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TD24 in TBTS data analysis

TD24 in TBTS data analysis. CLIC RF Structure Development Mtg , Alexey Dubrovskiy. 27.07.11. Outlines. History of Processing Explicit BDR measurements Accelerating gradient and pulse length dependency with BDR Stress dependency with BDR Vacuum level Breakdown distribution.

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TD24 in TBTS data analysis

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  1. TD24 in TBTS data analysis CLIC RF Structure Development Mtg, Alexey Dubrovskiy 27.07.11

  2. Outlines • History of Processing • Explicit BDR measurements • Accelerating gradient and pulse length dependency with BDR • Stress dependency with BDR • Vacuum level • Breakdown distribution CLIC RF Structure Development Mtg Alexey Dubrovskiy 27.07.11 2

  3. Table of parameters for TD24_vg1.8_disk CLIC RF Structure Development Mtg Alexey Dubrovskiy 27.07.11 * A. Grudiev, 25/03/10 3

  4. Summary of ACS processing CLIC RF Structure Development Mtg Alexey Dubrovskiy * At the beginning of 2011 the ACS was taken out and retuned 27.07.11 4

  5. Processing during the last 4 weeks Vacuum level Forward peak power Pulse length at 75% of pp Pulse length at 90% of pp CLIC RF Structure Development Mtg Alexey Dubrovskiy Number of BD BDR 27.07.11 5

  6. Explicit BDR measurements ~E30 ~E11 bdpppm CLIC RF Structure Development Mtg Alexey Dubrovskiy MV / m BDR is scaled to a pulse length of 160ns: slim line - τ6 and bold line - τ3. 27.07.11 6

  7. 3 Periods of Processing Forward peak power Vacuum level Periods 1 2 3 3 1 2 Pulse length at 75% of pp Pulse length at 90% of pp CLIC RF Structure Development Mtg Alexey Dubrovskiy Number of BD BDR 27.07.11 7

  8. Accelerating gradient vs BDR From data fitting: Period 1: Ec ~ τ1/3.9 Period 2: Ec~ τ1/3.8 Period 3: Ec~ τ1/4.1 bdpppm CLIC RF Structure Development Mtg Alexey Dubrovskiy MV / m BDR scaling low for rectangular pulses: BDR ~ Ecs1τs2 (Ecand τ – const.) Normalization low to the rectangular pulse of a pulse length of 160ns: Ec= (∫E(t)s1/s2dt / 160)s2/s1 27.07.11 8

  9. Pulse length vs BDR From data fitting: Period 1: Ec ~ τ1/4.0 Period 2: Ec~ τ1/3.4 Period 3: Ec~ τ1/3.7 bdpppm CLIC RF Structure Development Mtg Alexey Dubrovskiy ns BDR scaling low for rectangular pulses: BDR ~ Ecs1τs2 (Ecand τ – const.) Normalization low to the rectangular pulse of an accelerating gradient of 100 MV/m: τ= ∫E(t)s1/s2dt / 100s1/s2 27.07.11 9

  10. Stress vs BDR bdpppm CLIC RF Structure Development Mtg Alexey Dubrovskiy MV / m BDR scaling low for rectangular pulses and constant temperature: BDR ~ exp(a Ec2)(Ec– const.) * FlyuraDjurabekova (25.05.2011) Normalization low to the rectangular pulse of a pulse length of 160ns: Ec=(∫E(t)4dt / 160)1/4 27.07.11 10

  11. Vacuum level CLIC RF Structure Development Mtg Alexey Dubrovskiy 27.07.11 11

  12. Breakdown distribution CLIC RF Structure Development Mtg Alexey Dubrovskiy 27.07.11 * Walter Wuensch (06.05.2011) 12

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