Beam Text May 17 2012
Preparation
0. MATLAB emittance analysis: (working?) -- yes
1. Magnets: --Working
2. Camera: (a)--Working, (b)--shielding-good,(c) Sync? -- good
3. Flags: --Working
4. Farady Cup: hocked up? --yes
5. Blank off for camera on? --good
6. Gas bottle for valve full? --Yes
7. Gas bottle for flags full? --Yes
8. 3 Pickup Coils (Green Torroids): (1)@gun: hocked-up; (2)@accelerator exit: hocked-up to 2 red strip wire. Now connected to linac monitor panel which labeled as "J12 from back", "Scan field Mon" from front. (3)@end of beamline:
Start List
1) Valve exit of cavity opened?
2) Faraday cups are hocked up?
3) Target in?
4) Start the camera? Turn light on and off, observe if camera working. Load run script from "C:\Documents and Settings\sadiq\My Documents\26Apr2012\Camera_Settings".
Camera triggering issue
1. camera is triggered by something?
2. When camera trig is plugged into pulse generator, pulse generator set to trigger externally, but no external trigger connected to pulse generator, and Klystron HV is on, camera triggers.
3. Is camera being triggered by the noise created by the Klystron HV?
4. We have camera grounding issue.
can not bend the beam
Wrong polarity on the dipole. To switch the polarity on the dipole, we need turn on the power supply for the relays.
Energy Scan at 15 esh MeV
1. Tuning
| Energy Switch | Out (High En Range) |
| Dipole Coil Current | |
| e- Beam Energy () | MeV (mapping ) |
| Solenoid 1 | 12.9 A |
| Solenoid 2 | 13.7 A |
| Gun Hor | 0.1 A |
| Gun Ver | 0.2 A |
| Output Hor | -0.4 A |
| Output Ver | 0.0 A |
| Rep Rate | 63 |
| Gun HV | 8.97(Knob Setting) |
| Gun Grid Voltage | 10 (Knob Setting) |
| RF frequency | 2856.291 MHz |
| Modulator HV Power Supply | 4.84 (Knob Setting) |
| RF macro Pulse Length (FWHM) | 200 ns |
| Q1 (A) | 0 |
| Q2 (A) | 0 |
| Q3 (A) | 0 |
| Q4 (A) | 0 |
| Q5 (A) | 0 |
| Q6 (A) | 0 |
| Peak Current on FC 1 (45 deg) | 114 mAmps 400 px |
| Peak Current on FC 2 (45 deg) | mAmps |
| Scope on FC 1 | 200 px |
| Scope on FC 2 | 200 px |
| Beam Spot |
En Scan
Dipole FC En Coil Current Current Reading (A) (mA) (MeV) 27 1.264 13.5305 28 1.596 13.9129 29 2.336 14.2850 30 3.7 14.6469 30.5 4.18 14.8240 31 4.7 14.9985 31.5 7.26 15.1704 32 8.56 15.3398
Gaussian Fit for Electron Beam Energy:
Quad Scanning for Emittance
En Scan at 15.6004336 MeV. Q1 is on, All other quads are off. 88.8 mAmp Peak Current.
1) Scan from -10 Amps to 10 Amps
2) Increment at 0.4 Amps.
3) Name images by numbers start from 1. Then go on.
Like: -10 Amp is 1, -9.6 Amp is 2, and so on til 10 Amp is named 51.
4) Scan multipole (10) times from -10 to 10 Amps, and put them in different folders.
5) For each time, take back ground images. It should be done when RF is on and gun is off.
6) After the scan take a scope image for the current of the FC after the OTR screen.
Scan with Q1
After scan, put the files Run "Emit_Calc_N10toP10_Q1" under "C:\Documents and Settings\sadiq\My Documents\MATLAB\Emit_Calc\15MeV\Q1" directory.
Scan with Q6
After scan, put the files Run "Emit_Calc_N10toP10_Q6" under "C:\Documents and Settings\sadiq\My Documents\MATLAB\Emit_Calc\15MeV\Q1" directory.
Dipole Scanning for Energy Measurement
Energy Scan at Low Energy 8 MeV esh
1. Tuning
Energy switch is in, linac operates at low energy
| Energy Switch | In (Low En Range) |
| Dipole Coil Current | |
| nominal e- Beam Energy () | MeV (mapping ) |
| Solenoid 1 | 12.1 A |
| Solenoid 2 | 9.6 A |
| Gun Hor | + 0.3 A |
| Gun Ver | 0 A |
| Output Hor | + 0.6 A |
| Output Ver | + 0.3 A |
| Rep Rate | 63 |
| Gun HV | 8.99(Knob Setting) |
| Gun Grid Voltage | 10 (Knob Setting) |
| RF frequency | 2856.388 MHz |
| Modulator HV Power Supply | 4.185 (Knob Setting) |
| RF macro Pulse Length (FWHM) | 200 ns |
| Q1 (A) | 0 |
| Q2 (A) | 0 |
| Q3 (A) | 0 |
| Q4 (A) | 0 |
| Q5 (A) | 0 |
| Q6 (A) | 0 |
| Scope on FC 1 | 99.2 mA 200 px |
| Scope on FC 2 | 200 px |
| Beam Spot |
Energy Scan
Dipole FC En Coil Current Current Reading (A) (mA) (MeV) 12 1.712 6.5610 12.5 3.344 6.8305 13 6.72 7.0975 13.5 9.44 7.3620 14 20 7.6238 14.5 33.12 7.8831 15 33.6 8.1399 15.3 28.64 8.2927 15.5 24.56 8.3940 15.7 20.88 8.4950 16 16.4 8.6456 16.2 12.48 8.7455 16.5 9.36 8.8946 16.7 6.48 8.9935 17 3.94 9.1411 17.3 1.968 9.2877 17.5 1.368 9.3849 17.8 0.936 9.5300 18 0.648 9.6262 19 0.332 10.1012 20 0.332 10.5658
Amplitude = 32.53163, mean = 8.06509, sigma = 0.49500
Gaussian Fit for Electron Beam Energy: En = 32.53163exp(-(En-8.06509)^2) / (2*0.49500^2)
Gaussian Energy peak = 8.06509
Energy spread = 2.97002 rms Energy spread = 0.49500
Relative Energy spread = 0.36826 Relative rms Energy spread = 0.06138
Quad Scanning for Emittance
En Scan at 15.6004336 MeV. Q1 is on, All other quads are off. 88.8 mAmp Peak Current.
1) Scan from -10 Amps to 10 Amps
2) Increment at 0.4 Amps.
3) Name images by numbers start from 1. Then go on.
Like: -10 Amp is 1, -9.6 Amp is 2, and so on til 10 Amp is named 51.
4) Scan multipole (10) times from -10 to 10 Amps, and put them in different folders.
5) For each time, take back ground images. It should be done when RF is on and gun is off.
6) After the scan take a scope image for the current of the FC after the OTR screen.
Dipole Scanning for Energy Measurement
Energy Scan at Low Energy 3 MeV esh
1. Tuning
Energy switch is in, linac operates at low energy
| Energy Switch | In (Low En Range) |
| Dipole Coil Current | |
| nominal e- Beam Energy () | 3 MeV (mapping ) |
| Solenoid 1 | 7.0 A |
| Solenoid 2 | 4.1 A |
| Gun Hor | 0.0 A |
| Gun Ver | 0.0 A |
| Output Hor | -0.1 A |
| Output Ver | -0.1 A |
| Rep Rate | 63 |
| Gun HV | 8.99(Knob Setting) |
| Gun Grid Voltage | 10 (Knob Setting) |
| RF frequency | 2856.284 MHz |
| Modulator HV Power Supply | 3.85 (Knob Setting) |
| RF macro Pulse Length (FWHM) | 200 ns |
| Q1 (A) | 0 |
| Q2 (A) | 0 |
| Q3 (A) | 0 |
| Q4 (A) | 0 |
| Q5 (A) | 0 |
| Q6 (A) | 0 |
| Scope on FC 1 | 34.2 mA 200 px |
| Scope on FC 2 | 200 px |
| Beam Spot | 200 px |
Energy Scan
Dipole FC En Coil Current Current Reading (A) (mA) (MeV) 4 0.592 1.8985 4.5 0.86 2.2091 5 1.54 2.5172 5.5 2.4 2.8228 6 3.7 3.1257 6.5 4.82 3.4261 7 5.94 3.7240 7.5 6.54 4.0192 8 6.84 4.3119 8.5 6.1 4.6021 9 4.9 4.8896 9.5 2.76 5.1746 10 1.48 5.4570 10.5 0.296 5.7369
Energy Scan at Low Energy 12 MeV esh
1. Tuning
Energy switch is out, linac operates at high energy range.
| Energy Switch | Out(High En Range) |
| Dipole Coil Current | |
| nominal e- Beam Energy () | 12 MeV (mapping ) |
| Solenoid 1 | 6.9 A |
| Solenoid 2 | 5.2 A |
| Gun Hor | 0.1 A |
| Gun Ver | 0.0 A |
| Output Hor | -0.2 A |
| Output Ver | 0.5 A |
| Rep Rate | 63 |
| Gun HV | 8.99(Knob Setting) |
| Gun Grid Voltage | 10 (Knob Setting) |
| RF frequency | 2856.262 MHz |
| Modulator HV Power Supply | 4.24 (Knob Setting) |
| RF macro Pulse Length (FWHM) | 200 ns |
| Q1 (A) | 0 |
| Q2 (A) | 0 |
| Q3 (A) | 0 |
| Q4 (A) | 0 |
| Q5 (A) | 0 |
| Q6 (A) | 0 |
| Scope on FC 1 | 67.2 mA 200 px |
| Scope on FC 2 | 200 px |
| Beam Spot |
Energy Scan
Dipole FC En Coil Current Current Reading (A) (mA) (MeV) 8 0.5 4.3119 9 0.6 4.8896 10 0.67 5.4570 11 0.716 6.0141 12 0.752 6.5610 13 0.828 7.0975 14 0.896 7.6238 15 1.112 8.1399 16 1.328 8.6456 17 1.624 9.1411 18 1.896 9.6262 19 2.448 10.1012 20 3.36 10.5658 21 4.82 11.0201 22 6.58 11.4642 22.2 7.88 11.5518 22.5 9.24 11.6824 22.7 10.0 11.7690 23 10.2 11.8980 23.1 11.2 11.9408 23.2 11.56 11.9836 23.3 13.04 12.0262 23.5 13.2 12.1111 23.8 13.04 12.2377 24 13.48 12.3216 24.2 12.36 11.9836 24.5 11.24 12.5295 24.7 10.2 12.6119 25 10.28 12.7348 25.1 8.6 12.7756 25.2 6.92 12.8162 25.5 6.2 12.9376 25.7 4.84 13.0180 26 3.64 13.1378 26.5 1.82 13.3354 27 1.28 13.5305 28 0.56 13.9129 29 0.364 14.2850 30 0.364 14.6469