Emittance meter with CEM
2
Emittance meter with CEM Initially we had an Allison type emittance meter s - 100V SCANNER CURREN T ± V g L beam L = 70 mm g = 4 mm V = ± 1000 V (KEPCO) Limitations • Could not take a scan for beam currents below 1 nA • between 1-3 nA one had to use reverse bias to take a scan. Upgrade: CEM incorporation Two modes of operation • Channeltron: Low beam intensity~10pA • Faraday cup: Beam intensity > 1nA L = 50 mm g = 2mm V = ± 1000 V (KEPCO)
-
Upload
hu-alvarado -
Category
Documents
-
view
51 -
download
0
description
Emittance meter with CEM. Upgrade : CEM incorporation Two modes of operation Channeltron: Low beam intensity~10pA Faraday cup: Beam intensity > 1nA. Initially we had an Allison type emittance meter. -. 100V. ± V. beam. s. SCANNER. CURRENT. g. L = 70 mm g = 4 mm - PowerPoint PPT Presentation
Transcript of Emittance meter with CEM
Emittance meter with CEM
Initially we had an Allison type emittance meter
s
-100V
SCANNER CURRENT
± V
gL
beam
L = 70 mmg = 4 mmV = ± 1000 V (KEPCO)
Limitations• Could not take a scan for beam currents
below 1 nA• between 1-3 nA one had to use reverse
bias to take a scan.
Upgrade: CEM incorporation
Two modes of operation• Channeltron: Low beam intensity~10pA• Faraday cup: Beam intensity > 1nA
L = 50 mmg = 2mmV = ± 1000 V (KEPCO)
Emittance meter with CEM
Emittances at low intensities:
116Cd at 20 kV Intensity= 15 pA, Scalar time = 0.25 s
e = 3.86 mm mrad
225Ra at 20 kV Intensity=13000 cps, Scalar time= 2s
e = 4.2 mm mrad
