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* Mamun's analysis of SS small shield processed w/ Kr at CEBAF [[media:200108_Mamun

[[media:Mamun's summary sheet of hydrogen outgassing rate measurements for 1020 steel sam

* Jai/Mamun - Photocathode plans this Fall * Marcy or Mamun - Jobs when venting Prep chamber

==(Marcy/Mamun) Run 1 target thickness==

:: Mamun

Eric and Mamun have been studying TiN-coated aluminum

:: Mamun

* Mamun's analysis of SS small shield processed w/ Kr at CEBAF [[media:200108_Mamun

: Mamun:

* Beamline - no bake of beamline: (Mamun and Bubba) * Prep Chamber: (Mamun)- '''''Completed''''' [https://logbooks.jlab.org/entry/3869663]

#Mamun

* Beamline - no bake of beamline: (Mamun and Bubba) * Prep Chamber: (Mamun)- '''''Completed''''' [https://logbooks.jlab.org/entry/3869663]

*Create a summary of Mamun's experiments: settings, experimental conditions for trapping the beam, etc

*Create a summary of Mamun's experiments: settings, experimental conditions for trapping the beam, etc

Mamun: Add Jean Delayen

* Sajini's and Mamun's and Riad's magnetized beams - peer review * Mamun TE011 cavity & vacuum work

#Mamun

* Beamline - no bake of beamline: (Mamun and Bubba) * Prep Chamber: (Mamun)- '''''Completed''''' [https://logbooks.jlab.org/entry/3869663]

[[media:depo chamber designed by Russ and used by Mamun with stalks.pdf]]

* Beamline - no bake of beamline: (Mamun and Bubba) * Prep Chamber: (Mamun)

Attendees : Carlos, Mamun, Marcy, Riad, Joe * Mamun - develop plans to modify the 1137 and UITF depo chambers to test and final

* Sajini's and Mamun's and Riad's magnetized beams - peer review

** Mamun – Talk, Title: Progress of generating magnetized electron beam for electr

; Mamun - TE011 cavity

** Mamun and Yan successfully demonstrated that the heat-puck engagement mechanism w ** A spring with 5 leaves was made by the machine shop. Mamun found out that the height of the bend was too much, so he 'flattened' it b

* Mamun

*Created series of GPT simulations using Mamun's 1mA run back in mid august (8/16/18 and 8/17/18)

* Update on the R&D in GTS (Gabriel) and TL1137 (Mamun, Marcy), * JLAB/SLAC/KEK e-/e+ R&D proposal (Andriy, Carlos, Joe, Mamun, Reza, Silviu) [[media:US-Japan-Topics.pptx]]

# Report by Mamun on UITF status & lifetime

* Yan and Mamun are sharpening their emittance measuring skills - now, we define emittance * Yan and Mamun have been measuring QE versus Gun HV: 50, 100, 200, 300 kV - see GTS logboo

* Status of UITF (Mamun, Shukui)

* Mamun - working mostly with Cornell, develop activation at JLab

...on production rates and dynamics for the magnetic mirror theory concerning Mamun's observation of a post-run "beam" - could this be due to trapped ions?

** Mamun – Talk, Title: Progress of generating magnetized electron beam for electr

* Mamun and Yan are working on the cathode prep chamber, removing viewports for cle ** Mamun has an idea for holding the puck with the top heater, this would allow for

*Performing beam diagnostics on Mamun's "ghost" beam:

** Deposition chamber (Mamun) 2) Magnetized beam from dc high voltage photogun (POCs, Riad and Mamun)

* Mamun and Yan re-activated the photocathode increasing the QE from 0.2% to over 8 * And here is an update on the work by Mamun and Chio on the liquid nitrogen called multi-alkali cathode work!

** Mamun – Talk, Title: Progress of generating magnetized electron beam for electr

* Mamun has the improved put retainer which he and Yan plan to install today.

# Mamun/Marcy - status of sibling target thickness measurements

*Performing beam diagnostics on Mamun's "ghost" beam:

...ulator), Silviu/Shukui (laser fatigue), Andriy/Eric (irradiation fatigue), Mamun (material analysis)

* Sajini's and Mamun's and Riad's magnetized beams - out for peer review

* Mamun and Chio have made a 12% multi-alkali in Nb substrate

** Next step ... plan for un HV Processing (Mamun, Gabriel)

...ame ones used to grab th puck inside the ball electrode. With this scheme, Mamun and Yan demonstrated the puck is firmly grabbed and pulled towards the heat

...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun) ...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun)

**Mamun and Yan have completed the cathode prep chamber refurbishing assembly!. ** The improved chamber has Mamun's idea for top heater puck holder which allows biasing the puck and changin

**The two garage manipulators are installed, as is the Cs-K effusion source. Mamun loaded the K and Cs ampules. **The Sb boat manipulator is installed but needs to be loaded by Mamun.

1. Target thickness - Mamun completed various measurements of the Run 1 siblings. Marcy has been analy

*Mamun made the first multi-alkali photocathode in the GTS!...just not on the puck

* '''April 8, Publication''' => Md Abdullah A. Mamun, Abdelmageed A. Elmustafa, Rhys Taus, Eric Forman and Matthew Poelker, "''T

* Magnetized Beam Test Stand - Mamun/Riad * (20+10) M. Mamun (JLab) - TE011 Magnetometer Cavity Studies at the GTS

...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun)

...control room to monitor photocurrent. The only thing we need to bring form Mamun's depo chamber is the battery box chassis and the computer (including its

** Mamun Defended his PhD thesis last week! ** Mamun has moved the following items form the prep chamber in the vacuum lab to th

...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun)

** Mamun is studying the square samples with the AFM, EDS, etc.

'''[[Md Al Mamun]]'''

[[Media:FE-SEM_first_results.pdf]]==(Mamun/Marcy) Update on target thickness measurements==

...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun)

** This cathode is being heat cleaned and will be activated again. Mamun has a better scheme for masking the alkalies.

*(Matt???, or Mamun) Add load lock to depo chamber *(Mamun, what's the plan??) Modify depo chamber to include new chemical sources

2. Mamun is working on setting up the chamber for making a cathode, doing puck heat

:: Mamun found Russ' Sb req : https://misportal.jlab.org/reqs/pr/viewPrPo.do?prNum=3 : Align floppy mask to puck on heater, fix mask (comments: Marcy and Mamun looked at the mask assembly, the two screws that hold the mask on the rod a

;Mamun

...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun)

# The prep chamber top heater has been lengthened, as well as the mask rod. Mamun and Yan are testing the beryllium-copper leaf spring received as a free sam

...iel Palacios-Serrano, Steve Covert, Marcy Stutzman, Andriy Ushakov, Md. Al Mamun, Shukui Zhang. Not pictured Carlos Hernandez-Garcia and Jessica Carucci. (

*8/16/18 11pm Mamun ended a 1mA electron beam that ran for 9 hours. Gun HV: 200kV, Gun Solenoid ...ghost beam was visible on all three viewers and had a very high intensity. Mamun lowered the gun solenoid current to zero and then returned it to its origin

**Apr - Wrap up vacuum work + CsSbO2 lifetime (Mamun/Max)

** Mamun has made a cathode, this time on the puck!

* Mamun - 25% RSR, 75% R&D

...ramp down - test UCSB/RIT samples @ UITF? (Phil, Marcy, Jessica, Carlos, Mamun)

* Mamun

...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun)

* 2. We have move forward the photocathode R&D led by Mamun from the test deposition chamber to the gun producing actual electron beam. * 4. Mamun and Yan were able to re-activate the photocathode from 0.1% QE to 8% QE jus

* Mamun and Yan have made great progress with the photocathode preparation chamber'

# Mamun at 3 o'clock: [[media:Emittance_GunHV_3468399.xlsx]] [https://logbooks/entr

...ysics for Photoinjectors, SLAC, November 10-12, 2021 (Marcy, Carlos, Riad, Mamun)

* Measure the thickness of companion foils, our x-axis error bar (Mamun finished with measurements, Marcy completing analysis)

;M. L. Stutzman and Md. A. Mamun "Mott Target Ladder Gold Foil Thickness Measurements" JLab-TN-16-049

...that oxide form just needs higher temperature to evaporate. At this point Mamun thinks we need a bake for the vacuum to improve and reduce the presence of

* M. Mamun, "Reaching Lower Pressure in Photoguns" [[media:JLAAC2023_Reaching Lower Pr * Md. A. Mamun, S.A.K. Wijethunga, R. Suleiman, C. Hernandez-Garcia, B. Bullard, J. R. Del

* '''March 2016''' M.A. Mamun

:* (pending) - DOE ECA - PES with 1000x better vacuum (Mamun)

...K. Sinclair, M. Poelker, X. Roca-Maza, M. L. Stutzman, R. Suleiman, Md. A. Mamun, M. McHugh, D. Moser, J. Hansknecht, B. Moffit, and T. J. Gay, "High precis ;(FINAL) M. L. Stutzman and Md. A. Mamun "Mott Target Ladder Gold Foil Thickness Measurements" JLAB-TN-16-049

* M.A. Mamun, S.A.K. Wijethunga, R. Suleiman, C. Hernandez-Garcia, B. Bullard, J. R. Del <!--* M.A. Mamun, J. Guo, B.F. Roberts, R. Suleiman, H. Wang, M. Poelker, G. Park, J. Henry,

; Mamun - develop plans to modify the 1137 and UITF depo chambers to test and final

* ARC (Mamun)

** Mamun has been working on the Nb:CsK2Sb cathode QE vs wavelength at various tempe

| Mamun | Bruker <br /> Mamun

* S.A.K. Wijethunga, M.A. Mamun, R. Suleiman, P. Adderley, B. Bullard, J. Benesch, J.R. Delayen, J. Grames, * S. A. K. Wijethunga, M. A. Mamun, R. Suleiman, C. Hernandez-Garcia, B. Bullard, J. R. Delayen, J. Grames, G.

...0_31_16]] Gun HV chamber under vacuum, Improved Cathode prep chamber with Mamun's puck holder design is under vacuum!