EEEMCal Beam Tests

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The EEEMCal group has seven weeks scheduled at JLab Hall D for Prototype Test Beam studies from 9/6-9/27 (~3 weeks) and 11/15-12/14 (~4 weeks). The schedule may slightly shift depending on start up and other groups' progress.

The full JLab beam schedule can be found here: A spreadsheet of all JLab Hall D planned prototype tests can be found here: Link. The present order of JLab Hall D prototype beam tests is:

  • Period 1 (~8 weeks):
  • Period 2 (~7.5 weeks):
  • EEEMCal2 (+ GEMTRD/MPGD pending further discussions)
  • EEEMCal3/TPEX 5x5

The calorimeter tests planned for the Hall D test beam program include tests of the performance and operation of the prototype calorimeter with different active material and readout configurations:

  • PWO+SiPM
  • SiPM readout tests: Resolution: two (or four) SiPMs covering crystal surface and treated as separate channels using the existing preamplifiers for each channel; alternative: could match SiPMs with similar properties and assembly in a unit powered by a single bias and read out with single channel - check for significant decrease in performance
  • Dynamic range optimization
  • PWO+SiPM+Streaming readout
  • Glass scintillator

These tests will be carried out with 1x1, 3x3, and 5x5 PWO crystal/glass prototypes. The hardware for the tests is on site and assembled - the PWO+SiPM prototype from Crytur would be shipped to arrive before the program starts. The readout method will be standard GlueX. The detailed specifications of the planned tests can be found in the spreadsheet.

The tests would commence with initial setup, alignment, and commissioning, and then investigate calorimeter resolutions, etc. The resolution will be measured for several energies in the (2-6) GeV range and its dependence on mechanical assemblies/frames in front of the calorimeter (GEMs, TRD detectors, etc.) will be evaluated. The installation and alignment of the calorimeter requires at least one expert present (V. Berdnikov or A. Somov) and collaboration with HallD technicians and engineering personnel. The commissioning of the detector will be done with the experts present as well. Opportunities exist for collaborators to contribute to the commissioning, and in particular the data analysis that could in principle also be done offsite.

Jefferson Lab is currently in MedCon4 status. Please see the instructions below.

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See the following link for information on the training and health questionnaire required before arrival.

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The TPEX group tentatively has two weeks scheduled at the DESY Test Beam Facility from 15 November until 28 November, 2021. This is not final as yet and some changes may still occur. The final schedule will be posted at:

Assuming we are allowed to travel to Germany in November and that the requirements for working at DESY are not too restrictive; I am planning to send a 5x5 lead tungstate calorimeter with PMT readout for testing sometime in September. With the calorimeter we will also ship the following:

  • VME 64X crate,
  • CAEN V792AE QDCs,
  • CAEN V1725C Digitizers,
  • LeCroy 1458 HV mainframe with 1461N HV pods,
  • a NIM crate with some NIM electronics,
  • CAEN DT5810D signal generator,
  • two Dell computers for DAQ and laptop to help in setup,
  • Tektronix TDS 2052 oscillascope,
  • HV and signal cables,
  • Fisher Scientific chiller capable of reaching -25 C, and
  • miscellaneous supplies and tools.

Jan Bernauer and Ethan Cline will come to MIT sometime during the summer to setup and test the DAQ system before we ship everything.

The plan for this test beam period is to test the performance and operation of the 5x5 lead tungstate calorimeter in an electron test beam with various readout schemes in parallel (QDC, Digitizer, WaveBoard? other?). After initial setup and commissioning we can gain match the PMT signals and then investigate the calorimeter resolution and shower development as a function of incident beam energy (2, 3, 4, and 5 GeV), incident beam position and beam angle, and temperature. Various absorbers can be placed in front of the calorimeter also.

If high-density scintillating glass of comparable size are available these could be exchanged for some lead tungstate crystals.

The DESY test Beam facility is very well equipped and organized, see:

Each test beam area has trigger scintillators and tracking detectors with the necessary electronics to integrate with the user test equipment. Collimators of various sizes can be placed where the beam exits the shielding wall. Remotely controlled translation tables are available and a laser alignment system can be used to help position and align user detectors. Cameras are in all areas as well as water and pressurized air.

We are tentatively in test beam area TB24. This area has a dedicated counting room with some equipment HV supplies, NIM crates, patch panels (HV, signal, and fibre) to the experimental area, etc. The beam energy is selected by a magnet control computer in the counting room.

Following is very important:

Before anyone is allowed to enter the test beam hall (Hall II) you must register with the DESY Indico system. Access to the Indico system is by invitation after you and your group are approved for the test beam. I will send a list of the people planning to work at the test beam to the test beam coordinators and they will use this to create the Indico site and subsequently invite you to register. If you would like to be on this list please let me know. Registering on Indico must be done at least a week before the test beam time preferably sooner. You must also attend, in person, a 1 hour safety and procedure lecture, see the following for an overview of the material:

The lecture is held Mondays at 13:00 in building 1 room 310. After the lecture you may get a DACHS card that allows to to enter the hall. The DACHS cards are available in Building 6 room 110.

Douglas Hasell will be the designated safety / coordinator for this test beam period so please contact me if there are any problems.

The DACHS cards are also used to control the interlock to the test beam area. While everyone in the group can get a DACHS card to access the hall and counting room; only a few authorized people in each group will be able to control the interlock system. This means that a group “expert” must be present to open and secure the test beam area.

It would be extremely useful to have six (6) people including 2-3 experts present for the first week to help with the unpacking, setup, and commissioning. Assuming the tests are running smoothly four (4) people are likely sufficient including 2 experts. I think four (4) people are necessary to disassemble and pack everything on the last day. Typically one person can run the experiment but two are required in the evenings and to access the test beam area.

To get to DESY see:

I suggest flying to Hamburg and then taking a taxi to DESY. All the taxi drivers know DESY. Ask for the Notkestrasse entrance.

DESY has a very nice and convenient hostel see:

You need to reserve a room in advance. NOTE it can fill up quickly since the price is just 33 euro per night. For registration purposes you can list the DESY Test Beam as the group you are working with. You pick up your key at the gatehouse at the Notkestrasse entrance to DESY after 14:00. If you want to pick up your key before 14:00 on the day you arrive please book your room for arriving the day before. Please pay for your accommodation at the DESY bank before you leave.

There are hotels and other options for accommodation nearby.

There is a bank, ATMs, cafeterias, vending machines, coffee shop, and a licensed bistro on site. There are also numerous restaurants near to DESY. Various shops including the EEZ shopping mall are within a short walk. Hamburg has an excellent public transportation system with buses and subways to take you further afield. In general you do not need a car in Hamburg (except Jan of course). So if things are going well and you have some free time there are several things to do and see in Hamburg.

Good WiFi is available everywhere at DESY and you can get online quite easily using eduroam. An ethernet connection is a bit more complicated.