IPBPM status Siwon Jang KNU Contents The electronics

IP-BPM status Siwon Jang KNU

Contents • The electronics repair status – Repair work status – Electronics RF test (by using Oscilloscope) – Electronics shipment to KEK • May beam test plan – Basic system check – Beam test scheme – Test list

The repair status for KNU electronics • Whole the electronics was repaired at this week Monday. – – – 12 mixer parts were replaced to new mixers. The resister part was replaced to original values. The total conversion gain of electronics was set to 54 d. B. The IF offset voltage was set to 0 m. V (± 700 u. V). The electronics will be sent to KEK at tomorrow by EMS. • After the repair work, the electronics was tested to check it’s performance. – – The 54 d. B gain was checked! The IF signal output voltage offset was set to 0 m. V (± 700 u. V). The linear range was checked but lower limit could not checked. LO input working range was checked!

The repair work for whole mixers Whole the mixer parts were replaced to new mixers at this week Monday. LO RF RF 19 d. B DA LNA 19 d. B DA Ring coupler BPF Mixer Hybrid Mixer

The linear range test of KNU electronics after repair works • RF test scheme S/G for LO LO KNU electronics S/G for RF RF IF Oscilloscope IF The IF signals were checked by using oscilloscope. The signal waveform was checked and the IF output power was checked by using FFT of oscilloscope.

Y-port electronics check • LO Frequency: 6. 404 GHz • RF Frequency: 6. 409 GHz • The Input RF power: -60 d. Bm • The Output IF power: -6 d. Bm – Total conversion gain = 54 d. B (for 5 Mhz difference) • The voltage offset setting – Within ± 700 u. V

Y-port electronics check • RF working range check!

Y-port electronics check • LO working range check! The LO input signals working range: -5 d. Bm to 25 d. Bm

Conclusion of electronics repair • The entire KNU electronics was repaired and the conversion gain was set to 54 d. B with almost 0 m. V voltage offset (Within ± 700 u. V) • The RF input power working range was -45 d. Bm to ~-100 d. Bm. However, we could not checked lower detection limit of electronics. For this, we will check again by using spectrum analyzer at KEK. • The LO input power working range was from -5 d. Bm to 25 d. Bm.

May beam test plan • We first will check the electronics performance (1 ~ 2 beam shift need) – The signal waveform will be checked and compare with previous beam test results. – The phase shifter performance will be checked. – Ref. cavity BPM output power check due to different beam intensity. – The beam test for 54 d. B calibration factors for x and y port with dynamic range check – The data taking and analysis program modify to use new ADC system from FONT group.

Further beam test plan • The X-Y isolation check with beam jitter at 10 x 1 optics (suggest by Oscar and Tauchi san) • The re-check for misalignment between IP-BPM A, B and C – Tilt misalignment is most important issue for higher beam position resolution study. • The resolution study of IP-BPM with 54 d. B electronics. • etc. . .

Ref. cavity output power check due to different beam intensity IPBPM Y-port V. Att to elec. Ref. Y-port Splitter to elec. Splitter to diode Half inch cables beam • Cable connection KNU electronics 45 d. B Charged ADC 14 bit Variable remote att. 10 d. B Att. The Ref. cavity BPM Output power will be checked by using Spectrum analyzer. (Max hold function Can measure pulsed signals during long pick up time. ) IPA IPB IP IPC Spectrum analyzer Ref. signal splitter Outside tunnel Inside tunnel Ref. cavity

Reference cavity output power check beam test • • • The LO working range of electronics was -5 d. Bm to 25 d. Bm. The input LO power in front of electronics should be larger than -5 d. Bm. However, the current beam test scheme can make out of working range for LO input signal so that we should check actual Ref. BPM output power level. - Cavity size : 42. 95 mm, 38. 65 mm - Beam Pipe radius: 8 mm (circular pipe) - Material of BPM: Stainless steel (SUS 304) IP-BPM set-up scheme until now From BPM -11 ~ 6 d. B Output signal strength = 5 ~ 22 d. B (0. 2 ~ 1 x 1. 6 n. C) 10 d. B Att. -6 d. B spliter loss From BPM 5 ~ 22 d. B

The BPM fabrication plan The Mr. Sandry will visit to KNU to discuss about new fabrication of IP-BPMs during 27~29 th May. April Ref. BPM order Sensor BPM Feed through May June Aug. Sep. RF Test Install Fabrication Test & Install Fabrication Design study order July fabrication Delivery Oct.