1. Carbon-Foil for reducing first strike issues
Z. Insepov and H. Wang
2/1/2011 LAPD working group

2. Use of C-foil – ion, high energy particles,
van de Graaff accelerator terminals, carbon foils with areal density nominally 2mg/sq.cm are often used.
Diamond foils for this purpose were described by Liechtenstein et al. (1995, 1997, 1998), and M. Ivkova et al. (1995)
Space physics, imaging of space plasmas, where nominally 0.5mg/sq.cm C foils are typically used. Detect time-of-flight (TOF) ion mass, energetic neutral atom, and energetic particles.
McComas et al. (2004)
Formvar foil (7%hydrogen, 56% carbon, and 37% oxygen) was used for Coulomb-explosion experiments, detection of recoiling nuclei; heavy ions, when traversing a thin foil within the detector, produce secondary electrons, (ANL, Physics)
C-foil bolometer (liq He temp.)
TEM experiment – C-foil 5 nm thick, 1 mg/cm2, (electrons can go through)

3. Transmittance in UV and Visible
C-foil 27 nm thick
- evaporated
For extreme UV
Detector
47% T at visible
41% T at 200 nm
1% T at 100 nm
Appl Optics 1965
200 nm
100 nm

4. First strike issues Electrons From Photocathode
For biased MCP channels, photoelectrons hitting at slightly different positions may create some timing issues such as jittering, noise,..
For unbiased channels, in addition to the timing issue, photoelectrons may go through the channel directly.

5. Glass MCP + ALD coated SEM layer + NiCr electrode + C-foil
Glass_MCP with 8o bias angle
Z. is working on incident angle, energy, simulation with 1KeV electron
MCP with C-foil

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7. ACF-Metals Carbon, arc evaporated, e-beam evaporated,
C-foil on mica nm thick, 2 mg/cm2 and up
C-foil over TEM grid nm thick
Polycrystalline graphite, mm thick, ,000 mg/cm2
Another possible enhancement is to coat C-foil with a thin UNCD diamond layer to enhance the SEM property