Status of Polarimeter GEMs

(a.k.a UVa GEMs)

K. Gnanvo, D. Di, S.Jian, N. Liyanage, H. Nguyen, R. de Silva

SBS Collaboration Meeting

07/23/2018

Outline

▪ Status of the Production

▪ New clean room” space for UVa GEMs

▪ Preparation for GMn/GEn Experiments

Front Tracker layer

INFN

(Rome, Catania)

Stack of 3

GEM

mo

du

les (40

×5

0 cm

2)

Back Tracker layer

(UVa)

Stack of 4

GEM

mo

du

les

(60

×5

0 cm

2)

Hadron arm in GEp(5)

▪ Front Tracker (FT): Track of the recoil protons

⇨ 1st tracker: 6 GEM layers, active area of 150 × 40 cm2

⇨ Layer: vertical stack of 3 GEM modules (50 × 40 cm2)

⇨ Production: 18 modules (+3 spares)

▪ Back Tracker (BT): Polarimetry of the recoil protons

⇨ 2nd & 3rd Trackers: 2×5 layers, active area 200 × 60 cm2

⇨ Layer: vertical stack of 4 GEM modules (60 × 50 cm2)

⇨ Production: 40 modules (+ 8 spares)

SBS Coll. Meeting @ JLab

Overview of SBS GEM Trackers Modules

7/23/2018 2

▪ GMn & GEn ⇨ 4 INFN GEM layers, 1 UVa GEM layer

▪ GEn-RP ⇨ 6 INFN GEM layers, 11 UVa GEM layers

▪ Gep (5) ⇨ 6 INFN GEM layers, 10 UVa GEM layers

SBS Coll. Meeting @ JLab

Status of UVa GEM Modules Production @ Uva

(Huong Nguyen)

7/23/2018 3

▪ 48 modules have been built so far

⇨All of the 48 modules been tested

⇨37 already moved to JLab

⇨were all tested once again just before shipping

⇨ Issues with 3 modules, under investigation

▪ Additional spare module #49 and #50

⇨Bonus modules are modules we spare GEM foils and readout

foils that initially failed our QA tests

⇨Module 49 clean room part completed

⇨Module 50 assembly will start soon after we got a support

G10 plate produced at the UVa machine shop

Back Tracker modules @ UVa

SBS Coll. Meeting @ JLab

UVa GEMs @ JLab

7/23/2018 4

Assembly of first

UVa GEM Layer

Space allocated to

6’x10’ cosmic stand

33 modules in store

DAQ Racks

▪ New Space for UVa GEMs:

⇨ 20’ × 20’ space in EEL Clean Room 124

⇨ Will host the storage of the GEM modules as well as the Cosmic

stand for the commissioning of the UVa GEM layers

⇨ First UVa GEM layer assembly is done

⇨ Overall available space is tight but should be OK

⇨ Will keep Ar-CO2 gas bottle outside in room 125

▪ 37 UVa GEM modules currently @ JLab

⇨ 33 in storage shelves (moved from TestLab to EEL Clean room)

⇨ 4 assembled into the first UVa GEM layer (chamber)

⇨ 8 more to be moved to JLab in a the next few weeks

SBS Coll. Meeting @ JLab

Assembly of First UVa GEM layer (Chamber)(Siyu Jian)

7/23/2018 5

▪ Complete assembly of the first layer

⇨ Full cabling of the HDMIs, (digital and analog MPDs, and LV)

⇨ HV cables and Gas tubing not yet connected

▪ HDMI Cables Layout

⇨ : Backplane→PatchPanels→Connector panel or HDMI adapter

⇨ Concerns about the mechanical constraints applied to some

HDMI cables (red circle below)

⇨ We are looking into it

▪ Connector panel or direct one-to-one connection:

⇨ Cable Hub for HDMI, HV, Low voltage, gas etc

⇨ Allow to decouple the GEM layer from long cables

Close view on the HDMI cable trails

SBS Coll. Meeting @ JLab

Setup of MPD & DAQ for UVa GEM layer(Siyu & Danning)

7/23/2018 6

▪ The MPD VME and NIM crate setup in place

⇨ Full cabling of the HDMIs

⇨ Electronic rack to be moved inside the rack next week

▪ UVa setup will have the SSP implementation

⇨ Currently under test by Siyu and Danning

⇨ Some issues with the initialization but looks like not big deal

⇨ (fixed last night)

⇨ Start looking at pedestal data of the chambers

SBS Coll. Meeting @ JLab

Design of Cosmic Tests Stand(Ryan de Silva)

7/23/2018 7

▪ Basic concept of the ongoing design of the cosmic test stand

⇨ Main Cosmic stand: For the commissioning of the UVa layers

⇨ Will ultimately accommodate up to 10 UVa GEM layers

⇨ Additional lightweight on-wheel installation stand

⇨ to help install layer on main stand

▪ Based on Unistrut / or Aluminum 80/20 hardware

⇨ Optimize cost/simplicity/robustness of the structure

⇨ Once finalized, will be submitted to JLab safety people for validation

Main Cosmic Stand

Main Cosmic Stand On-wheel Installation Stand

Strut Channel Trolleys

1, CPU/Thread informations2, Canvas display

SBS Coll. Meeting @ JLab

SBS GEM Commissioning: Software Development(Siyu Jian)

7/23/2018 8

Current data process procedure:

• MPD Decoder

• Parse GEM data from the raw data block

• Calculate Common mode, common mode subtraction

• Calculate Pedestal

• Zero subtraction( sigma cut on the strips)

• crosstalk check( nearby channels, ratio)

• re-order APV channels according to map

• Save as root file

• GEM Analysis

• Cluster searching, cluster matching

• detector analysis

• Hit distribution

• Cluster distribution

• cluster ADC, cluster size distribution

• Charge share ratio

• hit time distribution

• etc…

Choose Event / Set event limitation

Raw data, Pedestal file input dialog

GUI Version analyzer

Status bar(Work statuts)

SBS Coll. Meeting @ JLab

Preparation for GMn, GEn, GEn-RP

7/23/2018 9

SBS Coll. Meeting @ JLab

GEM Layout for GMn, GEn

7/23/2018 10

1 UVa GEM layer: Behind GRINCH detector4 modules

Main GEM Tracker : 4 INFN FT layers, 12 modules

GEM holding frame

Shielding hut of BigBite

GEM Electronics

We are preparing the first UVa GEM

layer but we would need a clear

timescale for when it is expected to

be installed in BigBite frame

SBS Coll. Meeting @ JLab

GEM Layout for Gen-RP

7/23/2018 11

GEM layers in the Electron arm

⇨ Same as for GEn configuration

GEM layers in the Hadron Arm

▪ The Charge-Exchange (CE) Polarimeter.

⇨ 2 planes of INFN GEM layers, on a common

subframe to the central frame

⇨ 2 planes of UVa GEM layers, on a common

subframe to the central frame.

⇨ A Cu analyzer block.

⇨ 4 planes of UVa GEM layers, on a common

subframe to the central frame

▪ Total = 6 UVa GEM layers & 2 INFN GEM layers

▪ The Proton-Recoil (PR) Polarimeter:

⇨ 2 Identical arms, each has 2 UVa GEM layers, on a

common subframe to the PR arm frame,

▪ Total = 4 UVa GEM layers We would soon need to talk to the engineer / designer for the

design and location of the shielding hut of the GEM

Electronics in Hadron arms for both GEn-RP and GEp(5)

SBS Coll. Meeting @ JLab

GEM Readout & DAQ Electronics Layout for GMn & GEn-RP

7/23/2018 12

▪ JLab custom device to distribute the clock & trigger to the MPD from the SSP instead of the Phillips 757 modules to save money

▪ Statements yesterday that these modules have 16 inputs, we would need 20 inputs according to this scheme

SBS Coll. Meeting @ JLab7/23/2018 13

Hardware needed

⇨ 77 UVa MPDs: (We have 58) + 24 INFN MPDs

⇨ 32 MPD / SSP = 3 SSP ( or more ? )

⇨ 77 +24 MPD / 16 = 6 VME crates: All at hand

⇨ 6 old VME CPU: All at hand

⇨ 1 VXS crate (UVA) ,1 Intel CPU (DVCS), 1 SD , 1 SSP, 1 TI

⇨ 3 VME64X crates available 3 CPUs ( Intel CPU DVCS ) and 3 TI ( 3 from ECAL )

⇨ Optical fiber: (1 Fiber per MPD)

⇨ One SFP to QSFP for each 4 MPDs ( ~ 8 on hands need 25 )

⇨ HDMI Cables:

Hardware we still need to buy for the readout

GEM Readout & DAQ Electronics Layout for GMn & GEn-RP

JLAB Custom Hardware

SBS Coll. Meeting @ JLab7/23/2018 14

Pre-Experiment Installation and Commissioning

Plans & MilestonesGoals:

⇨ Assemble 11 large area GEM tracker layers in the EEL Clean Room

⇨ Evaluate the assembled GEM layers for noise levels, efficiency and resolution using cosmic.

⇨ Develop and test diagnostic scripts to be used in GEM tracker commissioning.

⇨ Develop, implement and test hardware level background suppression algorithms.

Milestones:

⇨ 11/2018: Complete the assembly and testing of the first large area GEM layer (LT1).

⇨ 12/2018: Complete the implementation of hardware background suppression scheme. Demonstrate the proper working

of this using at high rate trigger and background conditions using x-ray data.

⇨ 12/2018: Complete diagnostic scripts; produce diagnostic results for LT1, as well as for INFN layers j0, j1, j2 and j3.

⇨ 12/2019: Complete the assembly and testing of 11 Uva GEM layers. It is expected that after the first layer, each

subsequent layer will take approximately 1 month. Testing of the layers with cosmic will be carried out simultaneously.

Manpower Resources:

⇨ Kondo Gnanvo and Nilanga Liyanage will continue to work with UVa graduate students, Danning Di and Siyu Jian, on

the installation and commissioning of UVa GEM trackers and to participate in the testing of the INFN GEM trackers.

⇨ We have a SBS-GMn-GEMs weekly meeting every Tuesday Morning @ 9:00 am with the wiki page below

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

⇨ UVa group will be requesting funds for a post-doc to be stationed at JLab to work on the GEM trackers starting 06/2019.

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