properties of ceramics

  8. Power extractor • It consists of three disks of 140 mm diameter • They will be brazed with a 1 mm wire, 78Ag22Cu alloy • The waveguides have three flanges, the two outermost of them should be vacuum tight Eight rods RF test bench • A special test bench has been designed to measure the assembly of rods • Mode launchers have been optimized to create the working mode in the PETS, using the coaxial cable coming from the network analyzer • A coaxial antenna will measure the field through the slots between the rods

  9. Vacuum tank • 316LN CF flanges • Two pumping ports: ionic and turbo • Instrumentation ports: temperature sensors and four for assembly and free for future uses • Reference pins at the endplates Cooling • Round ¼” OFE copper pipe • 1 m/s, 0.3 bar pressure drop, four circuits, 2°C estimated temperature increase • Vacuum-tight stainless steel connectors brazed to copper pipes, using Helicoflex gaskets

  10. CIEMAT contribution to a Race Track Microtron: LINAC David Carrillo on behalf of the Accelerators Team

  11. RTM (Race Track Microtron) Layout • RTM IORT (Intraoperative radiation therapy ) • Electron beam up to 12 MeV • CIEMAT is responsible for LINAC (1) Electron gun (2) LINAC (3) (4)end magnets M1 & M2 (5) Quadrupole lens (6) Extraction magnets (7) Extracted beam

  12. E field H field RTM (Race Track Microtron) LINAC design Biperiodic structure f = 5.712 GHz HFSS model Accelerating cell without nose cones for testing Cavity test RF measurements Solid works model

  13. Conclusions • Eight 800 mm long copper rods (1 PETS) have been machined and will be assembled and measured next month • Two RF measurement benches, both for a single rod or eight ones, have been developed • No material has been identified as a good RF absorber up to now: it is necessary for CLIC PETS • CERN and CIEMAT will share the production of the next seven PETS units to be installed before the end of 2010 • CIEMAT is responsible for a small LINAC for an RTM with medical purposes

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