Beamline improvement during g2p experiment. Pengjia Zhu
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1 Beamline improvement during g2p experiment Pengjia Zhu
2 Review for g2p Q GeV2 o 6 forward angle detection
3 Review for g2p Polarized NH3 target 1K Refrigerator 2.5/5T Transverse target field Polarization influencing factors: Temperature Radiation damage Low Current ~ 50nA 1 inch
4 g2p Beamline Super Harp Tungsten Calorimeter Chicane Fast Raster NH3 Target BPM Slow Raster Septum,local dump BCM New for g2p: Slow Raster Chicane New BPM,BCM Receiver Super Harp Local Beam Dump Used before, added back: Tungsten Calorimeter Septum
5 Raster System + 1 inch AM 1/t 30Hz Sin 100Hz Triangle ~ 17KHz Fast Raster ~2mm Slow Raster ~2cm minimize depolarization reduce radiation damage less systematic error for target polarization measurement
6 Beam Position Monitor Space limit: <1m from FZ2 chicane magnet to target, Can not use cavity beam position monitor 2 M15 Antenna BPM and 1 superharp installed between target and FZ2 Cavity M15 Antenna BPM Target FZ1 Chicane Magnet FZ2 Chicane Magnet BPM harp
7 New BPM Receiver Y+ R = I 2+ Q 2 Q φ =tan 1 ( ) I X+ 15 M Cascaded integrator-comb filter dt Harmonic sampling Sample Rate:36MSPS Y X d dt Noise limit exclude out-of band signal Epics 1 1 sin θ sin ϕ= cos(θ ϕ) cos (θ+ ϕ) 2 2 X+ XY+ Y- LNA Multiply Mixer Filter 45MHz ADC IF Amp CIC Filter IIR Filter CORDIC Div >n DAQ 0~10V DAC 1497MHz Infinite impulse response filter BW=175Hz Local Oscillator 1452MHz Calculate R and φ Analog Part Digital Part We can not see fast raster signal Thanks John Musson,Trent Allison, Keith Cole
8 Harp 1H04 BPM Resolution BPMA BPMB Resolution: ~0.18mm in 50nA chicane BPM Harp BPM 1H05A 1H05A 1H05B Target BPMA is always good BPMB is worse than BPMA, more noise Using fake signal to test, the problem is not from BPM receiver Radiation damage and Magnet field(400gaus in BPMB, and 200gaus in BPMA) will affect it.
9 Super Harp > Calibrate 2 BPMs 50um wires Works in pulser beam mode Did the harp scan in ~5uA pulser beam At the same position took run in 100~50nA CW beam Calibrate in Straight Through Configuration Harp 1H04 Slow raster shape in Calibrated BPM Signal length Wire position(mm) chicane BPM Harp BPM 1H05A 1H05A 1H05B
10 Super Harp problem during experiment 1H04 Noise from wire motion High wire speed 1~6mm/s Low wire speed 0.5~1 mm/s 1H05A
11 New BCM Receiver Signal LNA Multiply Mixer Filter 45MHz IF Amp CIC Filter ADC IIR Filter Local Oscillator 1497MHz 1452MHz Analog Part Digital Part Calibration: Low current ~50nA Faraday Cup and Unser not working Use Tungsten Calorimeter Calorimeter BCM CORDIC Div >n DAC 0~10V DAQ
12 Tungsten Calorimeter > Calibrate BCM Use Temperature To Calibrate Charge Scaler Count Charge calculated charge with scaler count, Current using 25,50,75,100nA
13 Chicane Magnet 2.5/5T Transverse Target Magnet Field Used for banding beam to hall A dump Or minimize out of plane angle
14 Local beam dump Used for dumping the unscattered beam during 5T run Works good, The radiation is not very huge.
15 Summary New BPM and BCM receiver for low current Added slow raster,chicane,local beam dump, super harp etc for g2p BCM and tungsten calorimeter works stable Need to fix the harp noise BPMA works good, but BPMB is more noisy
16 Thanks! Thanks for Alexandre's help for beamline study Thanks for John Musson,Trent Allison, Keith Cole's help for BPM and BCM receiver's maintenance,optimize Thanks for Tony,Chad's hard work for harp Thanks for Arny, Ahamad's help for tungsten calorimeter Thanks for Bob,David Abbott,Ed Jastrzembski's help for happex DAQ improvement Thanks for Toby,Chao,Min,Jie,Ryan,Mellisa's help
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