For the FLASH Collaboration by Taiwan CosPA Members W-Y.Pauchy Hwang, Guey-Lin Lin, Ming-Heuy Huang, Chien-Wen Chen, Feng-Yin Chang, Chih-Ching Chen, Yu-Chung Chen, Staff Member :Maggie Wang The Design of Beam Profile Monitor and the test at SRRC Chien-Wen Chen

PC2 WINDOWS XP (LAPTOP) CAMERA PC1 WINDOWS XP (WORKSTATION) SLAC TRIGGER SYSTEM TUNNELCONTROL ROOM LAN CAMERA CONTROL, IMAGE DOWNLOAD, DATA ANALYSE MONITORING, REMOTE CONTROL TRANSFER DATA OF & POSITION TITANIUM FOIL DESIGN OF BEAM PROFILE MONITOR ELECTRON BEAM

total 64cm object distance 35cm 29cm Trigger circuit tube lens CCDIEEE 1394 titanic foil beam pipe six way cube beam axis

16cm

7cm (inner) 8cm (outer) screw holes 1.3cm

2 ft optical table Cable tray/Wall 6 inch beam pipe e- 25 inches (wall-to-wall) ~ 63.5 cm OTR “cube” 28 inches (wall-to-beam-axis) Top view – not to scale Beam line flange.

Pixels1360x 1036 Well size10000 e Pixel size4.65x 4.65 Digital output 8/12 Bit Readout noise 9 e Dark current1.3/pix/s Cooling25C below ambient Integration time Ambient operating temperature 0 to 35C

ROI Full Frame Spot 3x3 binning

OTR efficiency transmission efficiency quantum efficiency pixels readout noise dark current distribution# of electrons OTR efficiency and angular distribution of a single electron for a metal foil:

The Algorithm Integrating over one axis 200

centerσ 10^ ^ In SLAC 30GeV 10^8 e/bunch Maximum intensity can be analysed :1.05x10^9 e/bunch Signals per Pixel Plotted by Feng-Yin pixel photoelectron

maxσ 10^ ^ In SLAC 30GeV 10^8 e/bunch Signal (Integrating over One Axis) photoelectron pixel

maxσ 10^795 10^ photoelectron pixel Center(93) In SLAC 30GeV 10^8 e/bunch Signal to Noise Ratio per Pixel

centerσ 10^ ^ In SLAC 30GeV 10^8 e/bunch photoelectron pixel Signal to Noise Ratio (Integrating over One Axis)

triggerexposurereadoutdownload the image analysetransfer download the analysed data 360GB / 80KB = 4.5x10^6 (events)

BPM

aluminum coating mirror beam pipe stainless window

Data captured in SRRC Signals = photoelectrons σ x ＝ 1.22 mm 1.5 GeV photoelectron pixel

Theoretical calculation in SRRC 1.5 GeV e/bunch Total photoelectrons = photoelectron pixel σ x ＝ 1.22 mm

Experimental : photoelectrons Theoretical : photoelectrons photoelectron (one metal surface) (two metal surface) / = Factors which may had made the difference: twice OTR, instability of the current, interference of the twice OTR.

Conclusions 1.We have captured and downloaded the image of OTR at SRRC. 2.The S/N ratio seems to be big enough, so that we may sacrifice some of it to increase the MAX intensity of events which can be analysed. 3. The code to analyse and transfer data is yet to be accomplished.