Status of UVA GEM setup in EEL clean room

SBS Weekly Meeting, October 10, 2019

Kondo Gnanvo

Weekly meeting for the commissioning of the GEMs every Wednesday at 10:00 am

Wiki: https://hallaweb.jlab.org/wiki/index.php/GMn_GEM_Commissioning_Meeting

UVa: Nilanga, Kondo, Anuruddha, John

HU: Michael, Malinga, Thir

JLab: Bogdan, Chuck, Alex, Bryan, Ole, Brad

And many more ....

04/25/2019

Assemblu of UVa GEM layers

Layer #5 on assembly table

Storage ShelvesSetup for Individual modules test

SBS weekly Meeting 2

04/25/2019

UVa GEM Cosmic setup in EEL124

Bottom trigger layer: 4 scintillators

(~ 15 cm × 200 cm each)

Layer #4

Layer #3

Layer #2

Layer #1

Top trigger layer: 2 scintillators

(~ 25 cm × 150 cm each)

⇨ 4 GEM layers installed and operating on

the cosmic stand

⇨ Each layers made of 4 GEM modules

⇨ 16 modules on the cosmic stand

⇨ Trigger signal:

⇨ coincidence between top and bottom

layers of scint / PMTs

⇨ covers most of the GEM active area

⇨ Tremendous help from Bogdan (Thanks)

⇨ Gas distribute to the GEM

⇨ 2 bottle (outside in EEL 125) at the time

⇨ 10 flow meters ⇨ one for 2 GEM layers

Gas distribution panel

SBS weekly Meeting 3

04/25/2019

UVa GEM Cosmic setup in EEL124

Different views:

Cables arrangement for HDMI

cables from the APV25 to MPD

modules

SBS weekly Meeting 4

Side view

Back view

Top view

04/25/2019

2 Racks for the Electronics, HV PS and Trigger

MPD DAQ & GEM HV PS

⇨ 2 standard VME crates for the MPD electronics

⇨ reading out 14 MPDs each

⇨ Configured to read the first 4 layers in cosmic stand

⇨ Trigger signal distribution (JLab custom module)

⇨ Wiener HV power supply crates for the GEM

⇨ 3 HV modules with 8 channels each

⇨ Enough for 5 layers in the cosmic stand + test of the

layer on assembly table

MPD DAQ & Trigger Rack

⇨ 1 standard VME crates for MPD electronicss

⇨ reading out the 5th layer & test the layer on assembly

table

⇨ 1 VXS crate

⇨ Will be use when we transfer to SSP readout mode

⇨ Bryan and Ben currently working on this

⇨ 1 LeCroy PS crate for the trigger scintillators

⇨ NIM crate for the trigger coincidence logic

MPD DAQ & Trigger RackMPD DAQ & GEM HV Power Supply

SBS weekly Meeting 5

04/25/2019

GEM HV Wiener Crate

Wiener crate with 3 HV modules

⇨ Currently control with the standalone software

⇨ Will have to migrate the control into EPICs to be able to better

monitor the current and voltage with time

⇨ Working in a very stable way so far

⇨ 16 GEM on the stand powered by 2 modules

⇨ The 3rd modules for the 5 layer and the layer on assembly table

8 modules of layer #3 and layer #4 @ 4.2 V ⇨ current ~763

SBS weekly Meeting 6

Monitoring display of the GEM layers on HV

Wiener crate with 3 modules 8 channels each

04/25/2019

DAQ PC, Online Monitoring and Analysis Software

New DAQ PC

⇨ We just acquire a new powerful PC for the DAQ and online monitoring of data from the cosmic setup

⇨ Ole, Brad and Bryan have been very helpful installing CODA and the related tools and configuring the PC

⇨ Have enough disc space for the huge amount of cosmic data we will collect with 5 layers

⇨ John Matter will be responsible for the data management of this PC as well as permanent save of the data

Online Monitoring Tool for GEM cosmic data

⇨ John is also working on the upgrade of the existing standalone decoder software (from Siyu) for basic online monitoring

⇨ Will incorporate some additional script recently developed by Andrew to complete the online monitoring

Analysis of the cosmic data

⇨ Andrew has agreed to help us with the analysis of the cosmic data

⇨ This is primary to study track based efficiency as well as spatial resolution performances of the GEM layers with the cosmic

data

⇨ We (John mainly) will be responsible to provide the decoded APV25 data in for of hits as input to Andrew analysis

⇨ We expect to have the first data from the 4 layers currently in the cosmic stand ready for Andrew in the coming weeks

SBS weekly Meeting 7

Layer #2

Layer #3

04/25/2019

Preliminary Cosmic data with first two layers

▪ All 4 layers @ 4050 V on ArCO2 so technically

▪ First round of cosmic with layer #2 & #3 1.5 M triggers event in 1.5 days

▪ Preliminary hit map plots below for the 8 modules of layer #2 & #3

▪ All modules are working very well, no dead sector

▪ Few dead area on two modules that are mostly APV25 issues

▪ We are looking through this

▪ Low efficiency in GEM 0 of layer 2 is due to known issue with the chamber GEM

module #13 ⇨ need to operate at higher A few of our GEM modules have similar

issues due to GEM foil holes parameters we got from CERN ⇨ Not really an issue

SBS weekly Meeting 8

04/25/2019

Cosmic data yesterday with the other layers

Layer #1

Layer #4

SBS weekly Meeting 9

▪ Second round of cosmic with layer #1 & #4 ⇨1. M triggers event in 1.5 days

▪ Very preliminary hit map plots below for the 8 modules (yesterday evening)

▪ All modules are working very well, no dead sector (Plots below are misleading)

▪ No data in module #2 of layer #1 ⇨ Issue with the 12-slots APV cards MPD module was

disabled during data taking

▪ We are looking through this

▪ 3 of 4 bottom plots show some large partial dead (low hit counts) area on the GEMs

▪ Not a problem on the GEM modules

▪ The 5-slots APV cards of these 3 modules all connected to the same MPD

▪ We suspect something wrong with this MPD ⇨ under investigation

▪ Probably a minor issue

APV25 readout

disabled for this

module