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namespace:ga_notebook [2026/01/07 17:27] – [01/05-07/2026] adminnamespace:ga_notebook [2026/04/17 15:57] (current) – [04/16/2026] admin
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-======2025 Notebook=====+======2026 Notebook===== 
 +====04/16/2026====
  
-=====01/05-07/2026===== +===Trying to why the 20ns sweep window for the streak camera has the weird effect===
-over the break oscillator was working but didn't mode lock when we got back. we walked the 2 cavity mirrors and the stepper motors to get a small mode lock. we ultimately Set the Stepper Motors to Default, Greased the slit motor threads. and did very small adjustment to the horiztonial knob of the M7 mirror. it became way more consistent now.+
  
-The slit motor travel is about 23mm or 87k counts.+100ns Sweep window, at 760,350,000ps delay:\\ 
 +Tab 'Ramp': Advanced shows TR:0 0 150 , SP:0 0 200
  
-the configuration for the MIT Users are 800nm at 40mJ after the Amp, with 0.8mm diameter beam, and 300ps pulses. +20ns Sweep window, at 760,500,000ps delay:\\ 
 +Tab 'Ramp': Advanced shows TR:0 0 75 , SP:0 0 200
  
-Damage threshold is Energy/ Area.   and Power is Energy/PulseTime+5ns Sweep window, at 760,713,000ps delay:\\ 
 +Tab 'Ramp': Advanced shows TR:0 0 0 , SP:0 0 0
  
-Our laser rating for damage is 0.0795J/cm^2. per pulse +200ns Sweep window,\\ 
-====12/04/2025====+Tab 'Ramp': Advanced shows TR:0 2 0 , SP:0 0 200
  
-the 6inch telescope lens worked well, should make a acronym for it. +1us Sweep window,\\ 
 +Tab 'Ramp': Advanced shows TR:0 9 0 , SP:0 4 0
  
-learned how to create a 3 plot for the dazzler run+5us Sweep window,\\ 
 +Tab 'Ramp': Advanced shows TR:0 26 0 , SP:0 4 0 
 +====03/31/2026==== 
 +Update for all the stuff that happened last week and yesterday.
  
 +For the Students and their imaging:
 +  * after some struggle to understand the magnified diffraction rings. we choose to image larger pin holes(200um, 100um, back to 50um)
 +  * we found at larger pinholes, we could determine the edges better, and gain a better frame of reference as we move back to the 50um pinhole
 +  * we found the focus of the 50um pinholes, and then place in a 3mm tube. 
 +  * with a lot of alignment, we got the exiting light at the focus and could see the diffraction and the size of the whole
  
-WE want to use a different scintallator (BaF2), that makes 218nm light then 308nm. need a fiber and bandpass filter. We might use either the spectrometer or the streak camera.  
-====11/3/2025==== 
  
-the Modelock is looking good. we ran Austin's 5D simulations. Gil fixed the target flipper SMA port.  
  
-some steps to update the sizzler/dazzler+Inlite Laser Update: 
 +  * Gil swapped the laser head, and found it didn't have the doubling crystal.  
 +  * What we thought was the doubler was just a filter for the 532nm light. 
 +  * On Friday we used the laptop software to adjust the Eff , but to no avail. 
 +  * on Monday(yesterday), Chris help Gil found out the doubler was missing a Waveplate so we were actually changing any polarization  
 +  * Placing this WP in, 532nm spiked. 
 +  * Gil placed the laser onto the mounts and start the alignment through the AMP 
 +  * we found that the laptop will Hard Code certain value, like if Trigger is EXT or INT 
 +  * that needs to change with the laptop before plugging to the computer. 
 +  * Also, the Pointing Vector of the laser onto the Regen Crystal changes the wavelength effect, So resetting the Mazzler(Cuts off wavelength) will help.  
 +  * When it come to the Delays. The Pockel Delay is the Q-Switch Delay. And we don't adjust that 
 +  * we only should adjust the Flash Delay(near 545500ns) 
 +  * We adjust 1 mirror for the Inlite laser alignment and 1 WP 
 +  * we adjust 1 mirror for the Stretched Oscillator beam 
 +  *  
 +====03/10/2026==== 
 +Gil got in early, and ran a Q3xQ1 runs with thick acrylic. 
  
-===Pulse width optimization wizzler/ dazzle loop===+im trying the same runs, but with 3.5mm step size. First set with 4mm Teflon(550keV Stopping) then 6mm teflon(700keV stopping).
  
-- [ ] Place mirror in magnetic mount for wizzler\\ 
-- [ ] Open wizzler and check pulse  reconstruction and spectral intensity/phase\\ 
-- [ ] Check if good(fwhm 25fs or lower, with 12  sigma), if not proceed\\ 
-- [ ] In dazzler computer \\ 
-- [ ] File, reload default , press load button\\ 
-- [ ] Physically adjust the wizzler aperture, filters\\ 
-- [ ] In dazzler, click out of phase both, then click back , than press reload.\\ 
-- [ ] In Wizzler computer, set feedback strength to 0.8 , then press feedback now.\\ 
-- [ ] Repeat last 2 steps until optimal\\ 
-- [ ]  
  
 +====03/06/2026====
 +I ran simulations on the different quadrupoles configurations.On my personal laptop Jupyter. We physically test Quad1 with 2,1, then 3 magnets per pole, then Quad1 with 3 and Quad2 with 1 magnet. Look for the times started to know when each starts. as well as the image to know when the Quads are Flipped up or down.
  
-**Saving Files**+we used the Teledyne_3 (Off Brem)
  
-Mikan Oscillator:  
-  * file 
-  * datalogging 
-  * Ok 
  
  
-{{:namespace:img_8692.jpeg?400|}} 
  
 +Q3xQ1: BG:295103, Strt:295104, End:295823\\
 +Q3xQ0: BG:294262, Strt:294263, End:295102\\
 +Q1xQ0: BG:293421, Strt:293422, End:294261\\
 +Q2xQ0: BG:292307, Strt:292308, End:293420\\
 +====02/23-28/2026====
 +THÉODEN = Tapered Housing Extraction Of Diverging EmissioN
  
-Wizzler: 
  
-{{:namespace:img_8693.jpeg?400|}}+Found the Equation the relates the focal length to the a magnetic field strength and energy of the electron
  
 +When approximating for the thin Len ray equation, you miss a factor of 1/2, where you you would have caught it if you did Busch’s theorem. Which accounts for the rotation the electron will do, which then you take the average of the movement in both the xy-plane.(adding the 1/2)
  
 +f_Busch’s theorem = 2*f_thin lens
 +====02/16-20/2026====
  
-====10/31/2025==== +  * we removed the MIT Users EXP. Put back the Espec and Gas Jet Nozzle.  
-Found out that the little hump on the modelock causes a sawtooth pattern on the pulse train, on the oscilloscope. We want a flat line. Gil adjusted the P2, slit, M7, OC to get to as close to 80nm with a flat pattern. We moved to alignment of the dazzler(stretcher), then tweaked the amplifier, then the compressor. +  * The Inlite Laser head dropped in power, so I did a Flush of the cooling system.  
 +  * Laser head should be 260mJ of 532nm, but we were getting 200mJ 
 +  * The last  block on the laser head in the doubler( 1064 to 532), alignment will effect energy 
 +  * plug grey usb to laptop and open GUI, go to Service User, Pswd: **1064532** 
 +  * We discuss putting in a permanent Magnetics to focus the E beam. Should get f~1.5cm to 29cm for 100keV to 1MeV 
 +  * Check the Alignment of the ESpec on Friday. We Put in a small stripe of Eljen EJ-262, and a large strip of Eljen EJ-212. Saw the electrons
  
-We found our beam on the objective image in the chamber, and did a focal depth run. 
  
-{{:namespace:img_8556.jpeg?400|}} 
  
-{{:namespace:img_8554.jpeg?400|}}+{{:namespace:img_0657.jpeg?400|}}
  
-{{:namespace:img_8553.jpeg?400|}}+{{:namespace:img_0656.jpeg?400|}}
  
 +{{:namespace:img_0655.jpeg?400|}}
  
-====10/30/2025====+{{:namespace:img_0658.jpeg?400|}} 
 +====01/12-30/2026==== 
 +===MIT USERS=== 
 +Yun Kai came to the lab. We got the short pulse and long pulse to meet at TCC. We use Frodo's green laser and another green diode laser to align the beams, plus send the light to Frodo's Basler and the Streak Camera.  The short pulse is very sensitive, since the travel distance is so much longer. 
  
-found a new default 40nm mode lock, such that you only us the software. Figured out that if this whole relalginment of the laser happens again you will only need to open the box, place the apertures on, and use M7 and OC to get lasing then mode lock. We had made too many adjustments to things that didn't need to be touch.+We were able to get an image of the both pulses, on our cameras, by inserting a Microscope slide at TCC to reflect the short pulse.
  
 +Notes for warming up:
 +  * the max Flash lamp Voltage is 1205V, we have been aligning with 1135V or 1160V
 +  * Before you open the AMP shutter. Set the Flash lamp to 1205 and turn on the NF and FF Beam Stabs. Then  turn them off -> set the flash lamp to 1135 -> Open AMP shutter -> Attenuator.
  
-**Default 40nm:**\\ 
-Prism POS: 320,000\\ 
-Slit POS:82,000 
  
-Signs where you are getting close to mode locking+Notes for next time: 
 +  * We should delay the short pulse after the compressor, so that align through the compressor is maintained 
 +  * Use the andor camera, or more power for probe beam to see the shadow. 
 +  * 
  
-{{:namespace:img_8546.jpeg?400|}} 
  
-Best 80nm we got, by move the prism inward then slit, then prism , then slit...+====01/05-07/2026==== 
 +over the break oscillator was working but didn't mode lock when we got back. we walked the 2 cavity mirrors and the stepper motors to get a small mode lock. we ultimately Set the Stepper Motors to Default, Greased the slit motor threads. and did very small adjustment to the horiztonial knob of the M7 mirror. it became way more consistent now.
  
-{{:namespace:img_8544.jpeg?400|}}+The slit motor travel is about 23mm or 87k counts.
  
-{{:namespace:img_8543.jpeg?400|}}+the configuration for the MIT Users are 800nm at 40mJ after the Amp, with 0.8mm diameter beam, and 300ps pulses. 
  
-====10/29/2025==== +Damage threshold is Energy/ Area.   and Power is Energy/PulseTime
-We got a mode lock, the best was 67nm, but ended the day with 40nm. You physical bumped P2 is your finger  to get it started. the best position for P2 is when the light hits the tip of it and then you slowly move it forward, to increase the bandwidth+
  
-made slight adjustments to the Lens, M2, and Ti Saph translation.Lens and Ti Sap made larger improvements to the power and litte to the bandwidth. While M2 was the opposite, but it was super sensitive. Your shouldn't need to adjust any of these in the future. +Our laser rating for damage is 0.0795J/cm^2. per pulse
- +
- +
-====10/28/2025==== +
- +
-Got the oscillator back. we touched the 2 prisms translations, and just recentered all the beam on each of the apertures.The main thing the helped was the Photodiode after the OC, so that we could see the Voltage. Without the apertures, we coarsely got the 6V and fine walked the OC(mainly) and M7 to get ~12V. The 12V  would changed between 12.1 and 12.38V but that did not directly correlate to the 1mW to 310mW power range seen on the Laser's power meter. +
- +
-You can block the m7 to stop the amplification. We use a thorlab's DET100A2 photodiode. The TUNING Widget on the software allows you to adjust the the step motors for he Prism2 and slit +
-====10/27/2025==== +
-Few terms that could be helpful to the oscillator: +
-  * Spatial Hole Burning(in 240A Lec12): +
-  * Kerr effect: when the gaussian light sees a nonlinear effect on a medium refractive index. n=n0+I*n1 depending on how instill the beam is. this lead to mode locking and KLM +
- +
-====10/24/2025==== +
-I have the Mikan Oscillator manual. tried fixing the oscillator, but not dice. tried alignment of M7 and CO mirrors, placed in apertures, adjusted the lens and mirror just before the TiSaph. We checked thing off a list but haven't found the solution. +
-====10/23/2025==== +
-finished the image tubing +
- +
-Had issue with the the oscillator. Thing to try tomorrow. Start from step 24 or 28, use a red diode for  +
-backwards alignment. +
- +
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- +
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-====10/22/2025==== +
-Changed the tube for the imaging. Had to narrow it to fit the vacuum flange +
- +
- +
-{{:namespace:img_8347.jpeg?400|}} +
-====10/21/2025==== +
-Worked on Galadriel Manual +
- +
-I made an account on Papeeria, just in case I go over the timeout of Overleaf. +
- +
-====10/20/2025==== +
- +
-the laser power, out of the main shutter was a little low ~22mJ. Gil tried to power it up by changing how to pump enters the  TiSaphh crystal, as shown in the image. +
- +
-{{:namespace:img_8331.jpeg?400|}} +
- +
-I worked on getting cost estimates for a chiller camera setup up. The pump will be expensive. +
- +
-We went into a clean room, so that we can get a acturate calibration of our quad filter. We got image, ref, and dark images at 40keV,80keV, and 160keV. +
- +
-I learned of a FIGI images software the  reads all types of images and you can do math with them. +
- +
-Lastly, I built the cone for the 6inch imaging setup and spoke with Gil regarding the cover for after the 6in lens  +
-====10/16/2025==== +
-Yesterday we ran into imaging issue with the E-Spec. The possibilities could be Alignment, Triggering, and/or Software Timing. Turns out it was Alignment. The E-Spec has a 3D print part to it, and wasn't in place. Gil found this be using a laser to align it, and no light was coming out. +
- +
-I moved to getting a better imaging system, so that the Teledyne Cameras(E-Spec) could be outside the chamber. We are using a Diameter=6inch f~300mm lens to capture the light from a Scintillator(that will be 1" from the nozzle) and send it outside the window. I tested with a Plano-Convex 175mm lens(won't work, too long) and an Achromatic 30mm lens(should work). The nozzle is about 55mm away from the window, or 52mm from the Scintillator. This puts the 2nd lens 3.5 inches away from the window +
-====10/15/2025==== +
- +
-When I got in Gil was trouble some imaging issues. He started with the BNC Digital Delay Trigger, where started by simply turning it Off and back On again. He did notice the EXT Trigger wasn't On, but we don't know if it was like that before(This did not solve the issue).  +
- +
-He went to adjust the HV CH3 knob, but before that he Turned Off both NF/FF Beam Stabs. While adjusting that knob, he looked at the number of peaks on the Teltronix TD's screen.(This did not solve the issue) +
- +
-We moved to the Main laser. Yesterday, while moving mirrors for the delay stage, we bumped An actuator that controls the last OAP of the main laser. Which I helped fix. +
- +
-===Focusing Main Laser onto the Objective lens=== +
-  - set the laser to 0.5% emission  +
-  - close shutters +
-  - place 2 ND filters in front of the big shutter +
-  - open shutters +
-  - open the Pylon Viewer for the Basler Camera +
-  - move the stage, with the objective lens and Basler Camera down, until you see the laser +
- +
-the laser should be like the image below, circular and pretty good intensity. Youre looking for a 7um FWHM. If its not like the image, move to  alignment +
- +
-**ALIGNMENT** +
-  - Using the 4 THorlabs motor to control the 4 knobs +
-  - Adjust vertical with vertical. and Horizontal with horizontal  +
-  - M2 vertical is very sensitive, so get a feel for it with very small steps +
-  - take a picture of the motor distances, as a reference  +
- +
-{{:namespace:img_8293.jpeg?400|}} +
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- +
-====10/01-14/2025====+
  
-  * Watched videos 
-  * took eye exam and laser safety training 
-  * Learned more of the GALADRIEL Experiment 
-  * Responsible for make a Galadriel cite on Sharepoint, Operations Manual, Chilling the teledyne cameras, and A mount for multiple fiber ends  
-  * Aligned the Delay Stage 
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