High Rate Tracking Test Beam Area

David Christian & Richard Coleman

Why us; why now?

• Many next-generation experiments will require trackers capable of operation in a very high flux of particles.– Intensity frontier experiments– HL-LHC pixels: 1-2 GHz/cm2

• All CERN accelerators will be shut down for more than one year starting in March 2013.

• R&D Review closeout:– “Fermilab is encouraged to further develop test beam

facilities and detector R&D for LHC experiment upgrades.”

Location – M03 (MT3)

MT3

MS3 service building

Upstream Meson Cactus Plot

Test Area

MTest running modes• MTest has three approved beam configurations:

– (low intensity) Proton mode:• Absorber in, quads off, pinhole in.• Probably not useful for most high rate testing.

– Pion mode:• 2E11/spill maximum in MT3 = 40 GHz in 5 sec spill.

– Absorber can be in or out; no restriction on quads.

• Typical spot size is about 1 inch diameter (rates above 2.5 GHz/cm2 are achievable).

• Minimum rate depends on constraints from other beam lines.– If SeaQuest is running 1E13 (hoped for), 2E9 in MT3 may be difficult (400 MHz ave; higher

instantaneous).

– Old Pion mode:• Absorber in.• Maximum beam energy = 66 GeV.• Low beam rate is easy.

Beam Rate in MT3

• Instantaneous intensity depends on spill structure and total amount of beam delivered.

• Spill structure:– Booster harmonic number = 84– Main Injector harmonic number = 7 × 84 = 588– A gap of at least 1 Booster batch (84) is left for abort.– Typically, max of 82 full buckets per Booster batch.– Max of 6 × 82 = 492 full rf buckets per MI turn.– SeaQuest (& in the future, ORKA) wants spill to be as uniform as

possible… great improvement expected, but duty factor > 50% is unlikely.• Duty factor = <I><I>/<I2>

What needs to be done?

• Remove the vacuum pipe between MT3Q1 & MT3Q2– Move SWIC to a position just downstream of MT3Q1.– Install new two new vacuum windows.– Install a remotely moveable table for DUT?– Pull optical fiber & cables to MS3?– Designate an area in MS3 for DAQ.– Establish the procedure for scheduling users &

providing the required training (MT3 is a primary beam enclosure).

Summary

• There is a need for a high rate tracking test facility.• CERN is developing such a facility, but the CERN

accelerators will be shut down for an extended period of time starting next spring.

• We can establish a test area in MT3 with the required properties with very little effort at a very low cost.– Many tests in the new area will be allow simultaneous

use of MTest by experiments in MT6.• We should start work very soon so that the high rate

tracking test facility is available next spring.