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TD24 R05 N1 after high-power test analysis plans

TD24 R05 N1 after high-power test analysis plans. A. Degiovanni, M. Aicheler, N. Mouriz Irazabal, A.T. Perez Fontenla, R. Wegner CLIC RF Structure Development Meeting 23/04/2014. Outline. History of the structure: EDMS : 1258457 – traveller of structure

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TD24 R05 N1 after high-power test analysis plans

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  1. TD24 R05 N1 after high-power test analysis plans A. Degiovanni, M. Aicheler, N. Mouriz Irazabal, A.T. Perez Fontenla, R. Wegner CLIC RF Structure Development Meeting 23/04/2014

  2. Outline • History of the structure: • EDMS: 1258457 – traveller of structure • EDMS: 1239394 – RF tuning (22-24.08.2012, Vasim+Rolf) • EDMS: 1306038 – post high power operation analysis • Observations: • detuning of coupling cells (last cell frequency decrease, opposite to T(D)18) • hot cell developed during high power operations ( Wilfrid’s analysis) • What needs to be done? • metrology measurements (for better understanding detuning effect) • hot cells analysis (BD distribution) • B-arc features (EDMS: 1096980, TD18 KEK/SLAC post mortem observations) • samples (octant/quadrant) for collaborators • Possible cutting methods • Proposal(s) for TD24

  3. Cells nomenclature 1: input coupler 26: output coupler 2: first regular cell 25: last regular cell 5

  4. TD24R05 normalized BD distribution 23 18 13 8 Cells nb. 5 3 8h. Records nb. 1 time Hot cells (5 and 6) have appeared from record #50 The very high peak values are an artifact of the normalization (if only 2 BDs during a record these cells will result very active)

  5. Comparison of Beadpull measurements Re  coupling; little changes Im detuning; strong 25,26; some 1,2 Preliminary RF measurements analysis of TD24 from CLEX, Rolf Wegner, 14.08.2013

  6. Comparison of detuning of different structures Rolf Wegner

  7. Milling and grooving Cutting methods Turning and ripping apart Wire Electrical Discharge Machining (EDM) Sawing Water-jet cutting Abrasive saw cutting

  8. Cutting methods

  9. Cutting methods

  10. Cutting methods

  11. Cutting issues • copper-air transition due to the damping waveguides • iris thickness + holes for dimple tuners • length of the structure for rotating support • …

  12. Overall cutting scheme for TD24 • Remove the flanges • transverse cutting of the two extremities • longitudinal cut for metrology of input and output coupler • slicing of cells number 4-5-6&21-22-23 for iris inspection • (cut of central cells 12-14 and metrology check for comparison with couplers) 5

  13. Cutting scheme 1 for TD24 • Remove the flanges by EDM • transverse cutting of the two extremities by EDM • longitudinal cut for metrology of input and output coupler by EDM • slicing of cells number 4-5-6&21-22-23 for iris inspection by EDM • (cut of central cells 12-14 as for step 2 and 3) 5

  14. Cutting scheme 2for TD24 • Remove the flanges by mechanical sawing • transverse cutting of the two extremities by mechanical sawing • longitudinal cut for metrology of input and output coupler by EDM • slicing of cells number 4-5-6&21-22-23 for iris inspection by mechanical sawing • (cut of central cells 12-14 as for step 2 and 3) 5

  15. Cutting scheme 3for TD24 • Remove the flanges by mechanical sawing • transverse cutting of the two extremities by milling/turning and ripping apart • longitudinal cut for metrology of input and output coupler by EDM • slicing of cells number 4-5-6&21-22-23 for iris inspection by milling/turning and ripping apart • (cut of central cells 12-14 as for step 2 and 3) 5

  16. Cutting scheme 4for TD24 • Remove the flanges by mechanical sawing • transverse cutting of the two extremities by abrasive low speed sawing • longitudinal cut for metrology of input and output coupler by EDM • slicing of cells number 4-5-6&21-22-23 for iris inspection by abrasive low speed sawing • (cut of central cells 12-14 as for step 2 and 3) 5

  17. Conclusion and discussion • Desired measurements: • Metrology on input and output coupler to better understand the observed frequency shift • BD distribution on cell 5 and adjacents to find and locate possible hot spot • other possible surface exploration and analyses (also samples to collaborators) • Four proposed options to be chosen from • Do we want to study the option of a low speed abrasive saw? • Do we want to study the option of the water jet cutting?

  18. thank you for your attention

  19. TD24_vg1.8_R05 https://edms.cern.ch/file/1093645/2/CLIAAS120079_-_ASSEMBLY.pdf input ports

  20. https://edms.cern.ch/file/1093645/2/CLIAAS120077_-_STANDARD_CELL.pdfhttps://edms.cern.ch/file/1093645/2/CLIAAS120077_-_STANDARD_CELL.pdf

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