The dawn of a new era

Beams! Beams! Beams!

The first results are in

• 16 bunch train– Qtot = 560 nC– Bbunch = 35 nC

• 32 bunch train– Qtot = 600 nC– Bbunch = 19 nC

Below are the results of our very first push to high Q

Now it is time to step back and consider what to do next

Low Q

4 lambda

8 lambda

16 lambda

lambda (32 bunches)

Raise the Q

Total = 352 nC11 nC per bunch

Total = 480 nC15 nC per bunch

Total = 160 nC5 nC per bunch

brainstorm: next steps• Systematically characterize the max Q for various trains

– Lengths: { 1, 2, 4, 8, 16, 32}– Charge: {100, 150, 250, 400, 560, 600}– Charges separated by 2*lambda, ??• Improve balance of train– Begin to make careful measurements of the trains– Compare laser intensity to charge of each bunch– Install the rest of the multisplitter flags– Finish upgrade of mutlisplitter hardware to make room for flags.– Measure and improve profile at virtual cathode (integrate light to get laser

intensity; • Finish design of and order beam imaging telescope.• Increase beam energy to 19 MeV

– Power accel cavity #1– Chiller cavity test #1 & #2– Single beam into gatevalve

brainstorm: next steps

• talk to bergoz, try filter, check max charge for ICT, 1000nC??• Calibrate the inflange ICT to an out flange ICY by installing an ICT

at the location of the YAG screen• Make a QE measurement (check 5 points)• Consider raising vacuum trip point to get above 500 nC

• Look at rf probe in gun for beam loading• Comprae probe and fct on fast scope

Action items (near term)

• Systematic measurements– Compare rf probe and fct

• (ch 2) Look at rf probe in gun for beam loading• (ch 3) Comprae probe and fct on fast scope

– Measure laser intensity photodiode; fix the iris– Add flags to multisplitter– Add laser profile camera at virtual cathode– Compare fct and laser intensity

• (ch2) Fast photodiode, ET-2000, for shot-by-shot laser intensity/beam charge comparison

• (ch3) FCT