PM fused silica T Lig pip ht e

亮度监测器的原理和结构 PM 钨 fused silica T Lig pip ht e 钨转换体厚为 1. 2 cm。 熔融石英的几何尺寸为 4. 5 x 4. 0 x 6. 6 cm 3 surrounded by tungsten shield 5

相对亮度测量的精度 Fig. (a) Counting rate with colliding beams normalized by the current of e- and e+ bunches vs. the FEE threshold. Fig. (b) Counting rate with separated beams normalized by the current of e- and e+ bunches vs. the FEE threshold. According to Fig. (a) and (b) the ratio between the counting rates with separated beams and colliding beams are lower than 3. 5%. 6

相对亮度测量的精度 the counting rates and their errors due to different thresholds in SBBS (I+=5. 11 m. A, I-=5. 00 m. A） Thr. (m. V) 100 200 300 400 500 600 800 1000 1200 1400 25991 19946 16245 13535 11281 9226 6036 3305 1509 649 25992 19946 16245 13535 11281 9226 6036 3305 1509 649 161 141 127 116 106 96 78 57 39 25 857 575 420 306 250 192 120 58 17. 5 0 29 24 20 17 16 14 11 8 4 0 31775 24413 19914 16628 13853 11335 7414 4064 1866 811 204 179 161 147 134 121 98 72 49 25 0. 0081 0. 0092 0. 0102 0. 0111 0. 0121 0. 0134 0. 0166 0. 0222 0. 0326 0. 0081 According to the table above the error of relative luminosity with threshold of 400 m. V and the pair of bunches currents of 5× 5 m. A 2 is about 0. 9%. 7

利用亮度监测器对束团尺寸的测量 By steering the electron beam while observing the counting rate changes of the luminosity monitor, the horizontal and vertical sizes of the bunch spots can be estimated as shown in the figure. There are 70 e+ bunches and 10 e- bunches stored in the storage rings. The total e+ current is 321. 660 m. A, the total e- current is 54. 758 m. A. The data of the figure is of the fifth e+ and e- bunch pair. Fitted by gaussian function, the horizontal standard deviation σx=0. 50± 0. 01 mm, the vertical standard deviation is σy=0. 0146± 0. 0003 mm. , Supposing σe+ = σe- in both horizontal and vertical direction, then 11

利用亮度监测器对束团尺寸的测量 σx=0. 636 mm, σy=0. 015 mm which is close to the luminosity monitor resultσx=0. 50± 0. 01 mm, σy=0. 0146± 0. 0003 mm. 12