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LOI PROGRESS: JANUARY 2008 AT THE HALL 2 Yoshiro Irie, KEK for the LOI/SH collaboration LOI PROGRESS: JANUARY 2008 AT THE HALL 2 Yoshiro Irie, KEK for the LOI/SH collaboration XII-th Collaboration Meeting Jan 18, [email protected]'s House 1

FLOWER OF THE DAY XII-th Collaboration Meeting Jan 18, 2008@Cosener's House winter cherry! 2 FLOWER OF THE DAY XII-th Collaboration Meeting Jan 18, [email protected]'s House winter cherry! 2

PAST 1 at the MICE Hall in August 25, 2005 MICE HALL in December, PAST 1 at the MICE Hall in August 25, 2005 MICE HALL in December, 2004. XII-th Collaboration Meeting RF envelopes and 50 Hz gate pulse. From top trace, ch. 1 driver stage voltage (120×), ch. 2 cavity gap voltage (1, 666×), ch. 3 cavity input current (20 A/V) and ch. 4 50 Hz gate pulse. 15. 1 V peak-to-peak at ch. 2 corresponds to 12. 6 KV peak per gap. Jan 18, [email protected]'s House 3

PAST 2 n at the Hall 2 in June , 2007 ~10 k. Vpeak PAST 2 n at the Hall 2 in June , 2007 ~10 k. Vpeak per gap obtained at 2. 17 MHz without bias current (just recovered to the status in December, 2004) gap voltage (X 1, 666) XII-th Collaboration Meeting Jan 18, [email protected]'s House 4

PRESENT n n n at the Hall 2 in January, 2008 tested in a PRESENT n n n at the Hall 2 in January, 2008 tested in a frequency swept mode at 50 Hz ~11 k. Vpeak per gap obtained near at the B-minimum operation limits: fault of triode grid supply and over-current of triode anode supply gap voltage (X 1, 666) gap input current (0. 1 volt/amp) grid voltage (X 121) grid input current (0. 1 volt/amp) XII-th Collaboration Meeting Jan 18, [email protected]'s House 5

REQUIREMENTS PRIOR TO THE EXPERIMENTS n n need a softer step-start, otherwise blow fuses REQUIREMENTS PRIOR TO THE EXPERIMENTS n n need a softer step-start, otherwise blow fuses at the H. P. R. F switchboard, increase power capacity of a variac for the screen psu, reinforce the by-pass capacitor at the input of grid bias supply in the LOI, newly install the grid input current monitor, increase the Buck Regulator output power threshold. : All done successfully XII-th Collaboration Meeting Jan 18, [email protected]'s House 6

CAPACITOR BLOW June 7, 2007 capacitor blown at the DC output terminal reinforced to CAPACITOR BLOW June 7, 2007 capacitor blown at the DC output terminal reinforced to 28 n. F , Jan. 2008 replaced, Jan. 2008 XII-th Collaboration Meeting Jan 18, [email protected]'s House higher power capacitor fixed at the DC output terminal 7

FORWARD 1: Investigations n n waveform distortions? why the cavity impedance looks so low? FORWARD 1: Investigations n n waveform distortions? why the cavity impedance looks so low? l l l n n cavity impedance looks ~400 ohms at initial stage of acceleration cycle FT analysis in 2005 also showed 384 ohms our design assumption > 2 kohms (R Bendall, ISIS/DHRF/P 2/97) operation with feedback loops; AVC, phasing to fundamental cavity, cavity tuning, water supply at the SP 6 enough for the LOI HPD? l required: 396 liter /min. breakdown, 1643 Triode: 130 liter /min. 4648 Tetrode: 236 liter /min. Feedback shunt resistor: 30 liter /min. XII-th Collaboration Meeting Jan 18, [email protected]'s House 8

WAVEFORM DISTORTIONS 1. results in August, 2005 Waveform distortions at 2. 76, 4. 04, WAVEFORM DISTORTIONS 1. results in August, 2005 Waveform distortions at 2. 76, 4. 04, 5. 01 and 6. 20 MHz. (August, 2005) From top trace, ch. 1 driver stage voltage (x 120), 2. 76 MHz 4. 04 MHz ch. 2 cavity gap voltage (x 1, 666) ch. 3 cavity input current (20 A/V) and ch. 4 50 Hz gate pulse. 5. 01 MHz XII-th Collaboration Meeting 6. 20 MHz Jan 18, [email protected]'s House 9

WAVEFORM DISTORTIONS -cont’d 2. this experiments similar results were obtained with the previous ones WAVEFORM DISTORTIONS -cont’d 2. this experiments similar results were obtained with the previous ones gap voltage (X 1, 666) delay from “T” : 1 msec ~2. 85 MHz gap input current (0. 1 volt/amp) grid voltage (X 121) grid input current (0. 1 volt/amp) delay from “T” : 5 msec ~5. 2 MHz XII-th Collaboration Meeting Jan 18, [email protected]'s House 10

OTHER WAVEFORMS ch 1. BR output voltage @J 2 (10 k. V/div) ch 2. OTHER WAVEFORMS ch 1. BR output voltage @J 2 (10 k. V/div) ch 2. BR output current @J 3 (12. 5 Amps/div) ch 3. driver anode current (inverted, 20 Amps/div) XII-th Collaboration Meeting Jan 18, [email protected]'s House 11

FORWARD 2: to-do-list n n n build a new breakout box at the SP FORWARD 2: to-do-list n n n build a new breakout box at the SP 6, lay cables between breakout boxes in Hall 2 and SP 6, etc. . END XII-th Collaboration Meeting Jan 18, [email protected]'s House 12